United States Air and Radiation EPA420-R-02-028
Environmental Protection October 2002
Agency
oEPA User's Guide to
MOBILE6.1 and
MOBILES.2: Mobile Source
Emission Factor Model
:;Note: This is a reference cited in ~AP 42, Compilation of Air Pollutant Emission Factors, Volume I Stationary Point and ';,
\Area Sources. AP42 is located on the EPA web site at www.epa.gov/ttn/chief/ap42/ I
:;The file name refers to the reference number, the AP42 chapter and section. The file name "ref02_c01s02.pdf" j
Printed on Recycled Paper
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EPA420-R-02-028
October 2002
to and
Assessment and Standards Division
Office of Transportation and Air Quality
U.S. Environmental Protection Agency
NOTICE
EPA is not responsible for the accuracy of any MOBILE6 files, diskettes, or tapes that were
received from sources other than EPA or for the accuracy of any MOBILE6 files, diskettes, or
tapes released prior to the release of the final MOBILE6 program. Further, EPA is not
responsible for the accuracy ofMOBILE6when modified by the user without consulting EPA.
Mention of specific products, product or corporate names, or trademarks in no way constitutes
endorsement of same by the U.S. Government or by the EPA.
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Abstract
This document is the MOBILE6.1 and MOBILE6.2 User's Guide. MOBILE6 is a
computer program that estimates hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen
(NOX), exhaust paniculate matter (which consists of several components), tire wear particulate
matter, brake wear particulate matter, sulfur dioxide (SO2), ammonia (NH3), six hazardous air
pollutant (HAP), and carbon dioxide (CO2) emission factors for gasoline-fueled and diesel
highway motor vehicles, and for certain specialized vehicles such as natural-gas-fueled or electric
vehicles that may replace them. The program uses the calculation procedures presented in
technical reports posted on EPA's MOBILE6 Web page http://www.epa.gov/otaq/models.htm.
While MOBILE6.0 is replaced earlier versions of MOBILE, this version does not supercede
MOBILE6.0 but adds capabilities to it.
The term "MOBILE6" is used in this guide to refer generically to any or all of its released
versions. MOBILE6 calculates emission factors for 28 individual vehicle types in low- and high-
altitude regions of the United States. MOBILE6 emission factor estimates depend on various
conditions, such as ambient temperatures, travel speeds, operating modes, fuel volatility, and
mileage accrual rates. Many of the variables affecting vehicle emissions can be specified by the
user. MOBILE6 will estimate emission factors for any calendar year between 1952 and 2050,
inclusive. Vehicles from the 25 most recent model years are considered to be in operation in each
calendar year.
This user's guide repeats the information available in the January 2002 final user's guide
for MOBILE6.0. For questions relating to the modeling of HC, CO, and NOx, it may be used as
a substitute for the 6.0 user's guide.
Document and Support Availability
The following MOBILE6 documents are available on the EPA Web site
http://www.epa.gov/otaq/models.htm.
A README.TXT file
A compiled, executable version of the program and associated files for DOS
Source code
This User's Guide
External data files used with the executable program
Example input and output files
Policy guidance on when MOBILE6 must be used for State Implementation Plans
(SIPs)
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A technical policy guidance document
A frequently asked questions (FAQ) document
Humidity calculation/conversion tools
Training and Presentation Materials
Technical reports explaining the data and calculation methods used in MOBILE6
Questions concerning MOBILE6 or this User's Guide should be directed to:
U.S. EPA National Vehicle and Fuel Emissions Laboratory
Office of Transportation and Air Quality, ASD
2000 Traverwood Drive
Ann Arbor, MI 48105
Attn: MOBILE6 Project
Fax: (734)214-4939
Email: mobile@epa.gov
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Table of Contents
CHAPTER 1
INTRODUCTION -9-
1.0 BACKGROUND -9-
1.1 USER'S GUIDE STRUCTURE -11-
1.2 MOBILE6 SCOPE -11-
1.2.1 MOBILE6 Input Parameters -12-
1.2.2 Adjustments to the Basic Emission Rates -12-
1.2.3 MOBILE6 Vehicle Classifications -14-
1.2.4 MOBILE6 Emission Type Classifications -15-
1.2.5 MOBILE6 Roadway Classifications -15-
1.2.6 MOBILE6 Pollutant Categories -16-
1.2.7 MOBILE6 Hydrocarbon Categories -16-
1.3 WHAT7 S NEW IN MOBILE 6.1 and 6.2 -16-
1.3.1 MOBILE6.1 -16-
1.3.2 MOBILE6.2 -18-
1.3.3 Simple Capability to Estimate CO2 -19-
Optional Input of Hourly Relative Humidity -20-
1.4 SOURCES FOR USER SUPPORT AND TRAINING -20-
1.5 COMMENTS ON MOBILE6 -21-
CHAPTER 2
MOBILE6 INPUTS -22-
2.0 INTRODUCTION -22-
2.1 OVERVIEW OF MOBILE6 COMMANDS -23-
2.2 RUNNING MOBILE6: MODEL INTERFACE -34-
2.3 HOW TO CREATE AN INPUT FILE -34-
2.4 INPUT STRUCTURE -35-
2.4.1 Command Input Files -35-
2.4.2 Batch Input Files -37-
2.5 COMMAND INPUT FILE CONTENT -38-
2.6 INPUT FORMAT -39-
2.6.1 Free Versus Fixed Format Data Entry -40-
2.6.2 How to Read Fortran Format Specifications -41-
2.6.3 COMMENTS -42-
2.7 EXTERNAL DATA FILES -42-
2.8 MOBILE6 COMMANDS -43-
2.8.1 Overview -43-
2.8.2 Separator Commands -44-
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2.8.2.1 First Record of a Regular Command Input File -44-
2.8.2.2 First Record of a Batch File -44-
2.8.2.3 End of Header Section -46-
2.8.2.4 Scenario Record -46-
2.8.2.5 End of Run -47-
2.8.3 Commands to Specify Pollutants and Emission Rates -47-
2.8.3.1 Specifying Which Pollutants are Reported -47-
2.8.3.2 Enable Calculation of Particulate Matter and Related
Pollutants -48-
2.8.3.3 Entry of Particulate Emission Factor Data -49-
2.8.3.4 Specify Upper Size Limit For Particulate Emissions . . -55-
2.8.3.5 Hydrocarbon (HC) Emissions Speciation -56-
2.8.3.6 No Refueling Emissions -58-
2.8.3.7 Enable Calculation of Primary Air Toxic Pollutants .. -58-
2.8.3.8 Input of Emission Factors for Additional (User-Defined)
Air Toxic Pollutants -60-
2.8.3.9 Entry of Vehicle Fuel Economy Data -63-
2.8.4 Descriptive and Spreadsheet Output Commands -65-
2.8.4.1 Descriptive Output -65-
2.8.4.2 Spreadsheet Output -69-
2.8.5 Database Output Commands -73-
2.8.5.1 Control of Output in Database Form -73-
2.8.5.2 Database Output Files Identification -85-
2.8.6. External Condition Commands -86-
2.8.6.1 Calendar Year of Evaluation -86-
2.8.6.2 Month of Evaluation (January or July) -86-
2.8.6.3 Daily Temperature Range -87-
2.8.6.4 Ambient Temperature for Each Hour of the Day -89-
2.8.6.5 Altitude -90-
2.8.6.6 Absolute Humidity -91-
2.8.6.7 Environmental Effects on Air Conditioning -91-
2.8.6.8 Ambient Relative Humidity for Each Hour of the Day -93-
2.8.6.9 Barometric Pressure -95-
2.8.7 Vehicle Fleet Characteristic Commands -96-
2.8.7.1 Distribution of Vehicle Registrations -96-
2.8.7.2 Diesel Fractions -98-
2.8.7.3 Annual Mileage Accumulation Rates -99-
2.8.7.4 Vehicle Miles Traveled (VMT) Fraction -100-
2.8.7.5 Natural Gas Vehicles (NGVs) Fraction -100-
2.8.7.6 Alternate Emission Factors for Natural Gas Vehicles
(NGVs) -101-
2.8.8 Activity Commands -103-
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2.8.8.1 Fractions of Vehicle Miles Traveled (VMT) -104-
2.8.8.2 VMT By Facility, Hour and Speed -105-
2.8.8.3 Starts Per Day -113-
2.8.8.4 Distribution of Vehicle Starts During the Day
-117-
2.8.8.5 Soak Distribution -118-
2.8.8.6 Hot Soak Activity -120-
2.8.8.7 Diurnal Soak Activity -121-
2.8.8.8 Weekday Trip Length Distribution -123-
2.8.8.9 Weekend Trip Length Distribution -125-
2.8.8.10 Use Weekend Vehicle Activity -127-
2.8.9 State Programs -127-
2.8.9.1 Effects of Fuel Program on Emissions -127-
2.8.9.2 Effects of Stage n on Refueling Emissions -127-
2.8.9.3 Anti-Tampering Programs -129-
2.8.9.4 Inspection/Maintenance (I/M) Programs -131-
2.8.10 Fuel Commands -148-
2.8.10.1 Fuel Program -149-
2.8.10.2 Sulfur Content of Gasoline -155-
2.8.10.3 Sulfur Content of Diesel Fuel -156-
2.8.10.4 Oxygenated Fuels Programs -157-
2.8.10.5 Fuel Reid Vapor Pressure (RVP) -159-
2.8.10.6 Effective Season for RFG Calculation -160-
2.8.10.7 Fuel Commands Used ONLY in the Air Toxic Emission
Calculations -161-
2.8.11 Alternative Emission Regulations and Control Measures -168-
2.8.11.1 Disablement of the 1990 Clean Air Act Requirements
-168-
2.8.11.2 Heavy-Duty Diesel Vehicle NOx Off-Cycle Emission
Effects -170-
2.8.11.3 Tier 2 Emission Standards and Fuel Requirements .. -174-
2.8.11.4 Alterative Schedule for 1994 and Later Model Year Light
Duty Gasoline Vehicle Standards -179-
2.8.11.5 2007 Heavy Duty Vehicle Emissions Reductions ... -181-
CHAPTER 3
MOBILE6 OUTPUTS -184-
3.0 INTRODUCTION -184-
3.1 DATABASE OUTPUT REPORT -184-
3.1.1 Database Output Formatting Options -185-
3.1.1.1 Key Fields -185-
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3.1.1.2 Echoed Fields Carried To Output From Input -187-
3.1.1.3 Calculated Fields -188-
3.1.2 Database Output Structure -189-
3.1.3 Restricting the Set of Database Output Records Produced -190-
3.2 DESCRIPTIVE OUTPUT -191-
3.2.1 Descriptive Output Formatting Options -193-
3.2.2 Explanation Of Additional Items in the Descriptive Output -195-
3.3 SPREADSHEET OUTPUT REPORT -197-
3.4 WARNING AND ERROR MESSAGES -197-
3.5 USER SCREEN OUTPUT -198-
CHAPTER 4
MOBILE6 INSTALLATION AND COMPUTER REQUIREMENTS -199-
4.0 INTRODUCTION -199-
4.1 GENERAL INFORMATION -199-
4.2 PROGRAM AVAILABILITY -199-
4.3 SYSTEM REQUIREMENTS -200-
4.4 INSTALLATION -201-
4.4.1 Basic Installation -201-
4.4.1.1 The RUN SubdirectoryThe Executable Program . . -202-
4.4.1.2 The Examples Subdirectory -203-
4.4.1.3 The UGUIDE Subdirectory -203-
4.4.1.4 The SOURCE Subdirectory -203-
4.4.2 Advanced Options -204-
4.5 RUNNING MOBILE6 -204-
4.5.1 Basic Run -205-
4.5.2 Input -206-
4.5.3 Output -207-
4.5.4 Batch Input -208-
4.5.5 Input and Output File Names -209-
4.5.6 Open Actions -211-
4.6 MOBILE6 SOURCE CODE -212-
4.7 USING MOBILE6 ON OTHER COMPUTER PLATFORMS -213-
CHAPTER 5
CONVERTING MOBILES INPUTS TO MOBILE6 -217-
5.0 INTRODUCTION -217-
5.1 BASIC CONVERSION -217-
5.2 FEATURES NO LONGER AVAILABLE -218-
5.3 CONVERTING USER-SUPPLIED DATA -219-
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5.3.1 Hour of the Day -220-
5.3.2 Vehicle Class -220-
5.3.3 Operating Modes -225-
5.3.4 Average Speed -229-
5.3.5 Roadway Type -234-
Appendix A
Alphabetical List of MOBILE6 Commands -235-
Appendix B
MOBILE6 Input Data Format Reference Tables -244-
Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs -249-
Appendix D
Vehicle Class Adjustment Factors -255-
Appendix E
MOBILE6 Default Diesel Sales Fractions -257-
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed -258-
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CHAPTER 1
INTRODUCTION
1.0 BACKGROUND
MOBILE6 is a software application program that provides estimates of current and future
emissions from highway motor vehicles. The latest in a series of MOBILE models dating back to
1978, MOBILE6 calculates average in-use fleet emission factors for:
Three criteria pollutants: hydrocarbons (HC); carbon monoxide (CO); and oxides of
nitrogen (NOX).
Gas, diesel, and natural-gas-fueled cars, trucks, buses, and motorcycles.
Calendar years between 1952 and 2050.
MOBILE6, the original version of MOBILE6, became available in January 2001. This
expanded version, called MOBILE6.1/6.2, adds the ability to estimate a number of exhaust
particulate and related pollutants, hazardous air pollutants (HAPs) and carbon dioxide (CO2).
MOBILE6.1/6.2 adds capabilities to MOBILE6.0. The term MOBILE6 is used in this manual to
refer to both versions.
MOBILE6 was designed by the U.S. Environmental Protection Agency (EPA) to address
a wide variety of air pollution modeling needs. Written in Fortran and compiled for use in the
desktop computer environment, the model calculates emission rates under various conditions
affecting in-use emission levels (e.g., ambient temperatures, average traffic speeds) as specified
by the modeler. MOBILE models have been used by EPA to evaluate highway mobile source
control strategies; by states and local and regional planning agencies to develop emission
inventories and control strategies for State Implementation Plans under the Clean Air Act; by
metropolitan planning organizations and state transportation departments for transportation
planning and conformity analysis; by academic and industry investigators conducting research;
and in developing environmental impact statements.
Each new version of MOBILE reflects the collection and analysis of new test data. It also
incorporates changes in vehicle, engine, and emission control system technologies; changes in
applicable regulations, emission standards, and test procedures; and improved understanding of
in-use emission levels and the factors that influence them. MOBILE6 represents the first major
update to EPA's emission factor model since the release of MOBILESb in 1996. This latest
version of MOBILE differs significantly in both structure and data requirements from previous
versions of the model. It incorporates updated information on basic emission rates, more realistic
driving patterns, separation of start and running emissions, improved correction factors, and
changing fleet composition. It also includes impacts of new regulations promulgated since
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MOBILESb and provides users with more sophisticated options for tailoring emission factor
estimates to specific times and geographic locations.
EPA has gone to great lengths to assure that MOBILE6 is based on the best data and
calculation methodologies available. EPA staff has produced more than 40 technical reports
explaining the data analysis behind the MOBILE6 estimates and the methods used in the model.
These were posted on the EPA's MOBILE6 website for comment and review. In addition, all
papers were extensively reviewed within EPA, and papers reporting major new data analyses
were sent to external experts for an independent peer review. All comments were considered, and
MOBILE6 methodologies were revised in response to comments as necessary.
The descriptive and spreadsheet outputs from MOBILE6 report emission rates in grams
or milligrams of pollutant per vehicle mile traveled (g/mi or mg/mi). Database output can be
reported as g/mi or grams per vehicle per unit time (day or hour). The change in emission rates
for a given vehicle category over time is due to fleet turnover, through which older vehicles built
to less stringent emission standards are replaced by newer vehicles built to comply with more
stringent standards. Emission rates from MOBILE can be combined with estimates of travel
activity (total vehicle miles traveled, or VMT), which also change over time, to develop highway
vehicle emission inventories expressed in terms of tons per hour, day, month, season, or year.
MOBILE6 allows users to calculate and report sub-components of total emissions for
some pollutants. For example, non-exhaust (often described as "evaporative") HC emissions
from gasoline-fueled vehicles include: diurnal emissions (emissions generated by the rise in
temperature during the course of a day when the vehicle is not being driven); hot soak emissions
(emissions occurring after the end of a vehicle trip, due to the heating of the fuel, fuel lines, and
fuel vapors); running losses (emissions occurring while a vehicle is driven, due to the heating of
the fuel and fuel lines); resting losses (small but continuous seepage and minor leakage of
gasoline vapor through faulty connections, permeable hoses, and other components of the fuel
system); and refueling emissions (vapors that escape into the atmosphere when incoming liquid
fuel displaces vapors in the vehicle fuel tank). Similarly, MOBILE6 can report emissions by
roadway type, time of day, vehicle category, and other characteristics that allow for very detailed
modeling of specific local situations.
Prior to MOBILE6.1, EPA developed a separate PART model to estimate particulate
matter and other related emissions. PARTS was the latest version of this model prior to
MOBILE6.1. MOBILE6.1 consolidates an upgraded version of PARTS with MOBLE6.0.
Prior to MOBILE6.2, EPA developed a separate draft model, called MOBTOX, which it
used to estimate the emissions of hazardous air pollutants. MOBTOX was very difficult to use
and was released only upon request. MOBILE6.2 consolidates the methods from MOBTOX with
MOBILE6.0
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MOBILE6.1/6.2 is EPA's first highway mobile source emissions model to include
estimates of CO2 emissions. These estimates are very simplistic.
This User's Guide outlines technical requirements for all functional areas of MOBILE6
and describes options for setting up and running the model. It will be of particular assistance to
users who wish to model local scenarios that differ from the "national average" conditions that
MOBILE6 defaults assume.
1.1 USER'S GUIDE STRUCTURE
The User's Guide is structured into five chapters, plus appendices. The first chapter is this
introduction. Chapter 2 describes how to use the model, outlines model input requirements, and
provides a description of each command, the required syntax, and tips for ease of use. Chapter 3
describes the output and the possible output formats. Chapter 4 describes how to install the
program on commonly used computers and describes the minimum computer hardware and
software requirements needed to execute MOBILE6, as well as other technical details. Chapter 5
outlines differences between MOBILE6 and the previous version of the model, MOBILES. The
appendices include an alphabetical list of all MOBILE6 commands and various reference tables.
Example input files are distributed with MOBILE6.
1.2 MOBILE6 SCOPE
MOBILE6 includes default values for a wide range of conditions that affect emissions.
These defaults are designed to represent "national average" input data values. Users who desire a
more precise estimate of local emissions can substitute information that more specifically reflects
local conditions. Use of local input data will be particularly common when the local emission
inventory is to be constructed from separate estimates of roadways, geographic areas, or times of
day, in which fleet or traffic conditions vary considerably. A list of MOBILE6 input parameters
is provided below. Most of these inputs are optional because the model will supply default values
unless alternate data are provided. At a minimum, users must provide input data for calendar
year, minimum and maximum daily temperature, and fuel volatility.
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1.2.1 MOBILE6 Input Parameters
Calendar year
Month (January, July)
Hourly Temperature
Altitude (high, low)
Weekend/weekday
Fuel characteristics (Reid vapor pressure, sulfur content, oxygenate content, etc.)
Humidity and solar load
Registration (age) distribution by vehicle class
Annual mileage accumulation by vehicle class
Diesel sales fractions by vehicle class and model year
Average speed distribution by hour and roadway
Distribution of vehicle miles traveled by roadway type
Engine starts per day by vehicle class and distribution by hour
Engine start soak time distribution by hour
Trip end distribution by hour
Average trip length distribution
Hot soak duration
Distribution of vehicle miles traveled by vehicle class
Full, partial, and multiple diurnal distribution by hour
Inspection and maintenance (I/M) program description
Anti-tampering inspection program description
Stage JJ refueling emissions inspection program description
Natural gas vehicle fractions
HC species output
Particle size cutoff
Emission factors for PM and HAPs
Output format specifications and selections
1.2.2 Adjustments to the Basic Emission Rates
MOBILE6 basic emission rates are derived from emissions tests conducted under
standard conditions such as temperature, fuel, and driving cycle. Emission rates further assume a
pattern of deterioration in emission performance over time, again based on results of
standardized emission tests. MOBILE6 calculates adjustments to basic emission rates for
conditions that differ from typical standard testing. Adjustments are used both to reflect how an
in-use vehicle population is different from the tested samples and for conditions different from
those used in the testing program.
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Adjustments are calculated for the effects of:
Average speed by roadway type
Temperature
Air conditioning
Humidity
Gasoline volatility
Gasoline oxygen content
Gasoline and diesel fuel sulfur content
Reformulated gasoline
Detergent gasoline rule
Other gasoline fuel properties (used to estimate HAPs only)
Cold CO rule
Off-cycle driving and Supplemental Federal Test Procedure (SFTP) rule
Tampering
Excess emissions (defeat device)
Inspection and maintenance programs
Anti-tampering programs
Stage II refueling control programs
Onboard diagnostics
Some adjustments do not affect all emission types or all emissions. Some adjustments, such as
inspection and maintenance (I/M) programs, require detailed user-supplied information and
complex calculation of the effect.
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1.2.3 MOBILE6 Vehicle Classifications
Number
I
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
MOBILE6 Vehicle Classifications
Abbreviation
LDGV
LDGT1
LDGT2
LDGT3
LDGT4
HDGV2b
HDGV3
HDGV4
HDGV5
HDGV6
HDGV7
HDGVSa
HDGVSb
LDDV
LDDT12
HDDV2b
HDDV3
HDDV4
HDDV5
HDDV6
HDDV7
HDDVSa
HDDVSb
MC
HDGB
HDDBT
HDDBS
LDDT34
Description
Light-Duty Gasoline Vehicles (Passenger Cars)
Light-Duty Gasoline Trucks 1 (0-6,000 Ibs. GVWR, 0-3,750 Ibs. LVW)
Light-Duty Gasoline Trucks 2 (0-6,000 Ibs. GVWR, 3,751-5,750 Ibs.
Light-Duty Gasoline Trucks 3 (6,001-8,500 Ibs. GVWR, 0-5,750 Ibs.
Light-Duty Gasoline Trucks 4 (6,001-8,500 Ibs. GVWR, greaterthanS,
LVW)
ALVW)
7511bs.ALVW)
Class 2b Heavy-Duty Gasoline Vehicles (8,501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Gasoline Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Gasoline Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Gasoline Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Gasoline Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Gasoline Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Gasoline Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Gasoline Vehicles (>60,000 Ibs. GVWR)
Light-Duty Diesel Vehicles (Passenger Cars)
Light-Duty Diesel Trucks land 2 (0-6,000 Ibs. GVWR)
Class 2b Heavy-Duty Diesel Vehicles (8,501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Diesel Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Diesel Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Diesel Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Diesel Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Diesel Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Diesel Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Diesel Vehicles (>60,000 Ibs. GVWR)
Motorcycles (Gasoline)
Gasoline Buses (School, Transit and Urban)
Diesel Transit and Urban Buses
Diesel School Buses
Light-Duty Diesel Trucks 3 and 4 (6,001-8,500 Ibs. GVWR)
Many of these individual classes are in pairs: a gasoline-fueled class, and a corresponding
diesel-fueled class.
These class divisions are not likely those used in local vehicle registration systems or in
reporting VMT data to the Federal Highway Administration's (FHWA) Highway Performance
Monitoring System (HPMS), so care must be taken when relating vehicle types across these data
sources.
MOBILE6 descriptive output can report results in terms of groups of the previous
individual vehicle classes, including emission rates for "all vehicles."
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1.2.4 MOBILE6 Emission Type Classifications
MOBILE6 Emission Type Classifications
Number
1
2
o
J
4
5
6
7
8
9
10
Abbreviation
Running
Start
Hot Soak
Diurnal
Resting
Run Loss
Crankcase
Refueling
Brake Wear
Tire Wear
Description
Exhaust Running Emissions
Exhaust Engine Start Emissions (trip start)
Evaporative Hot Soak Emissions (trip end)
Evaporative Diurnal Emissions (heat rise)
Evaporative Resting Loss Emissions (leaks and seepage)
Evaporative Running Loss Emissions
Evaporative Crankcase Emissions (blow-by)
Evaporative Refueling Emissions (fuel displacement and
spillage)
Paniculate matter from brake component wear
Paniculate matter from tire wear
Pollutants
All except
tire and brake
wear.
HC,CO,NOX
HC, BENZ,
MTBE
HC, BENZ ,
MTBE
HC, BENZ,
MTBE
HC, BENZ,
MTBE
HC, BENZ,
MTBE
HC, BENZ,
MTBE
Brake wear
paniculate
Tire wear
paniculate
Vehicle Classes
All
LD plus MC
Gas, inc. MC
Gas, inc. MC
Gas, inc. MC
Gas, less MC
Gas, inc. MC
Gas, less MC
All
All
1.2.5 MOBILE6 Roadway Classifications
MOBILE6 Roadway Classifications
Number
1
2
o
J
4
5
Abbreviation
Freeway
Arterial
Local
Fwy Ramp
None
Description
High-Speed, Limited-Access Roadways
Arterial and Collector Roadways
Urban Local Roadways
Freeway on and off ramps
Not Applicable (For start and some evaporative emissions)
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1.2.6 MOBILE6 Pollutant Categories
MOBILE6 Pollutant Categories
Number
I
1
3
4
5thru6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Abbreviation
HC
CO
NOx
CO,
(reserved)
S04
OCARBON
ECARBON
GASPM
Lead
SO,
NH,
Brake
Tire
BENZ
MTBE
BUTA
FORM
ACET
ACRO
Description
Hydrocarbons (gaseous)
Carbon Monoxide (gaseous)
Oxides of Nitrogen (gaseous)
Carbon Dioxide (gaseous)
Sulfate Portion of Exhaust Paniculate
Organic Carbon Portion of Diesel Exhaust Particulate
Elemental Carbon Portion of Diesel Exhaust Particulate
Total Carbon Portion of Gasoline Exhaust Particulate
Lead Portion of Exhaust Particulate
Sulfur Dioxide (gaseous)
Ammonia (gaseous)
Brake Wear Particulate
Tire Wear Particulate
Benzene
Methyl Tertiary Butyl Ether
1,3 -Butadiene
Formaldehyde
Acetaldehyde
Acrolein
1.2.7 MOBILE6 Hydrocarbon Categories
MOBILE6 Hydrocarbon Categories
Number
1
2
3
4
5
Abbreviation
THC
NMHC
voc
TOG
NMOG
Description
Total Hydrocarbons
Non-Methane Hydrocarbons
Volatile Organic Compounds
Total Organic Gases
Non-Methane Organic Gases
For detailed MOBILE6 definitions of these categories, please see Section 2.8.3.5.
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1.3 WHAT'S NEW IN MOBILE 6.1 and 6.2
1.3.1 MOBILE6.1
MOBILE6.1 adds the ability to estimate exhaust particulate matter, brake and tire wear
particulate, gaseous SO2, and gaseous ammonia to MOBILE6. (Pollutants number 7 through 15
in the list in Section 1.2.6) Exhaust particulate matter consists of four components: lead
particulate, an organic carbon portion, an elemental carbon portion, and a sulfate portion. For
gasoline-fueled vehicles, however, no distinction is made between the two carbon portions.
MOBILE6.1 is fully "upward compatible" with MOBILE6.0. All valid MOBILE6.0
input files are processed by MOBILE6.1 and produce virtually the same numerical results.
Several new input commands have been added to MOBILE6 to model these additional
pollutants: The PARTICIPATES command "turns on" the ability of MOBILE6.1 to estimate
these new pollutants and allows the user to specify which ones to report. If this command is
specified then three additional commands are required: PARTICLE SIZE to indicate what size
particulate should be reported, DIESEL SULFUR to input the sulfur level of diesel fuel, and
PARTICULATE EF which causes the model to read in particulate emission factors from a set of
external files. (Default input files are provided with the model.) Finally, an optional IDLE PM
EMISSIONS command instructs the model to report idle emission estimates for heavy duty
diesel vehicles in the particulate descriptive output.
An output file has been added to MOBILE6, to report the new particulate and
related pollutant results in a "descriptive" format. The default filename extension of this
file is .PM. In database format particulates are reported in the existing database output
file.
An additional SPREADSHEET output option has been provided for reporting the new
emissions added in MOBILE6.1 and 6.2 This output presents the descriptive output content in a
form easily imported into spreadsheet software.
The effects of the following MOBILE6.0 commands have been slightly modified or
expanded in MOBILE6.1 to provide for the modeling of the additional pollutants:
DATABASE EMISSIONS, which indicates which ETYPEs are to be written to the
database output, now accommodates the two new values for tire and brake wear.
NO DESC OUTPUT now suppresses output of the particulate descriptive output in
addition to the MOBILE6.0 descriptive output.
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Commands, such as EXPAND BUS EPS, which expand the vehicle types reported in the
descriptive output now effect both descriptive output reports.
The POLLUTANTS command, which governs inclusion of HC, CO, and NOx in both the
descriptive and database output reports, has been expanded to allow no pollutants to be
specified. This input, which would have been meaningless in MOBILE6, now tells
MOBILE6.1 to suppress all reporting of HC, CO, and NOx.
The REPORT FILE command now governs the naming of both the particulate descriptive
output file and the existing descriptive output file for HC, CO, and NOx.
The SULFUR CONTENT command can now also be called GASOLINE SULFUR.
More detail on the new and expanded commands can be found in the individual
command descriptions in Chapter 2.
1.3.2 MOBILE6.2
MOBILE6.2 adds the ability to estimate the emissions of six air toxic pollutants to
MOBILE6 (Pollutants number 16 through 21 in section 1.2.6.).
BENZ - Benzene 16
MTBE - Methyl Tertiary Butyl Ether 17
BUTA - 1,3-Butadiene 18
FORM - Formaldehyde 19
ACET - Acetaldehyde 20
ACRO - Acrolein 21
These emissions are estimated using the same algorithms as the MOBTOX emission model.
The user is also given the ability to specify additional air toxic pollutants. In this case the
user must supply emission factors for the additional pollutants and the calculations must assume
one of several simple forms. These forms include calculating emissions of the user-defined air
toxic as a fraction of VOC, TOG, PM, or independently.
MOBILE6.2 is "upward compatible" with MOBILE6.0 and 6.1. All valid MOBILE6.0
and 6.1 input files are processed by MOBILE6.2 and produce the same numerical results if the
air toxic emission calculation portion of MOBILE6.2 is not used. However, if the AIR TOXICS
command is specified in MOBILE6.2 which "turns on" the ability of the program to calculate the
emissions of the air toxic compounds, then several MOBILE6.0 and MOBILE6.1 commands
having to do with fuel properties and fuel control programs are no longer allowed. Instead, these
are replaced by new commands that allow the input of more detailed fuel property information.
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A number of new commands have been added to MOBILE6.2 to model air toxic
pollutants. The AIR TOXICS command "turns on" the ability of MOBILE6.2 to estimate these
new pollutants and allows the user to specify which ones to report. If this command is specified
then a number of additional commands are required as described in section 2.8.10.7 to provide
the additional fuel property information needed to calculate these emissions.
The ADDITIONAL HAPS command has been added to allow the user to provide the
information necessary to calculate additional, user-specified, air toxic emissions.
An output file has been added to MOBILE6, to report the new air toxic and related
pollutant results in a "descriptive" format. The default filename extension of this file is
".TOX". In database format toxics are reported to the existing database output file. User-
specified pollutant results are not written to the database output.
An additional SPREADSHEET output option has been provided for reporting the new
emissions added in MOBILE6.2 This output presents the descriptive output content in a form
easily imported into spreadsheet software.
The effects of the following MOBILE6.0 commands have been slightly modified or
expanded in MOBILE6.1 to provide for the additional pollutants:
NO DESC OUTPUT now suppresses output of the air toxic descriptive output in addition
to the MOBILE6.0 and MOBILE6.1 descriptive outputs.
Commands, such as EXPAND BUS EPS, which expand the vehicle types reported in the
descriptive output now effect all three descriptive output reports.
The REPORT FILE command now governs the naming of the air toxic descriptive output
file in addition to the other descriptive output files.
More detail on the new and expanded commands can be found in the individual
command descriptions in Chapter 2.
1.3.3 Simple Capability to Estimate CO2
MOBILE6.1/6.2 now includes the ability to estimate CO2 emissions. (Pollutant number 4
in the table in section 1.2.6.).
These emissions are estimated in a very simple fashion based on fuel economy
performance estimates built into the model or supplied by the user. Unlike most other MOBILE6
emission estimates, these CO2 emission estimates are not adjusted for speed, temperature, fuel
content, or the effects of vehicle inspection maintenance programs. This means that
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MOBILE6.1/6.2 cannot be used to model the effects on CO2 emissions by varying these
parameters. It also means that these CO2 emission estimates should only be used to model areas
and time periods which are large enough to reasonably assume that variation in these parameters
does not have a significant net effect.
The fuel economy estimates built into earlier versions of MOBILE6 have been revised
slightly in MOBILE6.1/6.2, which has a very slight effect on vehicle refueling emission
estimates, sulfate particulate estimates of gasoline-fueled vehicles, and the portion of diesel-
fueled vehicle paniculate emissions which are estimated to be sulfate particulate.
One command has been expanded and one new command has been added to facilitate the
estimation of CO2:
The POLLUTANTS command has been expanded to allow the additional pollutant CO2
to be specified. This "turns on" the ability of the model to produce CO2 and aggregated fuel
economy estimates, which are added to the descriptive output report for HC, CO, and NOx and to
any spreadsheet output produced. The CO2 estimates are also included in any database output
produced. (The database output already contained a MPG field.) The updated command
description is contained in section 2.8.3.1.
The optional MPG ESTIMATES command has been added to allow the user to provide
their own vehicle fuel economy performance estimates by vehicle class and model year. The
updated command description is contained in section 2.8.3.9. This command could be used to
model the effects of introducing improved vehicle fuel economy performance vehicles into the
future fleet.
1.3.4 Optional Input of Hourly Relative Humidity
In response to several comments, the optional RELATIVE HUMIDITY command has
been added to allow the user to specify hourly relative humidity values and relate these relative
humidity values directly to the hourly temperature values.
The optional BAROMETRIC PRES command allows the user to change the default value
of barometric pressure used to convert relative humidity to absolute humidity. The
BAROMETRIC PRES command can only be used in conjunction with the RELATIVE
HUMIDITY command.
1.4 SOURCES FOR USER SUPPORT AND TRAINING
EPA encourages MOBILE6 users seeking assistance beyond this User's Guide to take
advantage of the EPA web site.
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The Modeling Page at EPA's Office of Transportation and Air Quality Web
site (www.epa.gov/otaq/models.htm) offers the most complete documentation of MOBILE6 and
earlier versions of the model. This includes users' guides, technical reports, fact sheets,
presentations, peer review comments, and other materials. Numerous examples of input files for
running the model and the corresponding output are also accessible through this site. The Web
site offers links to related information such as emissions test data contained in the Mobile Source
Observation Database.
1.5 COMMENTS ON MOBILE6
EPA welcomes user comments and especially seeks specific suggestions for future
versions of the model. We encourage you to tell us what works in MOBILE6 and what does not,
relative to your most significant modeling needs. Please send your comments to the Assessment
and Standards Division, U.S. Environmental Protection Agency Office of Transportation and Air
Quality, 2000 Traverwood, Ann Arbor, MI 48105, or e-mail your comments to mobile@epa.gov.
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CHAPTER 2
MOBILE6 INPUTS
2.0 INTRODUCTION
This chapter explains the input files used to run MOBILE6. Through input files, users can
tailor MOBILE6 to best meet their needs. Input command choices allow modelers to specify the
format and content of the data that MOBILE6 calculates and reports. Input choices also allow
modelers to override MOBILE6 default inputs, which are often designed to automatically
produce "national average" emission results. Users can input local data and/or specifically model
local conditions via commands that allow users to supply alternate data.
Sections 2.1 through 2.7 present general information about input file structure and
command requirements. Section 2.8 discusses each of the input commands, which are grouped
by their function in MOBILE6. Section 2.1 provides an overview of MOBILE6 commands in the
order that they are presented in this chapter. Appendix A lists all MOBILE6 input commands
alphabetically, with cross-references to the appropriate user's guide section.
The reader is also encouraged to refer to the sample input files that are included with
MOBILE6 when reading this chapter on data input. These examples illustrate the use of
MOBILE6 options and data input requirements. However, reference to the examples alone
cannot substitute for a thorough reading of this chapter.
-22-
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2.1 OVERVIEW OF MOBILE6 COMMANDS
Command Name
MOBILE6 INPUT FILE
MOBILE6 BATCH FILE
RUN DATA
SCENARIO RECORD
END OF RUN
POLLUTANTS
PARTICULATE EF
PARTICULATES
PARTICLE SIZE
EXPRESS HC AS NMHC
User's Guide
Section
Separators
Separators
Separators
Separators
Separators
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Command
Input File
Section
Header
Header
End of
Header
Start of
Scenario
End of Run
Header
Scenario
Header
Scenario
Run
Command
Parameter
Type
Pollutant
Choice
External
files
Pollutant
Choice
Value
On/Off
Required
command?
Yes
Yes
Yes
Yes*
Yes*
Command Function
Identifies a M6 input file as a regular command
input file rather than a batch file.
Identifies a M6 input file as a batch file rather
than a regular command input file.
Marks end of Header section and beginning of
Run section of a regular M6 command input file.
Allows user to label individual scenario results.
Marks start of new scenario.
Required to separate multiple runs in command
input files.
Controls which pollutants (HC, CO, NOx,CO2)
will be calculated and output to the database
report and descriptive output.
Specifies the location of the data files that
contain the particulate emission factors.
*Required when PARTICULATES command is
used.
Enables the computation of particulate matter
(PM) and related emissions and specifies which
of these pollutants are calculated and reported.
Allows the user to specify the maximum
particulate size cutoff (PSC) that is used by the
model. Must be used if PARTICULATES
command used.
*Required when PARTICULATES command is
used.
Directs M6 to output exhaust HC as non-
methane hydrocarbons.
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Command Name
EXPRESS HC AS NMOG
EXPRESS HC AS THC
EXPRESS HC AS TOG
EXPRESS HC AS VOC
NO REFUELING
AIR TOXICS
ADDITIONAL HAPS
MPG ESTIMATES
REPORT FILE
NO DESC OUTPUT
EXPAND BUS EFS
User's Guide
Section
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Specifying
Pollutants and
Emission Rates
Descriptive Output
Descriptive Output
Descriptive Output
Command
Input File
Section
Run
Run
Run
Run
Run
Header
Scenario
Scenario
Header
Header
Run
Command
Parameter
Type
On/Off
On/Off
On/Off
On/Off
On/Off
Pollutant
Choice
External
file
External
file
Filename
On/Off
On/Off
Required
command?
Command Function
Directs M6 to output exhaust HC as non-
methane organic gases.
Directs M6 to output exhaust HC as total
hydrocarbons.
Directs M6 to output exhaust HC as total
organic gases.
Directs M6 to output exhaust HC as volatile
organic compounds.
Allows user to exclude refueling emissions from
all output values.
Enables the computation of air toxic emissions
and specifies which of these pollutants are
calculated and reported.
Allows the user to enter emission factors or air
toxic ratios for additional air toxic pollutants.
Allows the user to enter fuel economy
performance data by vehicle class and model
year to replace the default values built into the
model.
Specifies name for descriptive output files.
Prevents production of HC, CO, NOx
descriptive output.
Directs M6 to report gas, urban, and school bus
categories separately.
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Command Name
EXPAND HDDV EPS
EXPAND HDGV EPS
EXPAND LOT EPS
EXPAND EXHAUST
EXPAND EVAPORATIVE
IDLE PM EMISSIONS
SPREADSHEET
DATABASE OUTPUT
EMISSIONS TABLE
WITH FIELDNAMES
DATABASE AGES
DATABASE EMISSIONS
DATABASE FACILITIES
DATABASE HOURS
DATABASE VEHICLES
User's Guide
Section
Descriptive Output
Descriptive Output
Descriptive Output
Descriptive Output
Descriptive Output
Descriptive Output
Spreadsheet Output
Database Output
Database Output
Database Output
Database Output
Database Output
Database Output
Database Output
Database Output
Command
Input File
Section
Run
Run
Run
Run
Run
Run
Header
Header
Header
Header
Header
Header
Header
Header
Header
Command
Parameter
Type
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
Filename
On/Off
Vehicle
age choice
Etype
choice
Facility
choice
Hours of
day choice
Vehicle
choice
Required
command?
Command Function
Directs M6 to display EFs by 8 HDDV classes.
Directs M6 to display EFs by 8 HDGV classes.
Directs M6 to display EFs by 6 LOT classes.
Specifies that start, running, and total exhaust
EFs be displayed in descriptive output.
Display all 6 evaporative emission types in
descriptive output.
Displays idle mode particulate emission factors
for heavy-duty diesel vehicle classes 2b through
8b and diesel buses.
Instructs MOBILE6 to output the average
calendar year emission factors in a form
suitable for direct input into a spreadsheet
program.
Causes database output report to be produced.
Specifies a file name for the database output
file.
Specifies that a header record of field names is
to be generated for the database output.
Limits which of the 25 vehicle ages are reported
in database output format.
Limits which of 1 0 types of emissions are
reported in database output format.
Limits which of 5 roadway types are reported in
database output format.
Limits which 24 hours of the day are reported in
database output format.
Limits which of 28 vehicle types are reported in
database output format.
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Command Name
DATABASE YEARS
DAILY OUTPUT
AGGREGATED OUTPUT
DATABASE OPTIONS
CALENDAR YEAR
EVALUATION MONTH
MIN/MAXTEMP
HOURLY
TEMPERATURES
ALTITUDE
ABSOLUTE HUMIDITY
CLOUD COVER
PEAK SUN
SUNRISE/SUNSET
RELATIVE HUMIDITY
User's Guide
Section
Database Output
Database Output
Database Output
Database Output
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
External Conditions
Command
Input File
Section
Header
Header
Header
Header
Scenario
Scenario
Run or
Scenario
Run or
Scenario
Scenario
Run or
Scenario
Run or
Scenario
Run or
Scenario
Run or
Scenario
Scenario
Command
Parameter
Type
Model year
choice
On/Off
On/Off
External
file
Value
Value
Values
Values
Option
Value
Value
Value
Values
Values
Required
command?
Yes
Yes*
Yes*
Command Function
Limits which of the 25 model years, based on
the calendar year chosen are in database
output format.
Database output by daily time periods.
Database output by daily time periods
aggregated to the level of the descriptive output.
Specifies name for external file holding a set of
database output selection records.
Calendar year of scenario evaluated.
Specifies January 1 or July 1 for calendar year
of interest.
Specifies minimum and maximum daily
temperatures.
*This command is required unless HOURLY
TEMPERATURES is used.
Allows entry of 24 hourly temperatures.
*This command is required unless MIN/MAX
TEMP is used.
High or low altitude of area evaluated.
Absolute humidity in grains per pound.
Allows user to input fraction of cloud cover for a
given day.
Allows input of 2 daily times demarcating period
of peak sun.
Specifies times for sunrise and sunset for A/C
calculations.
Allows user to specify hourly relative humidity
values and to relate these relative humidity
values directly to the hourly temperature
-26-
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Command Name
BAROMETRIC PRES
REG DIST
DIESEL FRACTIONS
MILE ACCUM RATE
VMT FRACTIONS
NGV FRACTION
NGVEF
VMT FRACTIONS
VMT BY HOUR
VMT BY FACILITY
User's Guide
Section
External Conditions
Fleets
Fleets
Fleets
Fleets
Fleets
Fleets
Activity
Activity
Activity
Command
Input File
Section
Scenario
Run
Run or
Scenario
Run
Run or
Scenario
Run
Run
Run or
Scenario
Run or
Scenario
Run or
Scenario
Command
Parameter
Type
Values
External
file
Values
External
file
Values
External
file
External
file
Values
External
file
External
file
Required
command?
Command Function
values(see also the BAROMETRIC PRES
command).
Allows user to supply a daily average
barometric pressure.
Allows user to supply vehicle registration
distributions by age for all 16 composite
vehicles types.
Allows user-supplied alternate diesel sales
fractions.
Allows user to supply annual mileage
accumulation rates by age for each of the 28
vehicle types.
Allows user to apply alternate VMT fractions by
each of 16 combined vehicle types.
Indicates percentage of natural gas vehicles in
each of the 28 vehicles classes.
Allows the user to enter alternate NGV emission
factors for each of the 28 vehicle types, for each
of the three pollutants, and (where applicable)
for running and start emissions. Must be used
in conjunction with NGV FRACTION command.
Allows user to apply alternate VMT fractions by
each of 16 combined vehicle types.
Allows user to supply alternate hourly
distributions of VMT.
Allows user to supply alternate VMT
distributions by facility type.
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Command Name
SPEED VMT
AVERAGE SPEED
STARTS PER DAY
START DIST
SOAK DISTRIBUTION
HOT SOAK ACTIVITY
DIURN SOAK ACTIVITY
WE DA TRI LEN Dl
WE EN TRI LEN Dl
WE VEH US
FUEL PROGRAM
STAGE II REFUELING
User's Guide
Section
Activity
Activity
Activity
Activity
Activity
Activity
Activity
Activity
Activity
Activity
State Programs
State Programs
Command
Input File
Section
Run or
Scenario
Scenario
Run
Run
Scenario
Scenario
Scenario
Run or
Scenario
Run or
Scenario
Scenario
Run or
Scenario
Run
Command
Parameter
Type
External
file
Value
External
file
External
file
External
file
External
file
External
file
External
file
External
file
On/Off
Program
description
Program
description
Required
command?
Command Function
Allows user to enter VMT distribution across 14
preselected average speed ranges for each of
the 24 hours of the day for each scenario.
Allows the user to enter a single average speed
value, rather than an average speed
distribution.
Allows user to change default average number
of engine starts per day per vehicle.
Allows user to enter the hourly temporal
distribution of engine starts (trips) during the
day.
Allows user to enter soak duration distributions
for each hour of day.
Specifies alternative distribution of lengths of
hot soaks.
Specifies alternative distribution of diurnal soak
times.
Specifies the weekday hourly running loss trip
length percentages.
Specifies the weekend hourly running loss trip
length percentages.
Directs M6 to use the weekend activity fractions
in its calculations.
Designates fuel sulfur level of gasoline and
whether reformulated gasoline (RFC) use
should be assumed.
Allows modeling of impact of Stage II "at-the-
pump" vapor recovery system for refueling
emissions.
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Command Name
ANTI-TAMP PROG
I/M PROGRAM
I/M MODEL YEARS
I/M VEHICLES
I/M EXEMPTION AGE
I/M GRACE PERIOD
I/M EFFECTIVENESS
I/M COMPLIANCE
I/M WAIVER RATES
I/M CUTPOINTS
NO I/M TTC CREDITS
User's Guide
Section
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
State Programs
Command
Input File
Section
Run
Run
Run
Run
Run
Run
Run
Run
Run
Run
Run
Command
Parameter
Type
Program
description
Program
description
Values
Vehicle
choice
Value
Value
Value
Value
Values
External
file
On/Off
Required
command?
Command Function
Anti-tampering programs.
Required record if I/M program being modeled,
indicating program start and end dates,
frequency, and test type.
Required record if I/M program being modeled,
indicating vehicle model years subject to I/M
program.
Required record if I/M program being modeled,
indicating vehicle types subject to I/M.
Optional record indicating age that vehicle
automatically becomes exempt from I/M
program.
Optional record indicating when vehicle first
becomes subject to I/M program.
Reduce I/M effectiveness to account for Test
and Repair losses.
Required input if I/M program is modeled,
indicating percentage of total vehicle fleet
certified or waived by I/M program.
Required record if I/M program is modeled,
indicating percentage of vehicles failing initial
I/M test and do not have to pass a retest.
Required record for outpoints if IM240 used. Do
not use with other exhaust or evaporative I/M
programs
Optional record to eliminate credit for a
technician training program.
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Command Name
I/M STRINGENCY
I/M DESC FILE
FUEL PROGRAM
SULFUR CONTENT or
GASOLINE SULFUR
DIESEL SULFUR
OXYGENATED FUELS
FUEL RVP
SEASON
GAS AROMATIC%
GAS OLEFIN%
User's Guide
Section
State Programs
State Programs
Fuels
Fuels
Fuels
Fuels
Fuels
Fuels
Fuels
Fuels
Command
Input File
Section
Run
Run
Run or
Scenario
Scenario
Scenario
Run or
Scenario
Run or
Scenario
Run or
Scenario
Scenario
Scenario
Command
Parameter
Type
Values
External
file
Program
description
Value
Value
Values
Values
Value
Value
Value
Required
command?
Yes*
Yes
Yes*
Yes*
Command Function
Required record if modeling I/M program,
indicating initial test failure rate (%) for pre-1981
LDGVs and pre-1984 LDGTs.
Optional external input file containing I/M
program description records.
Designates fuel sulfur level of gasoline and
whether RFC use should be assumed.
Allows user to enter alternate sulfur content of
gasoline (ppm) that overrides M6 default of 300
ppm for years prior to 2000.
Allows user to input the average diesel fuel
sulfur level for the scenario.
*Required if PARTICULATES command is
used.
Allows modeling of the effects of oxygenated
gasoline on exhaust emissions.
Required input of average gasoline Reid vapor
pressure.
Allows the user to specify winter or summer
RFC, independent of evaluation month.
Allows the user to specify the aromatic content
of gasoline on a volume of fuel percentage
basis.
* Required if the AIR TOXICS command is
used.
Allows the user to specify the olefin content of
gasoline on a volume of fuel percentage basis.
* Required if the AIR TOXICS command is
used.
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Command Name
GAS BENZENE%
E200
E300
OXYGENATE
RVP OXY WAIVER
NO CLEAN AIR ACT
User's Guide
Section
Fuels
Fuels
Fuels
Fuels
Fuels
Alternative
Regulations and
Control Programs
Command
Input File
Section
Scenario
Scenario
Scenario
Scenario
Scenario
Run
Command
Parameter
Type
Value
Value
Value
Value
Value
On/Off
Required
command?
Yes*
Yes*
Yes*
Yes*
Command Function
Allows the user to specify the benzene content
of gasoline on a volume of fuel percentage
basis.
* Required if the AIR TOXICS command is
used.
Allows the user to specify the percentage of
vapor that a given gasoline fuel produces at 200
degrees F.
* Required if the AIR TOXICS command is
used.
Allows the user to specify the percentage of
vapor that a given gasoline fuel produces at 300
degrees F.
* Required if the AIR TOXICS command is
used.
Allows the user to specify the particular gasoline
fuel oxygenate type, the fuel oxygenate content
(percent by volume), and the market share.
This command supercedes the OXYGENATED
FUELS command if the AIR TOXICS command
is used.
* Required if the AIR TOXICS command is
used.
Enables the user to specify whether a Reid
vapor pressure (RVP) waiver has been granted
to allow "splash" blending of alcohol-based
oxygenates.
Allows users to model vehicle emissions as if
the Federal Clean Air Act Amendments of 1990
had not been implemented.
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Command Name
NO DEFEAT DEVICE
NO NOX PULL AHEAD
NO REBUILD
REBUILD EFFECTS
NO TIER2
T2 EXH PHASE- IN
T2 EVAP PHASE-IN
User's Guide
Section
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Command
Input File
Section
Run
Run
Run
Run
Run
Run
Run
Command
Parameter
Type
On/Off
On/Off
On/Off
Value
On/Off
File name
File name
Required
command?
Command Function
Allows users to turn off the effects of the heaw-
duty diesel vehicle NOx off-cycle emission
effects (defeat device emissions).
Allows the user to turn off the effects of the Pull
Ahead mitigation program used to reduce
heavy-duty diesel vehicle NOx off-cycle
emissions.
Allows the user to turn off the effects of the
Rebuild mitigation program used to reduce
heavy-duty diesel vehicle NOx off-cycle
emissions.
Allows the user to change the Rebuild program
effectiveness rate used to reduce heavy-duty
diesel vehicle NOx off-cycle emissions.
Allows the user to disable the Tier 2 emission
standards and fuel sulfur requirements.
Allows the user to replace the default phase-in
fractions (by certification bin) for the Tier 2
exhaust emission standards, allowing different
phase-in schedules to be modeled. Also
necessary to model the exhaust effects of the
California LEV II requirement.
Allows the user to replace the default phase-in
fractions (by certification bin) for the Tier 2
evaporative emissions standards, permitting
different phase-in schedules to be modeled.
Also necessary to model the evaporative effects
of California's LEVII requirement.
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Command Name
T2 CERT
94+ LOG IMP
NO 2007 HDDV RULE
User's Guide
Section
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Alternative
Regulations and
Control Programs
Command
Input File
Section
Run
Run
Run
Command
Parameter
Type
File name
File name
On/Off
Required
command?
Command Function
Allows the user to specify alternative Tier 2
50,000 mile certification standards. Also
necessary to model the effects of California's
LEV II requirement.
Allows the user to input optional 1994 and later
fleet penetration fractions for light-duty gasoline
vehicles under the Tier 1 , NLEV (or California
LEV 1), and Tier 2 standards.
Allows the user to disable the 2007 heavy duty
vehicle emission standards.
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2.2 RUNNING MOBILE6: MODEL INTERFACE
When MOBILE6 is started, the user will be prompted to enter the name of a MOBILE6
input file. The user may then enter a DOS path name followed by a file name. Most users will
probably want to place the input file in the same directory as the MOBILE6 executable and have
this directory be the current DOS directory, and enter a simple file name.
Another option is to enter a blank line, in which case MOBILE6 uses the default input file
name, "MOBILE6.IN", and expects the file to be located in the current DOS directory. In either
case, MOBILE6 cannot run without a valid input file at the expected location. If the named input
file does not exist, MOBILE6 prompts the user to enter another input file name. If the user enters
a blank line in response to this second prompt, the program stops. Otherwise, the program
continues prompting until the user enters the name of an existing file. When MOBILE6 finds the
input file, it creates a corresponding descriptive output file. (See Chapter 3 for detailed
information on MOBILE6 output. See Section 4.5 for detailed information on MOBILE6 input
and output file names and extensions.)
MOBILE6 commences the run as soon as the user enters the name of a valid (i.e.,
existing) input file. Messages indicating that the model is reading input information and
performing calculations will appear on the screen. Run duration depends on the complexity of the
input file. If there have been no errors, the message, "driver calls completed" will appear,
indicating that MOBILE6 has completed the calculations and has produced its output.
EPA is aware that many users would prefer an interactive, menu-driven interface that
would construct input files based on selections made by the user. Such an interface is beyond the
scope of MOBILE6 but will be considered for future versions of the model.
2.3 HOW TO CREATE AN INPUT FILE
1. Open a software application capable of creating text files (e.g., a text editor such as
Notepad or a word processor such as WordPerfect). Create a text file and give it a
name. MOBILE6 input file names must follow DOS file naming syntax; they must be
limited to eight characters or less, plus an extension (in the form of ".EXT") of up to
three characters.
The user may choose an input file name that either includes or does not include a
period with a file name extension. If the file name contains a period, it will be used by
MOBILE6 exactly as written. If the file name does not contain a period, the program
first searches for a file with the specified name and an extension of ".IN". If that file
is not found, the program then searches for a file named exactly as specified.
2. Specify the input commands you wish to enter. A few commands are required.
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Please see Section 2.4: Input Structure, and Section 2.5: Input Content, for command
definitions and detailed information on how to create command input files. The model
supports the creation of multiple sets of results from within a single command or
batch input file.
3. Save the file as an ASCII DOS text file. MOBILE6 cannot recognize other file types.
NOTE: MOBILE6 input files may not contain "tab" characters or non-ASCII characters
in any input command line.
2.4 INPUT STRUCTURE
There are three types of MOBILE6 input files: command files, batch files, and external
data files. All three types must be ASCII DOS text files and may not contain "tab" characters or
non-ASCII characters in any input line. Command input files are the method for users to specify
what sort of results are needed from MOBILE6. External data files are associated with some
individual commands. The content and format for external data files are discussed in Section 2.7
and 2.8, along with their specific commands.
2.4.1 Command Input Files
All command input files begin with the MOBILE6 INPUT FILE command. Command
input files provide program control information and data describing the scenarios for which
emission factors are to be estimated. The input information consists of three distinct sections:
The Header section controls the overall input, output, and execution of the program.
For example, the Header section may direct MOBILE6 to output emission factors in a
format suitable for visual inspection (descriptive output) and/or in a format suitable as
input to another program (database output). Information supplied in the Header
section will apply to all runs and scenarios described in the command input file.
Commands that may appear in the Header section are indicated in Section 2.1. The
RUN DATA command indicates the end of the Header section of the command input
file.
The Run section allows users to define parameter values that localize or customize
their MOBILE6 runs. For example, users can specify alternate annual mileage
accumulation rates or registration distributions by age for each vehicle type. In
addition, the Run section allows users to specify further control program parameters,
such as description(s) of inspection and maintenance program(s). Information
supplied in the Run section is specified once and applies to all scenarios in that run.
Commands which may appear in the Run section are indicated in Section 2.1 above.
Some commands may appear in either the Run or Scenario sections. A command
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input file may contain multiple runs. The first Run section begins with the RUN
DATA command and ends with the first SCENARIO RECORD command. The next
Run section begins with the END OF RUN command from the previous run and ends
with the next SCENARIO RECORD command.
The Scenario section details the individual scenarios for which emission factors are to
be calculated. For example, the Scenario section must specify the calendar year of
evaluation and may also specify other information, such as the month of evaluation
and temperatures. Each MOBILE6 run can include many scenarios. Information
supplied in the Scenario section is applied to results only from that scenario.
Commands that may appear in the scenario section are indicated in Section 2.1 above.
Some commands may appear in either the Run or Scenario sections. Each scenario
begins with the SCENARIO RECORD command and ends with the next SCENARIO
RECORD command or ends with an END OF RUN command (indicating the end of
all scenarios within that run).
A MOBILE6 command input file must begin with a Header section and may contain
many separate Run sections, or runs. Each command input file must contain at least one run, and
each Run section must contain at least one or more scenarios. Any data item entered in the Run
section is used for every scenario within the run, unless it is replaced in any scenario by a local
value as described below (blank lines represent additional scenarios). The end of the command
input file is considered as the end of the last run. The END OF RUN record at the end of the last
scenario in the command input file is therefore optional, but recommended. The overall structure
of a MOBILE6 command input file is:
> Header Section
* First Run Data Section
* First Scenario Data Section
> Second Scenario Data Section
» Last Scenario Data Section
Second Run Data Section
* First Scenario Data Section
> Second Scenario Data Section
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Last Scenario Data Section
* Last Run Data Section
> First Scenario Data Section
* Second Scenario Data Section
* Last Scenario Data Section
MOBILE6 assigns default values for most of the data items that may appear in a
MOBILE6 command input file. It is not necessary to enter data for these items if the default
value is acceptable for all scenarios in that run. Because all of the input commands that appear in
the run sections have default values, it is not necessary to enter any records in the Run section of
a MOBILE6 command input file. A run may begin with a SCENARIO RECORD command.
2.4.2 Batch Input Files
All batch input files begin with the MOBILE6 BATCH FILE command, which is the only
MOBILE6 command allowed in a batch input file. The purpose of a batch input file is to direct
MOBILE6 to execute a series of command input files without involving the user. This allows for
a large and complex series of MOBILE6 results to be generated from a single input file. Many
users will not need to use this option because the command input file structure allows multiple
runs and scenarios (see Section 2.4.1).
The structure of a batch input file is simple: it consists of any number of lines that name
command input files to be processed, along with any number of blank and comment lines. Each
active line in the file will contain a file name (with or without the DOS path). The file name is
expected to be the name of an existing MOBILE6 command input file. MOBILE6 will read and
execute the commands in the specified command input file and generate results. After
completing each command input file, MOBILE6 will read the file name found on the next line in
the batch input file and execute the commands in the next command input file. In this way, a
series of separate MOBILE6 command input files can be completed with a single execution of
the MOBILE6 application.
After the entry of the MOBILE6 BATCH FILE command, the only other active lines in
the file contain file names. No other MOBILE6 commands can appear in a batch input file, other
than comments and blank lines. All input file names in the batch input file must be existing
MOBILE6 command input files. The indicated file names may not be other batch input files. All
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the input files indicated in the batch input file will run until all command input files have been
completed or an error occurs.
See Section 2.8.2.2 for more details about the MOBILE6 BATCH FILE command.
2.5 COMMAND INPUT FILE CONTENT
This section describes the contents of valid MOBILE6 command input files.
Users specify the type of results by putting "commands" in a standard command input
file. Section 2.1 provides an overview of the valid MOBILE6 commands. Section 2.8 presents a
detailed discussion of each valid input command.
Most commands are optional in MOBILE6 command input files. The seven commands
that are required in every command input file are given in the following table:
Table of Required MOBILE6 Input Records
Command Name (full text)
MOBILE6 INPUT FILE
RUN DATA
FUEL RVP
Temperature either as:
MIN/MAX TEMPERATURE
HOURLY TEMPERATURE
SCENARIO RECORD
CALENDAR YEAR
END OF RUN
MOBILE6 Section
Header
Header
Run or Scenario
Run or Scenario
Scenario only
Scenario only
Scenario only
User's
Guide Section
2.8.2.1
2.8.2.3
2.8.10.
2.8.6.3
5
,2.8.6.4
2.8.2.4
2.8.6.1
2.8.2.5
As discussed in Section 2.4, particular commands may appear only in particular sections
of the command input file. However, within a section, the order of the commands does not
matter. For example, it does not matter whether the FUEL RVP command appears before or after
the CALENDAR YEAR command in the Scenario section of the input. If a command appears
more than once within a section, only the last occurrence will be used. This should be avoided
because it may cause confusion and inappropriate results.
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Commands can contain only ASCII characters. MOBILE6 command input files may not
contain "tab" characters or non-ASCII characters in any input command or line. However,
commands may be entered in upper, lower or mixed case.
Command input files may also contain blank lines and comments; and this is encouraged
to make the command input files more easily read and understood. The use of comments is
described in Section 2.6.3.
2.6 INPUT FORMAT
There are specific content and format requirements for the commands in a MOBILE6
command input file.
Each command has a unique name that should appear precisely as specified (e.g.,
MOBILE6 INPUT FILE). In some cases, the command name itself acts as an on/off switch that
signals MOBILE6 to perform a specific action. In many cases, however, users must supply
additional information. This can take the form of data parameters that follow the command name.
Such entries are considered to be "internal" because the information is provided within the
command input file. In contrast, many MOBILE6 commands require extensive user-supplied data
that users must provide in separate files called "external" data files, which are discussed in
Section 2.7.
MOBILE6 reads up to 150 characters of any input line, including comments, commands,
and data lines. MOBILE6 allows three types of input lines, which are:
> Command lines: these lines give information that controls the calculations or
output of MOBILE6 runs and scenarios. Command lines consist of a command
name, sometimes followed by a data field.
A command name always appears in columns 1 through 19 of a MOBILE6
command line. The command name may appear in upper or lower case, and any
number of blanks may precede the first word of the command or appear between
the words of commands that use more than one word.
By convention, a colon (:) appears in column 20 of the command line, but it is not
required. Column 21, by convention, is usually left blank to separate the data from
the colon. Any data that appears on the command line usually starts in column 22.
* Data lines: these lines follow an associated command name and provide data
associated with the command.
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The data may usually occur in any column, including columns 1 through 19. All
data must appear within the 150 characters read by MOBILE6 from each line.
Users should consult the specific format requirements for data lines discussed
with the associated commands in Section 2.8. Section 2.6.1 discusses the types of
data formats used in MOBILE6.
* Comment lines: these are optional lines that allow users to document or describe
the MOBILE6 scenario or run.
Except within blocks of data, or between a data line and the command that defines
it, any number of blank lines or comment lines are allowed anywhere in the
command input file. This allows MOBILE6 command input files to contain
documentation so that they are easy to read and understand by those who develop,
maintain, and use the files.
2.6.1 Free Versus Fixed Format Data Entry
There are two basic formats that the model uses to read data values provided by the user:
"free" and "fixed" column formats. Individual MOBILE6 commands require a particular format.
A free column format allows the values to occur in any column in the data space, as long as
individual values are separated by a separating character. The separating character may be a
blank space or a comma. In a fixed column format, the data must be located in a specific column
or group of columns in the data space. MOBILE6 utilizes both types of user input format. The
user must be aware of the differences between these input types and the limitations of each in
order to avoid errors when entering data values.
Free format allows the data values to be entered into any column in the data space. If the
data follows a command on the same line, the columns following the command can act as the
data space, beginning in column 21. For commands which require their data parameters to begin
on the following line or which require an external data file, the data values may appear in any
column, including columns 1 through 21. No data can ever appear after column 150. File names,
including path, are usually limited to 80 characters. Each data value entered must be separated
from other values by a separating character, either a blank space or a comma. If blanks are used,
as many blank characters may separate values as desired. If a comma is used, only one comma
may occur between values. We suggest that only blank spaces be used to separate values when
using the free column format. Values that are intended to be integers may be entered including a
decimal (e.g., 2.0), but any fractional value included after the decimal will be dropped from the
value used by the model. For example, entering the value 1.9 into a field intended to be an
integer will result in the value used being 1.0, and the fractional portion of the value (0.9) will
not be used. Values that are intended to be real numbers are not required to include a decimal if
the value is a whole number. The values may have as many numbers after the decimal as desired,
but the use of the values is limited by the precision of the computer itself. If there is a series of
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values to be entered and the data may follow the command line or the data is located in an
external file, the number of lines on which the data is entered may vary. For example, if 24
values are to be entered, they may be on a single line with all 24 values, on two lines with 12
values each, on 6 lines with 4 values each, or in any other combination so long as the total of 24
values appear in the proper sequence.
Fixed format requires that all values be located in specific locations on the command line
or other data lines. The locations are specified in the model by a Fortran format statement, which
is sometimes included with the description of the data entry. Decoding the Fortran format
statement is described in Section 2.6.2. Each value must occur wholly within the columns
specified. For example, if an integer value must be entered within two columns, it is impossible
to enter a three-digit value because the three-digit character will not be read if it lies outside the
two columns. Real values that contain a decimal can alter the default decimal places specified by
the format, but the total number of characters used must fall within the specified columns. If an
integer value is expected and the user enters a value that contains a decimal within the specified
columns, the model cannot read the value and will give an error message. The values must be
entered in the columns, rows, and order specified by the format description.
2.6.2 How to Read Fortran Format Specifications
Some of the descriptors used in Section 2.8 to define and describe the input field
specifications are Fortran format specifications. Following is a brief key for interpretation.
Additional guidance can be found in any Fortran manual.
Descriptor Definition and Interpretation
'Iw' The next w characters (columns; includes blank spaces) will be read in as
an integer value. Leading blanks are ignored, but trailing blanks are read as
zeroes; thus, integer input values should be "right-justified" within the
input field (e.g, if a value of "2" is to be entered in a field specified as 12,
the two columns should be filled in "blank,2", not "2,blank" which will be
interpreted as "20").
Tw.d' The next w characters will be read in as a floating-point real number, in
which d is the number of digits to the right of (following) the decimal
point. If the field contains an explicit decimal point, the value will be read
as specified, and the implied point specified by d in the descriptor will be
overridden. The decimal point, if present, is considered a character in the
overall field width, w. If the field does not contain an explicit decimal
point (which is not recommended), then d places are considered to be to
the right of an "implied" decimal point.
'Aw' The next w characters will be interpreted and stored as alphanumeric (i.e.,
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labels or text). Control characters, such as tabs, and non-ASCII characters
may not be used.
'wX' The next w characters will be ignored; they are not read by MOBILE6.
V The field separator, used to indicate the end of one record (line of input).
Input after the '/' will be read from the next record.
'n()' The format specification inside the parentheses is repeated 'n' times.
2.6.3 COMMENTS
MOBILE6 has flexible features for adding comments and blank lines to input files. Users
are encouraged to use these capabilities to improve the documentation and readability of input
files. Certain comments can appear on the monitor screen or in the descriptive output files, and
users are encouraged to take advantage of this to improve the documentation in the output files.
Two types of comment lines are supported in MOBILE6 command input files. The first
type of comment is a line that has an asterisk (*) in the first column of the line. This type of
comment line is ignored by the model, just like a blank line, and does not affect the output in any
way. The second type of comment line has a "greater than" symbol (>) in the first column. This
type of comment line is read by the model and printed to the output. The "greater than" symbol is
changed to an asterisk before the line is displayed, otherwise it is copied exactly as it is found in
the command input file. If the comment is in the Header section, the comment appears only on
the monitor screen. If the comment containing a "greater than" symbol appears in either the Run
or Scenario section of the command input file, the comment is written to the descriptive output
file. Comments are never written to the database or spreadsheet output files.
In addition to comment lines, blank lines help organize the command input file by
providing white space, making the file easier to read.
Comments and blank lines should never be placed within a block of data that follows a
command within a command input file, unless this feature is explicitly noted in the description of
the command.
2.7 EXTERNAL DATA FILES
MOBILE6 reads certain types of data from external data files. These data include
user-supplied tampering rates, mileage accumulation rates, and vehicle registration distributions.
In fact, most commands that require significant amounts of user-supplied data rely on external
data files.
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When external files are employed, MOBILE6 expects to find a file name in the data field
to the right of the colon on the command line. File names can be in either upper or lower case;
they may include path information; and they may appear anywhere in the data field of the input
record starting at or to the right of column 21. MOBILE6 always prints the names of any external
data files it uses in the descriptive output report. MOBILE6 accepts file names up to 80
characters in length, including file path information. MOBILE6 assumes that external data file
names that do not include path information appear in the same directory as the application.
Blank or comment lines may appear in front of the Header section in the external data
file, between the Header section and the data, or at the end of the file after the data is complete.
However, no blank or comment lines may appear between the first line and the last line of the
data block unless specifically indicated in the description for the command. Blank lines and
comment lines in external data files can provide annotation for internal documentation or provide
text that will be echoed to the descriptive output file.
The specific content and format for external data files are described with the commands
that require the data. The descriptions for each command are found in the next section.
2.8 MOBILE6 COMMANDS
2.8.1 Overview
By using model inputs, called "commands," MOBILE6 users can tailor modeling results
to reflect specific local conditions. MOBILE6 commands also serve certain administrative
functions such as marking the beginning or end of a modeling exercise. A complete list of
MOBILE6 input commands organized by function appears in Section 2.1. An alphabetical list
appears in Appendix A. This section presents each MOBILE6 command in detail. The following
general format is used:
Name: Full name and allowable abbreviations.
Status: Required or Optional.
Section: Header, Run, or Scenario.
Description: Brief summary of what the command does.
Default: The action MOBILE6 takes, or value it applies, unless the user supplies
alternative information.
Explanation: Detailed "how-to" information for users. Covers user options, model calculations,
information requirements, and format specifications.
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Example: Example of properly formatted input for the command.
Tips: Suggestions for facilitating MOBILE6 operation.
References to technical documentation occur throughout this section. Sample external
data files will be distributed with the model, and MOBILE6 technical reports can be found on the
EPA's MOBILE6 Web page http://www.epa.gov/otaq/models.htm.
2.8.2 Separator Commands
As explained in Section 2.4, a MOBILE6 command input file consists of three sections.
Separator commands mark the beginning or end of a MOBILE6 command input file, as well as a
Header, Run, and/or Scenario section within a MOBILE6 command input file.
2.8.2.1 First Record of a Regular Command Input File
Name: MOBILE6 INPUT FILE
Status: Required for all regular command input files.
Section: Header.
Description: Identifies MOBILE6 command input file as a regular file as opposed to a batch
file.
Default: There is no MOBILE6 default. Users must supply this command in all input files
except batch files.
Explanation: This command must be the first data record in a MOBILE6 input file. The data
field of this record is not used and should be left blank. No additional information
is required or allowed.
Example: MOBILE6 INPUT FILE
2.8.2.2 First Record of a Batch File
Name: MOBILE6 BATCH FILE
Status: Required for MOBILE6 batch files.
Section: Header.
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Description: Identifies a MOBILE6 input file as a list of command input file names as opposed
to a standard command input file.
Default: There is no MOBILE6 default. Users must supply this command as the first and
only command in all batch input files.
Explanation: This command must be the first record in a MOBILE6 batch input file. The data
field of this record is not used and should be left blank. No additional information
is required or allowed on the command line.
The MOBILE6 BATCH FILE command is the only command allowed in the
batch input file. The remaining lines in the batch file must identify standard
command input files, include comments, or be left blank. Nesting of batch input
files (listing another batch input file name within a batch input file) is not allowed.
All comments using a "greater than" symbol will be written to the monitor screen
during execution.
MOBILE6 expects to find each command input file name in a separate line within
the batch input file. Any number of lines containing valid command input file
names may appear following the MOBILE6 BATCH FILE command. File names
can be given in either upper or lower case; they may include path information; and
they may appear anywhere in the input record, beginning with column 1. The
actual file names cannot have more than 8 characters before the period. MOBILE6
accepts file name entries up to 80 characters, including file path information, and
assumes that file names that do not include path information appear in the same
directory as the application. MOBILE6 will echo the names of the command input
files being processed to the monitor screen during execution.
Additional features for designation of input and output file names in MOBILE6
batch input files are discussed in Section 4.5.
Example: MOBILE6 BATCH FILE
FILE1.IN
FILE2.IN
FILELAST.IN
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2.8.2.3 End of Header Section
Name: RUN DATA
Status: Required.
Section: Header.
Description: This command marks the end of the Header section and the beginning of the first
Run section of a regular MOBILE6 command input file.
Default: There is no MOBILE6 default. Users must supply this information in all
command input files.
Explanation: This command has a purely administrative function. No information is required
except for the command name.
Example: RUN DATA
2.8.2.4 Scenario Record
Name: SCENARIO RECORD
Status: Required.
Section: Scenario.
Description: This command serves two purposes: it marks the beginning of a new scenario, and
it allows the user to enter text to be printed at an appropriate location in the
descriptive output file.
Default:
There is no default. This command must be present.
Explanation: This feature permits the user to specify individual scenario calculations. The only
required information is the command name, followed by whatever scenario-
identifying text the user wants to appear in the descriptive output. The text must
begin in column 22 of the line. At least one SCENARIO RECORD command is
required in every regular MOBILE6 command input file. Additional SCENARIO
RECORD commands are necessary to generate multiple output results (e.g.,
multiple calendar years).
Example: SCENARIO RECORD : Washington DC
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This input indicates the beginning of a modeling exercise specific to Washington,
DC, and causes the text "Washington DC" to appear before results in the output
file.
2.8.2.5 End of Run
Name: END OF RUN
Status: Required.
Section: Run.
Description: This command marks the end of each Run section of a MOBILE6 command input
file and is used to separate multiple MOBILE6 runs.
Default: There is no MOBILE6 default. This command must be present.
Explanation: This command must appear at the end of the last scenario of each Run section of a
command input file.
Example: END OF RUN :
2.8.3 Commands to Specify Pollutants and Emission Rates
These commands allow the user to specify which pollutant emissions are reported and to
provide alternative emission and fuel economy rates for some categories of pollutants. The
commands in this section affect which pollutants are reported in all forms of MOBILE6 output
(database, descriptive, and spreadsheet).
2.8.3.1 Specifying Which Pollutants are Reported
Name: POLLUTANTS
Status: Optional.
Section: Header.
Description: Defines which of a basic set of pollutants (HC, CO, NOx, and CO2) that
MOBILE6 reports. This command provides the means to add reporting of CO2
emissions in MOBILE6.1/6.2. (Refer to the PARTICIPATES command to
specify reporting of additional particulate and related pollutants and the AIR
TOXICS command to specify reporting of additional hazardous air pollutants.)
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Default: MOBILE6 calculates HC, CO, and NOX and writes results for these three
pollutants to any output files produced.
Explanation: The pollutant types are specified by the character strings HC, CO, NOx and CO2.
The three pollutant types may appear in mixed case, but each value must be
separated from the next by one or more blanks. If the users selects this command
but does not specify any pollutant then no results are produced for HC, CO, NOx,
or CO9.
Example: POLLUTANTS
2.8.3.2
: NOX CO
This input specifies that NOx and CO emissions will be reported and that HC and
CO2 emissions will not be reported.
Enable Calculation of Particulate Matter and Related Pollutants
Name:
PARTICULATES
Status:
Section:
Optional
Header
Description: This command enables the computation of particulate matter (PM) and related
emissions, and specifies which of these pollutants are calculated and reported.
Default: If this command is not used, then no parti culate matter or related pollutant results
are calculated.
Explanation: This command alerts the program that the user desires PM emissions to be
calculated and the results reported in the database and/or descriptive output. The
desired pollutants are specified by the character strings:
SO4
OCARBON
ECARBON
GASPM
LEAD
SO2
NH3
BRAKE
TIRE
Sulfate Portion of Exhaust Particulate Emissions
Organic Carbon Portion of Diesel Exhaust Particulate
Elemental Carbon Portion of Diesel Exhaust Particulate
Total Carbon Portion of Gasoline Exhaust Particulate
Lead Portion of Exhaust Particulate Emissions
Sulfur Dioxide Exhaust Emissions (gaseous)
Ammonia Exhaust Emissions (gaseous)
Brake-wear Particulate Emissions
Tire-wear Particulate Emissions
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The nine pollutant types may appear in mixed case, but each value must be
separated from the next by one or more blanks (not by commas). Pollutants which
are NOT listed are NOT calculated and reported, unless the command is specified
with no parameters, in which case all of the particulate emission factors are
calculated and reported.
Example: PARTICIPATES
ECARBON SO4 OCARBON TIRE
Tips:
2.8.3.3
Name:
Status:
Section:
Description:
This input specifies that paniculate calculations and output will be restricted to
the pollutants ECARBON, SO4, OCARBON and TIRE.
The PARTICULATES command is separate from the POLLUTANTS command
used to control the calculation of HC, CO and NOx emission results. (The syntax
of the POLLUTANTS command was not easily extended to a large number of
pollutants. Because EPA wanted MOBILE6.1 to be upward compatible with
MOBILE6.0 this command, which takes a somewhat different approach, was
added.)
Entry of Particulate Emission Factor Data
PARTICIPATE EF
Required if PARTICULATES Command is Specified.
Scenario
This command specifies the location of the data files that contain the particulate
emission factors. Six data files names and path names containing the particulate
emission factors are required following the PARTICULATE EF command. The
six files contain for all vehicle types and model years (1) the zero mile particulate
emission factors and values for age "X" (which is explained below), (2) the
deterioration estimates in terms of grams per mile per 10,000 miles of travel for
age 1 through age X, and (3) the deterioration estimates in terms of grams per
mile per 10,000 miles of travel for age X+l through age 25. There are three data
files for gasoline vehicles and three data files for diesel vehicles. The three
gasoline vehicle data files contain information for vehicle classes 1 through 13, 24
and 25. The three diesel vehicle files contain information for the remaining
vehicle classes. The data file names must be entered on the same line as the
PARTICULATE EF command. They must be entered in the order shown below,
and each file name must be separated by at least one space (See Example).
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Most users will want to use the six default paniculate emission factor files
provided with MOBILE6. In this case, the user need not learn the details of this
command, but just use the example provided below.
If the user is providing their own factors, it is important to note that the emission
factors for gasoline-fueled vehicles are in terms of GASPM only, while those for
diesel-fueled vehicles are in terms of total PM. All factors are expressed in terms
of total suspended particulate (PM30).
The user should also note that values entered into these files for diesel vehicle
model years greater than 2006 and gasoline vehicle model years greater than 2003
will have NO EFFECT on the results unless one or both commands 'NO TIER2'
(for gasoline vehicles) and/or 'NO 2007 HDDV RULE' (for diesel vehicles) is
also entered.
File Order in PARTICULATE EF Command
File 1: Gasoline Vehicle Zero Mile Level and value for X
File 2: Gasoline Vehicle Deterioration for Age 1 through Age X
File 3: Gasoline Vehicle Deterioration for Age X+l through Age 25
File 4: Diesel Vehicle Zero Mile Level and X, and diesel fuel sulfur levels
File 5: Diesel Vehicle Deterioration for Age 1 through Age X
File 6: Diesel Vehicle Deterioration for Age X+l through Age 25
PARTICULATE EF Data File Structure
File #1: Structure of Gasoline Vehicle Zero Mile Level
At the top of the file, or the first active record, the character string 'PMGZML'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The PMGZML string signals to the
MOBILE6.2 program that it is reading the gasoline vehicle zero mile particulate
emission factors.
The next input in the file is a record containing "X" values for each of the
gasoline vehicle classes. These are for vehicle classes 1 through 13, 24 and 25
(See Section 1.2.3, 'MOBILE6 Vehicle Classifications'). These inputs values for
"X" must be delimited by spaces or tabs.
The remaining records contain the basic zero mile emission factors. A complete
set of records must be supplied as contained in the default file PMGZML.CSV
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supplied with MOBILE6. The first four columns are 'key' fields that contain the
vehicle class number (1 through 28), the fuel toggle (leaded or unleaded), the
catalyst availability toggle (Yes, No or NA), and the air injection availability
toggle (Yes, No or NA). A value for 'Yes' means that a catalyst or air injection
system is available, a value of 'No' means that these systems are explicitly not
available, and a 'NA' means not applicable (i.e., catalysts were not available on
leaded fuel). The remaining columns provide the zero mile GASPM emission
factor for a given gasoline vehicle class for all model years 1950 through 2020.
The units of these emission factors are in grams per mile for all vehicle classes.
These values can be separated by commas or blanks. It should also be noted that
GASPM does not contain sulfate, gaseous SO2 or lead emissions.
File 2: Structure of Gasoline Vehicle Deterioration for Age 1 through Age X
At the top of the file, or the first active record, the character string 'PMGDR1'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The 'PMGDR1' string signals to the
MOBILE6.2 program that it is reading the gasoline vehicle deterioration rate
particulate emission factors for all vehicle ages from 1 to the age specified in
variable X. The values of "X" for gasoline vehicles are specified in File 1.
The remaining records contain the basic deterioration emission factors. The first
four columns are 'key' fields that contain the vehicle class number (1 through 28),
the fuel toggle (leaded or unleaded), the catalyst availability toggle (Yes, No or
NA), and the air injection availability toggle (Yes, No or NA). A value for 'Yes'
means that a catalyst or air injection system is available, a value of 'No' means
that these systems are explicitly not available, and a 'NA' means not applicable
(i.e., catalysts were not available on leaded fuel). The remaining columns
provide the GASPM emission deterioration rate for ages 1 through age X for a
given gasoline vehicle class for all model years 1950 through 2020. The units of
these emission factors are in grams per mile per 10,000 miles for all vehicle
classes. These values can be separated by commas or blanks. It should also be
noted that GASPM does not contain sulfate, gaseous SO2 or lead emissions.
File 3: Structure of Gasoline Vehicle Deterioration for Age X+l through Age 25
At the top of the file, or the first active record, the character string 'PMGDR2'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The 'PMGDR2' string signals to the
MOBILE6.2 program that it is reading the gasoline vehicle deterioration rate
particulate emission factors for all vehicle ages from age X+l to age 25.
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The remaining records contain the basic deterioration emission factors. These can
be separated by commas or blanks. The first four columns are 'key' fields that
contain the vehicle class number (1 through 28), the fuel toggle (leaded or
unleaded), the catalyst availability toggle (Yes, No or NA), and the air injection
availability toggle (Yes, No or NA). A value for 'Yes' means that a catalyst or air
injection system is available, a value of 'No' means that these systems are
explicitly not available, and a 'NA' means not applicable (i.e., catalysts were not
available on leaded fuel). The remaining columns provide the GASPM emission
deterioration rate for age X+l to age 25 for a given gasoline vehicle class for all
model years 1950 through 2020. The units of these emission factors are in grams
per mile per 10,000 miles for all vehicle classes. The use of this additional
deterioration file makes it possible to enter two different deterioration rates based
on vehicle age for a given vehicle type and model year. It should also be noted
that GASPM does not contain sulfate, gaseous SO2 or lead emissions.
File #4: Structure of Diesel Vehicle Zero Mile Level
At the top of the file, or the first active record, the character string 'PMDZML'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The PMDZML string signals to the
MOBILE6.2 program that it is reading the diesel zero mile particulate emission
factors.
The next set of inputs are the diesel fuel sulfur levels in units of parts per million
(ppm) on which the diesel vehicle emission factors are based. Separate diesel fuel
sulfur levels are entered in the file for each model year. This is necessary because
from a modeling perspective, it is now impossible to separate the emission factor
from its underlying fuel sulfur level. This is typically the sulfur level that the
underlying test vehicles used during the emission factor research and development
process. It is NOT necessarily the fuel sulfur level that will be modeled in a
MOBILE6.1 run. The default values in MOBILE6.1/6.2 are based on 500 ppm
diesel fuel sulfur. This value was chosen because it is prevailing fuel sulfur level
on which the original sulfate and gaseous SO2 emission factor tests are based.
The emission effects of lower or higher diesel fuel sulfur levels are computed
through adjustments to the 500 ppm base level. The only reason a user would
need to change this sulfur level input is if they are entering alternate total exhaust
particulate emission factors which are not based on tests using 500 ppm diesel
fuel sulfur. A complete set of records is required as contained in the default input
file PMDZML.CSV supplied with MOBILE6.
The next input in the file is a record containing "X" values for each of the diesel
vehicle classes. These are for vehicle classes 14 through 23 and classes 26
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through 28 (See Section 1.2.3 'MOBILE6 Vehicle Classifications' for the table
that describes vehicle class number). The input values for X must be delimited by
spaces or tabs.
The remaining records contain the total exhaust PM zero mile emission factors.
The first column is the 'key' field that contains the vehicle class number (14
through 23 and 26 through 28). The remaining columns provide the zero mile
total exhaust PM emission factor for a given diesel vehicle class for all model
years 1950 through 2020. The units of these emission factors are in grams per
mile for all vehicle classes.
File 5: Structure of Diesel Vehicle Deterioration for Age 1 through Age X
At the top of the file, or the first active record, the character string 'PMDDR1'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The 'PMDDR1' string signals to the
MOBILE6.2 program that it is reading the diesel vehicle deterioration rate
particulate emission factors for all vehicle ages from 1 to age X. The values of X
for diesel vehicles are specified in File 4.
The remaining records contain the total exhaust PM emission deterioration
factors. The first column is the 'key' field that contains the vehicle class number
(14 through 23 and 26 through 28). The remaining columns provide the total
exhaust PM deterioration rate for ages 1 through age X for a given vehicle class
for all model years 1950 through 2020. The units of these emission factors are in
grams per mile per 10,000 miles for all vehicle classes.
File 6: Structure of Gasoline Vehicle Deterioration for Age X+l through Age 25
At the top of the file, or the first active record, the character string 'PMDDR2'
must be present (rows that have the symbol '*' in the first column are not active,
but are used for documentation only). The 'PMDDR2' string signals to the
MOBILE6.2 program that it is reading the diesel vehicle total exhaust PM
deterioration rate particulate emission factors for all vehicle ages from age X+l to
age 25.
The remaining records contain the total exhaust PM emission deterioration
factors. The first column is the 'key' field that contains the vehicle class number
(14 through 23 and 26 through 28). The remaining columns provide the total
exhaust PM deterioration rate for age X+l to age 25 for a given vehicle class for
all model years 1950 through 2020. The units of these emission factors are in
grams per mile per 10,000 miles for all vehicle classes. The use of this
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Default:
Example:
deterioration file makes it possible to enter two different deterioration rates based
on vehicle age for a given vehicle type and model year.
PMGZML.CSV
PMGDR1.CSV
PMGDR2.CSV
PMDZML.CSV
PMDDR1.CSV
PMDDR2.CSV
Gasoline Vehicle Zero Mile Emission Levels
Gasoline Vehicle Deterioration Rates Age 1 through X
Gasoline Vehicle Deterioration Rates Age X through 25
Diesel Vehicle Zero Mile Emission Levels
Diesel Vehicle Deterioration Rates Age 1 through X
Diesel Vehicle Deterioration Rates Age X through 25
It is HIGHLY RECOMMENDED that the user does NOT modify the
contents of these data files, and uses the PARTICULATE EF command
ONLY in the form shown in the Example Section of this command. The files
referenced in the example are the default particulate emission factor data
files provided with the MOBILE6.1 model.
PARTICULATE EF :PMGZML.CSV PMGDR1.CSV PMGDR2.CSV
PMDZML.CSV PMDDR1.CSV PMDDR2.CSV
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Tips:
2.8.3.4
Name:
Status:
Section:
The PARTICULATE EF command has interactive effects with the commands
"NO TIER2" and "NO 2007 HDDV RULE". If these two commands are NOT
used, the PARTICULATE EF command will calculate the total exhaust
particulate emissions based on the user inputs, and compare them against the
Tier2 gasoline vehicle particulate standards and the 2007 model year heavy-duty
diesel particulate standards. If the program determines that the user based
emission factors are greater than the standards, then the program automatically
resets (caps) the exhaust particulate emission factors to the level of the applicable
standard.
If the NO TIER2 and/or NO 2007 HDDV RULE commands are specified by the
user, then the program does not check the user supplied emission factors against
the standard, and calculates exhaust particulate emissions by directly using the
user supplied particulate emission factors and in the case of the diesel vehicles,
the base fuel sulfur inputs (no emission cap is used).
If the user decides to modify the PM*.csv emission factor data files using
Microsoft Excel, they must edit the PM*.csv files using a text editor (i.e., Word
Perfect, Microsoft Word, VEDIT, WordPad, etc.) subsequent to its creation by
Microsoft Excel and prior to use by MOBILE6.1. The editor must add a 'Return'
character to the end of each data file. This is done by opening the data file with
the editor, placing the cursor after the very last column of the last row of data,
hitting the Enter or Return key, and saving the resulting files. Failure to do this
action will cause an error message when running the MOBILE6.1 program.
If this option is used, all diesel vehicle emission factor estimates (ZML and
deterioration) rates must be consistent with the fuel sulfur levels entered in the
PMDZML.CSV file. Failure to do this will lead to errors in the results.
Specify Upper Size Limit For Particulate Emissions
PARTICLE SIZE
Mandatory, if PARTICULATES command is used.
Scenario
Description: Allows the user to specify the maximum particulate size cutoff (PSC) that is used
by the model.
Default:
None
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Explanation: This command specifies the particle size cutoff value (PSC) in micrometers. The
emission factors reported for particulate pollutants represent the estimated grams
per mile of particles with aerodynamic diameters less than or equal to the PSC.
The maximum PSC allowed by the model is 10.0 micrometers, and the minimum
PSC is 1.0 micrometer.
Example: PARTICLE SIZE
Tips:
: 2.5
Particulate matter emissions are typically reported in terms of PM2.5 emissions (a
PSC of 2.5 micrometers) or PM10 (a PSC of 10.0 micrometers).
2.8.3.5 Hydrocarbon (HC) Emissions Speciation
NOTE: This section covers five commands with similar functions and requirements.
Name: (1) EXPRESS HC AS NMHC
(2) EXPRESS HC AS NMOG
(3) EXPRESS HC AS THC
(4)
(5)
Status:
Section:
EXPRES
EXPRES
Optional.
Run.
Description: These commands allow the user to specify the particular HC species that is
reported in the exhaust emission output.
Default: If the user does not enter a HC speciation command, MOBILE6 will report the
exhaust HC emissions in terms of volatile organic compounds (VOCs).
Explanation: MOBILE6 allows the user to choose one from among five options for reporting
HC emissions. These are detailed below:
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Includes Includes Includes Includes
Species FIDHC Methane Ethane Aldehydes
Total (THC) Yes Yes Yes No
Hydrocarbons
Non-methane (NMHC) Yes No Yes No
Hydrocarbons
Volatile Organic (VOC) Yes No No Yes
Compounds
Total Organic (TOG) Yes Yes Yes Yes
Gases
Non-methane (NMOG) Yes No Yes Yes
Organic Gases
In the table above, "FID HC" refers to the HC emissions as measured by the flame
ionization detector (FID) used in testing. The FID detects a portion of the aldehydes emitted by
the vehicle. Thus, the first two options above (THC and NMHC) account for a portion of
aldehyde emissions; the other options include a correction for that portion of aldehyde emissions
not registered by the FID. If speciation profiles are being applied to MOBILE6-based emissions,
consistency in HC definitions is important.
Only one of the HC speciation commands may be used in a single run. If the user
attempts to enter more, MOBILE6 will use the one that appears last. The only required
information for each of these five commands is the command name.
Emission testing of gasoline and diesel motor vehicles typically measures only THC
and/or NMHC. Natural gas vehicles are typically tested only for NMHC. In order to provide
estimates for the other "HC" outputs, MOBILE6 estimates other hydrocarbon species based on
the typical emissions composition of vehicles using gasoline and diesel fuels. Estimates of VOC,
THC, and TOG for fleets that include large fractions of natural gas-fueled vehicles may be
imprecise. In particular, the THC and NMHC outputs for natural gas vehicles should not be
subtracted from each other to estimate methane emissions, for example to estimate their global
warming gas emissions.
Example: EXPRESS HC AS NMHC :
EXPRESS HC AS NMOG :
EXPRESS HC AS THC :
EXPRESS HC AS TOG :
EXPRESS HC AS VOC :
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2.8.3.6 No Refueling Emissions
Name: NO REFUELING
Status: Optional
Section: Run
Description: This command directs MOBILE6 not to calculate the refueling emissions (also
referred to as Stage n emissions) from gasoline-fueled vehicles. Thus, the
composite hydrocarbon emissions reported to descriptive output will not include
refueling emissions.
Default: MOBILE6 reports refueling emissions if this command is not specified.
Explanation: The command name is the only required information.
Example: NO REFUELING :
Tips: The command should not be used if the user wants to model refueling emissions.
While the use of AP-42 gram/gallon factors in the past has been an alternative to
using MOBILE to calculate refueling emissions, this approach cannot give the
correct estimates for calendar years 1994 and later, due to the presence of
on-board vapor recovery systems on an increasing percentage of the in-use fleet
starting in that year. However, there may be reasons for users to have a separate
MOBILE6 run for determining refueling emissions, and excluding refueling
emissions from the runs used to determine other emission types.
2.8.3.7 Enable Calculation of Primary Air Toxic Pollutants
Name: AIR TOXICS
Status: Optional
Section: Header
Description: This command enables the computation of air toxic emissions and specifies
which of these pollutants are calculated and reported. This command cannot be
used in conjunction with the command FUEL PROGRAM set equal to '2' (RFG
program). This 'implicit' RFG program cannot be modeled with Air Toxic
emissions because the Air Toxic commands require more detailed and possibly
conflicting inputs. This command also cannot be used in conjunction with the
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OXYGENATED FUELS command. Instead, these fuel parameters must be
entered in the new command OXYGENATE.
Default: If the AIR TOXICS command is not used, then no air toxic pollutant results are
calculated.
Explanation: This command indicates that the program shall calculate and report air toxic
emission calculations. The selected air toxic pollutants are specified by character
strings.
BENZ
MTBE
BUTA
FORM
ACET
ACRO
Benzene
Methyl Tertiary Butyl Ether
1,3-Butadiene
Formaldehyde
Acetaldehyde
Acrolein
The six pollutant types may appear in mixed case, but each value must be
separated from the next by one or more blanks (not by commas). Toxic pollutants
which are NOT listed are NOT calculated and reported, unless the command is
specified with no parameters, in which case all of the air toxic emission factors
are calculated and reported.
If this command is specified then a number of additional commands are required
as described in section 2.8.10.7 to provide the additional fuel property information
needed to calculate these emissions.
Example: AIR TOXICS : BENZ ACET ACRO
This input specifies that the toxics calculations and output will be restricted to the
pollutants benzene, acetaldehyde and acrolein.
AIR TOXICS :
Tips:
This input specifies that the all six primary air toxic pollutants will be calculated
and reported.
The AIR TOXICS command is separate from the POLLUTANTS command used
to control the calculation of HC, CO and NOX emission results, and from the
PARTICULATES command which is used to control the calculation of the
various particulate emission factors.
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By using the three commands the user may specify that any combination of
pollutants be reported.
2.8.3.8 Input of Emission Factors for Additional (User-Defined) Air Toxic Pollutants
Name: ADDITIONAL HAPS
Status: Optional
Section: Scenario
Description: This command allows the user to enter emission factors or air toxic ratios for
additional air toxic pollutants. The program will read these additional emission
factors or ratios and calculate composite results for additional pollutants the user
may define.
Default: If this command is not specified, no additional air toxics are modeled.
Explanation: The additional emission factors must be input to the program in units of
milligrams per mile. The ratios are entered as ratios of the Air Toxic pollutant in
milligrams per mile to the Total VOC, Total TOG or Exhaust PM emission factor
(expressed in grams/mile).
The ADDITIONAL HAPS command parameter (see example) is the data file
containing the emission factor information for a given additional hazardous air
toxic pollutant. The data file must be in a delimiter-separated data file (*.CSV)
format. The delimiter may be a comma or a blank. The command
'ADDITIONAL HAPS' must appear in the first row and column of the file.
Subsequent rows can contain either non executable comments prefaced by a '*' in
the first column, or HAP emission factor data records.
The generalized input field structure of the HAP emission factor data file for a
given HAP pollutant is shown below. All of these fields are required for this
command except the DET field.
Poll # Poll Name Ekind Vtype Beg MY End MY Ratio/BEF ZML DET
Descriptions of these fields are as follows:
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Poll # This is the pollutant number. It must be an integer between 50 and
99. Any other values will produce an error message. The pollutant
number is an index number used by the program to keep track of
the pollutants throughout the calculations and output. The
pollutant number, not the Poll Name, will be used to track the
pollutant throughout the code.
Poll Name This is the name of the pollutant. Any name can be specified for a
pollutant as long as it is used consistently in all of the input
records. Since Poll # is used to track the pollutants in the code, this
input should only be viewed as a label for the input and output
reports.
Some examples of user-supplied pollutant names are:
Ethylbenzene
Naphthalene
n-Hexane
Styrene
Toluene
Xylene
Nickel Compounds
Arsenic Compounds
Manganese Compounds
Chromium Compounds
Mercury Compounds
Polycyclic Organic Matter (POM)
This is not a complete list. Note that these are in addition to the six
primary air toxic emission compounds which are built into
MOBILE6.2.
Ekind The text input 'EXH' or 'EVAP' is entered in this field to denote
whether the emission factor is associated with exhaust or
evaporative processes. All 'EVAP' exhaust air toxic emission
factors must be RATIO types. No BEF types will be allowed for
evaporative air toxic emission factors. (See the RATIO/BEF
command below). Note, a single evaporative ratio will be applied
to all evaporative emission etypes (hot soak, diurnal, resting loss,
etc.). There can be up to 50 user-defined air toxic pollutants.
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Vtype Vehicle type is indicated with an integer of 1 to 28. Air toxic
emission factors or ratios can be entered for any or all 28 vehicle
types. Section 1.2.3 lists the vehicle types by number.
Beg MY This field indicates the first model year for a particular air toxic
emission factor. It can range from 1951 through 2025 and is
entered as a four digit model year. The model year range
established by BEG MY and END MY for a pollutant must include
the complete 25 year range of model years needed to compute
emission factors for a given calendar year. For example, if the user
desires to model calendar year 2000, then Beg MY on at least one
record must be no later than 1975. The exception is that model
years prior to 1951 will use 1951 entries.
End MY This is the last model year of coverage for a particular air toxic
emission factor. It can range from 1951 through 2050, and the
input syntax is a four digit model year. The End MY on at least
one record for the pollutant must be equal to or later than the
calendar year which is being modeled. For example, if calendar
year 2000 is being modeled, then End MY can be 2000 or later.
Ratio/BEF This is a categorized field that accepts a test entry of
'RATIOVOC', 'RATIOTOG', 'RATIOPM' or 'BEF'.
'RATIOVOC' indicates an emission factor that is a fraction of the
VOC emissions. 'RATIOTOG' indicates an emission factor that is
a fraction of the TOG emissions. 'RATIOPM' indicates an
emission factor that is a fraction of the total exhaust PM.
If the user enters RATIOPM, then the P ARTICULATES command
must be specified so that the program will calculate total exhaust
particulate emission factors to use in calculating the Air Toxic
emission factor. An error message will result if there is a conflict.
If the user enters RATIOPM, then the P ARTICULATES command
must be specified so that the program will calculate total exhaust
particulate emission factors to use in calculating the Air Toxic
emission factor. An error message will result if there is a conflict.
Note that the user-specified particle size cutoff value is used to
calculate the PM emissions to which the HAP emissions are
ratioed.
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Example:
Tips:
2.8.3.9
Name:
Status:
Section:
ZML
DET
If the RATIO VOC, RATIOTOG or RATIO PM commands are
specified, then the user shall enter the appropriate fraction in the
Zero Mile Level (ZML) field.
If the user enters BEF, then the program shall read a zero mile
emission level and the deterioration rate for the pollutant. ZML
and DET.
This is a numeric field where either the air toxic emission fraction
is specified or the zero mile emission level in units of milligrams
per mile is specified.
This is a numeric field where deterioration rate emission level in
units of milligrams per mile per 10,000 miles is specified. It is
blank if the 'RATIO' is specified.
ADDITIONAL HAPS
:HAP BASE.CSV
The AIR TOXICS EF command could also be used to enter alternative emission
factors for the six primary air toxic pollutants (i.e., MTBE, Benzene, 1,3
Butadiene, etc.) if such information were available.
The ADDITIONAL HAPS command requires the user to specify the appropriate
vehicle class descriptive output command (See Section 2.8.4.3) if they want the
new HAP to be reported in the descriptive output. For example, if additional
HAP emission factors are entered for the light-duty gas truck three class
(LDGT3), the command EXPAND LDT EFS must also be issued to output the
results in the descriptive output. Otherwise, a value of 'NA' is reported in the
descriptive output. The user can also avoid this requirement by using the
SPREADSHEET command. It automatically reports the user defined HAPS
results for all vehicle classes.
Entry of Vehicle Fuel Economy Data
MPG ESTIMATES
Optional.
Scenario.
Description: This command allows the user to enter fuel economy performance data by vehicle
class and model year to replace the default values built into the model.
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Default: If this command is not specified then the default fuel economy values built into
the model are used.
Explanation: The command name should appear beginning in column 1 and be followed by a
colon in column 20. Its single parameter, beginning to the right of column 20 is
the name of an external data file containing alternative fuel economy information.
The first, non-comment, non-blank line of the external data file should contain the
command name.
28 non-comment lines must follow this initial line, one for each individual
MOBILE6 vehicle class. These 28 lines may be in any order.
Each of these lines or records should contain 100 numbers in comma-separated-
variable (.csv) format. The first number is a value from 1 thru 28 indicating the
MOBILE6 vehicle class to which the record applies. Values 2 thru 100 specify
the fuel economy performance of that vehicle class for model years 1952 thru
2050. (The 1952 value is used for model years prior to 1952.)
An example external data file for this command will be include in the model
distribution package.
Example: MPG ESTIMATES
Tips:
: MPG.CSV
This input specifies that alternative fuel economy data in the the external data file
MPG.CSV should replace the MOBILE6 default values.
This capability could be used to estimate the effect of the introduction into the
fleet of more fuel efficient vehicles.
Fuel economy values have a small effect on evaporative refueling losses and
sulfate paniculate emissions in addition to strongly affecting CO2 emissions.
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2.8.4 Descriptive and Spreadsheet Output Commands
2.8.4.1
Descriptive Output
Descriptive output commands allow users to specify the name and content of descriptive
output files.
2.8.4.1 .a Report (Descriptive Output) File
Name: REPORT FILE
Status: Optional.
Section: Header.
Description: This command identifies the descriptive output files. (Including the descriptive
output files for HC, CO, and NOx; PM and related pollutants; and air toxics.)
Default: Any HC, CO, and NOx output will be written to a descriptive file named with the
input file name root plus the extension, ".TXT". The default open action is
REPLACE. Any descriptive output report file for PM and related pollutants will
have the same filename root plus the extension ".PM".
Explanation: The file name is the only required data item for this record and can be placed
anywhere in the data field of the record. The user may provide a file name with an
explicit extension or with a period as the last non-blank.
An open action of APPEND or REPLACE may appear following the file name,
separated from it by one or more blanks. The APPEND action adds new modeling
results to a previously created report file of the same name. The REPLACE action
erases old results and replaces them with new ones. The open action may appear
in mixed case and may be abbreviated to a single character (e.g., A or R). The
default action, if none is specified, is REPLACE.
Example: REPORT FILE
feb02.txt
This example directs results to a descriptive output file for HC, CO, and NOx
results named "feb02.txt". Because no open action is specified, the MOBILE6
default open action would apply, and any previous modeling results in the file
would be replaced by the new ones. If a descriptive output file is produced for
particulates and related pollutants, its name will be "feb02.pm".
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2.8.4. l.b No Descriptive Output
Name: NO DESC OUTPUT
Status: Optional.
Section: Header.
Description: This command prevents MOBILE6 from producing any descriptive output.
Default: MOBILE6 produces descriptive output if this command is not specified.
Explanation: The only required information is the command name. When this command is
present, MOBILE6 will produce a text output file containing identifying
information (MOBILE6 version, input file, some run and scenario details) and
warning messages. However, the text file will not include scenario description
(calendar year, temperature, etc.) or emission data, and no .PM or .TOX file will
be produced.
If the user selects this command but does not request database or spreadsheet
output, the MOBILE6 run will terminate without generating emission factor
output.
Example: NO DESC OUTPUT :
2.8.4.l.c Expanding Vehicle Class Descriptive Output
NOTE: This section covers four commands with similar functions and requirements.
Name: (1) EXPAND BUS EPS
(2) EXPAND HDDV EF S
(3) EXPANDHDGVEFS
(4) EXPAND LOT EPS
Status: Optional.
Section: Run.
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Description: These four commands permit users to expand all three descriptive MOBILE6
outputs to include a more detailed breakdown of truck classes.
Default: MOBILE6 descriptive output reports emissions only in terms of the eight vehicle
category groups used in MOBILES. These are listed in Section 3.2.2.
Explanation: The command EXPAND BUS EPS causes MOBILE6 to report separate emission
results for gas bus, urban diesel bus, and diesel school bus categories.
The command EXPAND HDDV EPS causes MOBILE6 to report emissions
produced by heavy-duty diesels (HDDV) for each of the eight distinct HDDV
classes.
The command EXPAND HDGV EPS causes MOBILE6 to report emissions
produced by heavy-duty gasoline-fueled vehicles (HDGV) for each of the eight
distinct HDGV classes.
The command EXPAND LDT EPS causes MOBILE6 to report emissions
produced by light-duty trucks (LDT) for each of the six distinct LDT classes.
NOTE: The command name is the only required information for these commands. When
the commands that expand vehicle classes are selected along with other expansion commands
(e.g., EXPAND EXHAUST), expanded emissions will be reported for each vehicle subcategory
as well as for each subcategory of the other expand command.
Example: EXPAND BUS EFS :
EXPAND HDDV EFS :
EXPAND HDGV EFS :
EXPAND LDT EFS :
2.8.4.1 .d Expand Exhaust Emissions Descriptive Output
Name: EXPAND EXHAUST
Status: Optional.
Section: Run.
Description: This command directs MOBILE6 to display separate start, running, and total
(running + start) exhaust emission factors in the descriptive output for HC, CO,
and NOx, in addition to the composite emission factors.
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Default:
The default output displays only composite emission factors.
Explanation: Composite HC, CO, and NOx emissions are the sum of total exhaust emissions
plus evaporative emissions. Separate start and running emissions are not
calculated for particulate and toxic pollutants. These pollutants are not affected
by this command. The only required information for this command is the
command name.
Example: EXPAND EXHAUST :
2.8.4.1 .e Expand Evaporative Emissions Descriptive Output
Name: EXPAND EVAPORATIVE
Status:
Section:
Optional.
Run.
Description: This command directs MOBILE6 to display total non-exhaust emissions and the
six separate types of non-exhaust emissions in the HC, CO, and NOx descriptive
output, in addition to the composite emission factors.
Default:
The default HC, CO, and NOx output displays only composite emission factors.
Explanation: When the user selects this command, MOBILE6 will report separate emissions for
hot soak, diurnal, resting, running, crankcase, and refueling losses, as well as a
total for all those sources. The only requirement for this command is the
command name.
Example: EXPAND EVAPORATIVE :
2.8.4.l.f HD Diesel Idle Particulate Emission Report
Name: IDLE PM EMISSIONS
Status: Optional
Section: Run
Description: This optional command controls the output of 'Idle mode' particulate emission
factors for heavy-duty diesel vehicle classes 2b through 8b and diesel buses. It is
a simple yes/no toggle and it contains no parameters following the command.
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Default:
None
Explanation: This command allows users to obtain particulate emission factors that reflect
vehicle 'Idle' operation. If used, the output is reported only in the *.pm output
file, and in units of grams per hour of vehicle idle operation. The idle mode
particulate emission factors reflect total exhaust particulate, and are reported in an
output row following other particulate emission types. Idle mode particulate
emission factors are NOT reported in the SPREADSHEET output format.
Example: IDLE PM EMISSIONS :
Tips:
2.8.4.2
Name:
This command requires the user to specify the calculation of all the particulate
type pollutants. Thus, the PARTICULATE command should list no pollutants
following the colon (this tells the program to calculate all particulate pollutants).
Failure to observe this requirement will result in no idle mode output, and no
explicit error or warning message.
The term 'Idle' in this context refers to the mode of vehicle operation commonly
referred to as 'idling' or 'idle mode'. It does not explicitly model "hoteling"
behavior and should not be confused with the I/M program parameter known as
the'Idle Test'.
Only particulate emissions are reported in grams per hour units with this
command. If the user desires 'idle' emissions from other pollutants, they should
refer to Section 2.8.8.2.C and Section 2.8.8.2.d.
Spreadsheet Output
SPREADSHEET
Status: Optional
Section: Header
Description: This command instructs the MOBILE6.2 program to output the emission factors
in a form suitable for direct input into a spreadsheet such as Microsoft Excel or
Lotus 123. The results of the SPREADSHEET output are the same as those in the
description output files.
Default: If the SPREADSHEET command is not used, then spreadsheet output is not
generated.
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Explanation: This command allows the user to send the descriptive output results to a flat
(single sheet) data file that is TAB delimited and can be easily read by a
spreadsheet program such as Excel or Lotus 123. The '.tab' portion of the
filename suffix indicates that the output is a 'tab' delimited output file. This type
of output file generally can be read into Excel or Lotus 123 directly.
The information in the data file (spreadsheet output) is organized into spreadsheet
columns and spreadsheet rows. They have the following definitions.
Columns
The spreadsheet output consists of 60 individual columns of information. These
columns contain most of the information that is found in the descriptive output.
The first row of each column in the spreadsheet output contains the label for that
particular column. The structure of the columns and the column labels are as
follows:
Key (and alternate
key) fields:
Emissions:
Descriptive:
Columns 1 through 7 contain identifying information. In
order, these are: File number, Run number, Scenario
number, Calendar Year, Etype Number, Pollutant
Number, and Pollutant Name.
Columns 8 through 35 contain the emission results of a
given pollutant X for a given vehicle type. The header
row contains the names of the particular vehicle types.
All 28 vehicle types are present and ordered using the
same vehicle numbering system described in Section
1.2.3.
Columns 36 through 45 contain echoed input
information. In order, these include: Month, Altitude,
Min Temp, Max Temp, Nominal RVP, Gasoline Fuel
Sulfur, Diesel Fuel Sulfur, I/M Program Yes/No toggle,
Average Speed, and NGV Fraction Yes/No toggle.
Air Toxic:
Columns 46 through 58 contain echoed air toxic specific
inputs. In order, these are: E200, E300, Aromatics%,
Olefin%, Benzene%, MTBE Vol%, MTBE Market
Share, ETBE Vol%, ETBE Market Share, Ethanol Vol%,
Ethanol Market Share, TAME Vol%, and TAME Market
Share.
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Particulate: Columns 59 and 60 contain echoed particulate inputs. In
order, these are: Particle size and Scenario Descriptive
Field.
Rows
The rows of the spreadsheet output are identified by five key fields. These five
key fields serve in combination to uniquely identify a particular record.
1. File Number (FILE). The number of the command input file, beginning
with 1. Batch input files may contain more than one command input file.
2. Run Number (RUN). The run number within the input file, beginning with
1. Command input files may contain multiple runs.
3. Scenario Number (SCENARIO). The scenario number within the run,
beginning with 1. Runs may contain multiple scenarios. The calendar year
column is also shown in the index key section, but is not considered a
primary key because it is completely linked to the scenario number.
4. Emission Types (ETYPE).
VMT: For each File, Run and Scenario combination, the first row will
contain the Vehicle Miles Traveled distribution by vehicle class.
ETYPE 11 is available only the Spreadsheet Output.
1 & 2. Composite Start and Running Exhaust emissions.
3. Evaporative emissions from hot soak conditions.
4. Evaporative emissions from diurnal conditions.
5. Evaporative emissions from resting loss conditions.
6. Evaporative emissions from running loss conditions.
7. Evaporative emissions from crankcase emissions.
8. Evaporative emissions from refueling conditions.
9. Brake wear emissions.
10. Tire wear emissions.
11. Total evaporative emissions.
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5. All pollutants are available in the spreadsheet output format.
Pollutant Number
HC 1
CO 2
NOx 3
SO4 7
Ocarbon 8
Ecarbon 9
GASPM 10
Lead 11
Gaseous SO2 12
NH3 13
Brake 14
Tire 15
Benzene 16
Methyl Tertiary Butyl Ether 17
1,3-Butadiene 18
Formaldehyde 19
Acetaldehyde 20
Acrolein 21
All user defined pollutants can also be written to the spreadsheet output. These
are given pollutant numbers of 50 through 99. The pollutant number is used to
index the pollutant throughout the program. The Pollutant Name is merely a label
that may be attached for easy identification of the pollutant. If different labels are
assigned for the same pollutant number, then the last one entered will be the one
reported by the program.
Example: SPREADSHEET
This command instructs the MOBILE6 program to create a spreadsheet output file
with the prefix that is the name of the MOBILE6 command input file, and the
suffix is always '.TAB'.
The user can also enter an alternate name for the Spreadsheet following the colon
in column 20. For example:
SPREADSHEET :SACRAMENTO
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In this case, the program would produce a spreadsheet output called
'SACRAMEN.tab'.
Tips: The Spreadsheet output command creates a tab delimited output file that can be
read easily into a spreadsheet. It does NOT automatically create an actual Excel
or Lotus spreadsheet output file. Thus, the user cannot create this output type and
simply 'double click' on the file icon and expect it to automatically open into
Excel or Lotusl23. Instead, it must be imported into these applications as a tab
delimited file, or the .TAB suffix must be associated with the desired application.
2.8.5 Database Output Commands
Database output commands allow the user to specify the name, format, and content of the
database output file.
2.8.5.1
Control of Output in Database Form
NOTE: This section describes commands that permit users to obtain MOBILE6 output in
a database format and to limit the records in that database output. These limitations may be
critical because the hourly output from a single unlimited scenario will typically produce 217,800
records for exhaust emissions and another 78,000 records for evaporative emissions. This
requires about 35 megabytes per scenario. Users are advised to limit their output to only the
records necessary for their analyses.
2.8.5. La
Name: DATABASE OUTPUT
Status: Optional.
Section: Header.
Description: This command directs MOBILE6 to produce database output for all scenarios of
each run in the command input file.
Default:
MOBILE6 will not produce database output unless this command is selected.
Explanation: The command name is the only required information. The data field of this record
is not used and should be left blank.
Example: DATABASE OUTPUT :
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2.8.5.1.b
Name:
WITH FIELDNAMES
Status: Optional.
Section: Header.
Description: This command directs MOBILE6 to place a row of column names in the first row
of the database output table.
Default: The database output will contain only unlabeled values unless this command is
selected.
Explanation: The command name is the only required information. The data field of this record
is not used and should be left blank.
Tips:
Example:
2.8.5.J.C
Name:
Status:
Section:
This option is helpful for users who intend to export results to a spreadsheet. It is
also helpful for users who intend to export results to database applications capable
of handling text fields in the first row of a numerical table.
In general, the WITH FIELDNAMES command should be selected unless the
destination software requires a purely numerical table without field names.
WITH FIELDNAMES :
DATABASE OPTIONS
Optional.
Header.
Description: This command provides an alternate option for specifying the content and/or
format of database output. It allows users to place the commands listed in the
"explanation section" below in an external file rather than in the command input
file.
Default: Database output content and format is specified only through command input file
data.
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Explanation: This command specifies an external file that describes the desired database output
features. The file name can be placed anywhere in the data field of the record.
The first record in this external file must restate the name of this command,
DATABASE OPTIONS. The remainder of the file may contain the following
commands.
DATABASE AGES
DATABASE EMISSIONS
DATABASE FACILITIES
DATABASE HOURS
POLLUTANTS
DATABASE VEHICLES
DATABASE YEARS
DAILY OUTPUT
AGGREGATED OUTPUT
WITH FIELDNAMES
The external file contains the same information that the user would otherwise
specify in the command input file.
Example: DATABASE OPTIONS : C:\MOBILE\MOBILE6\DATA\DBASE.OPT
This example directs MOBILE6 to look for a file called "DBASE.OPT", which
contains one or more of the commands listed above.
Tip:
2.5.5.1. d
Name:
This command can be used to avoid having to respecify a frequently used set of
database options in multiple command input files.
DATABASE EMISSIONS
Status: Optional.
Section: Header.
Description: This command limits which of the ten potential types of emissions are reported.
Default: MOBILE6 will report all ten emission types unless this command is selected.
Explanation: MOBILE6 can report separate emissions for the following emission types:
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Exhaust Running Emissions
Exhaust Start Emissions
Evaporative Hot Soak Emissions
Evaporative Diurnal Emissions
Evaporative Resting Loss Emissions
Evaporative Running Loss Emissions
Evaporative Crankcase Emissions
Evaporative Refueling Emissions
Brake Wear Paniculate
Tire Wear Particulate
Example:
Tip:
Users specify whether they want to include each type of emission using an ordered
set of the digits ' 1' and '2'. AT means that the designated emission type should
not be included in the output, and a '2' means that it should be included. If the
user selects this command, a value (1 or 2) must be entered for at least the first
eight emission types in the order listed above.
The format specification requires values to be entered in two groups of four, plus
an optional group of two, and the groups must be separated by one or more blank
spaces. The values identifying emission types may be placed anywhere in the data
field. The only other requirement is the command name itself.
DATABASE EMISSIONS : 1221 1111 11
This example specifies that database output to the EMISSIONS database output
table should be restricted to records pertaining to the exhaust start and evaporative
hot soak emission types.
This option may alternatively be specified using the DATABASE OPTION
command described above.
2. S.S.l.e
Name:
Status:
Section:
DATABASE FACILITIES
Optional.
Header.
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Description: This command allows users to specify the roadway or facility types be to reported
in the database output table. It is most useful for modelers who wish to analyze
facility-specific emissions.
Default: MOBILE6 will report emissions for each facility type.
Explanation: This command directs MOBILE6 to report database output only for user-selected
roadway types. The command can take on five values, represented by character
strings. Four of the values, ARTERIAL, FREEWAY, LOCAL and RAMP,
represent specific facility or roadway types where emissions occur. The fifth
value, NONE, does not specify a specific facility type. Rather, it represents
emissions that occur independent of roadway type. These include engine start
emissions and all evaporative emissions except running losses.
One or more of these values can be listed in the data field of the DATABASE
FACILITIES command. The values may be in mixed case, but each value must be
separated from the next by one or more blank spaces. No abbreviations are
allowed for these values, and the character strings may appear anywhere in the
data field of the command. The only other required data is the command name.
Example: DATABASE FACILITIES: RAMP freeway None
This sample input specifies that database output should be restricted to the results
for the facility types RAMP and FREEWAY, and for engine start and evaporative
(except running loss) emissions.
Tips:
This option may alternatively be specified using the DATABASE OPTIONS
command described in Section 2.8.5.I.e.
The value "NONE" can be used to suppress reporting of all emission types other
than engine start and five of the six evaporative emission types. However, the
DATABASE EMISSIONS command offers a more straightforward way to
accomplish the same purpose.
This command should not be used in conjunction with the AGGREGATED
OUTPUT option.
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2.8.5.1J
Name: DATABASE VEHICLES
Status: Optional.
Section: Header.
Description: This command indicates which of the 28 individual vehicle types are reported.
Default: MOBILE6 reports records for all vehicle types in the database output file.
Explanation: Users can specify whether to include each type of vehicle through an off/on switch
indicated by the digits T or '2' respectively. AT means that the designated
vehicle type should not be included in the output, and a '2' means that it should be
included. If the user selects this command, a value (1 or 2) must be entered for
each vehicle type in the order listed below.
The vehicle types are specified by six groups of values. As detailed below, the
first group contains five values for each type of light-duty gasoline vehicles and
trucks (LDGVs and LDGTs); the second group contains eight values for the
heavy-duty gasoline vehicles (HDGVs); the third group is a single value for
motorcycles (MC); the fourth group contains three values for each type of
light-duty diesel vehicles and trucks (LDDVs and LDDTs); the fifth contains eight
values for the heavy-duty diesel vehicles (HDDVs); and the last group contains
three values for buses. Each group of values must be separated from the next by
one or more blank spaces.
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Vehicle Types Vehicle Class No.
Light-Duty Gasoline Vehicle 1
Light-Duty Gasoline Truck 1 2
Light-Duty Gasoline Truck 2 3
Light-Duty Gasoline Truck 3 4
Light-Duty Gasoline Truck 4 5
Heavy-Duty Gasoline Vehicle 2B 6
Heavy-Duty Gasoline Vehicle 3 7
Heavy-Duty Gasoline Vehicle 4 8
Heavy-Duty Gasoline Vehicle 5 9
Heavy-Duty Gasoline Vehicle 6 10
Heavy-Duty Gasoline Vehicle 7 11
Heavy-Duty Gasoline Vehicle 8A 12
Heavy-Duty Gasoline Vehicle 8B 13
Motorcycle (MC) 24
Light-Duty Diesel Vehicle 14
Light-Duty Diesel Truck 1 and 2 15
Light-Duty Diesel Truck 3 and 4 28
Heavy-Duty Diesel Vehicle 2B 16
Heavy-Duty Diesel Vehicle 3 17
Heavy-Duty Diesel Vehicle 4 18
Heavy-Duty Diesel Vehicle 5 19
Heavy-Duty Diesel Vehicle 6 20
Heavy-Duty Diesel Vehicle 7 21
Heavy-Duty Diesel Vehicle 8A 22
Heavy-Duty Diesel Vehicle 8B 23
All Gasoline Bus 25
Diesel Commercial Bus 26
Diesel School Bus 27
The only required data for this command are the command name and the string of
six groups of vehicle type flags, which can be placed anywhere in the data field.
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Example: DATABASE VEHICLES
21111 11111111 1 222 11111111 111
Tips:
2.8.5.J.g
Name:
Status:
Section:
Description:
Default:
This example specifies that database output should be restricted to records
pertaining to LDGVs, LDDVs, and both LDDTs categories.
This option may alternatively be specified using the DATABASE OPTIONS
command described in Section 2.8.5.I.e.
DATABASE AGES
Optional.
Header.
This command can limit which of the 25 vehicle ages are reported in the hourly or
daily database output formats.
If DATABASE OUTPUT has been requested and the AGGREGATED OUPUT
option has not been specified, MOBILE6 will report emissions for each of the 25
vehicle ages unless this command is selected.
Explanation: The hourly and daily forms of the database output produced by MOBILE6 report
emissions for AGE values 0 thru 24. The emissions are reported for yearly AGE
values starting with 24-year-old vehicles and ending with the calendar year of the
scenario (vehicle age of 0).
The DATABASE AGES command can be used to limit the reporting of emissions
to a single vehicle age or a range of vehicle ages.
Users can select a specific AGE value or range of AGE values by specifying a
start age and an end age. The order in which these two values are entered does not
matter. To specify a single vehicle age of interest, the age should be entered twice.
The format specification requires that the values entered are numbers from 0
through 24. The two numbers must be separated by a blank or a comma. If either
or both of the numbers are outside of the 0 to 24 range, the program will change
the upper and/or the lower limiting value(s) to 24 and/or 0, respectively. A
warning message is displayed on the screen to notify the user of the change. The
only other requirement is the command name itself.
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Example:
Tips:
DATABASE AGES : 5,1
This example specifies that database output to the daily or hourly database output
table should be restricted to records having AGE values of 1,2, 3,4, and 5 years
old.
This option may alternatively be specified using the DATABASE OPTION
command described in Section 2.8.5.I.e.
This command should not be used in conjunction with the AGGREGATED
OUTPUT option.
2.8.5. Lh
Name:
DATABASE HOURS
Status:
Section:
Optional.
Header.
Description: This command can limit which of the 24 hours are reported in the hourly format
of the database output.
Default: If DATABASE OUTPUT has been requested in the default hourly format,
MOBILE6 will report emissions for each of the 24 hourly intervals unless this
command is used.
Explanation: The hourly database output produced by MOBILE6 reports emissions for each
hour of the 24-hour day. (Hour number 1 is 6:00 a.m. to 7:00 am.)
This command can be used to limit which hours are reported by specifying a start
and an end value of HOUR. The start and end HOUR values may be specified in
either order.
The values entered must be numbers from 1 through 24. The two numbers must
be separated by a blank or a comma. If either or both of the numbers are outside of
the 1 to 24 range, MOBILE6 will change the upper and/or the lower limiting
value(s) to 24 and/or 1, respectively. A warning message is printed to the screen to
notify the user of the change. The only other requirement is the command name
itself.
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Example: DATABASE HOURS : 2,5
Tips:
This example specifies that database output to the hourly database output table
should be restricted to records pertaining to the HOUR values 2, 3, 4, and 5.
This option may alternatively be specified using the DATABASE OPTION
command described above.
This command should not be used in conjunction with the DAILY OUTPUT or
the AGGREGATED OUTPUT commands.
Name:
DATABASE YEARS
Status: Optional.
Section: Header.
Description: This command can limit which model years are reported in the hourly or daily
database output formats.
Default: If DATABASE output has been requested and the AGGREGATED OUTPUT
option has not been specified, MOBILE6 will report emissions for a 25 model
year range for each scenario, which is determined by the calendar year.
Explanation: The hourly and daily forms of the database output produced by MOBILE6 report
emissions for each of 25 model years. This model-year range spans from the
calendar year to 24 model years prior to the calendar year. The DATABASE
YEARS command can pick out a single or a group of model years from the set of
25 model years that are calculated.
Users can select a specific or a range of model year(s) by specifying a start model
year and an end model year. The order in which these two values are entered does
not matter.
The format specification requires the values entered be four-digit years that are
within the range of allowable model years (1928-2050). Values outside this range
are changed by the program to 1928 or 2050. The two numbers must be separated
by a blank or a comma. The only other requirement is the command name itself.
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Example: DATABASE YEARS : 1990,1989
Tips:
2.5.5.7.7
Name:
This example specifies that database output to the hourly or daily database output
table should be restricted to records pertaining to model years 1989 and 1990.
This option may alternatively be specified using the DATABASE OPTION
command described in Section 2.8.5.I.e.
This command should not be used in conjunction with the AGGREGATED
OUTPUT option.
DAILY OUTPUT
Status: Optional.
Section: Header.
Description: This command specifies that database output will represent daily rather than
hourly time periods.
Default:
MOBILE6 will report hourly time periods to the database output table.
Explanation: The command name is the only required information. The data field of this record
is not used and should be left blank.
Example:
Tips:
2.5.5. Lk
Name:
Status:
Section:
DAILY OUTPUT :
Daily output reduces the volume of reported output by a factor of about 30.
This option may alternatively be specified using the DATABASE OPTIONS
command described in Section 2.8.5.I.e.
AGGREGATED OUTPUT
Optional.
Header.
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Description: This command specifies that database output will represent daily rather than
hourly time periods and that it will be aggregated over age, facility (roadway)
type, and emission type for each vehicle class and pollutant. The emission types
included in the aggregation are controlled by user input.
This output option allows the user to obtain most of the aggregated numeric
values found in the descriptive output in a database format suitable for electronic
processing.
Default: MOBILE6 will report non-aggregated emission factors for hourly time periods to
the database output table.
Explanation: The command name is the only required information. The data field of this record
is not used and should be left blank.
Unlike the hourly and daily database output formats, the emission values within
the output produced by the aggregated format option are affected by other
database output options. This allows the user to specify which emission type
results are included in the aggregation. The following commands will affect the
emission result values:
NO REFUELING
DATABASE EMISSIONS
The NO REFUELING command will prevent the emissions reported from
including the portion from refueling. Similarly, the DATABASE EMISSIONS
command can eliminate the results for any of the emission type classifications
from the reported aggregated results. Because the user may affect the aggregated
emission values, caution should be used in selecting desired combinations. For
example, selecting only non-exhaust emission types will result in zero emissions
for database output lines referring to CO, NOX, and some paniculate and toxic
pollutants.
The DATABASE VEHICLES and POLLUTANTS commands can be used to
restrict the number of lines written to the database output file by restricting the
vehicle classes and pollutants to be written.
The DATABASE FACILITIES command has no effect on aggregated emissions
and will not restrict the emissions by roadway type. This may be done using the
VMT BY FACILITY command.
Example: AGGREGATED OUTPUT :
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Tips:
2.8.5.2
Name:
AGGREGATED OUTPUT reduces the volume of reported output to a maximum
of 84 lines per scenario.
Heavy-duty vehicles have no separate estimates for running and engine start
emissions. Any composite emission results that include running emissions will
include all exhaust emissions of heavy-duty vehicles. The same thing is true for
pollutants such as PM and toxics for all vehicle classes.
Database Output Files Identification
EMISSIONS TABLE
Status: Optional.
Section: Header.
Description: This command permits the user to name the database output file.
Default: Output will be written to a database table named with the input file name root,
plus the extension, ".TB1".
Explanation: The file name is the only required data item for this command and can be placed
anywhere in the data field of the record. The user may provide a file name with an
explicit extension, or with a period as the last non-blank character, if the user
wants to override the default naming convention.
An open action of APPEND or REPLACE may appear following the file name,
separated from it by one or more blanks. The APPEND action adds new modeling
results to a previously created report file of the same name. The REPLACE action
erases old results and replaces them with new ones. The open action may appear
in mixed case and may be abbreviated to a single character (e.g., A or R). The
default action, if none is specified, is REPLACE.
Example: EMISSIONS TABLE : C:\MOBILE6\TESTING2\TEST1B.TB1 REPLACE
This example directs MOBILE6 to write results to a table called, "TEST1B.TB1",
which is found in the C:\MOBILE6\TESTING2 folder. The REPLACE action
causes MOBILE6 to overwrite any previous modeling results found in that file.
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2.8.6. External Condition Commands
External condition commands allow users to specify the time frame, altitude, and weather
conditions they wish to model.
2.8.6.1 Calendar Year of Evaluation
Name: CALENDAR YEAR
Status: Required.
Section: Scenario.
Description: This command identifies the calendar year for which emission factors are to be
calculated, often referred to as "calendar year of evaluation."
Default: There is no MOBILE6 default. Users must supply this information.
Explanation: MOBILE6 can model emission factors for the calendar years 1952 to 2050,
inclusive. A four-digit value for the calendar year of evaluation must be entered
anywhere in the data portion of the record.
Example: CALENDAR YEAR : 2015
This input directs MOBILE6 to report emissions for the calendar year 2015.
2.8.6.2 Month of Evaluation (January or July)
Name: EVALUATION MONTH
Status: Optional.
Section: Scenario.
Description: This command provides the option of calculating emission factors for January 1 or
July 1 of the calendar year of evaluation.
Default: January or "1".
Explanation: MOBJLE6 allows the choice of January 1 or July 1. The specified month will
affect emission calculations in two ways: (1) by changing the composition of the
fleet (July 1 emission factors will reflect an additional six months of fleet
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Tips:
2.8.6.3
Name:
Status:
Section:
turnover, or replacement of older vehicles by new vehicles), and (2) by changing
how the effects of reformulated gasoline (RFG) are modeled. If the user selects
January 1, MOBILE6 will apply winter season RFG rules. If the user selects July
1, the model will apply summer season RFG rules (see Section 2.8.10).
To select July 1, enter a value of "7" anywhere in the data portion of the record.
To select January 1, the user can either enter a value of "1" or simply omit this
command. No other information is required except the command name.
Example: EVALUATION MONTH
This example directs MOBILE6 to produce emission results for July 1 of the
calendar year of evaluation.
The value of month is independent of temperature, fuel volatility, and other
inputs, which users still must select in a way that is consistent with the evaluation
month. Section 2.8.10.1 (FUEL PROGRAM) provides additional cautions
concerning evaluation month and its affect on Reformulated Gasoline.
It is possible to estimate the emission results for any evaluation date (month) by
mathematical interpolation between two MOBILE6 results. For example, using
the same input parameters, two MOBILE6 runs for January and July can be used
to estimate May 1st emissions, by weighting the January results by 0.333 and
weighting the July results by 0.667. Care should be taken to assure that both the
two runs use the appropriate parameters (i.e., temperature, fuels, etc.) and the in-
use programs that would apply on the target evaluation date. This may require the
use of the SEASON command if Reformulated Gasoline is being used (see FUEL
PROGRAM command).
Here is another example. If the January results are 56 grams/mile and the July
results are 50 grams/mile and the user needs results for May, then the user would
weight the January results by 2/6 and the July results by 4/6, giving the result of
52 grams/mile. This is intuitively the correct answer, since May is closer to July
than January and 52 is closer to 50 than 56.
Daily Temperature Range
MIN/MAX TEMPERATURE
Required, unless HOURLY TEMPERATURE command is selected.
Run or Scenario.
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Description: This command sets the minimum and maximum daily temperatures the user
wishes to model in a given run or scenario.
Default: There is no MOBILE6 default. Users must supply either daily minium and
maximum temperatures with this command, or 24 hourly temperatures with the
HOURLY TEMPERATURE command.
Explanation: MOBILE6 uses the minimum and maximum daily temperatures to perform
several calculations:
* Temperature corrections to exhaust HC, CO, and NOX (and indirectly to
HC-related air toxics).
* Diurnal, hot soak, running loss, and resting loss portions of evaporative
HC.
* Temperature of dispensed fuel to calculate refueling emissions.
Users must enter values for the minimum and maximum ambient temperatures
that they wish to model in a given run or scenario. The maximum temperature
cannot be lower than the minimum temperature, but the two values may be equal,
indicating no temperature change occurred during the entire day.
> The allowable minium temperature range is 0°F to 100°F (-18°C to 38°C).
» The allowable maximum temperature range is 10°F to!20°F (-12°C to
49°C).
If the user selects this command, MOBILE6 will calculate hourly temperatures
based on a typical pattern of temperatures during the day, given the maximum and
minimum values provided. This typical pattern will have the minimum
temperature occurring at 6 a.m., and the maximum at 3 p.m. This pattern does not
shift seasonally (i.e., no change for Daylight Saving Time).
The format for this command is the command name, followed by the minimum
and then the maximum temperatures in degrees Fahrenheit. Numbers representing
the temperatures must be separated by a blank space but may appear anywhere in
the data field of the record.
Example: MIN/MAX TEMPERATURE: 60. 84.
This input models a day in which the low temperature is 60°F and the high
temperature is 84°F.
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Tips:
2.8.6.4
Name:
Status:
Section:
Do not input separate hourly temperatures if minimum and maximum daily
temperatures are supplied. If the user does input both sets of temperatures,
MOBILE6 will use the set that appears last in the Scenario (or Run) section of the
command input file. If the times of day at which the minimum and maximum
temperatures occur are substantially different from the MOBILE6 defaults (6 a.m.
and 3 p.m.), then the user is advised to enter the hourly temperatures.
MOBILE6 will not correct for effects of fuel volatility (RVP) at very cold ambient
temperatures.
Ambient Temperature for Each Hour of the Day
HOURLY TEMPERATURES
Required, unless MIN/MAX TEMPERATURE command is selected.
Run or Scenario.
Description: This command allows users to enter temperatures for each hour of the day.
Default: There is no MOBILE6 default. If this command is not given, then the MIN/MAX
TEMPERATURE command must be used so that MOBILE6 can calculate hourly
temperatures based on a typical pattern of temperatures during the day.
Explanation: This command directs MOBILE6 to use the 24 values entered by the user to
calculate the minimum/maximum daily temperatures. Those temperatures will
then be used to calculate the hourly diurnal emissions, as described in Section
2.8.6.3. MOBILE6 will also perform hour-specific calculations with the specified
hourly values rather than with values calculated from a default temperature pattern
for all of the non-diurnal emissions described in the previous section.
This command requires the command name followed by the 24 hourly
temperatures in the data field. The temperatures must be listed beginning with 6
a.m. and continuing through 5 a.m. the next day (see Table 4, Appendix B). The
value input for a given time (e.g., 8 a.m.) is used by MOBILE6 for the hour
beginning at that time. The temperatures for each hour must be separated by a
blank space. The first 12 values must be on the same line as the command; the
remaining twelve must be on the next line.
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Example: HOURLY TEMPERATURES: 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0
75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0 75.0
This example would model a day in which the temperature remained 75°F for
every hour between 6 a.m. one day and 5 a.m. the next day.
Tips: Do not input daily minimum and maximum temperatures if hourly temperatures
are supplied. If both sets of temperatures are supplied, MOBILE6 will use the set
that appears last in the command input file.
2.8.6.5 Altitude
Name: ALTITUDE
Status: Optional.
Section: Scenario.
Description: This command indicates whether MOBILE6 will calculate emissions for a high-
or a low-altitude region.
Default:
Low altitude.
Explanation: MOBILE6 can calculate separate emission rates for high- and low-altitude
regions. Low-altitude emission factors are based on conditions representative of
approximately 500 feet above mean sea level. High-altitude factors are based on
conditions representative of approximately 5,500 feet above mean sea level. When
high-altitude region emission factors are requested, MOBILE6 also includes
vehicles that were built to meet specific high-altitude emission standards.
To select high altitude, enter a value of "2" anywhere in the data field. To select
low altitude, the user can either enter a value of "1" or simply omit this command.
No other information is required except the command name.
Example: ALTITUDE : 2
This example models a high-altitude area.
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2.8.6.6 Absolute Humidity
Name: ABSOLUTE HUMIDITY
Status: Optional.
Section: Run or Scenario.
Description: This command is used to specify a daily average for humidity.
Default: 75 grains per pound absolute or specific humidity.
Explanation: The humidity value affects NOx emissions. MOBILE6 also converts the specified
absolute humidity to relative humidity, which in turn is used to calculate a heat
index. The heat index affects the portion of the vehicle fleet that MOBILE6
determines is using air conditioning, thereby affecting CO, HC, and HC-related air
toxics emissions.
This command requires one value in the data portion of the record that represents
the absolute humidity in grains of water per pound of dry air. The value must be
between 20.0 and 528.0.
Example: ABSOLUTE HUMIDITY : 115.0
This example models a day in which the absolute humidity is 115 grains per
pound.
Warning: MOBILE6 does not check that the absolute humidity value and the temperature
range yield a relative humidity which does not exceed 100 percent.
2.8.6.7 Environmental Effects on Air Conditioning
The information provided by the commands in this section is used by MOBILE6 to model
the extent of vehicle air-conditioning usage.
2.8.6.7.a
Name:
CLOUD COVER
Status: Optional.
Section: Run or Scenario.
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Description: This command allows users to specify an average percent cloud cover for a given
day. This feature affects only the air conditioning correction.
Default: Zero percent.
Explanation: The CLOUD COVER command requires one value in the data portion of the
record that signifies the average fraction of cloud coverage. This value must be
between 0.0 and 1.0, inclusive.
Example: CLOUD COVER : 0.90
This example models a day in which the cloud cover is 90 percent.
2.8.6.7.b
Name:
PEAK SUN
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to specify the midday hours when the sun is at peak
intensity. This feature only affects the air-conditioning correction.
Default: 10 a.m. for start of peak sun and 4 p.m. for end of peak sun.
Explanation: The PEAK SUN command requires two integers in the data portion of the record.
Peak sun is applied as a range by virtue of the fact that the intensity of solar load
is roughly within 5 percent of maximum solar load (noon) for several hours
throughout mid-day, depending on the season. The default times span the range
of this condition for early summer conditions; in considering changes to the
default values, the user should evaluate data on direct solar radiation, commonly
available through NOAA's Surface Radiation (SURFRAD) monitoring system
(http://www.srrb.noaa.gov/surfrad/surfpage.htm). It is important to note that air
conditioning adjustments are also applied at times outside the peak sun range, but
at a lesser magnitude per the reduced solar load.
The first peak sun integer represents the beginning of peak sun, and the second
integer represents the end of peak sun. The first value (beginning of peak sun)
must be no earlier than 9 a.m. The second value (end of peak sun) must be no later
than 5 p.m. The integers must be separated by one or more blank spaces.
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Example: PEAK SUN
10 4
2.8.6.7.c
Name:
This example would model a day in which the peak sun occurs between 10 a.m.
and 4 p.m. These are also the default hours.
SUNRISE/SUNSET
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to specify the time of sunrise and sunset. This feature
affects only the air-conditioning correction.
Default:
6 a.m. for sunrise and 9 p.m. for sunset.
Explanation: The SUNRISE/SUNSET command requires two integers in the data portion of the
record. The first one represents the hour of sunrise, and the second represents the
hour of sunset. The first value (sunrise) must be between 5 a.m. and 9 a.m. The
second value (sunset) must be between 5 p.m. and 9 p.m. The integers must be
separated by one or more blank spaces.
Example: SUNRISE/SUNSET : 6 9
This example would model a day in which the sunrise occurs at 6 a.m. and the
sunset occurs at 9 p.m. These are also the default hours; thus, alternatively, the
modeler need enter only the command name to achieve the same modeling result.
Tip:
2.8.6.8
Name:
Status:
Section:
Ambient
RELATD
Optional.
Scenario.
Although most of the units for time of day (in MOBILE6) count from 6 a.m., both
of the preceding commands (SUNRISE/SUNSET and PEAK SUN) use the
traditional clock time (counting from midnight).
Ambient Relative Humidity for Each Hour of the Day
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Description: This command is used to specify hourly relative humidity values and allows the
user to relate these relative humidity values directly to the hourly temperature
values(see also the BAROMETRIC PRES command).
Default: A specific humidity value of 75 grains per pound which is independent of the
MOBILE6 temperature.
Explanation: The humidity input directly affects NOx emissions through a humidity correction
factor for NOx emissions.
The humidity value also affects the MOBILE6 air conditioning (A/C) correction
factors for HC, CO, and NOx emissions. This is done in MOBILE6 by
calculating a heat index with the relative humidity inputs. The heat index is used
in conjunction with vehicle A/C usage statistics to calculate the air conditioning
correction factors.
The RELATIVE HUMIDITY command directs MOBILE6 to use the 24 values of
relative humidity entered by the user. MOBILE6 will perform hour-specific
calculations with the specified hourly values rather than use the single default
value of absolute humidity. In particular, the hourly relative humidity values
together with hourly temperature values and barometric pressure (see also the
BAROMETRIC PRES command) are used to calculate hourly absolute humidity
values. Subsequently, hourly humidity effects on NOx emissions can be
determined. Also, the hourly relative humidity values are used directly to
determine hourly heat indices which are used to determine the air conditioning
effects on HC, CO, and NOx emissions.
This command requires the command name followed by the 24 hourly relative
humidity values in the data field. The relative humidity values are to be input in
percentages. The values must be listed with the first hour beginning at 6 a.m. and
continuing through 5 a.m. the next day (see Table 4, Appendix B). The relative
humidity for each hour must be separated by a blank space. The first 12 values
must be on the same line as the command; the remaining twelve must be on the
next line. Each value must be between 0.0 and 100.0 percent.
Example: RELATIVE HUMIDITY : 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55.
55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55.
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The example above models a day in which the relative humidity is 55% for every
hour between 6 a.m. one day and 5 a.m. the next day.
2.8.6.9 Barometric Pressure
Name: BAROMETRIC PRES
Status: Optional (can only be used in conjunction with the RELATIVE HUMIDITY
command)
Section: Scenario.
Description: This command is used to specify a daily average barometric pressure.
Default: 29.92 inches of mercury (Hg).
Explanation: When the RELATIVE HUMIDITY command is used, the user supplied relative
humidity values are converted to absolute humidity. This conversion requires
values of temperature and barometric pressure. The BAROMETRIC PRES
command allows the user to change the default value of barometric pressure used
in the humidity conversion.
This command requires one value in the data portion of the record that represents
the barometric pressure in inches of mercury. The value must be between 13.0 and
33.0 inches of mercury.
Example: RELATIVE HUMIDITY : 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55.
55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55. 55.
BAROMETRIC PRES : 30.0
The example above models a day in which the barometric pressure is 30.0 inches
of mercury and for each hour of the day has a relative humidity value of 55%.
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2.8.7 Vehicle Fleet Characteristic Commands
Fleet characteristic commands allow users to describe a given fleet by vehicle age, power
source, and activity level. Several of these commands involve vehicle age. In MOBILE6, vehicle
age always involves a 25-year range, with vehicles 25 years and older grouped together. The
range may be expressed as 0 to 24 years (age = calendar year - model year); alternatively its
values may be considered to range from 1 to 25 years (age = calendar year - model year +1).
Calendar year is the year being modeled and may vary by MOBILE6 scenario.
2.8.7.1 Distribution of Vehicle Registrations
Name: REG DIST
Status: Optional.
Section: Run.
Description: This command allows users to supply vehicle registration distributions by vehicle
age for any of the 16 composite (combined gas and diesel) vehicle types.
Default: MOBILE6 applies a registration distribution for each of the 16 composite vehicle
types based on U.S. vehicle fleet data. Technical report, M6.FLT.007, contains
these default age distributions.
Explanation: MOBILE6 users may specify vehicle registration data for each of 25 vehicle ages
for one or more of the 16 composite vehicle types listed in Table 1, Appendix B.
This command requires an external data file. The command line in the command
input file contains the command and external data file names. The format for the
external data file is as follows:
» The first line contains the command name.
> The next line contains the composite vehicle type followed by 25 age
fractions, representing the fraction of vehicles of that age in that composite
vehicle class in July. MOBILE6 will use these fractions directly if a July
evaluation date is requested or will convert them to January if the user
requests that evaluation date.
* This line is repeated for any vehicle categories the user wishes to specify
(override the MOBILE6 default).
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» The vehicle type is represented by an integer from 1 to 16. See Table 1,
Appendix B for the number associated with each of the 16 composite
vehicle types.
» The vehicle age fractions are represented by decimals (0.000 through
1.000) for each of the 25 model years, starting with the youngest. The last
fraction represents vehicles aged 25 years and older in the fleet being
modeled.
The values may appear in any row with as many characters as needed, as long as
25 values follow the integer value and each value is separated by at least one
blank space. Comment lines may not appear within the lines containing the 25
values for each vehicle class. However, comments may occur between the data for
each vehicle class. The data for the vehicle classes may occur in any order and not
all vehicle classes must be entered. However, all 25 values of the distribution
must be entered for any vehicle class.
The sum of the 25 values should equal 1.0. If they do not, MOBILE6 outputs a
warning message.
Example: REG DIST
: REGDATA.D
In this example, the external file named, "REGDATA.D", contains the user-
supplied age distributions. Below is an example of an external data file for this
command:
REG DIST
* LDV
1 0.0530
0.0689
0.0458
0.0114
* LDT1
2 0.0581
0.0693
0.0372
0.0085
0.0706 0.0706 0.0705 0.0703 0.0698
0.0676 0.0655 0.0627 0.0588 0.0539
0.0363 0.0288 0.0228 0.0181 0.0144
0.0090 0.0072 0.0057 0.0045 0.0036 0.0102
0.0774 0.0769 0.0760 0.0745 0.0723
0.0656 0.0610 0.0557 0.0498 0.0436
0.0309 0.0249 0.0195 0.0147 0.0107
0.0081 0.0078 0.0075 0.0072 0.0069 0.0359
The sample external data file starts with the REG DIST command name followed
by a comment line (denoted by a '*' character). The next four lines contain the 25
registration-by-age fractionsarranged in three lines of six and one line of seven
and following the integer ' 1'for light-duty vehicles. The last four lines present
similar information for the composite vehicle category LDT1.
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2.8.7.2 Diesel Fractions
Name: DIESEL FRACTIONS
Status: Optional.
Section: Run or Scenario.
Description: This command permits users to supply locality-specific diesel fractions for 14 of
the 16 composite vehicle categories by vehicle age.
Default: MOBILE6 assigns default diesel fractions for all model years. Please see the
technical report, M6.FLT.007, for the specific gasoline/diesel splits for 1972
through 1996 model years.
> 1971 and earlier model years are assumed to have the same diesel fraction
as the 1972 model year.
> 1997 and later model years are assumed to have the same diesel fraction as
the 1996 model year.
Explanation: Diesel fractions allow MOBILE6 to perform separate calculations for gas and
diesel subcategories, which have distinctly different emission rates. Urban/transit
buses are assumed to be all diesel-fueled, and motorcycles are assumed to be all
gasoline-fueled, so these two categories do not require a diesel fraction. That
leaves 14 composite vehicle categories for which users can specify a diesel
fraction.
The diesel fraction represents the percent of diesels in a composite vehicle
category for any vehicle age. The model year that MOBILE6 applies to each value
depends on the calendar year of evaluation. This means that the user must provide
separate input for each calendar year to be modeled. MOBILE6 assumes that all
non-diesel vehicle sales are gasoline-fueled vehicles.
If the user selects this command, diesel fractions must be provided by age of
vehicle and for each of the 14 composite vehicle types. With 14 vehicle categories
and 25 vehicle ages, the user needs to enter 350 separate diesel fractions. The user
must provide separate input for each scenario to run multiple calendar years.
The format for this command is as follows:
The 350 diesel fractions immediately follow the command name within the
MOBILE6 command input file. The values are entered in free column format,
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with one or more blank spaces separating each numerical value. The data must be
ordered in terms of 14 groups of 25 values (representing vehicle ages) by
composite vehicle type in the order presented in Table 2, Appendix B.
Within each vehicle class, MOBILE6 reads the 25 diesel fractions by age in order
from the youngest to the oldest. The numbers may appear in as many rows as
desired, with as many values in each row as desired, as long as the values appear
in the proper sequence. No comments may appear between the rows containing
the diesel fraction values. All values entered must be less than or equal 1 and
greater than or equal 0.
Example: DIESEL FRACTIONS :
The command name would be followed by 350 decimals representing the 25
diesel fractions for each composite vehicle category. The file named,
"DIESFRAC.DEF", contains a complete example.
Tip: The data may be included in the Run section if all scenarios have the same
calendar year.
2.8.7.3 Annual Mileage Accumulation Rates
Name: MILE ACCUM RATE
Status: Optional.
Section: Run.
Description: This command allows users to supply the annual mileage accumulation rates by
vehicle age for any or all of the 28 individual vehicle types.
Default: A default set of rates, based on U.S. fleet data, is described in technical report,
M6FLT.007.
Explanation: The mileage accumulation rate represents the total annual travel accumulated per
vehicle of a given age and individual vehicle category. The user does not need to
enter mileages for all categories. MOBILE6 will apply default values for any
vehicle type that the user does not specify.
The format for the external data file for this command is as follows:
* The first line contains the command name.
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The next lines contain the vehicle type and mileage accumulation data.
The vehicle type is represented by the number associated with each of the
28 individual vehicle types listed in Table 3, Appendix B. That value is
followed by the mileage accumulations for each of the 25 ages, starting
with the youngest. These values are input as miles divided by 100,000
(e.g., 12,000 miles is input as 0.12000).
The above item is then repeated for each individual vehicle type for which
the default distribution will not be used.
Example: MILE ACCUM RATE
: miledat.d
2.8.7.4
Name:
This example directs MOBILE6 to look for an external file named, "miledat.d",
which contains the command name followed by mileage accumulation rates. A
complete example is contained in the file, "MARDATA.DEF".
Vehicle Miles Traveled (VMT) Fraction
VMT FRACTIONS
NOTE: This command is cross-listed below under commands covering activity. Please
see Section 2.8.8.1 for detailed information.
2.8.7.5 Natural Gas Vehicles (NGVs) Fraction
Name: NGV FRACTION
Status: Optional.
Section: Run.
Description: This command is used to indicate the percent of vehicles in the fleet certified to
operate on (not retrofitted for) either compressed or liquefied natural gas.
Default: The fraction of NGV vehicles in the fleet is zero.
Explanation: This command allows the user to specify the percent of NGVs in each of the 28
individual vehicle classes beginning with the 1994 model year. If the user enters
100% NGV, MOBILE6 will report the basic NGV emission rate. Any other
percentage will specify a fleet that is part NGV, with gasoline and diesel vehicles
comprising the remaining part of the fleet.
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Tips:
2.8.7.6
Name:
Status:
Section:
The NGV FRACTION command also affects evaporative emissions, which
MOBILE6 assumes are zero for NGVs. Thus, if the user enters 5 percent for the
NGV penetration of a particular gasoline vehicle class, MOBILE6 will assume
that 5 percent of that class will have zero evaporative emissions.
The NGV FRACTION command requires an external file containing the NGV
fractions for each vehicle type and model year from 1994 through 2050. The
external file must contain the command name NGV FRACTION at the top of the
file starting in column 1. The command name must be followed by 28 separate
blocks of NGV fractions, one for each vehicle class. These are in order by vehicle
class number. Fractions must be provided for all 28 vehicle classes. Each block
contains 57 values of NGV fleet penetration percentages. Each block must contain
a value for all 57 calendar years. The values can range from 0.0000 to 100.0000.
Each value must be separated from the next value by a blank space. Blank rows
and comment rows can be added to the external NGV data file prior to the data
blocks or between data blocks, but not inside the individual data blocks.
Example: NGV FRACTION
: ngvfr.d
This example directs MOBILE6 to look up NGV fractions in an external file
called, "ngvfr.d". A sample file will be distributed with MOBILE6.
Although the command name uses the word fraction, the input values must be
percentages.
The percentage of NGVs in the fleet is very small. MOBILE6 provides this option
for special cases in which it is necessary to model the effects of NGVs on a small
percentage of the fleet, or to generate the basic NGV emission factors by entering
100 percent penetration.
Alternate Emission Factors for Natural Gas Vehicles (NGVs)
NGVEF
Optional.
Run.
Description: This command allows the user to enter alternate NGV emission factors for each of
the 28 vehicle types, for HC, CO, and NOx. Where applicable this is done in
terms of both running and start emissions. This label can only be entered if the
corresponding NGV FRACTION command has also been entered to signal to the
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MOBILE6 model that the user wants to model the effects of NOV. Note that the
PM emissions of NGVs are calculated based on those of gasoline-fueled vehicles,
so no provision, apart from the PARTICULATE EF command, is made to enter
alternative PM emission factors for NGVs.
Default: None
Explanation: The NGV EF command allows the user to enter separate NGV emission factors
for each of the 28 vehicle types, for HC, CO, and NOx. Where applicable this is
done in terms of both running and start emissions. It does NOT allow the user to
specify an NGV emission factor for a particular model year. The NGV emission
factor specified by the user for a particular vehicle class and pollutant will be
applied to all 1994 and later model years that are specified to contain natural gas
vehicles. Model year specification is accomplished through the use of the NGV
FRACTION command.
The NGV basic emission factor data are entered in an attached data file (i.e.,
ngvefZ.d). The external data file must contain the keyword "NGV EF" at the top
of the data file starting in column 1. The user is not required to enter a value for
all of the 28 vehicle types. For instance, the user may enter NGV emission factors
for only one vehicle type. This multi-line input consists of the following two
parts:
The first line starting with column 1 contains the label name ("NGV EF").
All subsequent data records contain the following six pieces of information (all
numbers):
The first number is the two-digit integer associated with the desired vehicle type
(IVs). The same vehicle class numbering system is used here as in other sections
elsewhere in this model.
The second number is the one digit integer (II) associated with the pollutant. A ' 1'
is entered for HC, a '2' is entered for CO and a '3' is entered for NOx.
The third number on the NGV EF record is the one-digit integer specifying
emissions from the operating modes of running = 1 or start = 2 (where
applicable). For the eight light-duty vehicle types (IV = 1-5, 14,15, 28), start and
running emissions are calculated separately; for the remaining 20 vehicle types,
only composite values are calculated.
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Tips:
ISR
1
2
Vehicle Operation
"Running" (only where IV = 1-5, 14,
28), otherwise "composite."
"Start" where applicable (only where
5, 14, 15, or 28).
15, or
IV =1-
The fourth number is a decimal number indicating the zero-mile emission level
(ZML) of the normal emitters.
The fifth number is a decimal number indicating the increase in emissions
(deterioration) of the normal emitters per 10,000 miles.
The sixth (and last) number is a decimal number indicating the average emission
level of the high emitters. The model only uses this value for the eight light-duty
vehicle types; however, the program expects to find all six numbers on each
record. The program will crash if this number is missing (even if the number will
not be used). For the 20 heavy-duty classes, the user must enter a zero for the
sixth value.
Example: NGV EF
ngvef2.d
This example directs MOBILE6 to look up NGV emission factors in an external
file called, "ngvef2.d". A sample file will be distributed with MOBILE6.
This command was developed to allow users to modify the default NGV emission
factors in the MOBILE6.0 model. This might be important because only limited
data were available to develop the default NGV emission factors, and because
rapidly changing NGV emission technology may make these default settings
obsolete in the future.
It should also be noted that the default NGV emission factors for 2004 and later
model years are actually higher than the corresponding emission factors for Tier2
gasoline vehicles. This is probably not a realistic assumption; thus, any NGV
emission modeling of 2004 later calendar years should probably utilize this
command to enter alternate and more accurate NGV emission factors.
2.8.8 Activity Commands
Activity commands allow users to allocate vehicle travel by time of day, day of week,
type of road, speed, and other factors that affect emissions.
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2.8.8.1 Fractions of Vehicle Miles Traveled (VMT)
Name: VMT FRACTIONS
Status: Optional.
Section: Run or Scenario.
Description: This command and the three that follow, along with the mileage accumulation rate
option, allow users to supply vehicle travel data specific to the geographical
location they wish to model. The VMT FRACTIONS command allows users to
allocate VMT to specific vehicle types. The VMT fractions are used to weight
together the emissions of the various vehicle types into the average emissions for
groupings of vehicle classes, such as the "HDGV" and "All Veh" categories in the
descriptive output.
The VMT FRACTIONS command should be used to properly model any situation
in which the local mix of the 16 combined vehicle types differs from the national
average.
Default: MOBILE6 calculates a default VMT mileage distribution from national average
data and/or user-supplied information, specifically:
1. The calendar year of evaluation.
2. Default vehicle population data for the 16 (See Table 1, Appendix B)
composite vehicle classes.
3. Default or user-supplied vehicle registration by age distribution data.
4. Default or user-supplied diesel fractions.
5. Default or user-supplied mileage accumulation data.
The default data for items 2 through 5 are described in technical report,
M6.FLT.007. Note that MOBILE6 users are not allowed to change data item 2 as
such; this command is provided instead. Note also that the total vehicle
population, per se, is not significant in MOBILE6 because all emission results are
expressed on a per-vehicle-mile basis. Therefore, only the fraction of vehicles of
each age and class actually affects the results.
Explanation: The VMT mix specifies the fraction of total highway VMT that is accumulated by
each of the 16 composite vehicle types.
Each VMT mix supplied as input must consist of a set of 16 fractional values,
representing the fraction of total highway VMT accumulated by each of 16
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Example:
2.8.8.2
2.8.8.2.a
Name:
combined vehicle types. All values must be between 0 and 1, and the 16 values
must add up to 1.0. MOBILE6 produces an error message and does not execute
the run if these constraints are not met.
This command requires a free column format consisting of 16 fractions (values
from 0.000 to 1.000) with one or more spaces between fractions. The 16 values
represent the distribution of all VMT by each of the 16 vehicle classes.
The order in which the numbers are presented is critical. The values must be
entered in the order presented in Table 1, Appendix B.
This command must appear in the scenario section if different VMT mixes are to
be applied to each scenario, but can appear in the Run section if the same VMT
mix is to be applied to all scenarios.
VMT FRACTIONS :
0.354 0.089 0.297 0.092 0.041 0.040 0.004 0.003
0.002 0.008 0.010 0.012 0.040 0.002 0.001 0.005
This example shows the command name plus two lines of data providing VMT
fractions for the 16 vehicle categories. Another example is contained in the file
called, "VMTMDCDEF".
VMT By Facility, Hour and Speed
VMT BY FACILITY
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to allocate VMT to various roadway or facility types
by vehicle class.
Default: MOBILE6 uses national estimates of the distribution of VMT by facility type.
The default values are the same for every vehicle type. The MOBILE6 technical
report, M6.SPD.003, provides an explanation of the methodology used to generate
these default values.
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Explanation: The VMT BY FACILITY command allows users to enter VMT distributions for
each of the 28 vehicle classes across four roadway types for each of the 24 hours
of the day. These data must be entered in an external data file, which contains the
VMT BY FACILITY command name in the first column of the first row.
Following the command name, the user must enter the vehicle class number
(ranges from 1 to 28) and the 96 VMT fractions representing the fraction of travel
on each roadway type at each hour of the day for that vehicle class. The user is
permitted to enter VMT fractions ( in blocks of 96 VMT fractions) for any
individual vehicle class, or for any number of vehicle classes up to 28 classes. A
vehicle class number must precede the block of VMT fractions. If the user
chooses to enter VMT fractions for less than all of the 28 vehicle classes, the
program will use default VMT fractions for the vehicle classes unspecified by the
user.
For a given vehicle class, the VMT fractions must be entered as 24 values for each
successive hour of the day starting with 6 a.m. (see Table 4, Appendix B). There
must be four sets of 24 values corresponding to the four facility types, and the four
sets must be entered in the following order: freeway, arterial, local, and ramp.
Within the external file, the input may appear in free column format, but at least
one space must separate each numerical value. The distributions for each hour
must add up to 1. If they do not, MOBILE6 will automatically normalize them.
Example: VMT BY FACILITY : FVMT.def
This example directs MOBILE6 to look up an external file called, "FVMT.def,
which contains the VMT distributions by facility. A sample file by this name will
be distributed with MOBILE6.
Tips:
The MOBILE6 default for this input is the same for every vehicle type. For
example, in default runs, heavy-duty trucks have the same VMT distribution by
roadway as passenger cars. If VMT by roadway distribution data is available by
vehicle class, this command allows the user to supply the appropriate VMT
fractions.
Also, the name used for this command and the two that follow could lead to a
misinterpretation of their function. This command requires the user to provide
fractional values for the four roadway types at each of the 24 hours of the day for
a given vehicle class. Because the total VMT within each hour varies across the
day, the input fractions will not add up to the fraction of daily VMT on each
roadway type.
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2.8.8.2.b
Name:
The data in this command and the VMT BY HOUR command can be multiplied
(outside of MOBILE6) to obtain the distribution of VMT during the 24 hours of
the day and for each facility type.
VMT BY HOUR
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to allocate the fraction of VMT that occurs at each
hour of the day.
Default: MOBILE6 uses national data for the default distribution of VMT by hour, as
described in technical report, M6.SPD.003.
Explanation: This command permits the user to allocate total VMT among the 24 hours of each
day. The values for the command are independent of facility type, that is, the
VMT fraction covers all facility types.
The format for this command calls for an external file, which contains the VMT
BY HOUR command name as its first entry, starting in the first column of the first
row. This must be followed by the 24 VMT fractions, one value for each of the 24
hours of the day. At least one space must separate each numerical value.
The 24 values must add up to 1. If they do not, MOBILE6 will automatically
normalize them.
Example: VMT BY HOUR
: HVMT.def
2.8.8.2.c
Name:
Where the external file named, "HVMT.def', has as its first entry: VMT BY
HOUR. A sample file by this name will be distributed with MOBILE6.
SPEED VMT
Status: Optional.
Section: Run or Scenario.
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Description: This command allows users to allocate VMT by average speed on freeways and
arterial roads.
Default: MOBILE6 uses national fleet data for the default distribution of VMT by average
speed for freeways and arterial roadways, as described in technical report,
M6.SPD.003.
Explanation: The SPEED VMT command name permits the user to enter the VMT distribution
over preselected average speed ranges. MOBILE6 calculates these distributions
for each of the 24 hours of the day and for freeways and arterials (producing 48
separate distributions, each containing 14 fractions). The data in this array are not
sufficient to estimate either hourly VMT distribution or the VMT distributions by
facility type.
This command requires an external data file that must contain the following
information in a multiline record:
> The first line contains the command name ("SPEED VMT").
» Each of the next 48 lines contain:
First, an integer for facility type, where "1"= freeway and "2"=
arterial.
Second, an integer for hour of the day (1 through 24), with 6 a.m. =
CC -I }}
The next 14 numbers represent VMT fractions in each of the 14
average speed categories.
The 14 average speed fractions (0.0000 through 1.0000) must add up to 1. The
first of the 14 preset speeds is "idle," and the other 13 average speeds range from
5 mph to 65 mph in 5 mph increments. Table 5 in Appendix B describes in more
detail the average speed ranges represented by each speed bin.
This pattern must be repeated for each combination of roadway type (arterial and
freeway) and time of day to create the 48 lines. Distributions must be entered for
all facility types and hours.
Example: SPEED VMT
: SVMT.def
This example references data stored in the external file named, "SVMT.def,
which has the SPEED VMT command name as its first entry, followed by the 48
VMT distributions (one for each combination of the two facility cycles and each
of the 24 hours of the day). The file will be distributed with MOBILE6.
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2.8.8.2.d
Name:
AVERAGE SPEED
Status: Optional.
Section: Scenario.
Description: This command allows users to designate a single average speed to use for all
freeways and/or arterial/collectors for the entire day.
Default: MOBILE6 uses national fleet data for the default distribution of VMT by average
speed for freeways and arterial roadways, as described in technical report,
M6.SPD.003, or a user supplied VMT by average speed distribution provided
using the SPEED VMT command.
Explanation: The SPEED VMT command permits the user to replace the default values with a
VMT distribution over fourteen average speed bins. However, in some modeling
situations the user may wish to enter a single value instead of a distribution. For
example, the user may need to model roadway links separately, or may not have
the VMT distribution information. In these cases, MOBILE6 can be used to
calculate results for a single specified average speed. The AVERAGE SPEED
command automatically replaces the SPEED VMT and VMT BY FACILITY data
files with the appropriate average speed and facility type information for a single
average speed. (All of the functions of the AVERAGE SPEED command can be
duplicated using the SPEED VMT and VMT BY FACILITY commands, if
desired. These calculations are discussed in Chapter 5.)
The AVERAGE SPEED command includes up to six data elements. The first two
of the data elements are required. The elements must be entered on the command
line. The data elements are:
Average speed
Roadway scenario
Distribution of VMT by facility (4 values)
Each element is described in detail below.
* Average speed value (2.5 to 65 miles per hour).
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As with all average speed inputs to MOBILE6, the allowed user supplied
average speed value may range from 2.5 through 65 miles per hour. Any
integer or decimal value in that range may be used.
Indication of the roadway scenario the user wishes to model (choose one):
Non-Ramp All VMT occurs on freeways, not including freeway
ramps,
Freeway All VMT occurs on freeways, including freeway
ramps,
Arterial All VMT occurs on arterial/collector roadways, or
Areawide VMT occurs on all roadway types as determined by
the VMT BY FACILITY command or the using
national average defaults. Note: "Areawide" must
be spelled as a single word.
The roadway scenario indicates the type of driving that the user intends for
the average speed input to model. (Note: the average speed used for local
roadways and freeway ramps cannot be changed by the user.)
Non-Ramp
The "Non-Ramp" roadway scenario assigns all VMT to the freeway
roadway type, with the VMT automatically distributed among two average
speed bins (see Chapter 5) which average to the single average speed
indicated by the user. No freeway ramp driving is included in the
estimate. The VMT from freeway ramps and all the other roadway types
is set to zero for all hours of the day.
Freeway
The "Freeway" roadway scenario assigns all VMT to either the freeway or
the freeway ramp roadway types. If the user does not specify the
distribution of VMT by facility, the national average fraction of freeway
ramp activity (8% freeway ramp and 92% non-ramp freeway) is used.
Freeway ramps have a constant speed of 34.6 mph, which cannot be
changed by the user. A single average speed for the non-ramp freeway
VMT is calculated using the fixed freeway ramp average speed and the
freeway ramp VMT fraction such that the combined ramp and non-ramp
average speed matches the average speed value entered by the user. All of
the non-ramp freeway VMT is then automatically distributed among two
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average speed bins which average to the calculated average non-ramp
freeway speed.
While the MOBILE6 model checks that the AVERAGE SPEED input
is between 2.5 and 65 mph, the FREEWAY option does not issue a
warning if the calculated non-ramp freeway speed falls outside these
limits. The user must take care that the model not calculate emissions
for freeway speeds outside this range.
For the default freeway ramp fraction (8%), the maximum combined non-
ramp freeway and ramp average speed in MOBILE6 is 60.73 mph. For
speeds above 60.73, the MOBILE6 emission values will be incorrect.
Similarly, with 8% freeway ramps, the minimum combined non-ramp
freeway and ramp average speed is 2.71 mph. For speeds below 2.71
mph, the MOBILE6 emission values will be incorrect.
For other fractions of freeway ramp VMT, the minimum and maximum
combined non-ramp and ramp average speed for the AVERAGE SPEED
FREEWAY option can be calculated using the following equations:
Max Freeway Average Speed = l/((l/65)*(l-RampVMT)+(l/34.6)*RampVMT)
Min Freeway Average Speed = l/((l/2.5)*(l-RampVMT)+(l/34.6)*RampVMT)
If it is necessary to estimate emissions outside the allowed range for
Freeway Average speed, the emissions should be estimated as equal to the
emissions at the minimum or maximum described above.
Arterial
The "Arterial" roadway scenario assigns all VMT to the arterial/collector
roadway type with a single average speed as indicated by the user. The
VMT from the other roadway types is set to zero for all hours of the day.
Areawide
When the user indicated the "Areawide" roadway scenario, MOBILE6
selects a single average speed for the freeway roadway type and a single
average speed for the arterial/collector roadway type such that the
combined average speed for all roadway types (including local roadways
and freeway ramps) will match the average speed value entered by the
user. If the user does not specify the distribution of VMT by facility
(described below), the national default distribution (34.2% freeway, 49.8%
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arterial/collector, 13% local, 3% freeway ramp) is used. This same
distribution of VMT by facility is used for all hours of the day for all
vehicle types.
Since the freeway ramp and local roadway speeds are fixed, MOBILE6
may not be able to model the average speed indicated by the user if the
average speed desired is too high or too low. In these cases a calculated
maximum speed or a calculated minimum speed is substituted for the user
supplied average speed and a warning, indicating the actual average speed
used, is written to the descriptive output.
» Distribution of VMT by facility to be used (optional). Four values:
Fraction of VMT which occurs on freeways (non-ramp),
Fraction of VMT which occurs on arterial/collector roadways,
Fraction of VMT which occurs on local roadways, and
Fraction of VMT which occurs on freeway ramps.
The effect of entering an areawide average speed or an average speed on
freeways, including ramps, will depend on the distribution of VMT by
facility (roadway type). If the user does not specify the distribution of
VMT by facility, the national average distribution is used to calculate the
appropriate VMT by facility:
34.2% (freeway)
« 49.8% (arterial/collector)
13.0% (local)
> 3.0% (freeway ramp)
The user may override these values by entering four new values in the
order indicated above. The sum of the four values must equal 1.0 or
100(%). All four values must be entered. The entry of any distribution of
VMT by facility values, either using the VMT BY FACILITY command
or as part of the AVERAGE SPEED command, has no effect when the
user selects either a "freeway" or an "arterial" roadway scenario, since in
these cases, all VMT is assigned to either the freeway roadway type or the
arterial/collector roadway type, respectively.
Be aware that using the AVERAGE SPEED command will override the default
and user supplied distribution of VMT by facility values used to calculate the
results. The same distribution of VMT by facility values is used for all hours of
the day for all vehicle classes. Similarly, the same average speed is used for every
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Tip:
Note:
2.8.8.3
Name:
Status:
Section:
hour of the day. Since other factors, such as temperature, vary across the day, the
composite results shown in the descriptive output is the VMT weighted daily
average emission rate at that average speed.
Example: AVERAGE SPEED
25.3 Arterial
This example sets the average speed for all arterial/collector roadways at all hours
of the day to 25.3 miles per hour and assigns 100% of VMT to the
arterial/collector roadway type. This command will override the use of the
SPEED VMT and VMT BY FACILITY commands.
Example: AVERAGE SPEED
: 48.3 freeway 92.0 0.0 0.0 8.0
This example sets the combined average speed of freeways and freeway ramps to
48.3 mph. The four values following the indication of roadway scenario are the
distribution of VMT by facility to be used. They show 92% of VMT on freeways
and 8% VMT on freeway ramps (the default). (Freeway ramps have a fixed speed
of 34.6 mph in MOBILE6 so the non-ramp freeway average speed is adjusted
accordingly, to 50.0 mph.)
Since the effects of speed on emissions is not linear, using a single average speed
will not produce the same emission result as the weighted results of a number of
separate MOBILE6 runs with different average speeds. If the composite
emissions of multiple roadways with different speeds are to be calculated, a
MOBILE6 run using a distribution of average speeds should be used. However, it
is appropriate to use the AVERAGE SPEED command to generate a single
average speed result to represent similar roadways with similar average speeds
(i.e., a lookup table).
The AVERAGE SPEED command does not bypass the MOBILE6 average speed
bins. Instead, the model calculates an appropriate distribution of average speeds
across two average speed bins to match the user-specified average speed. That is,
this command simply automates the methodology described in Chapter 5.
Starts Per Day
STARTS PER DAY
Optional.
Run.
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Description: This command allows users to specify the average number of engine starts (trips)
per vehicle per day for specific vehicle classes and ages for weekend days and/or
weekdays.
Default: MOBILE6 assigns each of the 28 individual vehicle classes at each of 25 ages a
separate default for number of engine starts per day. The defaults differ for
weekdays and weekends. Light duty passenger vehicles use 7.28 starts per day for
weekdays and 5.41 starts per day for weekend days. Light trucks use 8.06 starts
per day for weekdays and 5.68 starts per day for weekend days. Motorcycles use
1.35 starts per day for both weekend and weekdays. Heavy duty gasoline vehicles
and buses use 6.88 starts per day for both weekend and weekdays. Heavy duty
diesel vehicles and buses use 6.65 starts per day for both weekend and weekdays.
The same default value is used for vehicles of all ages within a vehicle class.
Please see the technical report, M6.FLT.003 for more details.
Explanation: The number of starts per day affects engine exhaust start emission estimates for
light duty gasoline and diesel passenger cars and trucks and motorcycles. It will
also affect the evaporative hot soak losses on all gasoline fueled vehicles,
including heavy duty vehicles and buses, which occur at trip ends. The number of
trips per day and trip ends per day is calculated from the number of starts per day.
Emission estimates for heavy duty diesel fueled vehicles and buses are not
affected by the number of starts per day in MOBILE6. We recommend that users
not include engine starts per day values for heavy duty diesel vehicles and busses
in their external data files. The following table indicates the vehicle classes
affected by the number of engine starts per day and the appropriate vehicle class
number. Only these vehicle classes are affected by use of the STARTS PER DAY
command in MOBILE6.
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Vehicle Classes Affected By the STARTS PER DAY Command
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
24
25
28
Abbreviation
LDGV
LDGT1
LDGT2
LDGT3
LDGT4
HDGV2B
HDGV3
HDGV4
HDGV5
HDGV6
HDGV7
HDGV8A
HDGV8B
LDDV
LDDT12
MC
HDGB
LDDT34
Description
Light-Duty Gasoline Vehicles (Passenger Cars)
Light-Duty Gasoline Trucks 1 (0-6,000 Ibs. GVWR, 0-3750 Ibs. LVW)
Light-Duty Gasoline Trucks 2 (0-6,000 Ibs. GVWR, 3751-5750 Ibs. LVW)
Light-Duty Gasoline Trucks 3 (6,001-8,500 Ibs. GVWR, 0-5750 Ibs. ALVW)
Light-Duty Gasoline Trucks 4 (6,001-8,500 Ibs. GVWR, 5751 Ibs. and greater ALVW)
Class 2b Heavy-Duty Gasoline Vehicles (8501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Gasoline Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Gasoline Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Gasoline Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Gasoline Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Gasoline Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Gasoline Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Gasoline Vehicles (>60,000 Ibs. GVWR)
Light-Duty Diesel Vehicles (Passenger Cars)
Light-Duty Diesel Trucks 1 and 2 (0-6,000 Ibs. GVWR)
Motorcycles (Gasoline)
Gasoline Buses (School, Transit and Urban)
Light-Duty Diesel Trucks 3 and 4 (6,001-8,500 Ibs. GVWR)
The user may replace values for as few or as many of these vehicle classes as
needed. An external file that includes new engine starts per day values for all of
the affected vehicle classes for a given day type will require 450 values (25 ages
times 18 vehicle classes), meaning 900 values are needed to replace all of the
affected default values for both weekend and weekdays.
The values for this command must be entered in an external data file. The first
entry in the external file must be the command name, "STARTS PER DAY,"
starting in the first column of the first row of the file. This entry is followed by an
indication of whether the user supplied values are applied to weekend or
weekdays, the vehicle class number and a set of 25 starts per day values, one for
each vehicle age. A single user supplied external data file may contain both
weekend and weekday entries.
The order in which the numbers appear is critical. The first value indicates
whether the engine starts per day values apply to weekday (1) or weekend (2)
days. The next value indicates the vehicle class. These are the same values
indicated in the above table and in Table 3, Appendix B. The next 25 values are
the average number of engine starts per day by vehicle age, beginning with age 0
ending with age 24. Because each value is an average, it may be other than a
whole number and may be less than 1. No value for the number of engine starts
per day may be less than zero or greater than 100. This set of values may be
followed by another set of values for another day type or vehicle class. The
vehicle classes and day types do not need to be entered in any particular order.
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However, if the user inadvertently enters engine starts per day for the same
vehicle class and day type twice, only the second entry will be used, without a
warning to the user.
As long as the user enters the values in the required order, and each value is
separated by a delimiter character such as a blank space, any format may be used.
For example, the user may enter all 27 values (day type, vehicle class and 25 age
values) on one line, divide them into two lines of 14 and 13 values, and so on.
User entry of values for starts per day is invoked using the STARTS PER DAY
command in the input file, including the name (and directory path) for the data file
containing the starts per day values.
Example: STARTS PER DAY
: STARTSPD.D
Where the user supplies an external data file named, "STARTSPD.D". An
example external data file for the STARTS PER DAY command might be:
STARTS PER DAY
10
6
3 9.8 9.3 8.9 8.4 8.0 7.6 7.2 6.9 6.5
2 5.9 5.6 5.3 5.1 4.8 4.6 4.4 4.2 3.9
3.8 3.6 3.4 3.2 3.1
10.3 9.8 9.3 8.9 8.4 8.0 7.6 7.2 6.9 6.5
6.2 5.9 5.6 5.3 5.1 4.8 4.6 4.4 4.2
3.8 3.6 3.4 3.2 3.1
3.9
Tip:
In this example, the number of engine starts per day for weekdays (1) for the
gasoline passenger car vehicle class (1, LDGV) and the gasoline light-duty trucks
less than 6,001 Ibs. GVWR and less than 3,751 Ibs. LVW (2, LDGT1) is set.
The 25 age values range from 10.3 engine starts per day for vehicles of age 0 to
3.1 engine starts per day for vehicles of age 24. The default engine starts per day
values will be used for all other vehicle classes and for LDGV for weekend days.
The values are presented in three lines for each vehicle class/day type.
It is generally best to enter values with logical groupings and spacings that, in this
case, for example, would easily distinguish one vehicle class from another. If
Saturday and Sunday are different enough to be treated separately, two separate
runs with their own weekend day values could be used.
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November 4, 2002
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2.8.8.4 Distribution of Vehicle Starts During the Day
Name: START DIST
Status: Optional.
Section: Run.
Description: This command allows users to allocate engine starts by hour of the day.
Default:
Default values are explained in technical report, M6.FLT.003.
Explanation: The START DIST command allows users to change the default values for the
hourly distribution of engine starts (trips) across the day. Users must supply 48
values to replace the MOBILE6 defaults. Each value represents the average
fraction of all engine starts that occur in each hour of a 24 hour day, for both
weekdays and weekends. All values must be less than or equal to 1 and greater
than or equal to zero. The sum of all of the 24 values for a day must equal 1. If
they do not, MOBILE6 will normalize the values to 1 without issuing a warning.
The values for this command must be entered in an external data file. The first
entry in the external file must be the command name, START DIST, placed in the
first column of the first row of the file. This entry is followed by the 48 values
described above.
The order in which the 48 values appear is critical. The first 24 values must be the
temporal distribution for a weekday. The second 24 values represent the weekend.
The data for the 24-hour periods must be entered in the order presented in Table 4,
Appendix B.
As long as the user enters the values in the required order and separates the values
with a delimiter character such as a blank space, any format may be used. For
example, the user may enter all 48 values on one line, divide them into two lines
of 24, and so on.
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November 4, 2002
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Example: START DIST : SDIST.D
Where the external data file named, "SDIST.D", contains the following records:
START DIST
0.020 0.055 0.060 0.047 0.052 0.067 0.081 0.073
0.080 0.090 0.084 0.077 0.060 0.014 0.014 0.014
0.014 0.014 0.014 0.014 0.014 0.014 0.014 0.014
0.010 0.019 0.031 0.065 0.069 0.080 0.102 0.073
0.089 0.074 0.080 0.071 0.061 0.016 0.016 0.016
0.016 0.016 0.016 0.016 0.016 0.016 0.016 0.016
Tips:
In this example, the first 24 values (for a weekday) are contained in the first three
lines, followed by the weekend values in the second three lines. This entry would
direct MOBILE6 to allocate 2 percent of weekday starts to the time period
between 6 a.m. and 6:59 a.m., and 1 percent of weekend starts to the same time
period.
As with the other external data files, users may enter comment lines (i.e., lines
beginning with an asterisk "*") between the Header line and the block of data.
However, with this command, users should not enter comment line(s) within the
numerical data.
2.8.8.5
Soak Distribution
Name:
SOAK DISTRIBUTION
Status: Optional.
Section: Scenario.
Description: This command allows users to enter vehicle soak duration distributions that
override MOBILE6 defaults. The soak time affects exhaust start emissions.
Default: Default information is provided in technical reports, M6.FLT.003, and
M6.FLT.004.
Explanation: A vehicle is considered to be "soaking" if its engine is not running. Soak time is
the length of time between when an engine is turned off and the next time it is
started. MOBILE6 uses soak time data to determine, for each hour of the day, the
percentage of vehicles that have been soaking for a given amount of time prior to
an engine start. This, in turn, affects start emissions, which depend on the length
-118-
November 4, 2002
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of soak time. The same soak time distributions are applied to all vehicle classes
and all vehicle ages.
The SOAK DISTRIBUTION command name requires the user to enter values for
each of the 70 soak durations for each of the 24 hours of the day for week and
weekend days (3,360 values). The 70 soak duration values correspond to specific
soak length intervals as defined in the table below. The 70 values for each hour
must add up to 1. This information must be located in an external data file.
The external data file must first index the 24 hours and then the 70 soak times.
That is, the first 24 values are the soak time distribution values for only the first
soak time interval. The second set of 24 values are for the second soak time
interval, and onward until all 70 sets of 24 soak time intervals have been included.
The first of each set of 24 values is for the first hour (6 a.m. to 6:59 a.m.) through
hour 24 (5 a.m. to 5:59 a.m.). The soak time intervals are:
Interval Number Interval range flSHnterval number)
1 (Greater than . 01) to 1.0 minutes
2 to 30 (Greater than N-l) to N minutes
31 to 45 (Greater than 2N-32) to (2N-30) minutes
46 to 67 (Greater than 3 ON-13 20) to (3 ON-1290) minutes
68 Greater than 720 minutes
69 (Greater than zero) to . 1 minutes (Restarts)
70 Zero Minutes (Stalls, not used)
Once the weekday values have been entered, the weekend day values must be
entered using the same format used for the weekday values.
The data values themselves are read from an external file in free column format.
The fractions may occur in any column of the file, as long as each value is
separated from other values by a space. For example, the 3,360 values could be
entered on 140 lines (with 24 values on each line) or on 280 lines (with 12 values
on each line).
-119- November 4, 2002
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Example: SOAK DISTRIBUTION : SOAKDST.D
Where the external file, "SOAKDST.D", has the command name as its first entry.
SOAK DISTRIBUTION
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
24*0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
24*0.
.0 24*0.0 24*0.57
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.43 24*0.0 24*0.0
.0 24*0.0 24*0.57
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.0 24*0.0 24*0.0
.43 24*0.0 24*0.0
2.8.8.6
Name:
In this example, the notation "24 * x" represents 24 values of x. The distribution
of soak times is the same on the weekend as on weekdays, and it is the same for
every hour of the day. In the example, 57 percent of the soak times are between 9
and 10 minutes long, and 43 percent are greater than 720 minutes (12 hours). Each
of the 48 sets of 70 values add up to 1.
Hot Soak Activity
HOT SOAK ACTIVITY
Status: Optional.
Section: Scenario.
Description: This command allows users to specify a hot soak duration distribution for each of
14 daily time periods.
Default: Please see technical reports, M6.FLT.003, and M6.FLT.004, for further
information. Sample files containing default values will be distributed with
MOBILE6.
HSACTDAY.D:
HSACTEND.D:
weekday rates
weekend rates
Explanation: Hot soak emissions occur when fuel vapors escape from a hot vehicle that has just
been turned off. The emissions are highest immediately after the engine is shut
down and decrease over time, reaching a baseline level in about an hour. Hot soak
-120- November 4, 2002
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emissions are truncated if the engine is turned on again before the baseline has
been reached (before an hour has elapsed). MOBILE6 assumes that hot soak
durations range from 1 minute at minium to a maximum of 60 minutes.
The hot soak time distributions reflect the number of vehicles experiencing a hot
soak of a given duration (1 to 60 minutes) at each hour of the day. MOBILE6
divides the day into 14 time periods: one for each hour between 6 a.m. and 7 p.m.,
plus one for the hours from 7 p.m. through 5 a.m. the next day. MOBILE6
computes hot soak emissions for each minute of each hour, and weights these
emissions by the fraction of vehicles experiencing a hot soak at that time. If this
command is used, 840 values must be entered representing the fraction of vehicles
experiencing a hot soak of each duration (1 to 60 minutes) at each time period of
the day (14).
This command requires an external data file. Format for the command is as
follows:
The HOT SOAK ACTIVITY command name is followed by the name of the
external file containing the user-supplied hot soak activity values. Each value is a
fraction between 0 and 1, and the values must add up to one for each time period.
The values must be arranged in columns of 60 fractions, with one column for each
time period starting with 6 a.m. The rows represent the time periods from 1 to 60
minutes.
Example: HOT SOAK ACTIVITY : HSACT.D
This example directs MOBILE6 to look for alternate hot soak activity data in an
external file called "HSACT.D". Within the file, the first line would be the
command name. The second line would be 14 values representing the fraction of
vehicles experiencing a 1-minute hot soak at each time period of the day. The
second line would contain values for a 2-minute hot soak, and so on. Examples of
properly formatted input can be found in the files:
HSACTDAY.D:
HSACTEND.D:
Default MOBILE6 weekday rates.
Default MOBILE6 weekend rates.
2.8.8.7 Diurnal Soak Activity
Name: DIURN SOAK ACTIVITY
Status: Optional.
Section: Scenario.
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November 4, 2002
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Description: This command allows users to specify a diurnal soak time distribution for each of
18 daily time periods.
Default: Please see technical report, M6.FLT.006.
Explanation: Diurnal emissions vary with the length of time a vehicle has been soaking (the
length of time it has been parked). The diurnal ends with the start of a new trip.
MOBILE6 assumes that diurnal soak times range from one hour at a minimum to
a maximum of 72 hours.
Diurnal soak time distributions represent the distribution of the length of time that
vehicles have been soaking during each of the 24 hours for which emissions are to
be calculated. However, the seven hours from 11 PM through 6 AM are treated as
having a common soak time distribution, reducing the number of required
distributions that represent the day from 24 to 18. Since temperatures fall during
the night, diurnal emissions will be calculated to be zero from 12 AM to 6 AM,
regardless of the soak time distribution
For each hour of the day, MOBILE6 computes emissions separately for the 72
different soak distributions and weighs them by the fraction of vehicles
experiencing a diurnal of that duration. If the user chooses this command, 1,296
values must be entered representing the fraction of vehicles experiencing a diurnal
of each duration (72) at each time period of the day (18).
This command requires an external data file. Format for the command is as
follows:
The DIURN SOAK ACTIVITY command name is followed by the name of an
external data file containing the alternate diurnal activity values. The values must
be arranged in columns, with one column for each time period starting with 6 a.m.
Each column contains 72 rows. The values must fall between 0 and 1. Note that
the sum of each hourly column does not need to add up to 1. The rows represent
the 72 MOBILE6 diurnal soak durations.
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November 4, 2002
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Example: DIURN SOAK ACTIVITY
: DSACT.D
This example directs MOBILE6 to look for user-supplied diurnal distribution data
in an external file called, "DSACT.D." Within the file, the first line is the
command name. The second line contains 18 values representing the fraction of
vehicles experiencing the first diurnal soak duration at each time period of the
day. The second line contains values for the second soak duration, and so on.
Examples of properly formatted input can be found in the following file:
DSACT.D: MOBILE6 defaults
2.8.8.8 Weekday Trip Length Distribution
Name: WE DA TRILEN DI
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to specify the fraction of weekday VMT that occurs
during trips of various durations at each hour of the day.
Default: Please see the example file below. These values are based on national data.
Explanation: The duration of a vehicle trip affects running loss evaporative emissions, which
depend on the amount of time the vehicle has been running. This command is
used to change the default values for the distributions of VMT by trip duration (in
time) for weekdays. MOBILE6 uses these distributions to calculate running loss
emissions. There is a separate distribution of VMT by trip duration for each hour
of the day.
If the user chooses to use this command, percentages must be entered for six trip
length ranges and 14 hourly groups, resulting in a total of 84 values. The trip
length ranges are 10 minutes or less; 11 to 20 minutes; 21 to 30 minutes; 31 to 40
minutes; 41 to 50 minutes; 51 or more minutes. The percent of VMT in each of
these six trip length ranges is required for each hour of the day from 6 a.m. to 7
p.m., plus an average distribution for the 11-hour block from 7 p.m. to 6 a.m.
This command requires fixed column format data entry. Data must be entered in a
precise order and location in the external data file. The required format is as
follows:
The first line consists of the command name.
-123-
November 4, 2002
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> The second line consists of the percent of VMT for the first hour (6 a.m. to
7 a.m.) for each of the six trip length ranges in order of increasing trip
length. The six individual percentages vary from 0.00 through 100.0,
inclusive, with their sum totaling 100.0.
» The next twelve lines provide the corresponding information for hours #2
(7 a.m. to 8 a.m.) through #13 (6 p.m. to 7 p.m.).
> The next (last) line provides the corresponding information for the 11-hour
block of time from 7 p.m. to 6 a.m.
Each data line contains six blocks of numbers, in which the first character of each
block is left blank and the remaining five characters are read as the value for that
block. In Fortran code, this is represented as 6(1X,F5.2). Each value must contain
a decimal, and each row must add up to 100.
Example: WE DA TRI LEN DI : WEDATRIP.D
Where data is supplied in an external file, "WEDATRIP.D", formatted as follows:
WE DA TRI LEN DI
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
This sample shows the default values used by MOBILE6 for the distributions of
trip lengths for weekdays.
Tip: This command uses a highly specialized definition of "trip." For more
information, please refer to the MOBILE6 document, "Trip Length Activity
Factors for Running Loss and Exhaust Running Emissions" (document number
-124- November 4, 2002
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2.8.8.9
Name:
M6.FLT.005). If the user plans to change the VMT by trip length, this specialized
definition of trip length must be used to determine the VMT distributions.
Weekend Trip Length Distribution
WE EN TRILEN DI
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to specify the fraction of weekend VMT that occurs
during trips of various durations at each hour of the day.
Default: Please see the example file below. These values are based on national data.
Explanation: The duration of a vehicle trip affects running loss evaporative emissions, which
depend on how long the vehicle has been running. This command is used to
change the default values for the distributions of VMT by trip duration for
weekends. MOBILE6 uses these distributions to calculate running loss emissions.
There is a separate distribution of VMT by trip duration for each hour of the day.
If the user elects to use this command, percentages must be entered for six trip
length ranges and 14 hourly groups, resulting in a total of 84 values. The trip
length ranges are 10 minutes or less; 11-20 minutes; 21-30 minutes; 31-40
minutes; 41-50 minutes; and 51 or more minutes. The percent of VMT in each of
these six ranges is required for each hour of the day from 6 a.m. to 7 p.m., plus an
average distribution for the 11-hour block from 7 p.m. to 6 a.m.
This command requires fixed column format data entry. Data must be entered in a
precise order and location in the external data file. The required format is as
follows:
> The first line consists of the command name.
» The second line consists of the percent of VMT for the first hour (6 a.m. to
7 a.m.) for each of the six trip length groups in order of increasing trip
length. The six individual percentages vary from 0.00 through 100.0,
inclusive, with their sum totaling 100.0.
» The next 12 lines provide the corresponding information for hours #2 (7
a.m. to 8 a.m.) through #13 (6 p.m. to 7 p.m.).
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November 4, 2002
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» The next (last) line provides the corresponding information for the 11-hour
block of time from 7 p.m. through 6 a.m.
Each data line contains six blocks of numbers, in which the first character of each
block is left blank and the remaining five characters are read as the value for that
block. In Fortran code, this is represented as 6(1X,F5.2). Each value must contain
a decimal, and each row must add up to 100.
Example: WE EN TRI LEN DI : WEENTRIP.D
Where data is supplied in an external file, "WEENTRIP.D", formatted as follows:
WE EN TRI LEN DI
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
06.74 18.51 16.78 13.11 08.33 36.53
This sample shows the default values used by MOBILE6 for the distributions of
trip lengths for weekend days.
Tip: The MOBILE6 default case uses only weekday activity data. If the user wishes to
use the weekend activity values, the "use weekend vehicle activity" (WE VEH
US) command must be executed.
The WE EN TRI LEN DI command uses a highly specialized definition of "trip."
For more information, please refer to the MOBILE6 document, "Trip Length
Activity Factors for Running Loss and Exhaust Running Emissions" (document
number M6.FLT.005). If the user plans to change the VMT by trip length, this
specialized definition of trip length must be used to determine the VMT
distributions.
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2.8.8.10 Use Weekend Vehicle Activity
Name: WE VEH US
Status: Optional.
Section: Scenario.
Description: This command directs MOBILE6 to apply weekend activity information in
calculating emissions that depend on vehicle usage rates.
Default: MOBILE6 applies weekday activity information to calculations.
Explanation: MOBILE6 activity values for vehicle usage affect engine start emissions (affected
by starts per day distributions), hot soak evaporative emissions (affected by hot
soak duration distributions), and running loss evaporative emissions (affected by
trip length distributions). This command directs MOBILE6 to use weekend-
specific activity values.
The only requirement for this command is the command name. There is no data
input required.
Example: WE VEH US :
2.8.9 State Programs
State program commands allow users to model the impact of state-specific emission
control programs such as inspection and maintenance (I/M).
2.8.9.1 Effects of Fuel Program on Emissions
Name: FUEL PROGRAM
NOTE: This command is cross-listed below under commands covering fuels. Please see
Section 2.8.10.1 for detailed information
2.8.9.2 Effects of Stage II on Refueling Emissions
Name: STAGE H REFUELING
Status: Optional.
Section: Run.
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Description: This command allows users to model the impact of a Stage II ("at-the-pump")
vapor recovery system requirement on refueling emissions (also referred to as
Stage II emissions) from gasoline-fueled vehicles.
Default: If the user does not use this command, then MOBILE6 does not calculate impact
of a Stage n program.
Explanation: Stage II systems reduce HC and associated air toxics emissions by reducing the
amount of gasoline vapor that escapes to the atmosphere during refueling and fuel
spillage. The amount of reduction depends on whether the vehicle has an onboard
recovery system and the level of uncontrolled emissions. The uncontrolled
emissions are calculated in MOBILE6 from inputs such as fuel RVP, fuel
economy, and various fuel temperature parameters.
This command requires fixed column format data entry. The Fortran format is
I2,1X,I1,2(1X,F3.0). The first line must contain the command name STAGE II
REFUELING. The second line contains the following four items:
* The first number supplies the last two digits of the calendar year in which
the Stage II program began or will begin. The eligible calendar years are
1989 through 2050, inclusive. Therefore, this variable may be any
two-digit integer except 51 through 88.
» The second number is a one-digit integer for the number of phase-in years
of the program. This value can range from 1 through 9. This value, in
combination with the calendar year in which the Stage II program began,
will determine the fraction of vehicle refueling affected by Stage n
controls. The fraction is determined linearly, beginning at zero at the
starting date and with full effect at the final year of the phase-in period.
» The third number is a three-digit number for the percent efficiency for the
LDGVs and LDGTs in the program. This value can range from 0 through
100.
» The fourth number is a three-digit number for the percent efficiency for the
HDGVs in the program. This value can range from 0 through 100.
Example: STAGE II REFUELING :
89 4 80. 60.
This example would model a Stage n program that started in 1989, was phased in
over four years, and was 80 percent efficient for LDGVs and LDGTs and 60
percent efficient for HDGVs.
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November 4, 2002
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Tips:
2.8.9.3
Name:
Status:
Section:
Description:
Default:
Explanation:
MOBILE6 applies a 95 percent reduction in refueling emissions from
uncontrolled levels from Onboard Refueling Vapor Recovery (ORVR) equipped
vehicles. The effects of ORVR technology is phased in over several model years.
For passenger cars, 40, 80, and 100 percent of 1998, 1999, and 2000 and newer
model year cars respectively will have ORVR. For light duty trucks up to 6000
pounds gross vehicle weight, 40, 80, and 100 percent of 2001, 2002, and 2003 and
newer model year trucks will have ORVR. For light duty trucks between 6001 and
8500 pounds gross vehicle weight, 40, 80, and 100 percent of 2004, 2005, and
2006 and newer model year trucks will have ORVR. Stage II programs will have
no additional emission reduction effect on these vehicles.
Anti-Tampering Programs
ANTI-TAMP PROG
Optional.
Run.
This command allows users to model the impact of an anti-tampering program
(ATP) and should be used only if the area being modeled has or expects to have
such a program.
MOBILE6 assumes there is no anti-tampering program present.
Some parts of the United States have implemented ATPs to reduce the frequency
and emissions impact of emission control system tampering, such as misfueling,
removal, or disablement of catalytic converters. This command allows users to
include the effects of such a program on calculated emission factors.
Selecting this command requires basic information about the anti-tampering
program to be modeled. The required information includes the calendar year that
the program began (start year), the earliest model year that is covered by the
program, the latest model year covered by the program, on/off toggle values that
determine if a particular vehicle class is included in the program, the frequency of
inspection, the compliance rate for the anti-tampering program, and on/off toggle
values that determine which vehicle components will be inspected.
This command requires fixed column format data entry. Any columns not
mentioned must be left blank. The Fortran type format that must be observed is:
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In the first line, the command name must start in column one. The second line
contains the program parameters:
> The first number is the last two digits of the calendar year in which the
anti-tampering program began or will begin. The calendar year input can
range from 1960 to 2050.
» The second number is the earliest model year to be covered by the
program. This input is the last two digits of the model year. The model
year range can be from 1960 to 2050.
» The third number is the last two digits of the final model year covered by
the program. The model year range can be from 1960 to 2050.
Following these first three numbers, there are 14 individual vehicle ATP coverage
toggle fields that contain either a value of 1 or 2. A value of 1 indicates that the
particular vehicle type is NOT subject to an ATP inspection, and a 2 indicates that
the particular vehicle type is subject to the inspection.
» The first five ATP coverage toggle fields correspond to the light-duty
gasoline vehicle classes. These five values for ATP vehicle coverage must
be given in the following order:
LDGV, LDGT1, LDGT2, LDGT3, LDGT4.
> The next eight vehicle ATP coverage toggle fields correspond to the eight
heavy-duty gasoline vehicle classes. The order of these values is:
HDGV2B, HDGV3, HDGV4, HDGV5, HDGV6, HDGV7, HDGV8A,
HDGV8B
» The final vehicle ATP coverage toggle field corresponds to gasoline buses.
GAS BUS
» The next entry must be the number ' 1'.
> The next data parameter is the ATP inspection frequency. A value must be
either ' 1' (annual frequency) or '2' (biennial - every other year frequency).
* The next data parameter is the program compliance rate. This value must
be from 0 percent to 100 percent, inclusive.
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» The last eight data parameters are the toggles indicating which inspections
the ATP will conduct. The value must be either 1 (no) or 2 (yes). The
values correspond to component inspections in the following order.
* Air pump system disablement.
> Catalyst removal.
* Fuel inlet restrictor disablement (requiring catalyst replacement).
» Tailpipe lead deposit test (requiring catalyst replacement).
* EGR disablement.
> Evaporative system disablement.
» PCV system disablement.
» Missing gas cap.
Example: ANTI-TAMP PROG :
83 75 50 22222 22222222 2 11 096. 22222222
This example models an ATP that starts in 1983, covers 1975 through 2050 model
years, inspects all 14 gasoline vehicle types, has an annual frequency, a
compliance rate of 96.0 percent and does all of the anti-tampering inspection
types.
Tips: The mere presence of an I/M program is expected to act as a deterrent to
tampering. Therefore, if the "EVI PROGRAM" command is present, MOBILE6
will reduce the tampering rates even if there is no anti-tampering program.
All 1996 and newer model year vehicles are assumed to have negligible tampering
effects. As a result, there is no tampering reduction benefit associated with the
1996 and newer vehicles.
2.8.9.4 Inspection/Maintenance (I/M) Programs
Many areas of the country have implemented inspection and maintenance (I/M) programs
to further reduce mobile source air pollution. (Note: MOBILE6 does not model the impact of
I/M on particulate emissions. The impact on air toxics is modeled through a change in base
hydrocarbon emissions.) MOBILE6 has the capability of modeling the impact of up to seven
different exhaust and evaporative emission I/M programs on calculated emission factors. By
defining multiple I/M programs, the user can model different requirements on different types and
ages of vehicles or different requirements in different calendar years.
MOBILE6 also allows users to enter a number of I/M program parameters to better model
specific I/M program features. These parameters include:
> Ability to model annual or biennial I/M programs.
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« Ability to model Idle, 2500/Idle, ASM, IM240, and onboard diagnostic (OBD) exhaust
I/M programs.
* Ability to model gas cap (GC), fill-pipe pressure test (FP), and OBD check evaporative
I/M programs.
* Ability to control model year coverage.
> Ability to control vehicle class coverage (only gasoline-fueled vehicles can be modeled
for I/M).
> Ability to vary the failure rate of the exhaust I/M program for pre-1981 model year
vehicles.
> Ability to vary the compliance rate of the I/M program.
» Ability to vary the waiver rate of the I/M program.
» Ability to vary the cutpoints used in an EVI240 program.
* Ability to account for the effect of exempting old vehicles from program requirements.
> Ability to account for the effect of exempting new vehicles from program requirements
(referred to here as a "grace period").
» Ability to eliminate the effects of technician training on exhaust I/M performance.
* Ability to assemble all of the I/M program parameters into a single external input file.
MOBILE6 provides 12 separate commands that allow users to specify I/M features. The
commands are listed and described below. The list begins with the required I/M commands
(these are required if the user wants to model any I/M program) and finishes with the less
frequently used I/M commands.
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List of I/M Commands
I/M PROGRAM
I/M MODEL YEARS
I/M VEHICLES
I/M STRINGENCY
I/M COMPLIANCE
I/M WAIVER RATES
I/M CUTPOINTS
I/M EXEMPTION AGE
I/M GRACE PERIOD
NO I/M TTC CREDITS
I/M EFFECTIVENESS
I/M DESC FILE
Required to model exhaust and evaporative I/M programs.
Required for exhaust and evaporative I/M programs.
Required for exhaust and evaporative I/M programs.
Required for exhaust I/M programs. Do not use with evaporative
I/M programs.
Required for exhaust I/M programs. Highly recommended for
evaporative I/M programs.
Required for exhaust I/M programs. Highly recommended for
evaporative I/M programs.
Required for EVI240 programs. Do not use with other exhaust or
evaporative I/M programs.
Optional for exhaust I/M programs. Highly recommended for
evaporative I/M programs.
Optional for exhaust I/M programs. Highly recommended for
evaporative I/M programs.
Optional for exhaust I/M programs. Do not use with evaporative
I/M programs.
Optional for exhaust I/M programs. Do not use with evaporative
I/M programs.
Optional for both exhaust and evaporative I/M programs.
NOTE: For an exhaust I/M program, all program parameters are derived from that
program's user-input parameters or from MOBILE6 default parameters. The program is not
affected by user-input parameters for other I/M programs (exhaust or evaporative).
However, an evaporative I/M program that runs simultaneously and on the same model
years as an exhaust program may be affected by the exhaust program. An evaporative program
will use its own user-input parameters, but if those are not provided, the evaporative program
will use the simultaneous exhaust program's user-input parameters; if those are not provided, the
evaporative program will use MOBILE6 default parameters. To make sure that the parameters
governing an evaporative I/M program do not change when other I/M program commands are
modified, always specify the evaporative I/M parameters explicitly.
2.8.9.4.a
Name:
I/M PROGRAM
Status: Optional (required if the user is modeling exhaust or evaporative I/M).
Section: Run.
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Description: This command directs MOBILE6 to model an I/M program and defines some
basic information about the program to be modeled.
Default: MOBILE6 assumes no I/M program is in place.
Explanation: If the user wishes to model an I/M program, this command must be executed. This
is where the user defines basic information such as the type of I/M program in
place, the calendar year that the I/M program began (start year), the final calendar
year that the I/M program is to run, and the program inspection frequency.
The format required for this command is free column format.
» The command name, I/M PROGRAM, must appear first.
* The first data parameter is the I/M program number. This equals "1" to
identify the first program the user is modeling, "2" to identify the second,
and so on. The valid range of numbers for this input is from 1 to 7, and
any series of values must be sequential (i.e., there must be a program 1
before there is a program 2).
* The second and third data parameters in the I/M PROGRAM command
are the I/M program start year and the I/M program end year. Both of these
parameters can range from calendar year 1960 through calendar year 2051.
All four digits are required, and the I/M program start year must precede or
be the same as the I/M program end year. Note: The start year represents
the year in which a particular group of vehicle types and model years were
first tested within an evaporative or exhaust I/M program. If a program
changes over time for a particular model year & vehicle type, the
subsequent program changes should be modeled in separate model runs
with separate I/M program descriptions that cover the relevant evaluation
years, such that each program for a vehicle type/model year group is listed
with the original I/M start year. This assures that MOBILE6 will model
the uninterrupted testing of these vehicles, rather than modeling each
program change as a completely new program.
> The fourth data parameter in the I/M PROGRAM command is the I/M
frequency parameter. A value of 1 is entered if the user desires an annual
program; a value of 2 is entered if the user desires a biennial program
(vehicles are inspected every other year).
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» The fifth data parameter in the I/M PROGRAM command is the I/M
program type. An entry is required, but has no effect on the exhaust I/M
program benefits unless the I/M EFFECTIVENESS command (2.8.9.4.k)
is used. This entry is required for evaporative I/M programs as well, but
has no effect on evaporative emissions, even with the use of the I/M
EFFECTIVENESS command. The possible entries are:
TRC for a "Test and Repair (computerized)" program,
TRM for a "Test and Repair (manual)" program,
T/O for a "Test Only" program.
The I/M program type must be TRC or TRM if the I/M EFFECTIVENESS
command is to be used.
» The sixth and final data parameter in the I/M PROGRAM command is the
I/M inspection test type. This is an alphanumeric input with the following
choices for an exhaust I/M program.
IDLE
2500/IDLE
LOADED/IDLE
IM240
ASM 2525 PHASE-IN
ASM 2525 FINAL
ASM 5015 PHASE-IN
ASM 5015 FINAL
ASM 2525/5015 PHASE-IN
ASM 2525/5015 FINAL
OBDI/M
And the following choices are for an evaporative I/M program:
EVAP OBD
EVAP OBD & GC
FP&GC
GC
Example: I/M PROGRAM : 1 1981 2050 2 T/O IM240
This example means that I/M program number 1 begins in calendar year 1981 and
ends in calendar year 2050. It is a biennial EVI240 program. The T/O stands for
"test only" and is a required input, but it has no effect on the results.
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Tip:
2.8.9.4.b
Name:
To model both the exhaust and evaporative benefits of an I/M program, the user
must enter (at least) two separate I/M programs. For example, to model the
exhaust and evaporative benefits of an OBD check program, the user must set up
two simultaneous I/M programs. One for "EVAP OBD" (for evaporative benefits)
and one for "OBD I/M" (for exhaust benefits).
I/M MODEL YEARS
Status: Optional (required if the user is modeling exhaust or evaporative I/M).
Section: Run.
Description: This command allows the user to provide the first and last model years that will
be covered by the I/M program to be modeled.
Default: There is no default for this command. This command is required if the user wishes
to model an I/M program. If the I/M PROGRAM command is present and this
command is not, MOBILE6 will issue an error message and the run will be
aborted.
Explanation: The format requirement for this command is free column format.
The command name, I/M PROGRAM, must appear first.
* The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command. The valid range of numbers for
this input is from 1 to 7, and any series of values must be sequential (i.e.,
there must be a program 1 before there is a program 2).
» The second and third data parameters are the first model year that is
covered by an I/M program and the last model year that is covered by an
I/M program. Both of these parameters can range from model year 1941
through model year 2050. All four digits are required, and the first model
year of coverage value must precede or be the same as the last model year
of coverage.
Example: I/M MODEL YEARS
1 1996 2050
This example means that I/M program number 1 tests model years 1996 through
2050.
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Tips:
2.8.9.4.C
Name:
Status:
Section:
The user cannot enter an OBD exhaust or evaporative I/M program that begins
before the 1996 model year for any vehicle type. If this is done, the program will
stop and generate an error message.
The user cannot enter an EVAP OBD I/M program for HD vehicles that begins
before the 2007 model year. If this is done, the program will stop and generate an
error message.
Fill-pipe pressure tests on OBD-equipped vehicles are not recommended. Credit
for such tests is not calculated by MOBILE6.
I/M VEHICLES
Optional (required if the user is modeling exhaust or evaporative I/M).
Run.
Description: This command identifies which vehicle types are subject to the specified I/M
program.
Default: There is no default for this command. This command is required if the user wishes
to model an I/M program. If the I/M PROGRAM command is present and this
command is not, MOBILE6 will issue an error message and the run will be
aborted.
Explanation: This command allows users to specify which of the 14 individual vehicle types
potentially subject to I/M are covered by a given I/M program.
The format required for this command is fixed column format. Columns not
discussed below must be left blank.
> The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command. The number is entered in
column 22.
> Following the I/M program number field, there are 14 individual vehicle
I/M program coverage toggle fields that contain either a value of 1 or 2. A
value of 1 indicates that the particular vehicle type is not subject to an I/M
inspection, and a 2 indicates that the particular vehicle type is subject to
the inspection.
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Tip:
2.8.9.4.d
Name:
Status:
Section:
The first five vehicle I/M program coverage fields correspond to the light-duty
gasoline vehicle classes beginning in column 24.
LDGV, LDGT1, LDGT2, LDGT3, LDGT4.
The next eight vehicle I/M program coverage fields correspond to the eight heavy-
duty gasoline vehicle classes beginning in column 30.
HDGV2B, HDGV3, HDGV4, HDGV5, HDGV6, HDGV7, HDGV8A,
HDGV8B.
The final vehicle I/M program coverage field corresponds to the gasoline buses in
column 39.
GAS BUS
Note that there is a blank space between the first five fields and the next eight
fields and between the eight fields and the final gas bus field. An error will result
if this exact format is not followed.
Example: I/M VEHICLES
1 22222 11111111 1
This example instructs MOBILE6 to calculate I/M benefits for light-duty gasoline
vehicles (cars and light-duty trucks) for I/M program number 1.
The user may choose any combination of vehicle types. However, the user must
enter a value of 2 for at least one of the vehicle types to get meaningful I/M
output.
The user cannot enter an EVAP OBD I/M program for HD vehicles that begins
before the 2007 model year. If this is done, the program will stop and generate an
error message.
I/M STRINGENCY
Optional (required if the user is modeling exhaust I/M; do not enter for
evaporative I/M).
Run.
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Description: This command defines the expected exhaust inspection failure rate for pre-1981
model year vehicles covered by the I/M program.
Default: There is no default for this command. This command is required if the user wishes
to model an exhaust I/M program. If the I/M PROGRAM command describes an
exhaust program and this command is not present, MOBILE6 will issue an error
message and the run will be aborted.
Explanation: The format required for this command is free column format.
* The command name, I/M STRINGENCY, must appear first.
* The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command.
» The second data parameter is the level of I/M stringency. The I/M
stringency rate is the test failure rate expected in pre-1981 model year
passenger cars or light trucks expressed as a percentage of tests
administered. The value the user enters has no effect on model years
greater than 1980.
The valid stringency range is from 10 percent stringency to 50 percent stringency.
Entry of a value outside of this range will generate an error message. The value is
entered into the program as a percentage including a decimal.
Example: I/M STRINGENCY
Tips:
1 50.0
This example instructs the computer for I/M program number 1 to set the
stringency at 50.0 percent.
This command is required even in exhaust cases to which it does not directly
apply, such as I/M programs in which pre-1981 model year vehicles are not tested,
or even in calendar years such as 2050 in which pre-1981 vehicles do not exist.
The command is not needed for evaporative I/M programs. If it is provided with
an evaporative I/M program number, the inputs will be ignored.
If the program stringency is greater than 50 percent, enter 50 percent. If the
stringency is less than 10 percent, use 10 percent as the value.
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2.8.9.4.e
Name:
Status:
Section:
Description:
Default:
I/M COMPLIANCE
Optional (required if the user is modeling exhaust I/M programs; highly
recommended for evaporative I/M).
Run.
This command describes the expected compliance with a given I/M program. The
compliance rate is the percentage of vehicles in the fleet that complete the I/M
program and receive either a certificate of compliance or a waiver.
There is no default for this command for exhaust I/M programs. It is required to
model an exhaust I/M program. If the I/M PROGRAM command describes an
exhaust program and this command is not present, MOBILE6 will issue an error
message and the run will be aborted.
If the I/M PROGRAM command describes an evaporative program, but a
compliance rate is not specified for the evaporative program and an exhaust
program is not in effect for a specific vehicle class and model year, MOBILE6
will use a default value of 85 percent for the evaporative program. However, if a
compliance rate is not provided for an evaporative program, but one is provided
for a simultaneous exhaust program, MOBILE6 will use the exhaust program
compliance rate to compute evaporative benefits on the vehicles and model years
covered by both the exhaust and evaporative programs.
Explanation: The format requirement for this command is free column format.
» The command name, I/M COMPLIANCE, must appear first.
> The first data parameter is the I/M program number used for the corresponding
I/M PROGRAM command.
* The second data parameter is the level of I/M compliance the user wishes to use.
The entered value indicates the percentage of the fleet subject to I/M that actually
goes through the entire I/M process to receive a "pass" or waiver. The I/M credit
is reduced in proportion to a reduction in the compliance rate. The valid
compliance rate range is from 50 percent compliance to 100 percent. The value is
entered into the program as a percentage that includes a decimal.
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Example: I/M COMPLIANCE
: 1 85.0
This example instructs the computer for I/M program number 1 to set the
compliance at 85.0 percent.
Enter the I/M COMPLIANCE command for all I/M programs. If this command is
not entered for an evaporative I/M program, the value may change when
commands for other I/M programs are added or modified.
I/M WAIVER RATES
Optional (required for modeling exhaust I/M programs; highly recommended for
evaporative I/M).
Run.
This command specifies the percentage of vehicles that fail an initial I/M test and
do not pass a retest but receive a certificate of compliance.
There is no default for this command for exhaust I/M programs. It is required if
the user wishes to model an exhaust I/M program. If the I/M PROGRAM
command describes an exhaust program and this command is not present,
MOBILE6 will issue an error message and the run will be aborted.
If the I/M PROGRAM command describes an evaporative program, but waiver
rates are not specified for the evaporative program and an exhaust program is not
in effect for a specific vehicle class and model year, MOBILE6 will use default
values of 5 percent for the evaporative program. However, if waiver rates are not
provided for an evaporative program but are provided for a simultaneous exhaust
program, MOBILE6 will use the exhaust program waiver rates to compute
evaporative benefits on the vehicles and model years covered by both the exhaust
and evaporative programs.
Explanation: The format required for this command is free column format.
* The command name, I/M WAIVER RATES, must appear first.
» The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command.
Tip:
2.8.9.4J
Name:
Status:
Section:
Description:
Default:
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The second data parameter is the waiver rate for the pre-1981 model year
vehicles
Tip:
2.8.9.4.g
Name:
« The third data parameter in the I/M WAIVER RATES command is the
waiver rate for 1981 and later model year vehicles.
The valid input range for waiver rate percentages are between 0 percent and 50
percent. The values are entered into the program as percentages that include a
decimal. If either of the waiver rates exceed 50.0 percent, the program will issue
an error message.
Example: I/M WAIVER RATES
1 5.0 3.0
This example instructs MOBILE6 to set the waiver rate at 5.0 percent for pre-
1981 model years and 3.0 percent for 1981 and later model years for I/M program
number 1.
I/M waiver rates must be expressed as a percentage of the vehicles that fail the
I/M program, not as a percentage of the entire fleet.
Enter the I/M WAIVER RATES command for all I/M programs. If this command
is not entered for an evaporative I/M program, the value may change when
commands for other I/M programs are added or modified.
I/M OUTPOINTS
Status: Required for EVI240 programs. Do not use with other exhaust or evaporative I/M
programs.
Section: Run.
Description: This command specifies the emission level "cutpoints," which determine whether
a vehicle passes or fails an I/M test. The I/M CUTPOINTS command is used only
if the user is modeling an EVI240 program.
Default: There is no default for this command. If the user wishes to model an I/M240
program, this command must be used to enter cutpoint values.
This command is not needed for evaporative I/M programs. If it is provided with
an evaporative I/M program number, the inputs will be ignored. This command
also should not be used with other (non EVI240) exhaust I/M programs.
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Explanation: The format required for this command is free column format.
* The command name, I/M CUTPOINTS, must appear first.
* The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command.
» The second data parameter is the name of an external file that contains the
cutpoint information. The complete path information must be provided if
the file is not in the same subdirectory as the MOBILE6 program.
> The format required for data within the external file is free column format.
The label, I/M CUTPOINTS, needs to appear at the top of the file and begin in
column one. Following the I/M CUTPOINTS label are the IM240 cutpoints.
These are entered in blocks of 75 cutpoints. The first block of cutpoints is for the
passenger car and light-duty gas truck 1 vehicle classes (LDGV and LDGT1). The
second block of cutpoints is for the light-duty gas truck 2 and 3 classes (LDGT2
and LDGT3). The third block of cutpoints is for the light-duty gas truck 4 class
(LDGT4). The fourth and final block is for the heavy-duty gas vehicle class
(HDGV).
Each of the four blocks mentioned above consist of three blocks of 25 values.
These three sub-blocks are the HC, CO, and NOX cutpoints, respectively. The
values in a group of 25 are associated with age, starting with the youngest vehicle.
All EVI240 cutpoint sets must have valid values for all HC and CO cutpoints.
Valid cutpoints are between 0.80 / 15.0 / 2.0 grams per mile and 5.0/100.0/4.5
grams per mile (for HC, CO, and NOx respectively). If the user enters EVI240
cutpoints that are more stringent (lower) than 0.80 / 15.0 / 2.0 grams per mile
levels, MOBILE6 will set the cutpoints to the minimum levels and issue a
warning. If the user enters EVI240 cutpoints that are less stringent (higher) than
5.0 /100.0 grams per mile (HC and CO respectively), MOBILE6 will set the
cutpoints to the maximum levels, but no warning will be issued. Entering a NOx
cutpoint value greater than 4.5 grams per mile indicates that no NOx cutpoint is
used in the program, and the NOx benefit calculated will be zero.
Example: I/M CUTPOINTS
: 1 C:\MOBILE\CUTPOINT.D
This command directs MOBILE6 to look for the appropriate I/M cutpoints in the
external file, "CUTPOINT.D". An example of proper format for the external file
can be found in the file, "CUTPOINT.D".
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Tips:
2.8.9.4.h
Although outpoints for heavy-duty vehicles are required for I/M 240 programs,
they have no effect on MOBILE6 emission results.
Name: I/M EXEMPTION AGE
Status: Optional for exhaust I/M programs. Highly recommended for evaporative I/M
programs.
Section: Run.
Description: This command allows users to specify the age at which vehicles become exempt
from the I/M program they wish to model. This is similar in effect to setting the
last model year covered by the I/M program using the I/M MODEL YEARS
command. However, it allows vehicles over a given age to be exempted when
evaluating multiple calendar years without requiring separate runs using different
values for the I/M MODEL YEARS command.
Default: 25 years old (in effect, under a default scenario, vehicles never become exempt
from I/M because of age).
If an exhaust I/M program is in effect and the user enters an exemption age for the
program, the exhaust program exemption age will apply to the same vehicles and
model years in any simultaneous evaporative I/M program, unless a different
exemption age is explicitly entered for the evaporative I/M program.
Explanation: The format requirement for this command is as follows:
> The command name, I/M EXEMPTION AGE, must appear first.
> The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command.
* The second data parameter is the I/M exemption age. This is the age at
which vehicles are no longer subject to mandatory I/M requirements. The
valid range for this input is 1 through 25. A value of 1 would exempt the
entire fleet from the I/M requirements (vehicles aged 0 years are never
subject to I/M), and a value of 25 would exempt vehicles aged 25 years
and older. Exempted vehicles lose all potential I/M credit. The exemption
age input value must be entered into MOBILE6 as an integer.
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Example: I/M EXEMPTION AGE : 1 21
Tip:
2.8.9.4.1
Name:
Status:
Section:
This example instructs MOBILE6 to set the I/M exemption age to 21 years old for
I/M program number 1.
Including or exempting vehicles older than 25 years has no effect on I/M program
benefits because MOBILE6 does not calculate emissions for vehicles older than
25 years.
Enter the I/M EXEMPTION AGE command for all evaporative I/M programs. If
this command is not entered for an evaporative I/M program, the value used in the
model may change when commands for other I/M programs are added or
modified.
I/M GRACE PERIOD
Optional for exhaust I/M programs. Highly recommended for evaporative I/M
programs.
Run.
Description: This command allows users to specify the age at which vehicles first become
subject to I/M testing (newer vehicles are exempt).
Default: 1 year old.
If an exhaust I/M program is in effect and the user enters a grace period for the
exhaust program, the exhaust program grace period will apply to the same
vehicles and model years in any simultaneous evaporative I/M program, unless a
different exemption age is explicitly entered for the evaporative I/M program.
Explanation: The format required for this command is as follows:
The command name, I/M GRACE PERIOD, must appear first.
» The first data parameter is the I/M program number used for the
corresponding I/M PROGRAM command.
» The second data parameter is the I/M grace period. This is the age at which
vehicles are first subject to mandatory I/M requirements. This input allows
users to model programs that exempt the newest vehicles from the
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requirements. The valid range for this input is 1 through 25. A value of 1
would exempt only those vehicles that are less than 1 year old (the
default), and a value of 25 would exempt all but the oldest model year
vehicle. Exempted vehicles lose all I/M credit. The exemption age input
value must be entered into MOBILE6 as an integer.
Example: I/M GRACE PERIOD
Tip:
2.8.9.4J
Name:
This example instructs MOBILE6 to set the I/M grace period to 5 years old for
I/M program number 1.
Enter the I/M GRACE PERIOD command for all evaporative I/M programs. If
this command is not entered for an evaporative I/M program, the value used in the
model may change when commands for other I/M programs are added or
modified.
NO I/M TTC CREDITS
Status: Optional for exhaust I/M. Not used for evaporative I/M programs.
Section: Run.
Description: This command eliminates the I/M credit that MOBILE6 assigns to a technician
training program.
Default: MOBILE6 assigns full I/M credit for technician training. This command is
appropriate only if the I/M program does not conduct or plan to conduct a
technician training program.
Explanation: This command requires only the command name and I/M program number to be
entered.
The command is not needed for evaporative I/M programs. If it is provided with
an evaporative I/M program number, the inputs will be ignored.
Example: NO I/M TTC CREDITS : 1
This example instructs the computer to remove the I/M technician training credits
from the I/M benefits for I/M program number 1.
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2.8.9.4.k
Name:
I/M EFFECTIVENESS
Status: Optional.
Section: Run.
Description: This command is a correction factor that reduces the exhaust I/M credit for test
and repair programs by the specified input percentage.
Default: 100 percent or full credit to all I/M program types.
Explanation: This command allows the user to enter separate effectiveness values for each of
the three pollutants. These values will apply to all exhaust I/M programs in that
run. Within a run, it is not possible to model separate effectiveness levels for each
I/M program element. The command does not affect evaporative I/M or ATP
calculations.
The format required for this command is free column format. The command
name, I/M EFFECTIVENESS, must appear first.
* The next three inputs are the I/M effectiveness values for HC, CO and NOX
pollutants, respectively. The effectiveness values are entered as fractions.
For example, if a value of 0.80 is entered for the first parameter, then the
HC I/M benefits are reduced by 0.20 or 20 percent (1.0 - 0.80 = 0.20). All
values are entered into the program as fractions from 0.0 to 1.0 and
include a decimal. Values outside the range of 0.0 to 1.0 will produce
error messages. Note that the I/M program number is not an input for this
command.
The I/M EFFECTIVENESS Command requires the I/M type parameter in the I/M
PROGRAM Command (2.8.9.4.a) to be set to either "TRC" or "TRM". If the
user sets the program type is to "T/O", then the I/M EFFECTIVENESS Command
has no effect (default value of 100% is used).
Example: I/M EFFECTIVENESS : 0.80 0.70 0.72
Tip: Unlike other I/M commands, the data section of this command does not begin
with the I/M program number. Instead, the first value in the data section is the
effectiveness value for HC. Thus, entering the command: I/M
EFFECTIVENESS : 1 0.5 0.5 0.5 will lead to the computation of 100%
effectiveness for HC and 50% effectiveness for CO and NOx, for all exhaust I/M
programs in the run.
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2.8.9.4.1
Name:
I/M DESC FILE
Status: Optional.
Section: Run.
Description: This command allows users to enter any set of I/M commands in an external file
rather than in the MOBILE6 command input file.
Default: There is no MOBILE6 default for this command.
Explanation: This command instructs MOBILE6 to read I/M records from an external data file.
When the model finds this command in the command input file, it opens the
external file named in the command and continues to read I/M program
description commands from that file. The external file can contain any of the I/M
commands except another I/M DESC FILE command. It may also contain any
number of blank and comment lines. Comment lines read from the external file
will be treated exactly as though they had been read from the command input file.
Comments beginning with a "greater than" symbol (>) will be appear in the output
file. Blank lines and comments beginning with an asterisk (*) will be ignored.
The format required for this command is the command name followed by the
name of the external file as the first data parameter. The file's complete path name
is required if the file is not in the same subdirectory as the MOBILE6 program.
Unlike most other external files, the one for this command does not repeat the
command name on the first line.
Example: I/M DESC FILE : IMTEST.D
This example instructs MOBILE6 to read I/M program descriptions from an external file called,
"IMTEST.D". A sample data set can be found in the file, "IMTEST.D".
Tips: This option lets the user avoid retyping a long set of repetitive I/M commands
each time the model is run. If the user decides to use this option, all of the I/M
inputs should be included for a given run, rather than dividing them between an
external file and the MOBILE6 command input file.
2.8.10 Fuel Commands
Fuel commands allow users to model the impact of various gasoline fuel parameters.
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2.8.10.1 Fuel Program
Name: FUEL PROGRAM
Status: Optional.
Section: Run or Scenario.
Description: This command allows users to specify one of two Tier 2 sulfur phase-in
schedules, to model the impact of a reformulated gasoline (RFG) program, or to
specify sulfur content for gasoline after 1999.
Default: MOBILE6 assumes that there is no RFG program in place and applies the
standard Tier 2 gasoline sulfur phase-in schedule for calendar years after 1999.
This default condition is described below as "Conventional Gasoline East."
Explanation: This command allows four options. Users may specify one of two Tier 2 sulfur
phase-in schedules, model the effect of an RFG program, or directly supply values
for gasoline sulfur content after 1999.
Users select the desired option by entering an integer following the command
name. This data entry is in free column format. Some options also require
additional input data, as described below. The options and their associated
numbers are:
1 Conventional Gasoline East
2 Reformulated Gasoline
3 Conventional Gasoline West
4 User-supplied gasoline sulfur levels.
Each of these options and its input requirements are described in detail below.
Conventional Gasoline EastThis is the MOBILE6 default. It supplies
post-1999 gasoline sulfur levels by year under the phase-in schedule
prescribed by the Tier 2 rule for most states.
See www.epa.gov/otaq/tr2home.htm#documents for more information on
the Tier 2 rule.
The user may select Conventional Gasoline East by omitting the FUEL
PROGRAM command (because this is the default option) or by placing
the integer, "1", on the command line after the FUEL PROGRAM
command.
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Conventional Gasoline WestThis option supplies post-1999 gasoline
sulfur levels by year under the phase-in schedule prescribed by the Tier 2
rule for specific western states (i.e., Alaska, Colorado, Idaho, Montana,
New Mexico, North Dakota, Utah, Wyoming) and bordering counties in
other states.
See www.epa.gov/otaq/tr2home.htm#documents for more information on
the Tier 2 rule, and see 66 FR 19306, April 13, 2001, for a list of the
relevant counties and Federal Indian reservations.
The user may select Conventional Gasoline West by placing the integer,
"3", on the command line after the FUEL PROGRAM command.
Reformulated Gasoline (RFG)This option should be used to model the
effects of an RFG program (Unless the user intends to model air toxics, in
which case the RFG parameters must be entered explicitly. See Section
2.8.3.7). The option sets 1995-and-later gasoline sulfur content, oxygen
content, and fuel volatility values for the MOBILE6 calculations, generally
overriding default fuel parameters and parameters set with the FUEL RVP,
SULFUR CONTENT, and OXYGENATED FUELS commands. Although
the exact composition of RFG fuel may vary by refiner, the RFG fuel
values modeled in MOBILE6 are consistent with the RFG requirements,
and represent the typical values expected in an RFG area.
Like conventional gasoline, RFG must meet fuel volatility requirements
that vary by geographic region (see "Volatility Regulations for Gasoline
and Alcohol Blends Sold in Calendar Years 1992 and Beyond," 55 FR
23658, June 11, 1990). Because the RFG option often sets fuel volatility
and overrides the FUEL RVP label, the RFG option requires the user to
indicate which region (north or south) is being modeled. The user may
select Reformulated Gasoline by placing the integer, "2", on the command
line after the FUEL PROGRAM command, followed by the appropriate
letter, "S" (for south), or "N" (for north). The value designating the fuel
volatility region must be separated from the program value, "2", by at least
one blank space.
The exact fuel parameters modeled for RFG depend on the geographic
region, the calendar year, and the season. The values used in MOBILE6
are listed in the following two tables. Explanatory notes follow the tables.
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Reformulated Gasoline Parameters Summer (1)
Year (2)
1995-1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
RVP (pounds per
square inch, or psi)
North
8.0
6.7
6.7
6.7
6.8
6.8
6.8
6.8
6.8
6.8
South
7.1
6.7
6.7
6.7
6.8
6.8
6.8
6.8
6.8
6.8
Oxygenated Fuels
Ether
Oxygen
Content
(% by
weight)
2.1
2.1
2.1
2.1
2.1
2.1
2.1
2.1
2.1
2.1
Ether
Market
Share (%)
100
100
100
100
100
100
100
100
100
100
Sulfur Content (ppm)
Average
300
150
149
129
120
120
90
30
30
30
Max
N/A
1000
1000
1000
1000
303
303
87
87
80
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Reformulated Gasoline Parameters Winter (1)
Year (2)
1995-
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
RVP
(psi)
North
or
South
as set
by user
Oxygenated Fuels (3)
Ether
Oxygen
Content
(% by
weight)
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Ether
Market
Share
(%)
70
70
70
70
70
70
70
70
70
70
Ethanol
Oxygen
Content
(% by
weight)
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.5
Ethanol
Market
Share
30
30
30
30
30
30
30
30
30
30
Sulfur Content
(ppm) (4)
Average
300 (5)
300
299
279
259
121
92
33
33
30
Max
N/A
1000
1000
1000
1000
303
303
87
87
80
Notes for Reformulated Gasoline Parameter tables:
(1) The Clean Air Act defines the RFG "Summer" as May 1 through
September 15. "Winter" is the rest of the year. MOBILE6 will generally
determine which fuel season to model using the value input for
EVALUATION MONTH (1 = January and indicates winter; 7 = July and
indicates summer). However, the user can override the fuel season
indicated by the EVALUATION MONTH by using the SEASON
command described later in this chapter.
(2) For most of the fuel parameters, the year listed here indicates the
calendar year for which the fuel parameter is typical. However, the
"Maximum Sulfur'Value represents the maximum sulfur level ever
experienced by a vehicle, regardless of the fuel level in the calendar year
of the MOBILE6 run. Thus, the "year" in these tables is used to assign the
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maximum sulfur values to the appropriate vehicle model year. The
maximum sulfur effect is not calculated for 1999-and-earlier vehicles, so
no maximum sulfur level is needed for these years.
(3) During the winter fuel season, the user may override the default RFG
parameters for oxygenated fuels if the user-supplied oxygenated fuel
parameters have a combined oxygenate for ethanol and ether blends
greater than 2.1 percent by weight and the combined oxygenate market
share is 100 percent.
(4) The winter RFG sulfur values listed here and used in MOBILE6 when
the RFG option is selected are appropriate for most of the United States,
but they are not correct for states with "western" Tier 2 fuel (see
"Conventional Gasoline West" above). The "Tips" section at the end of
this command entry explains how to model winter RFG for these western
states.
(5) In the winter RFG season, user input for SULFUR CONTENT will
override the default average fuel sulfur for calendar years 1999-and-
earlier. This is not true for summer RFG.
User-supplied Gasoline Sulfur LevelsThis option allows the user to directly
specify the average and maximum sulfur levels for calendar years 2000 and later if
these are known to differ from RFG or the conventional fuels programmed into
the model. For calendar years prior to 2000, the SULFUR CONTENT command
must be used.
The user may select user-supplied sulfur levels for 2000 and later by placing the
integer, "4", on the command line after the FUEL PROGRAM command. On the
following lines, the user must enter 32 values, indicating average and maximum
fuel sulfur contents (parts per million, or ppm) in the lines following the
command. The first 16 values are the average fuel sulfur content for gasoline in
calendar years 2000 through 2015. The next 16 values are the maximum sulfur
levels to which the model years 2000 through 2015 are exposed. These values
should represent the maximum sulfur in any batch of fuel sold in the modeled
area. The 2015 value is used for all 2015 and newer model years. Values from 30
ppm to 1,000 ppm are valid inputs for both the average and the maximum sulfur
levels, but MOBILE6 calculates identical sulfur effects for all values more than
600 ppm. All values are in ppm and must be entered with a decimal point. Each
value must be separated by at least one space.
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If particulate emissions are being estimated (See Section 2.8.3.2), increasing the
amount of sulfur in the vehicle fuel has the effect of directly increasing estimated
sulfate particulate emissions.
Examples: FUEL PROGRAM : 1
The preceding example calls for the Conventional Gasoline East fuel program.
FUEL PROGRAM : 3
The preceding example calls for the Conventional Gasoline West fuel program.
FUEL PROGRAM : 2 S
The preceding example calls for a RFG fuel program for a southern region .
FUEL PROGRAM : 2 N
The preceding example calls for a RFG fuel program for a northern region.
FUEL PROGRAM : 4
300.0 299.0 279.0 259.0 121.0 92.0 33.0 33.0
30.0 30.0 30.0 30.0 30.0 30.0 30.0 30.0
1000.0 1000.0 1000.0 1000.0 303.0 303.0 87.0 87.0
80.0 80.0 80.0 80.0 80.0 80.0 80.0 80.0
This final example demonstrates user-supplied gasoline sulfur levels. The values
provided here are the same sulfur levels used for the MOBILE6 default
(Conventional Gasoline East).
Tips: The FUEL PROGRAM command affects sulfur content prior to calendar year
2000 only when RFG is selected. In general, use the SULFUR CONTENT
command to define the sulfur content of gasoline in calendar years before 2000.
MOBILE6 treats FUEL PROGRAM command option 4 as a conventional
gasoline program with alternate sulfur levels. If an RFG program is desired with
alternate sulfur levels, the FUEL PROGRAM command option 4 lets users enter
the sulfur levels and alter the other non-sulfur fuel parameters through the FUEL
RVP and OXYGENATED FUELS and/or AIR TOXICS fuel commands to
approximate the non-sulfur effects of RFG.
It is not appropriate to use the FUEL PROGRAM command option 2 to choose a
Phase 2 (calendar year 2000 or later) RFG program for western Tier 2 sulfur
content phase in states (listed above). Users wishing to model western RFG will
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2.8.10.2
need to specify all of the fuel parameters (sulfur content, oxygen content and
RVP) separately for each calendar year they wish to evaluate. In winter season
scenarios, users should use the FUEL PROGRAM command to choose
"Conventional Gasoline West" to obtain the appropriate winter sulfur levels.
Then, using the OXYGENATED FUELS command, users must enter either the
winter RFG oxygenated fuel parameters described above or a local oxygenated
fuels program that satisfies the RFG rule. The FUEL RVP command is used to
specify fuel volatility. Modeling western RFG in summer will require the user to
specify the sulfur levels using the FUEL PROGRAM command option 4, because
the summer average sulfur will be the same as those shown above for RFG,
however, the maximum sulfur values will be those shown for the western phase in
states. As with winter, the user must specify the appropriate oxygen content and
fuel RVP levels shown above for RFG using the OXYGENATED FUELS and
FUEL RVP commands. To model air toxics emissions Western RFG, users
should make the appropriate adjustments to the air toxics fuel command.
Sulfur Content of Gasoline
Name: SULFUR CONTENT or GASOLINE SULFUR
(The two command names are equivalent.)
Status: Optional.
Section: Scenario.
Description: This command allows the user to enter the sulfur content of gasoline fuel for
calendar years through 1999. This input is valid only through the 1999 calendar
year. For calendar years after 1999, MOBILE6 will ignore this input.
Default: 300 ppm
Explanation: MOBILE6 will accept sulfur contents for 30.0 ppm through 600.0 ppm. If a sulfur
level outside that range is entered, MOBILE6 will round to the (appropriate) end
point (30 ppm or 600 ppm) and generate a warning message.
This command only requires one value in the data field of the command, namely
the sulfur content of the fuel in ppm.
Example: SULFUR CONTENT
50.0
Tips:
To enter values for years after 1999, the FUEL PROGRAM command must be
used.
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Using this command will override the default fuel sulfur content (300 ppm) used
for Reformulated Gasoline in calendar years 1995 through 1999 (Phase 1) in both
Regions (North and South) and in both winter and summer seasons.
The user should note that the GASOLINE SULFUR and DIESEL SULFUR
commands are not completely analogous. The GASOLINE SULFUR command
applies only the 1999 and earlier calendar years, while the DIESEL SULFUR
command applies to all calendar years.
2.8.10.3
Sulfur Content of Diesel Fuel
Name:
DIESEL SULFUR
Status:
Mandatory, if PARTICULATES command is used.
Section:
Scenario
Description: This command provides for the input of the average diesel fuel sulfur level for the
scenario.
Default:
None
Explanation: The value is specified in units of parts of sulfur per million. This value can range
from 0.01 ppm to 5000 ppm.
Example: DIESEL SULFUR : 15.00
Tip: The user should note that the GASOLINE SULFUR and DIESEL SULFUR
commands are not completely analogous. The GASOLINE SULFUR command
applies only the 1999 and earlier calendar years, while the DIESEL SULFUR
command applies to all calendar years.
The diesel fuel sulfur content value does not affect the calculation of HC, CO, and
NOX emissions or of air toxic compounds (except when calculated as a ratio to
PM).
If paniculate emissions are being estimated (See Section 2.8.3.2), increasing the
amount of sulfur in the vehicle fuel has the effect of directly increasing estimated
sulfate paniculate emissions.
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2.8.10.4 Oxygenated Fuels Programs
Name:
OXYGENATED FUELS
Status: Optional. (Note: Cannot be used with AIR TOXICS command. See
OXYGENATE command, Section 2.8.10.7.f and RVP OXY
WAIVER command, Section 2.8.10.7.g.)
Section:
Run or Scenario.
Description: This command permits users to model the effects of oxygenated gasoline on
exhaust emissions for all gasoline-fueled vehicle types.
Default: If the OXYGENATED FUELS command is not used and the FUELS PROGRAM
command is not used to select a RFG program, MOBILE6 assumes that the fuel
used by gasoline-fueled vehicles does not contain an oxygenate and does not
calculate an oxygenated fuels benefit.
Explanation: The effect of oxygenated fuels on emissions depends on several fuel parameters
that are specified by this command. These include whether the oxygenate is an
alcohol or ether blend; the amount of oxygen in the fuel; and the market share of
oxygenated fuels. In certain cases, the presence of oxygenate in fuel can affect fuel
RVP, generating an additional emission effect (see the "Tips" section on page
110).
The command requires five numbers be provided by the user in the data field
portion of the command record. Each of the five values must be separated from
the others by at least one blank space:
> The first number specifies the ether blend market share (expressed as a
decimal fraction). The range is 0.000 to 1.000.
» The second number specifies the alcohol blend market share (expressed as
a decimal fraction). The range is 0.000 to 1.000.
* The third number specifies the average oxygen content of ether blend fuels
(percent weight, expressed as a decimal fraction). The range is 0.000 to
0.027.
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» The fourth number specifies the average oxygen content of alcohol blend
fuels (percent weight, expressed as a decimal fraction). The range is 0.000
to 0.035.
» The fifth number specifies whether a Reid vapor pressure (RVP) waiver
has been granted to allow "splash" blending of alcohol-based oxygenates.
If a waiver has not been granted (value = 1), then alcohol-based
oxygenated fuels must meet the same RVP requirements as non-
oxygenated fuels sold in the area. If a waiver has been granted (value = 2),
then alcohol-based oxygenated fuels are allowed to exceed the RVP
requirements by up to 1 pound per square inch (psi), and the user-input
RVP is increased to account for the market share of the higher RVP fuel.
Note: If the market share of the oxygenated fuels is not 100%, then the
average RVP of fuel will be increased by a commingling effect from the
mixing of oxygenated and non-oxygenated fuels, even if there is no RVP
waiver for oxygenated fuels.
Example: OXYGENATED FUELS : .035 .129 .027 .031 2
This example states that 3.5 percent of the fuel sold in the area is an ether blend
with an average oxygen content of 2.7 percent weight; that 12.9 percent of the fuel
sold in the area is an alcohol blend with an average oxygen content of 3.1 percent
by weight; and that an RVP waiver is in effect allowing the volatility of the
alcohol-based oxygenated fuels to be up to 1.0 psi RVP greater than the limit
applicable to straight gasoline.
Tips: If the user specifies a RFG program using the FUEL PROGRAM command, then
the oxygenated fuel parameters of that program take precedence over the
OXYGENATED FUELS command. See Section 2.8.10.1, which describes the
FUEL PROGRAM command, for more information on the RFG program
parameters and their effects.
The OXYGENATED FUELS command may change the expected effects of the
mandatory user input for the SCENARIO RECORD command. For more details,
see the discussion of the RVP waiver for "splash-blended" fuels in the
"Explanation" section on page 109.
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2.8.10.5
Fuel Reid Vapor Pressure (RVP)
Name:
FUEL RVP
Status:
Required.
Section:
Run or Scenario.
Description: This command allows users to specify fuel RVP for the area to be modeled
Default: There is no MOBILE6 default for fuel RVP. Users must enter a value for all
scenarios (in the Run section) or for each scenario (in the Scenario section) of
each MOBILE6 command input file.
Explanation: RVP is one measure of the volatility of gasoline. Exhaust and especially non-
exhaust emissions vary with fuel volatility. The FUEL RVP command specifies
the value of RVP (in psi) representing the prevailing average fuel volatility for the
geographic area of interest.
The RVP value entered must reflect the average in-use RVP of gasoline in the
region of the country being modeled. The RVP value can be between 6.5 psi and
15.2 psi, inclusive. If the user enters a value outside this range, MOBILE6 will
round to the appropriate endpoint (6.5 psi or 15.2 psi) and will generate a warning
message.
However, there are federal limits on fuel RVP in ozone-producing months (May
through September), which began in 1989. For the calendar years 1989 to 1991,
the RVP limit is 10.5 psi, 9.5 psi, or 9.0 psi depending on the region of the
country or summer month (see Federal Register 54 FR 11868, March 22, 1989).
For calendar years 1992 and beyond, the summer RVP limit is either 9.0 psi or 7.8
psi depending on the region or month (see Federal Register 54 FR 23658, June 11,
1990).
The only required data are the command name FUEL RVP and the fuel RVP (in
psi), which can be placed anywhere in the data field of the command record.
Example: FUEL RVP
: 9.0
This example would model a region of the country where the prevailing fuel RVP
was 9.0 psi.
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Tips:
At temperatures below 45°F, fuel evaporation becomes negligible and RVP is
assumed to have no effect on emissions. However, it is still a required input.
The RVP effects are the same for all RVP values greater than 11.7 psi.
The OXYGENATED FUELS, OXYGENATE, and the FUEL PROGRAM
commands may affect the RVP used in the model calculations. See the sections on
these commands for more details.
2.8.10.6
Effective Season for RFG Calculation
Name:
SEASON
Status:
Optional.
Section:
Run or Scenario.
Description: This command identifies the effective season (winter or summer) for the RFG
calculation regardless of the month being modeled.
Default: MOBILE6 assumes the season is winter when January is selected as the
evaluation month and that the season is summer when July is selected as the
evaluation month. The MOBILE6 default evaluation month is January, so winter
RFG will be modeled unless the user selects July using the EVALUATION
MONTH command or selects summer by using this command.
Explanation: The effect of RFG on emissions differs in summer and winter. The SEASON
command allows the user to override the effect of the EVALUATION MONTH
command on RFG calculations, either specifying that summer RFG rules be
applied when the evaluation month is January or that winter RFG rules be applied
when the evaluation month is July. This command affects only RFG-related
emission results.
The SEASON command can assume only two values: a "1" (denoting summer) or
a "2" (denoting winter). This information must appear in the data portion of the
record following the command name.
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Example: SEASON
Tips:
This example directs MOBILE6 to use summer RFG values.
The SEASON command affects results only relating to RFG. The SEASON
command will have no effect on results unless the input includes a FUEL
PROGRAM command, indicating that an RFG program is in place.
2.8.10.7
Fuel Commands Used ONLY in the Air Toxic Emission Calculations
This series of commands are used only in the calculation of air toxic emissions in
MOBILE6.2. Most are required commands if the user desires air toxic emission results. Except
for the OXYGENATE command, they have no effect on the calculation of HC, CO, NOX, or PM
emissions.
2.8.10.7.a Volume Percent of Aromatic Compounds in Gasoline
Name:
GAS AROMATIC%
Status: Required, if the AIR TOXICS command is used. Do not use this command
without the AIR TOXICS command.
Section:
Scenario.
Description: This command allows users to specify the aromatic content of gasoline on a
volume of fuel percentage basis.
Default:
None.
Explanation: This is the percentage of aromatic compounds in gasoline on a volume basis. An
aromatic compound is one which contains a six-carbon ring configuration of the
benzene series and related organic groups. The value supplied by the user should
include benzene and other aromatic type compounds (i.e., toluene).
The valid range of inputs is from 10% to 55%. Any values outside of this range
will most likely lead to erroneous results. A typical value for this input is in the
range of 20 to 30 percent Aromatic compounds by volume. Wintertime values are
typically lower than summertime values.
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Example: GAS AROMATIC% :25
This example specifies gasoline with 25% aromatics by volume.
2.8.10.7.b Volume Percent of Olefm Compounds in Gasoline
Name: GAS OLEFIN%
Status: Required, if the AIR TOXICS command is used. Do not use this command
without the AIR TOXICS command.
Section: Scenario.
Description: This command allows users to specify the olefm content of gasoline on a volume
of fuel percentage basis.
Default: None.
Explanation: This is the percentage of olefm compounds in gasoline on a volume basis. An
olefm is a class of unsaturated hydrocarbons, such as ethylene, having the general
formula CnH2n and characterized by relatively great chemical activity. The value
supplied by the user should include all varieties of olefins that can appear in the
gasoline.
The valid range of inputs is from 0% to 30%. Any values outside of this range
will most likely lead to erroneous results. A typical value for this input is in the
range of 5 to 25 percent olefm compounds by volume. Wintertime values are
typically higher than summertime values.
Example: GAS OLEFIN% :15
This example specifies gasoline with 15% olefins by volume.
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2.8.10.7.c Volume Percent of Benzene in Gasoline
Name:
GAS BENZENE%
Status: Required, if the AIR TOXICS command is used. Do not use the command
without the AIR TOXICS command.
Section:
Scenario.
Description: This command allows users to specify the benzene content of gasoline on a
volume of fuel percentage basis.
Default:
None.
Explanation: This is the percentage of benzene compounds in gasoline on a volume basis. The
value supplied by the user should include all the benzene that can appear in the
gasoline.
The valid range of inputs is from 0% to 5% for conventional gasoline and 0% to
2% for Reformulated Gasoline. Any values outside of these ranges will most
likely lead to erroneous results. A typical value for this input is in the range of 0.2
to 3 percent benzene by volume.
Example: GAS BENZENE% : 1 .5
This example specifies gasoline with 1.5% benzene.
2.8.10.7.d Vapor Percentage of Gasoline at 200 Degrees Fahrenheit
Name:
E200
Status: Required, if the AIR TOXICS command is used. Do not use this command
without the AIR TOXICS command.
Section:
Scenario.
Description: This command allows users to specify the percentage of vapor of a given gasoline
fuel at 200 degrees F.
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Default:
None.
Explanation: This is a gasoline fuel volatility property that identifies the percentage of vapor of
a given gasoline fuel produces at 200 degrees F. This is a common parameter
reported in fuel and refinery statistics. The E200 parameter is entered into
MOBILE6.2 as a percentage.
The valid range of inputs is from 30% to 70%. Any values outside of this range
will most likely lead to erroneous results. A typical value for this input is in the
range of 35 percent to 55 percent.
Example: E200
:50
This example specifies gasoline with an E200 value of 50 percent.
2.8.10.7.e Vapor Percentage of Gasoline at 300 Degrees Fahrenheit
Name:
E300
Status: Required, if the AIR TOXICS command is used. Do not use this command
without the AIR TOXICS command.
Section:
Scenario.
Description: This command allows users to specify the percentage of vapor a given gasoline
fuel produces at 300 degrees F.
Default:
None.
Explanation: This is a gasoline fuel volatility property that identifies the percentage of vapor a
given gasoline fuel produces at 300 degree F. This is a common parameter
reported in fuel and refinery statistics. The E300 parameter is entered into
MOBILE6.2 as a percentage.
The valid range of inputs is from 70% to 100%. Any values outside of this range
will most likely lead to erroneous results. A typical value for this input is in the
range of 80 percent to 90 percent.
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Example: E300
:85
This example indicates gasoline with an E300 value of 85%.
2.8.10.7.f Oxygenated Fuels Command for Air Toxic Emission Calculations
Name:
OXYGENATE
Status: Required, if the AIR TOXICS command is used. Do not use this command
without the AIR TOXICS command
Section:
Scenario.
Description: This command is used to specify the particular gasoline fuel oxygenate type, the
fuel oxygenate content (in terms of percent by volume of the oxygenate), and the
market share of the particular oxygenate. Together with the RVP OXY WAIVER
command, it supercedes the OXYGENATED FUELS command, if the AIR
TOXICS command is used. The program will produce an error message if the
both the OXYGENATE and OXYGENATED FUELS commands are used in the
same run. Also, the OXYGENATE command cannot be used in conjunction with
the FUEL PROGRAM command equal to a value of '2' (an RFG program).
Default:
None.
Explanation: The OXYGENATE command requires fuel oxygenate content and market share
information on four gasoline fuel oxygenates. These are MTBE, ETBE, Ethanol
and TAME.
MTBE is Methyl Tertiary Butyl Ether.
ETBE is Ethyl Tertiary Butyl Ether.
ETOH is Ethanol or Ethyl Alcohol.
TAME is Tertiary Amine Methyl Ether.
The information must be entered on four separate sequential records. The first
record contains the command OXYGENATE in columns 1 through 20. The
parameters that follow in columns 21 and higher are the name of the oxygenate,
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the oxygenate content (expressed in volume percentage) in the fuel (see limits by
individual oxygenate), and the market share fraction of the oxygenate (ranges
from 0 to 1.0). The second through fourth records contain only the name of the
oxygenate, the oxygenate content by volume percentage in the fuel, and the
market share of the oxygenate beginning in column 21. The only valid oxygenate
names are: MTBE, ETBE, ETOH and TAME.
The valid range of fuel oxygen content is from 0 to 3.7% weight oxygen. This
translates to the following maximum in terms of oxygenate volume percentages:
MTBE
ETBE
Ethanol
TAME
20.7%
24.1%
10.7%
22.6%
Values outside of this range will produce invalid results. An example is given
below.
If an Air Toxics run is performed, the OXYGENATE command supercedes the
OXYGENATED FUELS command by weighting the MTBE, ETBE and TAME
oxygen levels by the market share, summing the result, and inserting it into the
program for the first and third parameters in the OXYGENATED FUELS
command. Likewise, the Ethanol market share and Ethanol oxygen level in the
OXYGENATE command are inserted for the second and fourth parameters in the
OXYGENATED FUELS command. For more details on the structure of the
OXYGENATED FUELS command please see Section 2.8.10.4.
Example: OXYGENATE
MTBE
ETBE
ETOH
TAME
15.1
17.6
10.0
6.0
0.50
0.05
0.45
0.00
Tips:
Note that MOBILE cannot model a situation where a single fuel contains more
than one oxygenate. For example a single fuel containing both MTBE and ETBE
cannot be modeled. The "market share" parameter allows for an area fuel supply
to consist of multiple fuels, each of which may contain one oxygenate.
If the four market share values do not add up to unity, MOBILE assumes that any
remaining portion does not contain an oxygenate.
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Oxygenate concentrations are sometime expressed in terms of the percentage by
weight of oxygen in the resulting fuel blend. The following factors can be used
to convert such data to be expressed in terms of percent by volume of the
oxygenate which is the form required for input to MOBILE:
Volume percent MTBE = Weight Percent Oxygen / .1786
Volume percent ETBE = Weight Percent Oxygen / .1533
Volume percent ETOH = Weight Percent Oxygen / .3448
Volume percent TAME = Weight Percent Oxygen / . 1636
These equations assume there is only a single oxygenate in the fuel.
2.8.10.7.g Oxygenated Fuels RVP Splash Blend Waiver
Name:
RVP OXY WAIVER
Status:
Optional. (Do not use this command without the AIR TOXICS command.)
Section:
Scenario.
Description: This command is used to specify whether a Reid vapor pressure (RVP) waiver has
been granted to allow "splash" blending of alcohol-based oxygenates. If a waiver
has not been granted (value = 1), then alcohol-based oxygenated fuels must meet
the same RVP requirements as non-oxygenated fuels sold in the area. If a waiver
has been granted (value = 2), then alcohol-based oxygenated fuels are allowed to
exceed the RVP requirements by up to 1 pound per square inch (psi), and the user-
input RVP is increased to account for the market share of the higher RVP fuel.
Default:
A value of' 1' or no waiver is the default
Explanation: If a waiver has not been granted (value =1), then alcohol-based oxygenated fuels
must meet the same RVP requirements as non-oxygenated fuels sold in the area. If
a waiver has been granted (value = 2), then alcohol-based oxygenated fuels are
allowed to exceed the RVP requirements by up to 1 pound per square inch (psi),
and the user-input RVP is increased to account for the market share of the higher
RVP fuel.
See OXYGENATED FUELS command (Section 2.8.10.3) for further details.
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Example: RVP OXY WAIVER
Tips:
This example indicates that no RVP splash blend waiver has been granted.
Note: If the market share of the oxygenated fuels is not 100%, then the average
RVP of fuel will be increased by a commingling effect from the mixing of
oxygenated and non-oxygenated fuels, even if there is no RVP waiver for
oxygenated fuels.
2.8.11 Alternative Emission Regulations and Control Measures
2.8.11.1 Disablement of the 1990 Clean Air Act Requirements
Name:
NO CLEAN AIR ACT
Status:
Optional.
Section:
Run.
Description: This command allows users to model vehicle emissions as if the Federal Clean
Air Act Amendments of 1990 had not been implemented. This command may be
used in conjunction with the modeling of state Rate of Progress (ROP) plans.
Default:
MOBILE6 assumes that the Clean Air Act (CAA)Amendments of 1990 did occur.
Explanation: MOBILE6 has been updated to include a number of vehicle and fuel requirements
mandated by the 1990 Clean Air Act Amendments. These include Tierl, low
emissions vehicle (LEV), and Tier2 tailpipe exhaust emission standards, and new
evaporative emission test procedure requirements. Nevertheless, for some
modeling purposes, emission factors for future calendar years in the absence of
the requirements imposed by the 1990 CAA amendments may be needed (e.g., to
support ROP plans).
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By using this command, the user can disable the following effects in MOBILE6:
The effect of all Federal exhaust tailpipe standards after TierO standards or
the 1993 model year will be shut off. All model years subsequent to the
1993 model year will be assigned the 1993 model year emission factor.
The 1993 model year was selected because it is the last year that was
unaffected by the CAA amendments.
The evaporative emission benefits from the Enhanced Evaporative Test
procedure will be eliminated. This affects running loss, diurnal, hot soak,
resting loss, and refueling emission factors.
The emission benefits from the Supplemental Federal Test Procedure for
both off-cycle and air-conditioning emission effects will be eliminated if
the command is issued.
The effects of OBD will be eliminated, and an OBD I/M program will not
be allowed. Evaporative OBD I/M programs are also not allowed when
this command is used. Only Exhaust and Evaporative I/M programs that
existed in calendar year 1990 can be modeled, and they can be modeled for
model years 1996 and later.
The fuel sulfur level is set to 300 parts per million (ppm) for all model
years greater than 1993.
The detergent gas emission effect is eliminated.
The 1995 model year tampering rates are extended past the 1995 model
year / calendar year. For these years, the rates that prevailed in the 1995
model year are used.
Cold temperature CO effects are affected. These will be set to 1993 model
year rates.
The following effects are NOT affected by the NO CLEAN AIR ACT command.
Heavy-duty vehicle off-cycle effects (defeat device), and heavy-duty
vehicle conversion factors are unaffected by this command.
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The MOBILE6 correction factors for average speed are unaffected by this
command.
Example:
Tips:
2.8.11.2
2.8.11.2.a
Name:
Status:
Section:
Description:
Facility cycle or roadway effects are unaffected by this command.
Fleet effects such as fleet turnover, changes in VMT between classes,
mileage accumulation effects, and registration distributions are unaffected
by this command.
NO CLEAN AIR ACT :
If this command is entered in conjunction with an I/M PROGRAM command, the
OBD I/M test type is not allowed for any model years. Only exhaust-based
emission tests are allowed, such as the IDLE, 2500/IDLE , or non-OBD
Evaporative test programs, such as the gas cap check. An error message will result
if the user enters an OBD-based I/M program, or if the user enters an I/M240 or
ASM type program.
When this command is used, the model year coverage for exhaust-based I/M
emission test programs may extend to 1996 and newer model years.
Heavy-Duty Diesel Vehicle NOx Off-Cycle Emission Effects
NO DEFEAT DEVICE
Optional.
Run
This command allows users to turn off the effects of the heavy-duty diesel vehicle
NOx off-cycle emission effects (defeat device emissions). It affects only NOx
emissions from vehicle classes 17 through 23, and has an appreciable emission
effect only on vehicle classes 22 and 23. It also only affects the NOx emission
results from calendar years 1989 through 2028 by affecting model years 1988
through 2003.
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Default: MOBILE6 uses national estimates to report the effects of off-cycle NOx
emissions from heavy-duty diesel vehicles. The default setting for this command
is to include these effects. IT IS RECOMMENDED THAT MOST USERS DO
NOT USE THE 'NO DEFEAT DEVICE' COMMAND.
Explanation: EPA's best estimate for the effects of heavy-duty vehicle NOx off-cycle emissions
has been programmed into MOBILE6 as the default input. Most users will not
need to model the anything other than the default emission effects which include
an off-cycle emission contribution. However, this command has been added to
MOBILE6 to allow users the ability to easily shut off the reporting of the NOx
off-cycle emissions should they need the capability.
Example: NO DEFEAT DEVICE :
This example directs MOBILE6 to NOT report the NOx off-cycle emission
effects.
Tips:
2.8.11.2.b
Name:
Status:
Section:
Description:
Care should be taken when using this command since it disables EPA's best
estimates for the effect of NOx off-cycle emissions. It also has interactive effects
with the other heavy-duty diesel vehicle NOx off-cycle commands. For example,
the NO DEFEAT DEVICE should not be used in conjunction with the other NOx
off-cycle commands such as "REBUILD EFFECTS", "NO REBUILD", and "NO
NOx PULL AHEAD". These command are invalid when used in conjunction
with the "NO DEFEAT DEVICE" command. This is because if there were NOx
off-cycle emissions produced by heavy-duty diesel vehicles, then there would no
need for the mitigation strategies such as Pull Ahead and Rebuild.
NO NOX PULL AHEAD
Optional.
Run
This command allows the user to turn off the effects of the Pull Ahead mitigation
program used to reduce heavy-duty diesel vehicle NOx off-cycle emissions. It
affects only NOx emissions from vehicle classes 17 through 23, and has an
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appreciable emission effect only on vehicle classes 22 and 23. It also only affects
the NOx emission results from model years 2002 and 2003.
Default: MOBILE6 uses national estimates to report the effects of off-cycle NOx
emissions pull ahead from heavy-duty diesel vehicles. The default setting for this
command is to include these effects. IT IS RECOMMENDED THAT MOST
USERS DO NOT USE THE 'NO NOX PULL AHEAD' COMMAND.
Explanation: EPA's best estimate for the effects of heavy-duty vehicle NOx off-cycle emissions
and the effects of the EPA Pull Ahead mitigation program have been programmed
into MOBILE6 as the default input. The Pull Ahead program modeled by
MOBILE6 is the best estimate at the time of the release of MOBILE6 of what the
actual program will achieve. It was assumed to have only partial compliance by
the engine manufacturers in both model year 2002 and 2003, and achieve an
average NOx emission standard of 6.0 g/bhp-hr for those vehicles which comply.
It does not give the user any capability to change the compliance rates, the
implementation schedule or the emission level of 6.0 g/bhp-hr.
Example: NO NOX PULL AHEAD :
This example directs MOBILE6 to NOT report the NOx off-cycle emission Pull
Ahead effects.
Tips:
Care should be taken when using this command since it disables EPA's best
estimates for the effect of the NOx off-cycle emissions mitigation strategy called
Pull Ahead. The command also has interactive effects with the "NO DEFEAT
DEVICE" command, and should not be used in conjunction with this command.
2.8.11.2.C
Name:
NO REBUILD
Status:
Optional.
Section:
Run
Description: This command allows the user to turn off the effects of the Rebuild mitigation
program used to reduce heavy-duty diesel vehicle NOx off-cycle emissions. It
affects only NOx emissions from vehicle classes 17 through 23, and has an
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appreciable emission effect only on vehicle classes 22 and 23. It also only affects
the NOx emission results from model years 1993 through 2003.
Default: MOBILE6 uses national estimates to report the effects of off-cycle NOx
emissions Rebuild program for heavy-duty diesel vehicles. The default setting for
this command is to include these effects at an effectiveness rate of 90%. IT IS
RECOMMENDED THAT MOST USERS DO NOT USE THE 'NO REBUILD'
COMMAND.
Explanation: EPA's best estimate for the effects of heavy-duty vehicle NOx off-cycle emissions
and the effects of the EPA Rebuild mitigation program have been programmed
into MOBILE6 as the default input. The Rebuild program modeled by
MOBILE6 is the best estimate at the time of the release of MOBILE6 of what the
actual program will achieve. It was assumed to have an effectiveness rate of 90
percent, cover 1994 through 2003 model years, begin after five years of service
for class 8a and 8b trucks and 12 years for medium duty diesel trucks, and rebuild
engines to a standard of 6.00 g/bhp-hr. The command does not give the user the
ability to change any of these parameters. The effective parameter (90%) can be
changed with the REBUILD EFFECTS command.
Example: NO REBUILD :
This example directs MOBILE6 to NOT report the NOx off-cycle emission
Rebuild program effects.
Tips:
Care should be taken when using this command since it disables EPA's best
estimates for the effect of the NOx off-cycle emissions mitigation strategy called
Rebuild. The command also has interactive effects with the "NO DEFEAT
DEVICE" command, and should not be used in conjunction with this command.
This command also cannot be used in conjunction with the command REBUILD
EFFECTS
2.8.11.2.d
Name:
REBUILD EFFECTS
Status:
Optional.
Section:
Run
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Description: This command allows the user to change the Rebuild program effectiveness rate
used to reduce heavy-duty diesel vehicle NOx off-cycle emissions. It affects only
NOx emissions from vehicle classes 17 through 23, and has an appreciable
emission effect only on vehicle classes 22 and 23. It also only affects the NOx
emission results from model years 1993 through 2003.
Default: MOBILE6 uses national estimates to report the effects of off-cycle NOx
emissions Rebuild program for heavy-duty diesel vehicles. The range of legal
values for this input parameter are 0.01 to 0.90. The default setting for this
command is to include these effects at an effectiveness rate of 90%. IT IS
RECOMMENDED THAT MOST USERS DO NOT USE THE 'REBUILD
EFFECTS' COMMAND.
Explanation: EPA's best estimate for the effects of heavy-duty vehicle NOx off-cycle emissions
and the effects of the EPA Rebuild mitigation program have been programmed
into MOBILE6 as the default input. This default effectiveness level is 90
percent.
Example: REBUILD EFFECTS
0.50
Tips:
This example directs MOBILE6 to use a rebuild effectiveness of 50%.
This command allows the user to vary the Rebuild Effectiveness to perhaps better
fit a local situation. However, it is unlikely that most users will have good local
data on this parameters, and are thus, encouraged to not use it.
2.8.11.3 Tier 2 Emission Standards and Fuel Requirements
The following commands override default settings for the Tier 2 emission standards and
fuel requirements.
2.8.11.3.a
Name:
NO TIER2
Status:
Optional
Section:
Run
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Description: This command allows the user to disable the Tier 2 emission standards and fuel
sulfur requirements.
Default: MOBILE6 accounts for the Tier 2 emission standards and fuel requirements if the
user does not use the NO TIER2 command.
Explanation: Use of the NO TIER2 command causes MOBILE6 to calculate emission factors
without the effects of the Tier 2 standards. MOBILE6 will continue modeling the
NLEV vehicle and truck program through 2050 with the default fuel sulfur levels
for calendar year 2000 (300 ppm for conventional gasoline, 150 ppm for
reformulated gasoline).
Example: NO TIER2 :
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2.8.11.3.b
Name:
T2 EVAP PHASE-IN
Status:
Optional
Section:
Run
Description: This command allows the user to replace the default phase-in fractions (by
certification bin) for the Tier 2 evaporative emission standards, allowing different
phase-in schedules to be modeled. This command is also necessary to model the
evaporative emission effects of California's LEV II requirement.
Default:
MOBILE6 uses the default Tier2 certification standard phase-in schedule.
Explanation: The T2 EVAP PHASE-IN command specifies an external input file containing
values that will override the default Tier 2 phase-in fractions. The input file used
in conjunction with the T2 EVAP PHASE-IN command must begin with T2
EVAP PHASE-IN on the first line. Beginning with the second line, the input file
contains a delimited data matrix of 12 columns by 5 rows. The columns reflect
model years 2004 through 2015, inclusive. The rows reflect phase-in percentages
by the 5 light-duty vehicle classes (LDV/LDT1/LDT2/LDT3/LDT4). Either
commas or spaces may be used to separate values.
The input file called by T2 EVAP PHASE-IN will read in phase-in fractions for
each light-duty vehicle type for model years 2004 through 2015, inclusive. Each
of the phase-in fractions must be between zero and one, inclusive. The sum of the
phase-in fractions must be between 0.999 and 1.001 (inclusive) for a given
vehicle, model year, and pollutant, or the input data will be rejected and the
previously stored values will be used. An error message will be sent to the
descriptive output when the user supplied input for the alternate Tier2 phase-in
fractions has been rejected.
If modeling the effect of zero-emitting vehicles (ZEVs), the user needs to specify
the percentage of ZEVs under the 94+ LDG IMP command discussed in section
2.8.11.4, and use the T2 EVAP PHASE-IN command to assign the phase-in
schedule for non-ZEVs. In this scenario the non-ZEV phase-in fractions have to
be normalized in the input file containing the phase-in schedule so that they sum
to one across vehicle class and model year.
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Example: T2 EVAP PHASE-IN : T2EVAP.D
2.8.11.3.c
Name:
T2 EXH PHASE-IN
Status:
Optional
Section:
Run
Description: This command allows the user to replace the default phase-in fractions (by
certification bin) for the Tier 2 exhaust emission standards, allowing different
phase-in schedules to be modeled. This command is also necessary to model the
exhaust emission effects of California's LEV n requirement.
Default:
MOBILE6 uses the default Tier2 certification standard phase-in schedule.
Explanation: The input file used in conjunction with the T2 EXH PHASE-IN command must
begin with T2 EXH PHASE-IN on the first line. Beginning with the second line,
the input file contains a delimited data matrix of 12 columns by 180 rows. Either
commas or spaces may be used to separate values. The columns reflect model
years 2004 through 2015, inclusive. The rows reflect phase-in percentages by a)
12 certification bins, b) 3 pollutants (HC/CO/NOx), and c) 5 light-duty vehicle
classes (LDV/LDT1/LDT2/LDT3/LDT4). For example, the first 12 rows of the
matrix contain bins 1-12 for LDV HC; the second 12 rows contain bins 1-12 for
LDV CO; the third 12 rows contain bins 1-12 for LDV NOx; the fourth 12 rows
contain bins 1-12 for LDT1 HC, etc.
In terms of model operation, each fraction must be between zero and one,
(inclusive). The sum of the phase-in fractions must be between 0.999 and 1.001
(inclusive) for a given vehicle class, model year, and pollutant, or the input data
will be rejected and the previously stored values will be used. An error message
will be generated when the user-supplied input for the alternate Tier2 phase-in
fractions has been rejected. Beyond model execution, the user must ensure that
alternate phase-in assumptions for the Tier 2 requirement satisfy the fleet-average
and minimum phase-in provisions of the Tier 2 rule; MOBILE6 does not check
for the latter condition. As discussed in the MOBILE6 technical report
M6.EXH.004, the Tier 2 requirement contains 10 actual certification bins; 8
"final", and 2 "interim". Bins 1-8 are the final bins (lowest standard to highest),
and Bins 9-10 are the interim standards. Under the default scenario of
MOBILE6, Bins 11-12 are used only to account for provisions of the HC interim
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standards for LDT3s and LDT4s which necessitate multiple standards being
assigned to one bin. The user can "activate" these bins through the T2 CERT
command (discussed in section 2.8.11.3.d).
Under the default condition, the certification standard for Bin 1 is 0. However,
zero-emitting vehicles (ZEVs) should not be assigned to this bin, because overall
emissions as calculated by MOBILE6 will not be zero. Instead, the user would
need to specify the percentage of ZEVs under the 94+ LDG IMP command
discussed in section 2.8.11.4, and use the T2 EXH PHASE-IN command to
apportion the non-ZEVs in Bins 2-10. In this scenario the non-ZEV phase-in
fractions would have to be normalized in the input file containing the phase-in
schedule so that they sum to one across vehicle class, model year, and pollutant.
Example:
2.8.11.3.d
T2 EXH PHASE-IN : T2EXH.D
Name:
T2 CERT
Status:
Optional
Section:
Run
Description: This command allows the user to specify alternative Tier 2 50,000 mile
certification standards and must be used to model the effects of California's LEV
II requirement. Since the standards under the Tier 2 rule are final and therefore
static, the intended use of this command is to model the effects of California's
LEV n program.
Default:
MOBILE6 uses the default Tier2 certification standards.
Explanation: The T2 CERT command is used to specify an external input file containing values
that will override the default Tier 2 certification standards. The input file called by
T2 CERT will read in 50,000 mile certification standards for each of the 10
certification "bins" (interim and final) for each light-duty vehicle type (Classes 1
through 5) and pollutant (HC, CO and NOx). The Tier 2 requirement contains 10
actual certification bins; 8 "final", and 2 "interim". Bins 1-8 are the final bins
(lowest standard to highest), and Bins 9-10 are the interim standards. Under the
default scenario of MOBILE6, bins 11-12 are used only to account for provisions
of the HC interim standards for LDT3s and LDT4s which necessitate multiple
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standards being assigned to one bin. The user can "activate" these bins through
the T2 CERT command, a necessary step for modeling the California LEV II
program.
The alternate certification standards supplied under T2 CERT are checked to
ensure that they are greater than or equal to zero. Negative values or missing
values result in all user supplied input values being rejected. An error message
will be sent to the descriptive output when user supplied input has been rejected.
T2 CERT requires an external file which supplies alternate 50,000 mile exhaust
certification standards for Bins 1-12.
The input file used in conjunction with the T2 CERT command must begin with
T2 CERT on the first line. Beginning with the second line, the input file contains
3 separate delimited data matrices of 5 columns by 12 rows. Either commas or
spaces may be used to separate values. The columns reflect 5 light-duty vehicle
classes (LDV/LDT1/LDT2/LDT3/LDT4). The rows reflect Bins 1-12. Each
matrix represents a pollutant (HC, CO, NOx), and is separated by a space. The
entries in each matrix "cell" are the 50,000 miles certification standard for the
appropriate bin, vehicle class and pollutant.
Example: T2 CERT: T2CERT.D
2.8.11.4 Alterative Schedule for 1994 and Later Model Year Light Duty Gasoline
Vehicle Standards
Name:
94+ LOG IMP
Status:
Optional
Section:
Run
Description: This command allows the user to input optional 1994 and later fleet penetration
fractions for light-duty gasoline vehicles under the Tier 1, NLEV (or California
LEV 1), and Tier 2 emission standard programs.
Default: MOBILE6 uses the default certification standard phase-in schedule for the Tier 1,
NLEV and Tier 2 programs.
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Explanation: This command allows for optional user input of light-duty gas 1994+ model year
emission standard implementation values. These values are fleet penetration
fractions of the eleven vehicle certification standard categories under the Tier 1,
NLEV (or California LEV I), and Tier 2 vehicle emission programs. For a given
model year and light-duty gas vehicle type the eleven fractions must add up to
1.000. The standards types are:
1. TierO
2. Intermediate Tierl
3. Tierl
4. Tier2
5. Intermediate TLEV
6. TLEV
7. Intermediate LEV I
8. LEV I
9. Intermediate ULEVI
10. ULEV I
11. ZEV (zero emitting vehicle)
It should be noted that the category "Tier 2" under this command only denotes the
fraction of light-duty vehicles and trucks participating in the Tier 2 program. The
full "bin" implementation of the Tier 2 vehicle program (or LEV II program)
would be modeled using the Tier 2 input commands discussed in Section 2.8.11.3.
However, this command must be used to model the effect of zero-emitting
vehicles under the LEV I or LEV n programs.
MOBILE6 does not have separate emission estimates for the intermediate useful
life standards. The "intermediate" standard level categories use the emission
estimates for the final category; e.g., Intermediate Tierl type uses the Tierl
emission level.
The input file used in conjunction with the 94+ LDG IMP command must begin
with 94+ LDG IMP on the first line. After this, the required data are divided into 5
blocks, one each for LDGV, LDGT1, LDGT2, LDGT3, and LDGT4. In each data
block there is one data line for each calendar year from 1994 to 2025. Each line
contains the phase-in values for that year for the 11 different vehicle standards
categories, according to the list above. Those values for a given model year and
vehicle type must sum to 1. The data for a given row (model year and vehicle
type) must use the following FORTRAN fixed format:
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F5.3,10(1X,F5.3)
Example: 94+ LOG IMP : P94IMP.D
2.8.11.5 2007 Heavy Duty Vehicle Emissions Reductions
The following command overrides the default settings for the 2007 Heavy Duty Vehicle
emission standards.
Name: NO 2007 HDDV RULE
Status: Optional
Section: Run
Description: This command allows the user to disable the 2007 heavy duty vehicle emission
standards.
Default: MOBILE6 will account for the 2007 heavy duty vehicle emission standards if the
user does not use the NO 2007 HDDV RULE command.
Explanation: Use of the NO 2007 HDDV RULE command causes MOBILE6 to calculate
emission factors without the effects of the 2007 heavy duty vehicle emission
standards. These standards and the associated lower sulfur diesel fuels will begin
effecting emissions in 2008 and will be fully implemented in all vehicles
manufactured in 2009 and subsequent years. The interplay of this command with
the NO TIER2 command is illustrated in the Tables below.
Example: NO 2007 HDDV RULE :
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Effects of Applying the NO HD2007 RULE and NO TIER2 Commands
On Heavy Duty Gasoline Vehicle Emissions
GASOLINE FUELED HEAVY TRUCKS
NO TIER2
NO HD2007
Not Applied
Not Applied
EXHAUST: This is the default case
with emissions reduced starting in
2005 according to the 2005 heavy
duty rule and any Tier2 effects.
Another reduction in 2008 which
accounts for phase in of the heavy
duty 2007 rules. The last reduction
is in 2009.
EVAPORATIVE: This default case
includes the effects of Tier2 and
the heavy duty vehicle (HDV) rules.
Applied
Not Applied
EXHAUST: In this case only the 2007
heavy duty step-wise emissions
reductions occur in 2008 and in
2009. There are no emissions
reductions in the earlier years,
2005 through 2007. This essentially
removes any Tier2 and 2005 heavy
duty rule emissions reductions.
EVAPORATIVE: This shuts off the
effects of HDV and Tier2 rules.
Not Applied
Applied
EXHAUST: Except for the HDG2B's, a
single step-wise reduction occurs
in 2005 which is equivalent to the
default reduction in 2005 for each
particular vehicle type. This
reduction is due to the 2005 rule.
No further reductions occur in
subsequent years.
The HDGV2B's are reduced according
to the 2005 rule and Tier2 effects.
The Tier2 effects are applied to a
subset of HDGV2B's, i.e., medium
duty passenger vehicles.
EVAPORATIVE: This shuts off the
effects the HDV and Tier2 rules.
Applied
Applied
EXHAUST: No emissions reductions
occur. This combination of commands
effectively shuts off the Tier2 and
both heavy duty vehicle rules. The
emissions rates for all years
subsequent to 2004 remain at the
2004 levels.
EVAPORATIVE: This shuts off the
effects of the HDV and Tier2 rules.
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Effects of Applying The NO HD2007 RULE and NO TIER2 Commands
On Heavy Duty Diesel Vehicle Emissions
DIESEL FUELED HEAVY TRUCKS
NO TIER2
Not Applied
Applied
Not Applied
Applied
NO HD2007
Not Applied
Not Applied
Applied
Applied
This is the default case with two
step-wise emission reductions. The
first starting in 2004. The second
reduction is in 2007. This second
reduction is due to the 2007 heavy
duty diesel rule.
This is the same as the default
case .
This command removes the 2007 heavy
duty diesel rule. A single
reduction occurs which goes into
effect in 2004. These reduced
emission rates begin in 2004 and
remain in effect for all years
proceeding 2004 . These emission
rates are identical to those that
take place in 2004 for the default
case .
This is the same as the above case
whereby emissions are reduced in
2004 and remain at that level for
all subsequent model years.
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CHAPTER 3
MOBILE6 OUTPUTS
3.0 INTRODUCTION
This chapter describes the output that can be produced by the MOBILE6 highway vehicle
emission factor model. There are five basic kinds of output:
1. Database Output Report.
2. Descriptive Output Reports.
3. Spreadsheet Output.
4. Warning and Error Messages.
5. User Screen Dialog.
The database output report contains detailed emission results in a form suitable for use
with database management or spreadsheet software.
The descriptive output reports contain summary-level emission results in a format
suitable for printing. These reports also contain any non-fatal warning or comment messages
pertaining to user-supplied input values.
The spreadsheet output reports the same level of detail as the description output in a form
easily imported into spreadsheet software.
During execution of the MOBILE6 program, a few simple prompting and status messages
are displayed on the computer screen. Certain error messages related to the interaction between
the computer software operating system and the MOBILE6 program might also appear on the
screen. Fatal error messages are written to a separate error report file.
3.1 DATABASE OUTPUT REPORT
The user can (by using the DATABASE OUTPUT command) create a tab-separated
variable, ASCII text file, which can then be imported into various database or spreadsheet
programs. Database output is not produced unless this command is specified in the Header
section of the command input file. By default, the database output file is given the base name of
the command input file with a ".TB1" file name extension. The user can give the file any desired
DOS file name by using the EMISSIONS TABLE command.
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3.1.1 Database Output Formatting Options
The database output has three forms. The first is the default form in an hourly format,
which reports all emission factors for each hour of the 24-hour day. This output is often quite
voluminous and is suitable only for use with database management software. The second form is
a daily format, which summarizes the hourly information into emission factors pertaining to the
entire 24-hour day. This significantly reduces the amount of output produced and often produces
output that can be analyzed with spreadsheet software. The third form is aggregated format,
which aggregates the daily results into values similar to those reported in the descriptive output
report(s). By default (assuming the DATABASE OUTPUT command has been specified),
MOBILE6 produces the hourly format. The DAILY OUTPUT or the AGGREGATED OUTPUT
command can be specified in the Header section of the command input file to produce the daily
or aggregated database format instead. The user cannot specify both the DAILY OUTPUT and
the AGGREGATED OUTPUT commands in the same MOBILE6 input file.
By default, the database output table, whether in hourly, daily, or aggregated format, is a
purely "flat" file, in which every record has the same format and contains only result information.
The WITH FIELDNAMES command can be used to add an initial record to the database output
file containing short names for each column of information it contains.
The hourly database output file contains 22 fields; the daily format contains 18 of these.
The aggregated format contains only 13 fields. The fields can be divided into three groups: key
fields, echoed fields, and calculated fields. In the following section, command input refers to
non-batch input.
3.1.1.1 Key Fields
These nine key fields serve, in combination, to uniquely identify a particular record in
the output.
File Number (FILE). The number of the command input file, beginning with 1.
Batch input files may contain more than one command input file.
Run Number (RUN). The run number within the input file, beginning with 1.
Command input files may contain multiple runs.
Scenario Number (SCEN). The scenario number within the run, beginning with 1. Runs
may contain multiple scenarios.
Hour of the Day (HOUR). 1 through 24. Hour "1" begins at 6:00 a.m. and
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extends until 7:00 a.m.. This field is not present in the daily or aggregated format.
Vehicle Type (VTYPE). Values 1 through 28 as shown Table 3, Appendix B.
Vehicle Age in Years (AGE). 0 through 24. This age is relative to the calendar year for
which the scenario is being run. Age value 24 represents vehicles of age 24 or more. This
field is not present in the aggregated format.
Pollutants (POL). Values of 1 through 15, as listed in table 1.2.6.
Emission Types (ETYPE). Values of 1 through 10.
1. Exhaust emissions nominally from running operations, including start
emissions from heavy-duty vehicles and start emissions of pollutants other
than HC, CO, and NOx. (All exhaust emissions not included in type 2 below.)
2. HC, CO, and NOx exhaust emissions from the engine start operations of light-
duty vehicles and motorcycles.
NOTE: Emission types 1 and 2 are used somewhat differently in the database output than
in the descriptive output, in which the exhaust HC, CO, and NOx emissions of heavy-
duty vehicles are reported only as "composite" exhaust results, not as either start or
running.
3. Evaporative emissions from hot soak conditions.
4. Evaporative emissions from diurnal conditions.
5. Evaporative emissions from resting loss conditions.
6. Evaporative emissions from running loss conditions.
7. Evaporative emissions from crankcase emissions.
8. Evaporative emissions from refueling conditions.
9. Particulate emissions from brake wear.
10. Particulate emissions from tire wear.
This field is not present in the aggregated format.
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Roadway or "Facility" Types (FTYPE) (1 through 5).
1. Freeway.
2. Arterial.
3. Local.
4. Ramp.
5. None or "not applicable" (e.g., for emissions independent of facility type, such
as engine start emissions and most evaporative emission types.)
This field is not present in the aggregated format.
3.1.1.2 Echoed Fields Carried To Output From Input
Eleven fields of the database output are "echoed" from MOBILE6 inputs. It is important
for users to understand that these information items are not substantively calculated or modeled
by MOBILE6they are essentially independent rather than dependent variables. They are
provided in the database output to facilitate conversion of the emission factor results into
alternative units, such as grams per engine start, grams per gallon, and so on. These fields also
are provided to facilitate the calculation of average emissions for nonstandard combinations of
vehicle types.
The "echoed" fields include the following:
STARTS: The average number of engine starts per vehicle in the time period (hour
or day) represented by the record.
ENDS: The average number of trip ends per vehicle in the time period (hour or
day) represented by the record. The number of trip ENDS is generally less than the
number of STARTS because very short periods of engine operation are not
considered a "trip" by MOBILE6 in calculating hot soak emissions.
MILES: Miles traveled per vehicle of this type and age in the time period (hour or
day) represented by the record.
MPG: Miles per gallon per vehicle of this type.
HRVMT: Percentage of daily vehicle miles traveled, for all vehicles combined, in the
hour to which this record pertains. This field is not present in the daily or aggregated
database output.
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FACVMT: Percentage of vehicle miles traveled in the time period (day or hour)
represented by this record on the indicated facility (roadway type). This field is not
present in the aggregated format.
REG_DIST: Percentage of vehicles of this type (from VTYPE field) that are of this
age (from the AGE field). This field is not present in the aggregated format.
VCOUNT: Number of vehicles of each VTYPE used by MOBILE6 to calculate
these results. Note: The absolute number of vehicles is not significant in
MOBILE6, which expresses all emission results on a per-vehicle basis. Ratios or
percentages of VCOUNT numbers can be useful, however, when combining
vehicle classes. This field is not present in the aggregated format.
AMBTEMP: Ambient temperature during this hour expressed in degrees Fahrenheit.
This field is not present in the daily output format or the aggregated format.
DIURTEMP: Temperature used for diurnal evaporative emission calculations
during this hour, expressed in degrees Fahrenheit. Normally, this equals
AMBTEMP, but it may differ if the user has supplied alternate hourly temperature
information. This field is not present in the daily or aggregated output format.
MYR: Model Year. This is calculated as Calendar Year - Age. This field is not
present in the aggregated output.
The aggregated output includes an echoed fieldthe fraction of vehicle miles
traveled (VMT)which is not included in either the hourly or daily format.
The aggregated output includes another echoed fieldcalendar year
(CAL_YEAR)which is not included in either the hourly or daily format.
3.1.1.3 Calculated Fields
These two fields are calculated by the MOBILE6 model.
G_MI: Emissions of the given emission type and pollutant on the given facility
(roadway) type during the given time period (hour or day) in grams per mile per
average vehicle of the given type (e.g., LDGV) and age.
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G_HR or G_DAY: Emissions of the given emission type and pollutant on the given
facility (roadway) type in grams per hour or day per average vehicle of the given type
and age.
NOTE: These calculated values are emission rates. They are not simple mass values that
can easily be summed up. Calculations that involve combinations of these values require
that proper weighting factors are used.
In the aggregated format option, the content of the calculated fields can be controlled by
the DATABASE EMISSIONS and NO REFUELING commands. By default, the aggregated
results are the sum of all emissions for all vehicle ages and roadway types. Using the
DATABASE EMISSIONS or NO REFUELING command, the emission types included in the
aggregated results can be restricted.
3.1.2 Database Output Structure
The database output file is a highly "flattened" table structure. As a result, many of its
non-key field values do not depend upon all of its key fields. In database design terms, the table
is not "normalized" because it violates the rule for "second normal form." Users should
understand these field dependencies (or the lack of them) when working with the database output
tables. All of the non-key fields depend upon FILE, RUN, and SCEN. Beyond this, their
dependencies are as follows:
CAL_YEAR depends upon no other field.
STARTS and ENDS depend only upon HOUR (if present), VTYPE, and AGE (though
the default input data does not vary by age).
MILES depends only upon HOUR (if present), VTYPE and AGE.
MPG depends only upon VTYPE and AGE.
HRVMT depends only upon HOUR.
FACVMT depends only upon HOUR (if present), VTYPE, and FTYPE.
. REG_DIST depends only upon VTYPE and AGE.
VCOUNT depends only upon VTYPE.
AMBTEMP and DIURTEMP depend only upon HOUR.
G_MI, G_HR and G_DAY depend upon all the key fields.
VMT depends upon VTYPE.
MYR depends upon AGE.
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3.1.3 Restricting the Set of Database Output Records Produced
If users request hourly database output and do nothing to restrict which records are
produced, MOBILE6 produces a truly huge output file (about 35 megabytes per scenario).
Therefore, users are advised to limit their requested data by using commands that restrict the set
of output records produced.
The POLLUTANTS, PARTICULATES, and AIR TOXICS commands limit which of the
18 MOBILE6.0 pollutants records are produced and affects the descriptive output.
The DATABASE AGES command specifies which of the 25 vehicle ages are reported in
the hourly or daily database output formats.
The DATABASE EMISSIONS command specifies which of the ten emission types
records are produced.
The DATABASE FACILITIES command specifies which of the five values of facility
type records are produced.
The DATABASE HOURS command specifies which of the 24 hours are reported in the
hourly format of the database output.
The DATABASE VEHICLES command specifies which of the 28 vehicle types records
are produced.
The DATABASE YEARS command specifies which of the 25 model years are reported
in the hourly or daily database output formats.
The DAILY OUTPUT command may be used to produce output in which the hourly data
is aggregated to the daily level (see Section 2.8.5.1J). This reduces the volume of the database
output by a factor of about 30. Any combination of the above commands can be used.
The AGGREGATED OUTPUT command option allows the user to further aggregate the
daily results by age, roadway, and emission type. The output can be further reduced by
restricting the vehicle classes and the pollutants to be written using the DATABASE
VEHICLES, POLLUTANTS, PARTICULATES, and AIR TOXICS commands.
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3.2 DESCRIPTIVE OUTPUT
The default output for MOBILE6 is a basic descriptive output report for HC, CO, and
NOx that includes (following any warning messages and some introductory scenario identifying
information) only the composite emission rates calculated for the eight basic vehicle classes.
Several of these classes are combinations of individual vehicle classes and are explained later in
this section. If the user asks for CO2 results they are added to this output. If the user specifies
the PARTICULATES command, a similar report is produced for particulate matter and related
pollutants, unless MOBILE6 is directed otherwise by other commands. If the user specifies the
AIR TOXICS command, a similar report is produced for the air toxic pollutants, unless
MOBILE6 is directed otherwise by other commands.
By default, the HC, CO, NOx, and CO2 descriptive output file is given the base name of
the command input file with a ".TXT" file name extension, the particulate report is given the
same base filename with an extension of.PM", and the air toxics report is given the same base
filename with the extension of ".TOX". The user can give the files any desired DOS file name
with the REPORT FILE command.
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A sample MOBILE6 HC, CO, and NOx descriptive output file is shown below in Figure
1:
Figure 1
MOBILES (28-Aug-2000)
Input file: TESTAIR4.IN (file 1, run 1).
M603 Comment:
User has disabled the calculation of REFUELING emissions.
*#########################
* File 1, Run 1, Scenario 1.
*#########################
M 48 Warning:
there are no sales for vehicle class HDGVSb
Calendar Year: 2000
Month: Jan.
Altitude: Low
Minimum Temperature: 60. (F)
Maximum Temperature: 84. (F)
Nominal Fuel RVP: 11.5 psi
Weathered RVP: 11.2 psi
Fuel Sulfur Content: 300. ppm
I/M Program: No
ATP Program: No
Reformulated Gas: No
Following assumptions made for air conditioning adjustments:
Absolute Humidity: 75. grains/lb
Sun rise at 600; Sun set at 2100
Peak sun occurring between 1000 and 1600.
Fraction of cloud cover equal to 0.00
Vehicle Type: LDGV LDGT12 LDGT34 LDGT HDGV LDDV LDDT HDDV MC All Veh
GVWR: <6000 >6000 (All)
VMT Distribution
Composite Emission
Composite THC
Composite CO
Composite NOX
: 0.494
Factors (g/mi)
: 2 .45
: 29.38
: 1.33
0.283
2 .57
35.34
1.46
0.097
3 .92
49.07
1.85
2 .92
38 .84
1.56
0.036
3 .30
36 .05
5.10
0.001
0.76
1.77
1.81
0.002
0.92
1.65
1.81
0.081
0.82
4.25
18 .47
0.006
2 .93
14.73
1.25
1
2.
30.
2.
.000
.524
.997
.948
The main portion of these reports is essentially a table with rows that represent different
kinds (or combinations of kinds) of emissions and columns that are vehicle types (or
combinations of vehicle types). This information is at a much more summary level than in the
database output. In particular, the descriptive output values are always aggregates, derived from
the sum of hour, facility (roadway) type, and age. If detailed information is needed by hour,
facility (roadway) type, or age, then the database output must be used. A detailed description of
the meaning of these terms is found in Section 3.1.
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3.2.1 Descriptive Output Formatting Options
Users can suppress all descriptive outputs by including an optional command, NO DESC
OUTPUT, in the Header portion of the command input file. The user must specify in this case
that database or spreadsheet output be produced. Otherwise, the model will run without reporting
any results.
Users can produce an expanded list of exhaust emission rates (engine start and running)
in the HC, CO, and NOx report by including an optional run-level command, EXPAND
EXHAUST, in the command input file. These values are in addition to the basic descriptive
output of composite emission rates. The start and running exhaust emissions are split for only the
LDVs and LDTs. A total exhaust line is also printed that is the simple sum of the start and
running exhaust emissions. The total exhaust differs from the composite for any HC output for
gasoline vehicles. This is because the composite values include evaporative emissions, while the
total exhaust values do not.
Users can produce expanded rows, detailing the evaporative emissions by type, in the HC,
CO, and NOx report by including the optional run-level command, EXPAND EVAP, in the
command input file. These values are in addition to the basic descriptive output of composite
emission rates. (This expansion is always produced in the descriptive output for air toxics.)
Users can produce an extra section of descriptive light-duty truck emission rates by
weight (LDGT1, LDGT2, LDGT3, LDGT4, LDDT12, and LDDT34) in any descriptive output
reports being produced by including an optional run-level command, EXPAND LDT EPS, in the
command input file. The user will get the basic descriptive output (composite) emission rates for
these vehicle classes. This additional section will also be affected by the user options for
expanded exhaust or evaporative emissions, as well as by user options controlling pollutants and
speciation.
Users can produce an extra section of descriptive heavy-duty gasoline fueled truck
emission rates by weight in all descriptive output reports being produced by including an optional
run-level command, EXPAND HDGV EPS, in the command input file. Users will get the basic
descriptive output (composite) emission rates for these vehicle classes. This additional section
will also be affected by user options for expanded exhaust or evaporative emissions, as well as by
user options controlling pollutants and speciation.
Users can produce an extra section of descriptive heavy-duty diesel-fueled truck emission
rates by weight in all descriptive output reports being produced by including an optional run-
level command, EXPAND HDDV EPS, in the command input file. Users will get the basic
descriptive output (composite) emission rates for these vehicle classes. This additional section
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will also be affected by user options for expanded exhaust or evaporative emissions, as well as by
user options controlling pollutants and speciation.
Users can produce an extra section of descriptive diesel- and gasoline-fueled bus
emission rates (both school bus and transit bus) in all descriptive output reports being produced
by including an optional run-level command, EXPAND BUS EPS, in the command input file.
Users will get the basic descriptive output (composite) emission rates for these vehicle classes.
This additional section will also be affected by user options for expanded exhaust or evaporative
emissions, as well as by user options controlling pollutants and speciation.
Users can select which pollutants will appear in all of the descriptive output options for
the HC, CO, and NOx report by including an optional command, POLLUTANTS, in the Header
portion of the command input file. This option will allow any combination of pollutants (e.g., HC
and NOX) and will suppress the output of pollutants not selected. The default is to include all
pollutants (HC, CO and NOX). It should be noted that not selecting HC when using the
POLLUTANTS command will result in MOBILE6 not reporting any HC emissions, even if the
user has specified the reporting of expanded evaporative emission rates.
Users may select which variety of HC emissions (THC, NMHC, VOC, TOG, and
NMOG) will be calculated and reported in the descriptive output by including one of five
optional run-level commands (EXPRESS HC AS ...) in the command input file. The default
value for HC speciation is VOC. The descriptive output labeling reflects the selection of species
by the user.
Users may select which PM and related emissions are reported in the descriptive output
report for these pollutants by using the PARTICULATES command. Users may select which air
toxic pollutant emissions are reported in the descriptive output report by using the AIR TOXICS
command.
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3.2.2 Explanation Of Additional Items in the Descriptive Output
The HC, CO, and NOx descriptive output report includes a preliminary information
section containing:
Calendar year.
Evaluation month.
Altitude.
Minimum and maximum temperatures.
Absolute humidity.
Nominal fuel RVP (user-supplied).
Weathered RVP.
Gasoline fuel sulfur content.
I/M and reformulated gasoline program information.
The minimum and maximum temperatures reported in this section are selected from the
hourly temperaturesif the user supplies hourly temperatures. Otherwise, they are the values
specified by the user with the MIN/MAX TEMP command.
The descriptive output report for particulate matter and related pollutants includes a
similar preliminary information section containing items relevant to the calculation of these
pollutants, including:
Calendar year.
Evaluation month.
Gasoline fuel sulfur content.
Diesel fuel sulfur content.
Particle size cutoff.
Whether a reformulated gasoline program is in effect.
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The descriptive output report for air toxic pollutants also includes a similar preliminary
information section containing items relevant to the calculation of these pollutants, including:
Calendar year.
Evaluation month.
Market weighted oxygen level of gasoline.
Gasoline fuel sulfur content.
Maximum temperature.
Minimum temperature.
Weathered RVP.
Gasoline vapor percentage at 200 degrees F.
Gasoline vapor percentage at 300 degrees F.
Aromatics content of gasoline.
Olefins content of gasoline.
Benzene content of gasoline.
MTBE content of gasoline.
ETBE content of gasoline.
Ethanol content of gasoline.
TAME content of gasoline.
The vehicle classes and combinations of classes that appear in the default descriptive
outputs are listed below:
LDGV.
LDGT 1 and 2 together (LDGT 1-2).
LDGT 3 and 4 together (LDGT 3-4).
LDGT 1,2, 3, and 4 together (LDGT).
LDDV.
LDDT 1,2, 3, and 4 together (LDDT).
All HDGV and HDGB together (HDG).
All HDDV and HDDB together (HDD).
All 28 subtypes together: (All Vehicles).
All 28 sub-type classes (LDGV, LDGT1, LDGT2, LDGT3, LDGT4, HDGV2b, HDGV3,
HDGV4, HDGV5, HDGV6, HDGV7, HDGVSa, HDGVSb, LDDVl-2,LDDTl-2, HDDV2b,
HDDV3, HDDV4, HDDV5, HDDV6, HDDV7, HDDVSa, HDDVSb, MC, HDGB, HDDB-T,
HDDB-S, LDDT3-4.) can appear, separately, in the descriptive output with the use of the
EXPAND LOT EFS, EXPAND HDGV EFS, EXPAND HDDV EFS, and EXPAND BUS EFS
commands.
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Any comments that users place after the RUN DATA Command, beginning with the
"greater than" symbol, are echoed to the HC, CO, NOx descriptive output immediately after the
Run section and before any error or warning messages or any other type of program output. There
are other options for users to annotate the output using comments in the command input file as
explained in Chapter 2.
To obtain "by-model-year" results, users must specify the database output (see Sections
2.8.5.1 and 3.1).
3.3 SPREADSHEET OUTPUT REPORT
This form of output is new in MOBILE6.1/6.2. It is available for all MOBILE6
pollutants, including HC, CO, and NOx. It produces a tab-delimited ASCII text file containing
essentially the same information as is reported in the descriptive outputs (.TXT, .PM, and .TOX
files). Information for all pollutants is combined into a single output file having the filename
extension of ".TAB".
Whereas the descriptive output reports are designed to be read or printed, this form of
output is ideal for loading into spreadsheet software such as Lotusl23 or Excel.
All that is necessary to produce this additional output file is to specify the SPREADSHEET
command in the header of the MOBILE6 input file.
For additional information please refer to the description of the SPREADSHEET
command in section 2.8.4.2.
3.4 WARNING AND ERROR MESSAGES
Diagnostic messages are used to caution users concerning user-supplied information.
They are written to an error message file or the descriptive output (.TXT) file and are produced
even if the NO DESC OUTPUT command has been specified.
There are three types of diagnostic messages: errors, warnings, and comments. Errors are
reported to a file named m6error.txt. An error will in all cases terminate processing of the
current scenario; in most cases, it will terminate processing of the entire run. In such cases,
however, the program will print out all error messages for the run, not just the first one.
Warnings and comments are included to help users interpret the results.
Error messages indicate either that invalid input data were entered into MOBILE6, or that
MOBILE6 attempted to perform invalid operations. If the error message is due to an input value
that is out of bounds, the range of acceptable values is also printed.
Warning messages indicate that MOBILE6 input data caused an operation not necessarily
intended by the user, although the situation is not serious enough to necessarily be considered an
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error. Nonetheless, users should examine the warning messages to ascertain the conditions that
were modeled because these may be different from what was expected.
Comments are a type of diagnostic warning message that are printed for the user's
information. Neither a warning nor a comment will stop a MOBILE6 run. Warning and comment
messages are written to the .TXT descriptive output file.
3.5 USER SCREEN OUTPUT
As the MOBILE6 program executes, a very simple textual display is produced on the
computer screen. The program announces itself, including giving version date information, then
prompts for a batch or command input file name. Once the user enters this information, the
program displays some basic status information as it processes each scenario and run.
Of particular interest is that, following each run, a value labeled, "INERR", is shown.
This value represents the total number of errors found processing the input data for that run.
Normally, this value is zero. If a number other than zero is reported, detailed error messages will
appear in the error message file and the descriptive output file.
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CHAPTER 4
MOBILE6 INSTALLATION AND COMPUTER REQUIREMENTS
4.0 INTRODUCTION
This chapter contains technical information on how to install MOBILE6 that may be
useful in implementing MOBILE6 on various computer systems. Although this chapter tries to
make this information clear to novice computer users and veteran MOBILE model users, it
cannot and does not attempt to train users on all aspects of every computer system. The user
should be familiar with the system on which the MOBILE model is operated.
4.1 GENERAL INFORMATION
MOBILE6 is provided without restrictions: the software application, source code, and all
related files may be copied and distributed freely and may be used as a basis for other work.
However, any unauthorized modifications to the program may invalidate it for official EPA
business.
4.2 PROGRAM AVAILABILITY
MOBILE6, along with the related external data files and the User's Guide document, is
available directly from EPA via the OTAQ Web site:
http ://www. epa.gov/otaq/m6.htm
The distributed MOBILE6 executable program will only run on DOS-based PCs. All
Fortran source code and external data files are in ASCII text format. The User's Guide document
is available in WordPerfect for Windows and in Adobe Acrobat (PDF multi-platform) format.
There is no fee for these files. As stated in the above section, MOBILE6 is provided without
restrictions.
Removable media (e.g., disks or CD-ROMs) containing this information may also be
requested from EPA Regional offices or any of the other usual sources for EPA models. The
model may also be requested directly from OTAQ:
MOBILE6 Model
U.S. EPA, OTAQ, ASD
2000 Traverwood
Ann Arbor, MI 48105-2498
(734)214-4892
mobile@epa.gov
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EPA has not prepared versions of MOBILE6 that can run on platforms other than DOS-
based PCs. However, it should be possible to create executable applications for any platform, as
long as a Fortran90 compiler application is available to the user for that platform. However, EPA
cannot help users choose a compiler or run compiler software.
4.3 SYSTEM REQUIREMENTS
The executable DOS application version of MOBILE6 was compiled using the Lahey
Fortran90 Version 4.0e compiler. The source code for this version of MOBILE6 is identical to
the source code made available for other computer platforms. This is the platform that was used
to develop the initial code for MOBILE6 and is the only executable application initially intended
to be distributed.
MOBILE6 will require the minimum microcomputer hardware configuration for DOS
machines:
IBM-compatible 80386 (or better, such as 80486 or Pentium).
At least 8 megabytes of RAM memory.
Math coprocessor chip (such as Intel 80387).
Microcomputers using the 80286 microprocessor will not be able to run the MOBILE6
model. Microcomputers using 80386- or 80486-based microcomputers without a math
coprocessor also will not be able to run MOBILE6. MOBILE6 will probably not run in a DOS
window of machines using the OS/2 operating system because earlier versions of MOBILE had
this problem.
Because the scope of the MOBILE6 model has increased, the time required to run
individual scenarios has increased compared with earlier versions. It is recommended that users
consider the time it takes to execute runs of the model when selecting the appropriate machine
for running MOBILE6. Using a 400-MHz Pentium machine, typical scenarios take about six
seconds each. The time necessary to run the model using older, slower machines, may be
intolerable. EPA recommends that only Pentium (or better) machines run MOBILE6.
Some individual computers may have a problem running MOBILE6 if the DOS PATH
specification (in the AUTOEXEC.BAT file) is too long. A memory protection fault will likely
result if the DOS PATH is longer than 260 characters. Reducing the DOS PATH specification
will solve this problem.
Because some of these system requirements may be a result of the particular Fortran
compiler that was used, users with Fortran compilers may attempt to compile the source code
themselves to have greater control over the characteristics of the final executable application.
Users should refer to their compiler software documentation for further guidance.
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4.4 INSTALLATION
MOBILE6 does not include an installation application. The necessary directories must be
created by the user, and the user must copy the appropriate files to the created directories.
However, improper installation will not harm the files used by the model, although it may be
necessary to relocate files to operate the model.
4.4.1 Basic Installation
The instructions presented in this section assume that 1) the user has obtained a complete
set of MOBILE6-related files, 2) the files have been decompressed if necessary, and 3) the files
have been placed in a set of directories as explained in this section.
To obtain a complete set of MOBILE6-related files, the user should consult the EPA
OTAQ Web site at the URL listed in Section 4.2. The user may download the files from the Web
site or obtain them from a third party, but the user should always consult the Web site for all the
necessary files and for any updates in source code or documentation.
When downloaded, some of the files may be stored in a compressed, or "ZIP" format
archive file. The compressed files must first be extracted from the archive file and decompressed
before they can be used. Applications for this purpose are publically available, but obtaining and
using those applications will not be discussed here.
The MOBILE6 program and related materials are distributed in the following
DOS directory structure:
MOBILE6 (main folder)
RUN (sub-folder)
EXAMPLES (in RUN sub-folder)
UGUIDE (sub-folder)
SOURCE (sub-folder)
The simplest installation procedure is to copy this entire structure to the user's hard drive.
The instructions presented in this section assume that the user has created this directory structure
and installed all MOBILE6 files to the appropriate directory.
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4.4.1.1 The RUN SubdirectoryThe Executable Program
The most critical file necessary to run MOBILE6 is the executable application file itself
("MOBILE62.EXE"). The MOBILE6 executable application file will run from any directory on
any available drive, as long as the appropriate external data files requested by user input are
available to the application. However, for practical purposes, the user will probably want to
locate commonly used files in the same directory as the executable application file to reduce the
length of the combined file name and directory path name when specifying external data files in
the input. The limitations are:
The file, "LF90.EER", must reside in the same directory as the executable application
file. This is an error description file used by the Lahey compiler, and MOBILE6 will
automatically look for this file in the local directory if a Fortran error occurs.
MOBILE6 will run without this file being available, but some error messages will be
cryptic, making diagnostics difficult.
All data and input files must have the read-only attribute set to "off." MOBILE6 will
not read a file that has been set to read-only status. This attribute can be changed by
the user through the file properties.
Also in the RUN subdirectory is a default example command input file, "MOBILE6.IN".
The command input file does not need to reside in the same directory as the MOBILE6
application to be used. The files, "ASMDATA.D", and "TECH12.D", are also required to model
the effect of I/M programs. Additional files are required to use the added capabilities of
MOBILE6.1 and 6.2.
It is recommended that users install more than just the MOBILE6 application. In
particular, it is recommended that users have the complete set of example inputs available for
reference and for use as templates to create more complex command input files. Also, users will
want a complete set of alternate external input files to use as templates for creating data inputs
using local information. A set of alternate external data input files are provided with MOBILE6.
These alternate example files are useful as templates for construction of external data files that
contain local data. The example input files are set up assuming that the external data files are
available in the same directory as the MOBILE6 application. As a result, these example external
data files should all be placed in the directory containing the MOBILE6 executable application
file. These files will not interfere with any other input files and will take effect only if invoked
within a command input file. It is recommended that the user not change these files. If they are
used as templates, a copy should be made with a different file name, and changes should be made
to the copy. However, because they are invoked by the command input files, they must not be set
at read-only status, or MOBILE6 will not read them.
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4.4.1.2 The Examples Subdirectory
An additional subdirectory (i.e., EXAMPLES) should be created to contain example
command input files. All of the example command input files provided should be placed in this
directory for reference. It is recommended that these files be read-only and not be changed. If
they are used as templates, a copy should be made with a different file name, and changes should
be made only to the copy.
4.4.1.3 The UGUIDE Subdirectory
The MOBILE6 User's Guide is available electronically. Although it may be convenient to
have a printed copy, it is recommended that the user keep a copy of the electronic version of the
User's Guide with the copy of MOBILE6. An additional subdirectory (e.g., UGUIDE) containing
the MOBILE6 User's Guide files is recommended. There are two files:
UGMOB62.WPD
User's Guide for MOBILE6.2. Covers all earlier versions. WordPerfect format.
UGMOB62.PDF
User's Guide for MOBILE6.2. Covers all earlier versions. Adobe Acrobat format.
Additional documentation such as "frequently asked questions" may be included in this
subdirectory.
4.4.1.4 The SOURCE Subdirectory
EPA will make the Fortran source code available for the MOBILE6 application. This
source code is provided so the user can recompile the application for different platforms and
optimize the application for specific operating systems. However, unauthorized modifications to
the program source code might nullify its usefulness for official EPA business. EPA cannot assist
users in their choice of a compiler or with running compiler software. In most instances, users
will not need to keep a copy of the MOBILE6 source code. It is not needed to run the application
or understand how to run the model. However, if the user wishes to keep a local copy of the
source code, it is recommended that a separate subdirectory (SOURCE) be created to keep the
source code files.
4.4.2 Advanced Options
Users may want to share command input files and external data files to avoid duplication
and confusion. This is possible by locating these files on a network (shared) drive. Because
MOBILE6 allows file names to include drive and directory path information, users can share
these files as long as they are properly identified in the command input file and specified in the
keyboard entry of the file name. Some systems, however, specify shared drive locations
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differently for different users on the network. All users should share the same location
designation and have simple access.
The MOBILE6 executable application file itself can be located on a shared drive.
However, running MOBILE6 through a network will further slow the execution time. Because
the MOBILE6 application file itself is not large and can be copied without restriction, it may
make more sense to provide each user with their own copy on their local hard drive. The
application itself does not change and does not need to be shared.
MOBILE6 cannot read directory names that are more than eight characters or contain
characters that cannot be read by DOS. Some operating systems allow longer names and non-
standard characters. Do not take advantage of these features.
4.5 RUNNING MOBILE6
MOBILE6 cannot run in a full interactive mode. The user must provide a text file (i.e., a
command input file) containing control information (i.e., commands, data) that MOBILE6 uses
to determine what sort of output to produce. If such a file does not exist, MOBILE6 will not run.
The user should read Chapter 2 to learn more about how to create an appropriate command input
file. MOBILE6 is also distributed with many example command and external input data files.
Users may want to use these example files to test or practice using MOBILE6. The command and
external input files must exist on a drive available to the user and must not be compressed or set
to read-only status.
4.5.1 Basic Run
To execute the application in DOS mode, the user must invoke the application name at
the DOS prompt by typing the name MOBILE6 and pressing the "enter" or "return" key. The
program will return with a prompt:
"Enter the name of the Mobile6 input file:"
The file name the user enters will determine the source of input information used by MOBILE6.
The user must enter the location of the input information and press the "enter" or "return" key.
The program will prompt the user in the same way on all computer platforms. If the user enters
an invalid or nonexistent file name, MOBILE6 will prompt the user for a valid file name. If the
user leaves the entry blank and presses the "enter" or "return" key, MOBILE6 will quit. Valid file
names are discussed in Section 4.5.5.
When using a version of Microsoft Windows, double clicking on the MOBILE6
application icon will start a DOS window that will include the DOS prompt described above. The
user will then enter the input information the same way as if running MOBILE6 from DOS.
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MOBILE6 makes use of the ability of DOS-based machines to access information that
does not reside in the local directory. As a result, any time the MOBILE model asks for a file
name, the user may also supply a DOS path with the file name. This will allow input and output
file information to reside in directories other than the one in which MOBILE6 resides.
For example, the user has a command input file, "TEST.IN", on their hard drive at the
location:
c:\mobile6\run\test.in
When MOBILE6 is invoked, the prompt will ask for the location of the command input
file. The user should enter the full drive, path, and file name. It will not matter where the
MOBILE6 application is located or where the command input file is located, as long as the full
drive, path, and file name is entered when prompted.
Windows users can place "shortcuts" to the MOBILE6 application in convenient
locations (e.g., the desktop) to make it easier to invoke the MOBILE6 application. The name of
the directory that contains the MOBILE6 executable file can be added to the PATH statement in
the "AUTOEXEC.BAT" file, which will allow MOBILE6 to be invoked from any directory
when in DOS mode.
If the command input file is in a subdirectory of the directory that contains the actual
MOBILE6 application (not a shortcut to the MOBILE6 application), then the full path name does
not need to be used. This can reduce the amount of required typing to enter the file name. For
example, if the MOBILE6 application is in the directory, "c:\mobile6" (as in the example on page
130), then the file name can be entered (at the prompt) as:
run/test.in
MOBILE6 will search for a subdirectory of that name and locate the file there. The drive
designation and the primary directory location are not needed. A slash (/) character may be
substituted for the normal backslash (\) character for this purpose.
MOBILE6 will automatically label the output file names and choose file name extensions
for the output files by default. For more information, see Section 4.5.3. This means that if the
user does not specify the output file names and locations, all output will automatically be located
in the same directory as the command input file. The output file names will also be the same as
the command input file name, but with the different file name extensions. This feature allows
users to run MOBILE6 without designating output file names. However, users can designate
output file names and locations, which is discussed in Section 4.5.5.
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Another feature allows even less typing. MOBILE6 expects that all command input files
have a file name extension of ".IN". For example, the above command input file prompt can
further be shortened to:
run/test
In this case, all output will be written to the "c:\mobile6\run" directory, and all output
files will have TEST file names with different file name extensions (depending on the type of
output).
4.5.2 Input
Any word processing software or text editor can create or modify the example MOBILE6
command and external input files to match user requirements. Editing an example command or
external input file with careful reading of the relevant sections of Chapter 2 is the easiest way to
ensure that the proper commands, locations, and formats are maintained. However, when using
word processing software, the user should always save input files only as DOS text documents
(ASCII text). MOBILE6 expects all input files to be in text. Converting and saving MOBILE6
input files as word processing documents will add hidden characters, which will not be properly
processed by MOBILE6. Command and external input files that have been inadvertently
converted to a word processing document can be recovered by saving the file again as a DOS text
file. Simple text editors (such as Notepad) will not normally add unwanted characters to a file.
Do not add hidden characters (such as tabs) to MOBILE6 input files because MOBILE6 cannot
read them properly.
The user can determine if an input file has hidden characters by using the TYPE
command available in DOS to list the input file to the screen. Any characters shown that were
not intended to be in the file will likely cause problems when the file is read by MOBILE6. An
example of the TYPE command, with an option to pause after each screen of characters would
be:
TYPE | MORE
Most word processors and editors also have features that allow the user to see hidden
characters. These features can also be used to identify and remove hidden characters.
When altering or creating MOBILE6 command or external input files, the user should
know the rules for annotating the input and output text (described in Sections 2.6.3 and 2.7).
MOBILE6 allows liberal inclusion of descriptive text in command and external input files and
allows text to be added to the output via the command input file. EPA encourages users to take
advantage of this feature.
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4.5.3 Output
All results from MOBILE6 are written to ASCII text files. There are three basic output
types: descriptive, spreadsheet, and database. Descriptive output is appropriate to be printed and
includes sufficient labeling and notation so it can be interpreted without extensive knowledge of
MOBILE6. Spreadsheet output contains essentially the same level of information in a form easily
loaded into spreadsheet software. The database output is intended to be processed using
applications such as database software or (with care) spreadsheets. Interpretation of the database
output will require advanced understanding of MOBILE6. All output options are described in
more detail in Chapter 3.
By default, MOBILE6 uses six file name extensions, ".TXT", ".PM", ".TOX", ".TAB",
".TB1", and ".ERR". These are listed and explained in section 4.5.5. The user has the option to
specify the file name of both descriptive output files and the database output file. This feature is
discussed in Section 4.5.5. EPA recommends that, like the example, the base of the output file
names be the same as the base of the command input file name to avoid confusion when
matching MOBILE6 results with the corresponding command input file. By default, output files
are written to the same directory location as the command input file. This location can be altered
by providing the output file name and indicating a different path for output file names.
The descriptive output file(s) can be printed once these have been opened by an
application such as a word processor. For best results, EPA recommends using non-proportional
fonts (such as Courier font) because the output file design contains no formatting characters
(such as tabs). Because the output is 120 characters wide, EPA recommends printing the pages in
"landscape" format (11" by 8-1/2"), reducing the font size to 10 points, and setting both the left
and right margins to 0.5 inches. In this case, the full width of the descriptive output should fit on
a standard page. Because the length of the output is determined by a great variety of parameters,
it is likely that the text of the output will run over several pages. EPA recommends that the user
add automatic page numbering to the output document via options available in the application
used for printing. A run and scenario number will be indicated in the text within the output itself.
The database output file is not intended to be printed. Unless the user specifies the WITH
FIELDNAMES command in the Header section of the command input file (see Section
2.8.5.1.b), the database output will be an ASCII text file containing thousands of numbers and no
text. EPA recommends that applications designed to process numbers be used to access this
information, such as database, spreadsheet, or statistical applications. A detailed description of
the content of the database output is found in Chapter 3.
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4.5.4 Batch Input
Batch input is used to refer to the ability to run several command input files together with
a single invocation of MOBILE6. Each command input file can contain several runs with
multiple scenarios, and each scenario produces a separate result. In this way, many results can be
obtained by either multiple runs in a command input file or by running multiple command input
files using the batch option. Setting up a batch input file is described in Section 2.8.2.2.
Running a batch input file is done exactly the same as any input file. The first line of any
MOBILE6 input file must contain the command that describes the type of in the file. A batch
input file announces itself to the MOBILE6 program using the MOBILE6 BATCH FILE
command. MOBILE6 will then process the input and output file names that it contains. For
example, if the user created a batch input file with the name, "TESTBAT.IN", at the file name
prompt, the user could type:
run/testbat
This assumes that the "TESTBAT.IN" file is located in a subdirectory named RUN and
that the MOBILE6 application is located in the directory that has the subdirectory RUN. None of
the files (input or output) that are listed in the "TESTBAT.IN" file need to be in either directory
as long as the path is included with each file name.
4.5.5 Input and Output File Names
Mobile6 input and output file names cannot contain more than eight characters, followed
by a decimal and an optional three-character extension. The names must contain only valid DOS
file name characters. If a batch or command input file name is not provided, MOBILE6 will
assume that the input file name is MOBILE6.IN. The content of input files is discussed in
Chapter 2.
MOBILE6 displays the names of both the command input file and the descriptive output
file for HC, CO, and NOx on the monitor screen before it processes the command input file.
When processing a batch input file, the names of each of the command input files and the
descriptive output files are displayed on the monitor screen before MOBILE6 begins to process
each command input file. Database output file names are not displayed on the monitor screen.
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The user may specify a name for any MOBILE6 output file or elect to have MOBILE6
assign a default name. By default, all output file names will use the same initial eight characters
used in the input file name supplied by the user to name output files, but MOBILE6 will add
extensions that indicate the type of output contained in each file.
The extension, ".TXT", is used for descriptive output files for HC, CO, and NOx.
The extension, ".PM", is used for descriptive output files for PM and related pollutants.
The extension, ".TOX", is used for descriptive output files for air toxic pollutants.
The extension, ".TAB", is used for spreadsheet output files.
The extension, ".TB1", is used for database output files.
The extension, ".ERR", is used for fatal error reports.
The content of output files is discussed in Chapter 3. Although the user can change the
output file name, to avoid confusion, it is recommended that the names of all output files be the
same (except for the three-character extensions) as the names of the command input files that
were used to generate the results. This will make it easier to associate the resulting data with the
appropriate command input file. This is the default case. However, there may be cases in which
the user wishes the name and/or location of the output files to be different than that of the
command input file that created them.
±
There are three ways to specify the output file names:
Using the REPORT FILE and EMISSIONS TABLE commands.
Adding the output file name after the input file name in batch input files.
Adding the output file name after the input file name when running MOBILE6.
By default, if an output file name is not specified, the output file will be written to the
same directory as the location of the command input file (as indicated in the path portion of the
file name). If the user specifies an output file name but does not include a pathbut the input file
names have a paththe output files will not be written to the same directory as the command
input file. Instead, the output files will be written to the same directory as the MOBILE6
program. If the user wishes to have the output written to another directory, the path to the
directory must be specified in the output file name. MOBILE6 will treat slashes (/) and
backslashes (\) interchangeably in the path names.
The optional REPORT FILE command (see Section 2.8.4.1) can be used to name the
descriptive output file(s), and the optional EMISSIONS TABLE command (See Section 2.8.5.2)
can be use to name the database output file from within the command input file. The effect of
both of these commands will be overridden if either of the other two options for naming output
files is used.
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Output file names can also be specified from within a batch input file. This is done by
entering the desired output file name(s) following any corresponding command input file name.
The user must leave at least one blank space between the input and output file names.
The output file name specified in a batch input file will take precedence over both the file
name specified using the REPORT FILE command and the file name specified using the
EMISSIONS TABLE command within the MOBILE6 input file named. Both the descriptive and
database output file names will always use the default extensions for output files, regardless of
the extension of the file name provided by the user after the file name prompt. As a result, only
the eight-character name may be specified for the MOBILE6 output files in this manner. For
example:
MOBILE6 BATCH INPUT
c:\town\input
c:\village\data.inp c:\results\output.dat
run 12
test/m6in m6out
The results from the first command input file ("INPUT.IN", located in the "c:\town"
directory) will be written to the "INPUT.TXT" file (and "INPUT.TB1"), located in the "c:\town"
directory. The results from the second command input file (file "DATA.INP", located in the
"c:\village" directory) will be written to the file, "OUTPUT.TXT" (and "OUTPUT.TB1"),
located in the "c:\results" directory. Although the ".DAT" extension is used on the output file
name, the extension is ignored by MOBILE6, and the default extensions (".TXT" and ".TB1")
are used instead. The third command input file, "RUN 12.IN", must be located in the same
directory as the MOBILE6 application because the user did not specify a path. The results will be
written to the same directory and will have the default names, "RUN12.TXT", and
"RUN12.TB1". The last example indicates that the command input file, "M6IN.IN", must be
located in the "\test" subdirectory of the directory in which the MOBILE6 program is located.
The results will be written to the same directory as the MOBILE6 application and will have the
default names, "M6OUT.TXT", and "M6OUT.TB1".
Alternatively, if a batch input file is not being used, the user can simply enter the desired
output file name (with or without DOS path) following the user-supplied input file name when
entering the command input file name in response to the initial "Enter the name of the MOBILE6
input file:" prompt. The user must leave at least one blank space between the input and output
file names and may specify an output file name only if the command input file name has already
been specified (i.e., not blank).
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Both the descriptive and database output file names will use the default extensions for
output files, regardless of the extension of the output file name provided by the user after the file
name prompt. For example:
Enter the name of the MOBILE6 input file:
c:\city\data
Enter the name of the MOBILE6 input file:
c:\city\input.in c:\results\output
Enter the name of the MOBILE6 input file:
test/m6in m6out
The first example indicates that the input file ("DATA.IN") is located in the "c:\city"
directory. The descriptive output files will be written to the "c:\city" directory and will be
named, "DATA.TXT", "DATA.PM", "DATA.TOX", and "DATA.TB1", if database output is
specified. The second example indicates that the command input file ("INPUT.IN") is located in
the "c:\city" directory. The descriptive output files will be written to the "c:\results" directory
and will be named, "OUTPUT.TXT", "OUTPUT.PM", "OUTPUT.TOX", and "OUTPUT.TB1",
if database output is specified. The last example indicates that the command input file
("M6IN.IN") must be located in the "\test" subdirectory off the directory in which the MOBILE6
application is located. The results will be written to the same directory as the MOBILE6
application and will have the default names, "M6OUT.TXT", "M6OUT.PM", "M6OUT.TOX",
and"M6OUT.TBl".
4.5.6 Open Actions
The user may optionally specify open actions for output files. These actions dictate
whether MOBILE6 creates a new output file or inserts modeling results into an existing output
file. The legal open action options are APPEND and REPLACE. Both options create a new file if
the specified output file name does not already exist. If the output file does already exist:
The APPEND action adds new output to the end of the output file. Thus, results from
previous MOBILE6 runs using the same output file name are retained.
The REPLACE action deletes existing text in the output file so that only new
modeling results are retained. REPLACE is the default open action.
To avoid confusion, it is recommended that the APPEND action be used only in special
circumstances. This will ensure that the output files contain the results only from the most recent
running of the associated command input file. These options may be entered in mixed case. If no
open action is specified, the action will default to REPLACE.
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To specify the open action, the user must enter both the command input file name and the
output file name. The open action is entered on the same line, following the output file name.
The open action must be separated from the output file name by at least one blank space and may
be specified in mixed case.
4.6 MOBILE6 SOURCE CODE
The MOBILE6 model as released was written in standard Fortran90 computer language,
using the ANSI X3.198-1992 standard published by the American National Standards Institute.
The source code is distributed in ASCII text files. Most subroutines and functions have
been separated into separate text files, although some files may contain more than one function
or subroutine. All subroutine and function files have the file name extension A*.FOR@. Files
that have the extension "*J" are "include" files, which contain information used in common
blocks. MOBILE6 was compiled using an option (MAKE), which allowed the various
subroutines to be compiled separately and "linked" at the end to make the executable application.
The various function and subroutine files may be combined, if the user wishes, to reduce the
number of files that must be compiled without affecting the results from the program.
The same source code (including all comment records) should be used for any installation
of the model on any computer platform, with the exception of necessary changes in the
input/output (I/O) device allocations for different platforms. The variable name used to represent
each device assignment in the program code is listed below:
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Default
Description Variable Name Device Number
Control file input (IOUGEN) 1
I/M parameters input (IOUXEVI) 3
I/M credit input (IOUIMD) 4
Keyboard input (IOUIN) 5
External data file input (IOUALT) 7
Batch control file input (IOBAT) 19
Program descriptive output (HC, CO, NOx) (IOUREP) 2
Program descriptive output (IOUPM) 8
(PM and related pollutants)
Program descriptive output (IOUAT) 9
(Hazardous air pollutants (HAPs)
Program spreadsheet output (IOUSS) 10
Error message output to file (IOUERR) 2
Monitor screen output (IOUOUT) 6
Program database output (DBUNIT) 51
Unneeded output (IOUNULL) - 1
The default setting for these devices are optimized for the DOS platform. The device
assignment variables are initialized in Block Data Subprogram 16. The device assignment
variables are also reset in the "driver" program when the application is invoked. If a user wishes
to change the default settings, the settings should be changed at both locations. In earlier
MOBILE versions, the system of using variable names for device assignments was not fully
implemented. Every attempt has been made in MOBILE6 to use only the variable names above,
with all initialization in the two locations listed. In general, it is prudent for users not to attempt
to change the device settings unless it is absolutely necessary.
4.7 USING MOBILE6 ON OTHER COMPUTER PLATFORMS
If properly compiled and built, MOBILE6 will run the same way on all computer
platforms and have all of the same options and capabilities. As a result, the same User's Guide
may be used for all platforms. There are some minor considerations that are platform-specific
and are discussed in the remainder of this section.
In this section, "computer platform" means a specific combination of computer hardware
version, operating system version, and Fortran compiler version.
An executable application of MOBILE6 is provided for only one platform, requiring
typical Intel APC@ hardware and DOS operating system compatibility (section 4.3). Because the
source code for all computer platforms is identical, a source code file available on one platform
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(such as DOS-based microcomputers) may be used on another platform (such as a mainframe
computer or Unix system) as long as any appropriate changes for that platform are made to the
device allocations. This will require the user to have access to a Fortran90 compiler capable of
handling the MOBILE6 source code in order to re-create the executable application from the
(altered) source code.
EPA cannot assist users in their choice of a compiler or with running compiler software.
EPA will not be able to assist users with problems resulting from conflicts with the platform
operating system.
The following are some considerations that might help for users who intend to create
MOBILE6 executable applications for their own platforms.
4.7.1 Platform-Specific Differences
Users can generally expect to see MOBILE6 perform differently in two areas when used
on different computer platforms. First, small differences in the model results will exist, and the
second is a difference in the file names and paths that will be accepted.
There sometimes will be a negligible difference in the model results (the emission factors
calculated by MOBILE6) when comparing results from different computer platforms. This can be
the case even when the model is run on the same hardware using different compiler versions.
This discrepancy is likely due to the number of significant digits that the computer system carries
when doing calculations. The differences are usually small (less than one half of one percent),
but they sometimes will show up in larger numbers in the last digit of MOBILE6 output. As a
result, for the sake of consistency, comparison or mixing of results from MOBILE6 runs
executed on different computer platforms is not recommended.
Although the MOBILE6 code accepts file names and pathway information up to 80
characters in length, some Fortran compilers are more restrictive, and some operating systems
may allow file names and paths much longer than 80 characters. It is also important to note that
some operating systems (e.g., Unix) use file names that are case-sensitive, while others interpret
upper-case and lower-case letters as the same.
4.7.2 DOS Platform Differences
On systems with Intel hardware and the DOS operating system, the Fortran compilers
available to EPA for development of the release version of MOBILE6 are not the only ones
available. However, there are limits to the amount of exploration into compiler differences that
can be done by EPA. It may be possible to recompile MOBILE6 source code using a different
compiler to avoid limitations in the distributed version of MOBILE6. However, EPA cannot
assist users in their choice of a compiler or with running compiler software.
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4.7.3 Apple Macintosh Microcomputers
Macintosh operating systems use different default device assignments than DOS-based
machines. This will likely require changes to the default device assignments in MOBILE6. In
particular, the assignment of the keyboard input may be different. Below is the correct
assignment for the keyboard input variable:
Keyboard input (IOUIN) Device 9
This in turn means that IOUAT needs to be reassigned.
The location of files in the Macintosh operating system works differently than in DOS.
As a result, it is recommended that all input and external data files be placed in the same folder
as the MOBILE6 application. This way, only the file name (and not the path) is needed for the
command input file prompt.
To execute the application, double click on the MOBILE6 icon or choose FILE OPEN
from the system menu. A window will appear with the MOBILE6 standard prompts. The
program will prompt the user in the same way on all computer platforms.
4.7.4 Mainframe, Unix, and Other Computers
As explained at the beginning of this section, the same source code (including all
comment records) should be used for any installation of the model on any platform, with the
exception of necessary changes in the input/output (I/O) device allocations for different
platforms. It will be necessary for the MOBILE6 source code and other files to be uploaded to
the target computer system from the Web site or other source.
The default device assignments for MOBILE6 will likely cause problems on some Unix
computers. Although the Office of Transportation and Air Quality (OTAQ) has not run
MOBILE6 on other computer platforms, the following comments have been received from users
with Sun systems using the Unix operating system with earlier versions of MOBILE. The
modifications discussed in this section are known to be useful only for Sun systems; other
systems may require different device assignments.
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Standard device assignments for the Sun machines are "5" for input, "6" for output, and
"0" for error messages. This suggests that the following device assignments be made in the main
program:
Keyboard input (IOUIN) Device 5
Control file input (IOUGEN) Device 11
Error message output to file (IOUERR) Device 0
Program descriptive output (IOUREP) Device 6
(HC, CO, NOx)
It is important to remember that other device assignments are used for data file input and
program output. The complete list of device numbers in Section 4.6 should be examined for
conflicts.
It is also important to remember that Unix operating systems are case-sensitive, so
external data file names entered as part of the input must match the case of the actual file names.
MOBILE6 converts all user supplied file names to all upper case for processing. This means that
all external file names (and the paths leading to them, if used) on Unix based platforms must be
in all upper case to be used by MOBILE6.
The changes mentioned above have not been tested by OTAQ. Other computer systems
may require different device assignments than those given above for Sun systems. However, any
changes in the device assignments will not affect the validity of the results of the model.
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CHAPTER 5
CONVERTING MOBILES INPUTS TO MOBILE6
5.0 INTRODUCTION
This chapter discusses how to use an existing MOBILES input file to create a
corresponding MOBILE6 input command file. Users should familiarize themselves thoroughly
with how MOBILE6 input commands are used before they attempt to use this chapter.
As explained in Chapter 2, MOBILE6 uses input commands to replace the control flags
used in MOBILES. The chapter discusses how to convert each MOBILES input file entry into the
equivalent MOBILE6 command entry.
5.1 BASIC CONVERSION
The table in Appendix C lists every MOBILES input parameter and identifies the
corresponding command that serves the same function in MOBLE6. Most MOBILES features
can be used directly, without additional calculations, once the corresponding MOBILE6
command has been identified. For example, the PRTFLG in MOBILES has been replaced by the
POLLUTANTS command in MOBILE6. Several other MOBILES input parameters, such as the
PROMPT or the LOCFLG flag, are no longer needed because they were used in MOBILES to
control the format of the input file. Several other MOBILES features, identified in the table in
Appendix C and discussed below, have been eliminated from MOBILE6.
On the other hand, there are several MOBILES features that required user-supplied
values, which often require more extensive effort with MOBILE6. For example, the user-
supplied vehicle miles traveled (VMT) by vehicle class (using VMFLAG) in MOBILES now
requires fractions for 16 combined vehicle classes in MOBILE6 (using the VMT FRACTIONS
command) instead of the eight necessary for MOBILES input. The conversion of these features is
discussed in Section 5.3.
In general, because MOBILE6 has expanded capabilities, directly converting MOBILES
input to MOBILE6 input will underutilize MOBILE6. Further guidance is expected to be
provided to utilize more of the features of MOBILE6 once users become familiar with it. Users
should be cautious in experimenting with these new capabilities for official emission estimates
until EPA provides official guidance. Once proper guidance is available, it may supercede these
rough conversion methods. Until then, users should continue to use existing guidance to
determine which features to use and how to select or calculate the required input values.
Once users have become familiar with MOBILE6 input structure, users should refer to the
table in Appendix C to identify which MOBILES inputs require conversion. For features that
translate easily, the user will be directed to the appropriate MOBILE6 command described in
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detail in Chapter 2. For features that are more difficult to translate, Appendix C will direct the
user back to this section to supply additional information.
5.2 FEATURES NO LONGER AVAILABLE
Features that are no longer available in MOBILE6 cannot be modeled and should be
dropped when converting MOBILES inputs to MOBILE6:
Idle Emission Rates (TDLFLG^
This feature allowed the user to get additional values in the descriptive output for the HC,
CO, and NOx emission rates of vehicles idling in grams per hour. This feature was not
included in MOBILE6, although gram per hour results are available in the database
output.
Input and Output Devices (IQUNEW^)
This feature allowed the user to specify the Fortran device designation value used for
output. In particular, this feature allowed the user to write error messages to a separate
output file. This feature did not always work properly in MOBILES and was not
considered useful for the release of MOBILE6.
Alternate Tampering Rates (TAMFLG)
With the introduction of the phase 2 of the onboard diagnostic (OBD) electronics in 1996,
the explicit modeling of the effects of tampering on vehicle emissions will phase out
because OBD vehicles are assumed to have negligible tampering rates. Providing for
user-supplied tampering rates for pre-1996 model year vehicles was not considered
necessary for the release of MOBILE6.
User Entry of Basic Exhaust Emission Rates (NEWFLG)
Because it had no legitimate use in normal calculations, this feature was not included in
the plan for official MOBILE6 release.
Override User-Specified I/M for Tier 1 Vehicles OMFLAG^)
Because this feature was considered a diagnostic capability with no legitimate use in
normal calculations, it was not included in the plan for MOBILE6 release.
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Functional Purge Check Inspection Programs (ATPFLG)
Because no acceptable inspection procedure was developed, this feature has been dropped
from MOBILE6.
Remote Sensing Device Inspection Programs
This flag (located on the I/M Control Flag Record) was used in MOBILESb to ensure that
the alternate I/M credits used had been adjusted to reflect the effects of a remote sensing
device inspection program. MOBILE6 no longer allows the entry of alternate I/M credits.
Therefore, the ability to model remote sensing device inspection programs was not
considered necessary for the release of MOBILE6. It may be considered in future
releases.
Effectiveness for Anti-Tampering Programs
This feature was not considered necessary for MOBILE6.
Effectiveness for Functional Pressure and Purge Check Programs
This feature was not considered necessary for MOBILE6.
Extra Load and Trailer Towing Fractions (ALHFLG)
EPA guidance has long suggested that these features not be used, so they have been
removed from MOBILE6.
5.3 CONVERTING USER-SUPPLIED DATA
Certain user-supplied data available from a MOBILES input file will not be directly
usable in MOBILE6 without guidance. These are:
Data provided daily.
Data provided by vehicle class.
User-supplied operating modes.
Average speed.
Specific roadway (facility) type modeling.
In these cases, data available from a MOBILES input file will need to be converted in
order to be used in MOBILE6. If default MOBILES values were used. MOBILE6 input and
conversions are not required.
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5.3.1 Hour of the Day
MOBILE6 allows the user to enter many activity parameters individually for each hour of
the day. MOBILES allowed for only a single activity entry. Until further guidance is available,
the same (single) MOBILES entry should be used for each of the 24 hours in MOBILE6.
One example is trip length distributions. MOBILES allowed the user to enter a single trip
length distribution, but MOBILE6 allows the user to enter 14 trip length distributions for separate
hourly groupings. For MOBILE6 input, the same MOBILES trip length distribution would be
entered for each of the 14 hourly groups using either the WE DA TRILEN or WE EN TRILEN
commands.
5.3.2 Vehicle Class
MOBILES accounted for only eight vehicle classes, but MOBILE6 has greatly expanded
the number of individual vehicle classes to 28. In some contexts, MOBILE6 input is provided in
terms of 16 combined vehicle classes. In some cases, aggregated user-supplied MOBILES data
will be used for each of the vehicle classes in MOBILE6. In other cases, such as distributions, the
MOBILES values must be split by vehicle class for use in MOBILE6.
VMT Distribution by Vehicle Class
Because of the unequal growth that occurs in various vehicle classes, the VMT
distribution by vehicle class becomes a function of calendar year. MOBILES allowed the user to
enter eight VMT values, corresponding to the eight vehicle classes represented in the MOBILES
output. MOBILE6 allows the user to enter 16 VMT values by combined vehicle class.
Whereas MOBILES allowed the user to enter separate VMT for diesel- and gasoline-
fueled vehicle classes, MOBILE6 requires that VMT by vehicle class be supplied in terms of the
16 combined gasoline and diesel-fuel categories. In MOBILE6, the VMT by vehicle class is split
internallyaccounting for the diesel sales fractions and annual mileage accumulation ratesin
order to ensure that all of the fleet description and activity values are consistent with one another.
The first step in converting MOBILES to MOBILE6 VMT fractions is to combine the VMT
fractions for gasoline and diesel categories into five composite gasoline/diesel groupings:
LDV Group = LDGV + LDDV
LOT Group 1 = LDGT1 + LDDT
LOT Group 2 = LDGT2
HDV Group = HDGV + HDDV
MC Group = MC
The sum of the VMT fractions from the five groups should still equal 1. These fractions
are then adjusted using factors calculated from the default distributions of VMT from MOBILE6
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for the appropriate calendar year. These adjustment factors are provided in Appendix D. When
the adjustments are completed properly, the sum of the 16 MOBILE6 VMT fractions will be 1.
16 Combined MOBILE6 Vehicle Classes
LDV
LDT1
LDT2
LDT3
LDT4
HDV2b
HDV3
HDV4
HDV5
HDV6
HDV7
HDVSa
HDVSb
HDBS
HDBT
MC
VMT Fraction Calculation
LDV Group
LOT Group 1 * A
LOT Group 1 * B
LOT Group 2 * C
LOT Group 2 * D
HDV Group * E
HDV Group * F
HDV Group * G
HDV Group * H
HDV Group * I
HDV Group * J
HDV Group * K
HDV Group * L
HDV Group * M
HDV Group * N
MC Group
The values A through N are taken for the appropriate calendar year from the table in
Appendix D. They are calculated from the default MOBILE6 VMT fractions for that calendar
year. The terms A and B, C and D, and E through N should each add up to 1. The resulting 16
VMT fractions are supplied to MOBILE6 using the VMT FRACTIONS command.
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Registration Distribution
As with VMT fractions, MOBILE6 allows the entry of registration distributions for 16
vehicle classes, which combine the gasoline and diesel categories using the REG DIST
command. MOBILES allowed the user to enter eight sets of registration distribution values,
corresponding to the eight vehicle classes represented in the MOBILES output. In MOBILES, the
registration distributions for LDGV and LDDV and the registration distributions for LDGT1 and
LDDT had to be identical.
MOBILES allowed the user to enter registration distributions separately for diesel- and
gasoline-fueled heavy-duty vehicle classes. MOBILE6 requires that all entries of registration
distributions by vehicle class be in terms of the combined gasoline- and diesel-fuel categories. In
MOBILE6, the registration distributions are split internallyaccounting for the diesel sales
fractions and annual mileage accumulation ratesin order to ensure that all of the fleet
description and activity values are consistent with one another.
The first step in converting MOBILES registration distributions to MOBILE6 registration
distribution fractions is to combine the registration distributions for gasoline and diesel heavy-
duty categories, creating five groups:
LDV Group = LDGV or LDDV (they should be the same in MOBILES)
LOT Group 1 = LDGT1 or LDDT (they should be the same in MOBILES)
LOT Group 2 = LDGT2
HDV Group = weighted HDGV + HDDV (see below)
MC Group = MC
The HDGV and HDDV registration distributions need to be combined using the fraction
of all heavy-duty vehicles in each category. The values (O and P) shown in the table in Appendix
D are the gasoline and diesel heavy-duty vehicle fractions for each calendar year. The sum of the
O and P value must be 1 for each calendar year. These weighting factors are derived using the
MOBILE6 default distributions and vehicle counts.
Each HDGV registration fraction is multiplied by the value O, and each HDDV
registration fraction is multiplied by the value P. The registration fractions for each age (HDGV
and HDDV) are then added together to give the combined registration fraction for that age for the
HDV group. The sum of all fractions in the HDV group must be 1.
Once all the group registration distributions have been determined, the grouped
registration distributions are repeated for the appropriate MOBILE6 vehicle classes, with the
exception of the MOBILE6 heavy-duty transit bus vehicle category. Because transit buses are
assumed to be all diesel-fueled, the MOBILES HDDV registration distribution can be used
directly.
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Sixteen Combined MOBILE6 Vehicle
Classes
LDV
LDT1
LDT2
LDT3
LDT4
HDV2b
HDV3
HDV4
HDV5
HDV6
HDV7
HDVSa
HDVSb
HDBS
HDBT
MC
Registration Distribution Used
LDV Group
LDT Group 1
LDT Group 1
LDT Group 2
LDT Group 2
HDV Group
HDV Group
HDV Group
HDV Group
HDV Group
HDV Group
HDV Group
HDV Group
HDV Group
MOBILES HDDV
MC Group
The resulting 16 registration distributions are supplied to MOBILE6 using the REG DIST
command.
Diesel Sales Fractions
MOBILE6 uses diesel sales fractions by model year and vehicle type to distribute the
overall vehicle counts by combined vehicle class into those that are gasoline-fueled and those
that are diesel-fueled. These values are entered into MOBILE6 using the DIESEL FRACTIONS
command. MOBILES also used diesel sales fractions, but only for light-duty passenger vehicles
and light-duty trucks.
MOBILES diesel sales fractions don't need to be converted. However, the values must be
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placed in the correct order for MOBILE6 as described for the DIESEL FRACTIONS command.
The MOBILES order is 25 pairs of values, with each pair containing one passenger car (LDV)
value followed by one light-truck (LDT1) value. The MOBILE6 command requires that the
diesel sales fractions for all 14 combined vehicle classes be provided. The MOBILES value for
the LDV vehicle class can be used directly, and the MOBILES value for the LDT1 class can be
used for the LDT1 and LDT2 classes in MOBILE6.
The simplest approach is to fill in the remaining 11 vehicle classes with the default values
from MOBILE6. However, the default diesel sales fractions in the MOBILE6 code are stored by
model year, and the values read from the input file must be arranged by age, based on the
scenario calendar year.
The table in Appendix E shows the default MOBILE6 diesel sales fractions by model
year. In copying these values to a command input file, the user must begin with the scenario
calendar year and select values for 25 vehicle ages. If the calendar year is not 1996, the diesel
sales fractions will be repeated for some older or newer model years. The values in Appendix E
are identical to the values in example file, "DIESFRAC.DEF", which is provided as part of the
distribution of the MOBILE6 program.
Mileage Accumulation Rates
Annual mileage accumulation rates were entered for each of the eight vehicle classes in
MOBILES. MOBILE6 allows the entry of annual mileage accumulation rates for any of the 28
individual vehicle classes using the MILE ACCUM RATE command. No conversion of the
MOBILES annual mileage accumulation rates is necessary. It is necessary to apply only the
appropriate MOBILES annual mileage accumulation rate to the corresponding vehicle classes in
MOBILE6.
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MOBILE6 Individual Vehicle Class
LDGV
LDGT1, LDGT2
LDGT3, LDGT4
HDGV2b, HDGV3, HDGV4, HDGV5,
HDGV6, HDGV7, HDGVSa, HDGVSb,
HDGB
LDDV
LDDT12, LDDT34
HDDV2b, HDDV3, HDDV4, HDDV5,
HDDV6, HDDV7, HDDVSa, HDDVSb,
HDDBS, HDDBT
MC
Appropriate MOBILES Annual Mileage
Accumulation Rate
LDGV
LDGT1
LDGT2
HDGV
LDDV
LDDT
HDDV
MC
Table 3 of Appendix B has a more detailed description of the 28 vehicle classes used in
MOBILE6.
The MILE ACCUM RATE command requires input data only for the vehicle classes
being changed.
5.3.3 Operating Modes
Each MOBILES scenario had three operating modes. MOBILE6 does not use operating
mode and instead controls the effect of engine starts using the SOAK DISTRIBUTION and
STARTS PER DAY commands. The three MOBILES operating modes were:
PCCN : Percent of miles traveled in cold start mode for non-catalyst vehicles.
PCHC : Percent of miles traveled in hot start mode for all vehicles.
PCCC : Percent of miles traveled in cold start mode for catalyst vehicles.
The definition of MOBILES operating modes is the same as the bags of the Federal Test
Procedure (FTP). The cold start mode is bagl (PCCN and PCCC operating modes), and the hot
start mode is bag 3 (PCHC operating mode). The VMT remaining is assumed to be in a stabilized
mode, which is bag 2. The default operating mode fractions for MOBILES are the operating
modes of the FTP:
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Cold Start: 20.6 percent (both catalyst and non-catalyst).
Hot Start: 27.3 percent.
This means that 43 percent of all starts are cold (20.67(20.6+27.3)) and 57 percent are hot
starts. In the FTP, a cold start is an engine start after at least 12 hours of soak, and a hot start is an
engine start done after 10 minutes of soak (after bag 1 and bag 2 are completed).
If the MOBILES input uses these (default) operating modes, then no user input is required
for MOBILE6 input, and the default MOBILE6 values related to operating mode will be used.
However, if the user did not specify the default (FTP) case, then corresponding MOBILE6 input
values must be calculated.
Soak Distribution
The first step is to determine an engine start soak distribution that contains only FTP hot
starts and FTP cold starts. Using the MOBILE6 SOAK DISTRIBUTION command, this can be
represented by entering soak distribution fractions of zero for all times except 10 minutes (hot
start) and 720 minutes (cold start) for every hour of the day. The only two non-zero values
entered in the distribution will be:
10-Minute Soak Fraction = PCHC/(PCHC + PCCC).
720-Minute Soak Fraction = PCCC/(PCHC + PCCC).
The percent of miles traveled in cold start mode for non-catalyst vehicles (PCCN) is not
used because most vehicles will be equipped with catalysts. MOBILE6 does not allow for
different soak distributions for catalyst and non-catalyst vehicles. The effect of soak time on the
emissions of non-catalyst vehicles is handled internally by MOBILE6.
Engine Starts Per Day
In addition to the change in the engine start soak distribution, the user must also change
the number of engine starts per day assumed by MOBILE6. In MOBILES the number of starts
per mile of vehicle travel does not change with age and is set by the operating mode fractions. In
MOBILE6, the number of engine starts per day does not vary and is not affected by changes in
the miles traveled each day. This means that the number of starts per mile of vehicle travel varies
depending on the daily VMT in MOBILE6. This difference makes precise conversion of
MOBILES assumptions into MOBILE6 difficult.
There is a separate entry in MOBILE6 for each of the 28 vehicle classes. Only light-duty
vehicles, light-duty trucks, and motorcycles use the estimate of starts per day in MOBILE6.
Heavy-duty vehicle classes do not estimate engine start emissions separately and will not use the
estimate of starts per day entered by the user.
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The average LDGV in MOBILES travels 10,528 miles each year, or 28.8 miles per day
(10,528/365). The sum of the PCCC and PCHC indicates that the fraction of those miles are
driven each day in "bag 1 or bag 3 mode". Both bag 1 and bag 3 (represented by the PCCC and
PCHC values) have 3.59 miles of travel. The number of engine starts is the number of miles
driven each day in "bag 1 or bag 3 mode", and it is then divided by the 3.59 miles per start. The
value of engine starts per day is entered into MOBILE6 using the STARTS PER DAY command.
The average annual mileage accumulation rate for a vehicle class in a calendar year will
vary depending on the age distribution, annual mileage accumulation rates by vehicle age and the
fraction of diesel vehicles in each model year. MOBILE6 will calculate the daily miles per day
for your specific set of values when you specify database output using the aggregated output
option. The following table gives the default annual mileage for all MOBILE6 vehicle categories
in the calendar year 2000:
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National Average Miles Per Day by Vehicle Class for
Calendar Year 2000
Vehicle
Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Vehicle
Type
LDGV
LDGT1
LDGT2
LDGT3
LDGT4
HDGV2B
HDGV3
HDGV4
HDGV5
HDGV6
HDGV7
HDGV8A
HDGV8B
LDDV
LDDT12
HDDV2B
HDDV3
HDDV4
HDDV5
HDDV6
HDDV7
HDDT8A
HDDT8B
MC
HDGB
HDDBT
HDDBS
LDDT34
Average
Annual
Mileage
Accumulation
10,528
12,529
12,529
12,185
12,185
12,618
11,021
6,891
9,412
9,187
7,801
7,251
0
6,906
3,628
15,747
16,881
21,813
22,850
22,494
21,335
37,483
58,276
3554
9939
34838
9939
15,612
Average
Miles Per
Day
28.8
34.3
34.3
33.4
33.4
34.6
30.2
18.9
25.8
25.2
21.4
19.9
0.0
18.9
9.9
43.1
46.2
59.8
62.6
61.6
58.5
102.7
159.7
9.7
27.2
95.4
27.2
42.8
For example, for passenger cars using the default FTP values for PCCC and PCHC, the
calculation would be:
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November 4, 2002
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Starts Per Day = (Miles Per Day)*(PCCC+PCHC)/(3.59 miles per start)
or
Starts Per Day = (10,528/365)*(0.206+0.273)/3.59 = 3.85 engine starts per day.
5.3.4 Average Speed
MOBILES allowed the entry of a single average speed or the entry of a separate average
speed for each of the eight vehicle types. In MOBILE6, the average speed is a distribution of
average speeds at a given hour on a given roadway type for all vehicle types together. As a result,
it is not possible to model a separate average speed for each vehicle type in a single MOBILE6
run. Multiple MOBILE6 runs can be done to model each vehicle class separately to allow for
different average speeds. The distribution of average speeds is entered into MOBILE6 using the
SPEED VMT command.
When using MOBILES, an average speed of 19.6 mph was often used to represent a
national average urban driving speed as a default. If the default MOBILES speed of 19.6 mph
was used as a national average, there is no required MOBILE6 input for speed and no
conversions are required.
The AVERAGE SPEED command has been added to MOBILE6 to assist in the use of
MOBILE6 to model a single average speed. The same effect can be obtained using a careful
combination of the SPEED VMT and VMT BY FACILITY commands as discussed below.
However, the steps necessary to model a single average speed using MOBILE6 are often
complex and prone to error. In most cases when modeling a single average speed, users should
use the AVERAGE SPEED command.
In order to model a single, area-wide average speed, the average speed must be
disassociated by roadway type. This is discussed below. If the MOBILES input is intended to
represent a single roadway type, the user should read the following section describing how to
select a single roadway type using the VMT BY FACILITY command. If the single roadway type
is a freeway, then the user must also adjust the freeway speed to account for freeway ramps
separately from freeway VMT not on freeway ramps. In all cases, the average speed might not fit
precisely into one of the 14 average speed bins and will need to be represented as an interpolation
between two average speed bins. This is discussed below. Once the distribution of average
speeds has been determined, the same distribution should be entered for every hour of the day
using the SPEED VMT command.
The values in the tables in Appendix F have been calculated using the methods described
below by assuming the MOBILE6 default values for the distribution of VMT by roadway type.
Since MOBILES did not have inputs related to VMT by roadway type, these tables may be all
that is required for conversion of MOBILES average speed to MOBILE6 distributions. Users are
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encouraged to use these tables. The average speeds are in mile-per-hour increments. If users have
decimal values for MOBILES average speed, users may interpolate the values shown in the
tables. Since the MOBILE6 default distribution of VMT by roadway type was used, translating
MOBILES average speeds becomes unrealistic at higher speeds. If users intend to model area-
wide average speeds over 40 mph, users should consider obtaining local distribution of VMT by
roadway type and entering the distribution into MOBILE6 using the VMT BY FACILITY
command.
If local values for VMT by roadway type are to be used, the tables in Appendix F should
not be used, and the user must make the appropriate calculations described below using the local
VMT by roadway type distribution.
Average Speed for All Roadways
In a simple case, using MOBILES, the user entered a single average speed. Roadway type
was not an input for MOBILES, and it was assumed that the single average speed was an
aggregation of all speeds on all roadway types. MOBILE6 has different speed adjustments for
each of four roadway types.
When a user input of a single average speed is meant to apply to all roadway types (i.e.,
area-wide average speed), the single average speed value must be distributed among the roadway
types. The default distribution of vehicle miles traveled on each of the four MOBILE6 roadway
types is:
34.2 percent of total daily VMT occurs on freeways.
49.8 percent of total daily VMT occurs on arterial/collectors.
13.0 percent of total daily VMT occurs on local roadways.
3.0 percent of total daily VMT occurs on freeway ramps.
This same distribution is used for each hour of the day. The default daily average speed
for these roadway types is:
36.5 mph for freeways.
31.2 mph for arterial/collectors.
12.9 mph for local roadways.
34.6 mph for freeway ramps.
The average speed for local roadways and freeway ramps are constant for all hours of the
day and cannot be changed by user inputs. A harmonic mean of the average speeds, weighted by
the VMT fractions, gives the default daily average speed assumed by MOBILE6:
Avg. Speed = l/( (1/36.5)*0.342 + (1/31.2)*0.498 + (1/12.9)*0.13 + (1/34.6)*0.03 ) = 27.6 mph
-230- November 4, 2002
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Since the user knows the daily average speed desired ("target" speed), and the daily
average speeds for local roadways and freeway ramps cannot be changed by user inputs, the
above equation can be represented with a single unknown value, X, which is the change in speed
of the freeway and arterial/collector roadway categories. This formulation assumes that the
increase in speed occurs only for freeway and arterial/collector roadway categories and that the
increase is the same proportional change on both roadway types. This also assumes that the mix
of roadway types is not changed.
Avg. Speed = l/( (1/(36.5*X))*0.342 + (1/(31.2*X))*0.498 + (1/12.9)*0.13 + (1/34.6)*0.03 )
When we solve for the value, X, in terms of the average speed, we get:
X = 0.02533/(( 1 / Avg. Speed ) - 0.01095)
The value, X, would be used to determine the average speed necessary for input into
MOBILE6 for freeways and for arterial/collector roadways to be consistent with the overall
average speed provided by the user. For example, if the overall average speed is 32 mph, then:
X = 0.02533/ (( 1 / 32 ) - 0.01095) = 1.2475
Then, the input for average speed for MOBILE6 would be:
Average Freeway Speed = 36.5 * 1.2475 = 45.5 mph
Average Arterial/Collector Speed = 31.2 * 1.2475 = 38.9 mph
This average freeway speed has already accounted for freeway ramps and will not need
the adjustment described later in this section. However, these values cannot be directly entered
into the model and must be converted to a VMT distribution by average speed as described
below in calculating the average speed for a single roadway. These VMT distribution values will
be entered into the MOBILE6 model using the SPEED VMT command. The same speed
distribution for arterial/collectors and freeways will be used for each hour of the day.
Average Speed for a Single Roadway (Not Freeways)
Once you know the average speed for a roadway, you can convert the single speed value
to a distribution of VMT by average speed. This distribution is entered into the MOBILE6 model
using the SPEED VMT command.
There are 14 speed bins to describe the distribution of VMT by average speed separately
for freeways and arterial/collector roadways (described above). It is likely that the speed value
does not fall precisely at the mean value in any of the 14 speed bins. Single average speed inputs
must be interpolated using a harmonic mean to give a distribution of average speeds.
-231 - November 4, 2002
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For example, we have an average speed on arterial/collectors of 43.5 mph. We do not
have the actual distribution of average speed VMT for this average speed. The means of the 14
available speed bins do not include this value, so a combination of two speed bins are needed.
The general harmonic mean formula would be:
Speed = l/(X/(Lower Speed Bin Speed) + (l-X)/(Higher Speed Bin Speed))
or
X = (1/Speed-1/Higher Speed Bin Speed)/(l/Lower Speed Bin Speed-1/Higher Speed Bin Speed)
Where:
X VMT fraction for the lower speed bin (0 < X < 1)
Speed The average speed used in MOBILES
Lower Speed Bin The nearest speed bin lower than the Target Speed
Higher Speed Bin The nearest speed bin higher than the Target Speed
For this example, the mean of the lower speed bin would be 40 mph, and the mean of the
higher speed bin would be 45 mph. The value of X is then 0.276. This would be the value for the
40 mph speed bin in the speed VMT distribution for arterial/collector roadways. The 45 mph
speed bin would have the remainder (0.724, or (1-X)). All other speed bins will be zero for
arterial/collector roadway distributions. This VMT distribution will be entered into the
MOBILE6 model using the SPEED VMT command. The same distributions will be repeated for
all hours of the day.
If the roadway type is a freeway, and freeway ramps have not already been accounted for
in the calculation of average speeds, then users should follow the directions below for freeways.
Once a freeway average speed that accounts for freeway ramps has been determined, then the
VMT distribution can be calculated using the above method.
Average Speed for Freeways
When modeling freeways exclusively, if current estimates of average speed do not
include freeway ramp travel, then the current speed estimate should be directly used for the
SPEED VMT command input. The speed may need to be distributed among the speed bins (as
described above). When freeway average speeds include ramp activity, since MOBILE6 models
freeways and freeway ramps separately, the freeway average speed estimate must be adjusted to
exclude the effects of ramp activity. This adjustment is described below.
MOBILE6 models freeways and freeway ramps separately, allowing the impact of
freeway ramps to be accounted for explicitly in freeway segments. The average speed of freeway
ramps cannot be changed by the user. If the user has changed the distribution of VMT by facility,
-232- November 4, 2002
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which affects the fraction of freeway VMT that occurs on freeway ramps, this will affect the
overall average speed assumed for freeways. The equations below assume the default fraction of
all freeway VMT that occurs on freeway ramps (8 percent). The coefficients must be recalculated
if a different VMT fraction is to be used.
The average speed on freeways is the harmonic mean of the average speed on freeway
ramps and the average speed on the remaining freeway segments. Using the default fractions and
speeds described above:
Speed = 1/((Non-Ramp VMT/Non-Ramp Speed) + (Ramp VMT/Ramp Speed))
Speed = l/((34.2/(34.2+3.0))/36.5 + (3.07(34.2+3.0))/34.6) = 36.4 mph
Where:
34.2 is the default Non-Ramp VMT fraction for freeways.
3.0 is the default Ramp VMT fraction for freeways.
36.5 is the default Non-Ramp average speed for freeways.
34.6 is the default Ramp average speed for freeways.
The VMT fractions must be normalized to include only freeway (non-ramp) and freeway
ramp VMT (as shown in the equation above). The sum of non-ramp VMT and ramp VMT will
be 1. Since the average speed on freeway ramps is not a user input, the appropriate average speed
for non-ramp segments can be determined once the ramp VMT fraction (and thus, non-ramp
VMT) is known.
Non-Ramp Speed = (1-Ramp VMT)/(1/Speed - Ramp VMT/Ramp Speed)
Because ramp speed is a constant, if the default normalized ramp VMT fraction is used (8
percent), this calculation simplifies to:
Non-Ramp Speed = 0.92/(1 /Speed - 0.00231)
For example, if my average speed on freeways (including ramps) is 40.0 mph, and I am
using the default ramp VMT fraction of 8 percent, the non-ramp freeway speed is:
Non-Ramp Speed = 0.92/(1/40 - 0.00231) = 40.6 mph
Once this average speed of 40.6 mph is known, a VMT distribution by average speed can
be calculated using the method above. The VMT distribution by average speed for freeways
would be entered into MOBILE6 using the SPEED VMT command. The same distributions will
be repeated for all hours of the day.
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5.3.5 Roadway Type
MOBILES did not differentiate by vehicle roadway (facility) type. Since there was no
user-supplied input for MOBILES, there is no input value in a MOBILES input corresponding to
roadway type in MOBILE6. However, because MOBILE6 assumes some activity on each
roadway type, if the user wants the MOBILES input that is to be converted to MOBILE6 to
represent a single roadway type, then the user must specify which roadway type is to be modeled.
This is done using the VMT BY FACILITY command in MOBILE6. Setting the fraction of
VMT to 1.0 for the roadway type of interest (and setting the VMT for the other roadway types to
zero), the user can specify which roadway type is desired.
There are four roadway types simulated by MOBILE6:
Freeways
Arterial/Collectors
Local
Freeway Ramps
MOBILE6 separates all freeway VMT into freeway (non-ramp) VMT and freeway ramp
VMT. When modeling freeways, if the user does not know the split between ramp and non-ramp
freeway VMT, the default MOBILE6 value should be used. MOBILE6 assumes that 8 percent of
all freeway VMT occurs on ramps.
There is no average speed input for either the local roadways or freeway ramps.
-234- November 4, 2002
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Appendix A
Alphabetical List of MOBILE6 Commands
Command Name
ABSOLUTE HUMIDITY
ADDITIONAL HAPS
AGGREGATED OUTPUT
AIR TOXICS
ALTITUDE
ANTI-TAMP PROG
AVERAGE SPEED
BAROMETRIC PRES
CALENDAR YEAR
CLOUD COVER
DAILY OUTPUT
DATABASE AGES
User's Guide Section
External Conditions
2.8.6.6
Specifying Pollutants
and Emission Rates
2.8.3.8
Database Output
2.8.5.1. k
Specifying Pollutants
and Emission Rates
2.8.3.7
External Conditions
2.8.6.5
State Programs
2.8.9.3
Activity
2.8.8.2.d
External Conditions
2.8.6.9
External Conditions
2.8.6.1
External Conditions
2.8.6.7.a
Database Output
2.8.5.1. j
Database Output
2.8.5.1. g
Command
Input File
Section
Run or
Scenario
Scenario
Header
Header
Scenario
Run
Scenario
Scenario
Scenario
Run or
Scenario
Header
Header
Command
Parameter
Type
Value
External file
On/Off
Pollutant
choice
Option
Program
description
Value
Values
Value
Value
On/Off
Vehicle age
choice
Required
Command?
Yes
Command Function
Absolute humidity in grains per pound.
Allows the user to enter emission factors or air toxic ratios for
additional air toxic pollutants.
Database output by daily time periods aggregated to the level of
the descriptive output.
Enables the computation of air toxic emissions and specifies
which of these pollutants are calculated and reported.
High or low altitude of area evaluated.
Anti-Tampering Programs.
Allows the user to enter a single average speed value, rather
than an average speed distribution.
Allows the user to specify a daily average barometric pressure.
Calendar year of scenario evaluated.
Allows user to input fraction of cloud cover for a given day.
Database output by time periods.
Limits which of the 25 vehicle ages have emissions reported in
database output format.
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November 4, 2002
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Command Name
DATABASE EMISSIONS
DATABASE FACILITIES
DATABASE HOURS
DATABASE OPTIONS
DATABASE OUTPUT
DATABASE VEHICLES
DATABASE YEARS
DIESEL FRACTIONS
DIESEL SULFUR
DIURN SOAK ACTIVITY
E200
E300
EMISSIONS TABLE
END OF RUN
EVALUATION MONTH
User's Guide Section
Database Output
2.8.5.1. d
Database Output
2.8.5.1.6
Database Output
2.8.5.1. h
Database Output
2.8.5.1. c
Database Output
2.8.5.1.a
Database Output
2.8.5.1. f
Database Output
2.8.5.1.1
Fleets
2.8.7.2
Fuels
2.8.10.3
Activity
2.8.8.7
Fuels
2.8.10.7.d
Fuels
2.8.10.7.6
Database Output
2.8.5.2
Separators
2.8.2.5
External Conditions
2.8.6.2
Command
Input File
Section
Header
Header
Header
Header
Header
Header
Header
Run or
Scenario
Scenario
Scenario
Scenario
Scenario
Header
End of Run
Scenario
Command
Parameter
Type
Etype choice
Facility choice
Hours of day
choice
File name
On/Off
Vehicle choice
Model year
choice
Values
Value
External file
Value
Value
File name
Value
Required
Command?
Yes*
Yes*
Yes*
Command Function
Limits which of the eight types of emissions are reported in
database output format.
Limits which of five roadway types have emissions reported in
database output format.
Limits which of the 24 hours of the day have emissions reported
in database output format.
Specifies a name for the external file holding a set of database
output selection records.
Specifies MOBILES to report output in database format.
Limits which of the 28 vehicle types have emissions reported in
database output format.
Limits which of the 25 model years, based on the calendar year
chosen, have emissions reported in database output format.
Allows user-supplied alternate diesel sales fractions.
Allows user to input the average diesel fuel sulfur level for the
scenario. 'Required if PARTICULATES command is used.
Specifies alternative distribution of diurnal soak times.
Allows the user to specify the percentage of vapor that a given
gasoline fuel produces at 200 degrees F.
* Required if the AIR TOXICS command is used.
Allows the user to specify the percentage of vapor that a given
gasoline fuel produces at 300 degrees F.
* Required if the AIR TOXICS command is used.
Specifies a file name for the database output file.
Required to separate multiple runs in command input files.
Specifies January 1 or July 1 for calendar year of interest.
-236-
November 4, 2002
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Command Name
EXPAND BUS EPS
EXPAND EVAPORATIVE
EXPAND EXHAUST
EXPAND HDDV EFS
EXPAND HDGV EFS
EXPAND LOT EFS
EXPRESS HC AS NMHC
EXPRESS HC AS NMOG
EXPRESS HC AS THC
EXPRESS HC AS TOG
EXPRESS HC AS VOC
FUEL PROGRAM
FUEL RVP
User's Guide Section
Descriptive Output
2.8.4.1. c
Descriptive Output
2.8.4.1.6
Descriptive Output
2.8.4.1. d
Descriptive Output
2.8.4.1. c
Descriptive Output
2.8.4.1. c
Descriptive Output
2.8.4.1. c
Specifying Pollutants
and Emission Rates
2.8.3.5
Specifying Pollutants
and Emission Rates
2.8.3.5
Specifying Pollutants
and Emission Rates
2.8.3.5
Specifying Pollutants
and Emission Rates
2.8.3.5
Specifying Pollutants
and Emission Rates
2.8.3.5
Fuels
2.8.10.1
Fuels
2.8.10.5
Command
Input File
Section
Run
Run
Run
Run
Run
Run
Run
Run
Run
Run
Run
Run or
Scenario
Run or
Scenario
Command
Parameter
Type
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
Program
description
Values
Required
Command?
Yes
Command Function
Directs M6 to report gas, urban and school bus categories
separately.
Display all 6 evaporative emission types in descriptive output.
Causes start, running and total exhaust EFs to be displayed in
descriptive output.
Directs MOBILES to display EFs by eight HDDV classes.
Directs MOBILES to display EFs by eight HDGV classes.
Directs MOBILES to display EFs by six LOT classes.
Directs MOBILES to output exhaust HC as non-methane
hydrocarbons.
Directs MOBILES to output exhaust HC as non-methane organic
gases.
Directs MOBILES to output exhaust HC as total hydrocarbons.
Directs MOBILES to output exhaust HC as total organic gases.
Directs MOBILES to output exhaust HC as volatile organic
compounds.
Designates fuel sulfur level of gasoline and whether RFC use
should be assumed.
Required input of average fuel Reid vapor pressure.
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November 4, 2002
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Command Name
GAS AROMATIC%
GAS BENZENE%
GAS OLEFIN%
GASOLINE SULFUR
HOT SOAK ACTIVITY
HOURLY TEMPERATURES
IDLE PM EMISSIONS
I/M COMPLIANCE
I/M CUTPOINTS
I/M DESC FILE
I/M EFFECTIVENESS
I/M EXEMPTION AGE
I/M GRACE PERIOD
User's Guide Section
Fuels
2.8.10.7.a
Fuels
2.8.10.7.C
Fuels
2.8.10.7.b
Fuels
2.8.10.2
Activity
2.8.8.6
External Conditions
2.8.6.4
Descriptive Output
2.8.4.1. f
State Programs
2.8.9.4.e
State Programs
2.8.9.4.g
State Programs
2.8.9.4.I
State Programs
2.8.9.4.k
State Programs
2.8.9.4.h
State Programs
2.8.9.4.I
Command
Input File
Section
Scenario
Scenario
Scenario
Scenario
Scenario
Run or
Scenario
Run
Run
Run
Run
Run
Run
Run
Command
Parameter
Type
Value
Value
Value
Value
External file
Values
On/Off
Value
External file
External file
Value
Value
Value
Required
Command?
Yes*
Yes*
Yes*
Yes*
Command Function
Allows the user to specify the aromatic content of gasoline on a
volume of fuel percentage basis.
* Required if the AIR TOXICS command is used.
Allows the user to specify the benzene content of gasoline on a
volume of fuel percentage basis.
* Required if the AIR TOXICS command is used.
Allows the user to specify the olefin content of gasoline on a
volume of fuel percentage basis.
* Required if the AIR TOXICS command is used.
Allows user to enter alternate sulfur content of gasoline (ppm)
that overrides MOBILE6 default of 300 ppm. Same as SULFUR
CONTENT command.
Specifies alternative distribution of lengths of hot soaks.
Allows entry of 24 hourly temperatures.
Required unless MIN/MAXTEMP is used.
Controls the output idle mode paniculate emission factors for
heavy-duty diesel vehicle classes 2b through 8b and diesel
buses.
Required input indicating percentage of total vehicle fleet
certified or waived by I/M program.
Required command for cutpoints if IM240 used. Do not use with
other exhaust or evaporative I/M programs.
Optional external input file containing I/M program description
records.
Reduce I/M effectiveness to account for Test and Repair losses.
Optional command indicating age that vehicle automatically
becomes exempt from I/M program.
Optional command indicating when vehicle first becomes subject
to I/M program.
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November 4, 2002
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Command Name
I/M MODEL YEARS
I/M PROGRAM
I/M STRINGENCY
I/M VEHICLES
I/M WAIVER RATES
MILE ACCUM RATE
MIN/MAXTEMP
MOBILES BATCH FILE
MOBILES INPUT FILE
MPG ESTIMATES
NGVEF
NGV FRACTION
94+ LOG IMP
User's Guide Section
State Programs
2.8.9.4.b
State Programs
2.8.9.4.a
State Programs
2.8.9.4.d
State Programs
2.8.9.4.C
State Programs
2.8.9.4.f
Fleets
2.8.7.3
External Conditions
2.8.6.3
Separators
2.8.2.2
Separators
2.8.2.1
Specifying Pollutants
and Emission Rates
2.8.3.9
Fleets
2.8.7.6
Fleets
2.8.7.5
Alternative Regulations
and Control Programs
2.8.11.4
Command
Input File
Section
Run
Run
Run
Run
Run
Run
Run or
Scenario
Header
Header
Scenario
Run
Run
Run
Command
Parameter
Type
Values
Values
Values
Vehicle choice
Values
External file
Values
On/Off
External file
External file
External file
External file
Required
Command?
Yes*
Yes
Command Function
Required command indicating vehicle model years subject to I/M
program.
Required command indicating program start and end dates,
frequency and test type.
Required command indicating initial test failure rate (%) for pre-
1981 LDGVsand pre-1984 LDGTs.
Required command indicating vehicle types subject to I/M.
Required command indicating percentage of vehicles failing
initial I/M test and do not have to pass a retest.
Allows user to supply annual accumulation rates by age for each
of the 28 vehicle types.
Specifies minimum and maximum daily temperature.
* This command is required unless HOURLY TEMPERATURES
is used.
Identifies MOBILE6 input file as batch file as opposed to a
regular command input file.
Identifies MOBILE6 input file as a regular command input file as
opposed to a batch input file.
Allows the user to enter fuel economy performance data by
vehicle class and model year to replace the default values built
into the model.
Allows the user to enter alternate NGV emission factors for each
of the 28 vehicle types, for each of the three pollutants, and
(where applicable) for running and start emissions. Must be
used in conjunction with NGV FRACTION command.
Indicates percentage of natural gas vehicles in each of the 28
vehicles classes.
Allows the user to input optional 1994 and later fleet penetration
fractions for light-duty gasoline vehicles under the Tier 1, NLEV
(or California LEV 1), and Tier 2 standards.
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November 4, 2002
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Command Name
NO 2007 HDDV RULE
NO CLEAN AIR ACT
NO DEFEAT DEVICE
NO DESC OUTPUT
NO I/M TTC CREDITS
NO NOX PULL AHEAD
NO REBUILD
NO REFUELING
NOTIER2
OXYGENATE
OXYGENATED FUELS
User's Guide Section
Alternative Regulations
and Control Programs
2.8.11.5
Alternative Regulations
and Control Programs
2.8.11.1
Alternative Regulations
and Control Programs
2.8.11.2.a
Descriptive Output
2.8.4.1. b
State Programs
2.8.9.4.J
Alternative Regulations
and Control Programs
2.8.11.2.b
Alternative Regulations
and Control Programs
2.8.11.2.C
Specifying Pollutants
and Emission Rates
2.8.3.6
Alternative Regulations
and Control Programs
2.8.11.3.a
Fuels
2.8.10.7.f
Fuels
2.8.10.4
Command
Input File
Section
Run
Run
Run
Header
Run
Run
Run
Run
Run
Scenario
Run or
Scenario
Command
Parameter
Type
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
Value
Values
Required
Command?
Yes*
Command Function
Allows the user to disable the 2007 heavy duty vehicle emission
standards.
Allows users to model vehicle emissions as if the Federal Clean
Air Act Amendments of 1990 had not been implemented.
Allows users to turn off the effects of the heavy-duty diesel
vehicle NOx off-cycle emission effects (defeat device
emissions).
Optional command that prevents production of descriptive
output.
Optional command to eliminate credit for a technician training
program.
Allows the user to turn off the effects of the Pull Ahead mitigation
program used to reduce heavy-duty diesel vehicle off-cycle
emissions.
Allows the user to turn off the effects of the Rebuild mitigation
program used to reduce heavy-duty diesel off-cycle emissions.
Allows user to "zero out" refueling (Stage 2) emissions, which
then must be accounted for in stationary source part of SIP.
Allows the user to disable the Tier 2 emission standards and fuel
sulfur requirements.
Allows the user to specify the particular gasoline fuel oxygenate
type, the fuel oxygenate content (percent by volume), and the
market share. This command supercedes the OXYGENATED
FUELS command if the AIR TOXICS command is used.
* Required if the AIR TOXICS command is used.
Allows modeling of the effects of use of oxygenated fuels on
exhaust emissions.
-240-
November 4, 2002
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Command Name
PARTICULATE EF
PARTICULATES
PARTICLE SIZE
PEAK SUN
POLLUTANTS
REBUILD EFFECTS
REG DIST
RELATIVE HUMIDITY
REPORT FILE
RUN DATA
RVP OXY WAIVER
SCENARIO RECORD
User's Guide Section
Specifying Pollutants
and Emission Rates
2.8.3.3
Specifying Pollutants
and Emission Rates
2.8.3.2
Specifying Pollutants
and Emission Rates
2.8.3.4
External Conditions
2.8.6.7.b
Specifying Pollutants
and Emission Rates
2.8.3.1
Alternative Regulations
and Control Programs
2.8.11.2.d
Fleets
2.8.7.1
External Conditions
2.8.6.8
Descriptive Output
2.8.4.1.a
Separators
2.8.2.3
Fuels
2.8.10.7.g
Separators
2.8.2.4
Command
Input File
Section
Scenario
Header
Scenario
Run or
Scenario
Header
Run
Run
Scenario
Header
End of
Header
Scenario
Start of
Scenario
Command
Parameter
Type
External files
Pollutant
choice
Value
Values
Pollutant
choice
Value
External file
Values
File name
Value
Required
Command?
Yes*
Yes*
Yes
Yes
Command Function
Specifies the location of the data files that contain the paniculate
emission factors. 'Required if PARTICULATES command is
used.
Enables the computation of paniculate matter (PM) and related
emissions and specifies which of these pollutants are calculated
and reported.
Allows the user to specify the maximum paniculate size cutoff
(PSC) that is used by the model. 'Required if PARTICULATES
command is used.
Allows input of 2 daily times demarcating period of peak sun.
Controls which HC, CO, and NOx pollutants will be calculated
and output to the database report and descriptive output.
Allows the user to change the Rebuild program effectiveness
rate used to reduce heavy-duty diesel vehicle NOx off -cycle
emissions.
Allows user to supply vehicle registration distributions by age for
all 16 composite vehicles types.
Allows user to specify hourly relative humidity values and to
relate these relative humidity values directly to the
hourly temperature values(see also the
BAROMETRIC PRES command).
Specifies name for descriptive output file(s).
Marks end of Header section and beginning of Run section of
regular MOBILE6 command input file.
Enables the user to specify whether a Reid vapor pressure
(RVP) waiver has been granted to allow "splash" blending of
alcohol-based oxygenates.
Allows user to label individual scenario results. Marks start of
new scenario.
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November 4, 2002
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Command Name
SEASON
SOAK DISTRIBUTION
SPEED VMT
SPREADSHEET
STAGE II REFUELING
START DIST
STARTS PER DAY
SULFUR CONTENT
SUNRISE/SUNSET
T2 CERT
T2 EVAP PHASE-IN
User's Guide Section
Fuels
2.8.10.6
Activity
2.8.8.5
Activity
2.8.8.2.C
Spreadsheet Output
2.8.4.2
State Programs
2.8.9.2
Activity
2.8.8.4
Activity
2.8.8.3
Fuels
2.8.10.2
External Conditions
2.8.6.7.C
Alternative Regulations
and Control Programs
2.8.11.3.d
Alternative Regulations
and Control Programs
2.8.11.3.b
Command
Input File
Section
Run or
Scenario
Scenario
Run or
Scenario
Header
Run
Run
Run
Scenario
Run or
Scenario
Run
Run
Command
Parameter
Type
Value
External file
External file
On/Off
Program
description
External file
External file
Value
Values
File name
External file
Required
Command?
Command Function
Allows users to specify winter or summer RFC independent of
evaluation month.
Allows user to enter soak duration distributions for each hour of
the day that will override MOBILES defaults.
Allows user to enter VMT distribution across 14 preselected
average speed ranges for each of the 24 hours of the day for
each scenario.
Instructs MOBILES to output the average calendar year
emission factors in a form suitable for direct input into a
spreadsheet program.
Allows modeling of impact of stage II "at-the-pump" vapor
recovery system for refueling emissions.
Allows user to change the default for the hourly temporal
distribution of engine starts (trips) across the day.
Allows user to change default average number of engine starts
per day per vehicle.
Allows user to enter alternate sulfur content of gasoline (ppm)
that overrides MOBILES default of 300 ppm.
Specifies times for sunrise and sunset for A/C calculations.
Allows the user to specify alternative Tier 2 50,000 mile
certification standards. Must be used to model the effects of
California's LEV II requirement.
Allows the user to replace the default phase-in fractions (by
certification bin) for the Tier 2 evaporative emissions standards,
permitting different phase-in schedules to be modeled. Also
necessary to model the evaporative effects of California's LEVII
requirement.
-242-
November 4, 2002
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Command Name
T2 EXH PHASE-IN
VMT BY FACILITY
VMT BY HOUR
VMT FRACTIONS
WEDATRILENDI
WEENTRILENDI
WE VEH US
WITH FIELDNAMES
User's Guide Section
Alternative Regulations
and Control Programs
2.8.11.3.C
Activity
2.8.8.2.a
Activity
2.8.8.2.b
Activity
2.8.8.1
Activity
2.8.8.8
Activity
2.8.8.9
Activity
2.8.8.10
Database Output
2.8.5.1. b
Command
Input File
Section
Run
Run or
Scenario
Run or
Scenario
Run or
Scenario
Run or
Scenario
Run or
Scenario
Scenario
Header
Command
Parameter
Type
External file
External file
External file
Values
External file
External file
On/Off
On/Off
Required
Command?
Command Function
Allows the user to replace the default phase-in fractions (by
certification bin) for the Tier 2 exhaust emission standards,
allowing different phase-in schedules to be modeled. Also
necessary to model the exhaust effects of the California LEV II
requirement.
Allows user to supply alternate VMT distributions by facility type
that override MOBILES defaults for each scenario.
Allows user to supply alternate hourly distributions of VMT that
override MOBILES defaults for each scenario.
Allows user to apply alternate vehicle miles traveled fractions by
each of 16 combined vehicle types.
Allows user to supply alternate weekday hourly running loss trip
length distribution.
Allows user to supply alternate weekend hourly running loss trip
length distribution.
Directs MOBILES to use the weekend activity fractions in its
calculations.
Specifies that a header record of field names is to be generated
for the database output.
-243-
November 4, 2002
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Appendix B
MOBILE6 Input Data Format Reference Tables
Table 1: Composite Vehicle Classes for Vehicle Registration Data and Vehicle Miles Traveled Fractions (REG DIST and VMT FRACTIONS
Commands)
Number
1
2
o
J
4
5
6
7
8
9
10
11
12
13
14
15
16
Abbreviation
LDV
LDT1
LDT2
LDT3
LDT4
HDV2B
HDV3
HDV4
HDV5
HDV6
HDV7
HDV8A
HDV8B
HDBS
HDBT
MC
Description
Light-Duty Vehicles (Passenger Cars)
Light-Duty Trucks 1 (0-6,000 Ibs. GVWR, 0-3,750 Ibs. LVW)
Light-Duty Trucks 2 (0-6,000 Ibs. GVWR, 3,751-5,750 Ibs. LVW)
Light-Duty Trucks 3 (6,001-8,500 Ibs. GVWR, 0-5,750 Ibs. ALVW*)
Light-Duty Trucks 4 (6,001-8,500 Ibs. GVWR, 5,751 Ibs. and greater ALVW)
Class 2b Heavy-Duty Vehicles (8,501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Vehicles (>60,000 Ibs. GVWR)
School Buses
Transit and Urban Buses
Motorcycles (All)
* ALVW = Alternative Loaded Vehicle Weight:
(GVWR)
The adjusted loaded vehicle weight is the numerical average of the vehicle curb weight and the gross vehicle weight rating
-244-
November 4, 2002
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Table 2:
Appendix B
MOBILE6 Input Data Format Reference Tables
Composite Vehicle Types for Diesel Sales Fractions
(DIESEL FRACTIONS Command)
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Abbreviation
LDV
LDT1
LDT2
LDT3
LDT4
HDV2B
HDV3
HDV4
HDV5
HDV6
HDV7
HDV8A
HDV8B
HDBS
Description
Light-Duty Vehicles (Passenger Cars)
Light-Duty Trucks 1 (0-6,000 Ibs. GVWR, 0-3750 Ibs. LVW)
Light-Duty Trucks 2 (0-6,000 Ibs. GVWR, 3751-5750 Ibs. LVW)
Light-Duty Trucks 3 (6,001-8,500 Ibs. GVWR, 0-5750 Ibs. ALVW)
Light-Duty Trucks 4 (6,001-8,500 Ibs. GVWR, 5751 Ibs. and greater ALVW)
Class 2b Heavy-Duty Vehicles (8501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Vehicles (>60,000 Ibs. GVWR)
School Buses
-245-
November 4, 2002
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Appendix B
MOBILE6 Input Data Format Reference Tables
Table 3: Complete MOBILE6 Vehicle Classifications
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Abbreviation
LDGV
LDGT1
LDGT2
LDGT3
LDGT4
HDGV2B
HDGV3
HDGV4
HDGV5
HDGV6
HDGV7
HDGV8A
HDGV8B
LDDV
LDDT12
HDDV2B
HDDV3
HDDV4
HDDV5
HDDV6
HDDV7
HDDV8A
HDDV8B
MC
HDGB
HDDBT
HDDBS
LDDT34
Description
Light-Duty Gasoline Vehicles (Passenger Cars)
Light-Duty Gasoline Trucks 1 (0-6,000 Ibs. GVWR, 0-3750 Ibs. LVW)
Light-Duty Gasoline Trucks 2 (0-6,000 Ibs. GVWR, 3751-5750 Ibs. LVW)
Light-Duty Gasoline Trucks 3 (6,001-8,500 Ibs. GVWR, 0-5750 Ibs. ALVW)
Light-Duty Gasoline Trucks 4 (6,001-8,500 Ibs. GVWR, 5751 Ibs. and greater ALVW)
Class 2b Heavy-Duty Gasoline Vehicles (8501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Gasoline Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Gasoline Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Gasoline Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Gasoline Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Gasoline Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Gasoline Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Gasoline Vehicles (>60,000 Ibs. GVWR)
Light-Duty Diesel Vehicles (Passenger Cars)
Light-Duty Diesel Trucks 1 and 2 (0-6,000 Ibs. GVWR)
Class 2b Heavy-Duty Diesel Vehicles (8501-10,000 Ibs. GVWR)
Class 3 Heavy-Duty Diesel Vehicles (10,001-14,000 Ibs. GVWR)
Class 4 Heavy-Duty Diesel Vehicles (14,001-16,000 Ibs. GVWR)
Class 5 Heavy-Duty Diesel Vehicles (16,001-19,500 Ibs. GVWR)
Class 6 Heavy-Duty Diesel Vehicles (19,501-26,000 Ibs. GVWR)
Class 7 Heavy-Duty Diesel Vehicles (26,001-33,000 Ibs. GVWR)
Class 8a Heavy-Duty Diesel Vehicles (33,001-60,000 Ibs. GVWR)
Class 8b Heavy-Duty Diesel Vehicles (>60,000 Ibs. GVWR)
Motorcycles (Gasoline)
Gasoline Buses (School, Transit and Urban)
Diesel Transit and Urban Buses
Diesel School Buses
Light-Duty Diesel Trucks 3 and 4 (6,001-8,500 Ibs. GVWR)
-246-
November 4, 2002
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Table 4:
Appendix B
MOBILE6 Input Data Format Reference Tables
Daily Hour Mapping for Distribution of Vehicle Starts During the Day
(START DIST, HOURLY TEMPERATURE, and RELATIVE HUMIDITY Commands)
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Abbreviation
6 a.m.
7a.m.
8 a.m
9 a.m.
10 a.m
1 1 a.m.
12 Noon
1 p.m.
2p.m.
3 p.m.
4p.m.
5 p.m.
6p.m.
7p.m.
8p.m.
9p.m.
lOp.m
11 p.m.
12 Midnight
1 a.m.
2a.m.
3 a.m.
4 a.m.
5 a.m.
Description
6 a.m. through 6:59 a.m.
7 a.m. through 7:59 a.m.
8 a.m. through 8:59 a.m.
9 a.m. through 9:59 a.m.
10 a.m. through 10:59 a.m.
11 a.m. through 11:59 a.m.
12 Noon through 12:59 p.m.
1 p.m. through 1:59 p.m.
2 p.m. through 2:59 p.m.
3 p.m. through 3:59 p.m.
4 p.m. through 4:59 p.m.
5 p.m. through 5:59 p.m.
6 p.m. through 6:59 p.m.
7 p.m. through 7:59 p.m.
8 p.m. through 8:59 p.m.
9 p.m. through 9:59 p.m.
10 p.m. through 10:59 p.m.
11 p.m. through 11:59 p.m.
12 Midnight through 12:59 a.m.
1 a.m. through 1:59 a.m.
2 a.m. through 2:59 a.m.
3 a.m. through 3:59 a.m.
4 a.m. through 4:59 a.m.
5 a.m. through 5:59 a.m.
-247-
November 4, 2002
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Appendix B
MOBILE6 Input Data Format Reference Tables
Table 5: Average Speed Ranges for Speed Bins (SPEED VMT command)
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Abbreviation
2.5 mph
5 mph
10 mph
15 mph
20 mph
25 mph
30 mph
35 mph
40 mph
45 mph
50 mph
55 mph
60 mph
65 mph
Description
Miles with average speed 0-2.5 mph
Miles with average speed 2.5-7.5 mph
Miles with average speed 7.5-12.5 mph
Miles with average speed 12.5-17.5 mph
Miles with average speed 17.5-22.5 mph
Miles with average speed 22.5-27.5 mph
Miles with average speed 27.5-32.5 mph
Miles with average speed 32.5-37.5 mph
Miles with average speed 37.5-42.5 mph
Miles with average speed 42.5-47.5 mph
Miles with average speed 47.5-52.5 mph
Miles with average speed 52.5-57.5 mph
Miles with average speed 57.5-62.5 mph
Miles with average speed >62.5 mph
-248-
November 4, 2002
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Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Parti
Location
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
MOBILES Input
PROMPT=1,2,3,4
PROMPT=5
IOUNEW
Title (PROJID)
TAMFLG=1
TAMFLG=2
SPDFLG=1
SPDFLG=2
SPDFLG=3or4
VMFLAG=1
VMFLAG=2 or 3
MYMRFG=2
MYMRFG=3
MYMRFG=4
MYMRFG=I
NEWFLG=1
NEWFLG=2 or 3 or 4 or 6
NEWFLG=5
IMFLAG=1
IMFLAG=4 or 5
IMFLAG=2
IMFLAG=3
IMFLAG=6
Related MOBILE6 Commands
No longer needed with MOBILE6.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
See Section 2.6.3 describing how to enter comments.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
MOBILE6 Default. No required user input.
See SPEED VMT command. Additional guidance is provided in Chapter
5.
See WE DA TRI LEN DI or WE EN TRI LEN DI commands. Additional
guidance is provided in Chapter 5.
MOBILE6 Default. No required user input.
See VMT FRACTIONS command. Additional guidance is provided in
Chapter 5.
See MILE ACCUM RATE command. Additional guidance is provided in
Chapter 5.
See REG DIST command. Additional guidance is provided in Chapter 5.
See REG DIST and MILE ACCUM RATE commands. Additional
guidance is provided in Chapter 5.
MOBILE6 Default. No required user input.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
See NO CLEAN AIR ACT command.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
See I/M PROGRAM command.
See I/M PROGRAM command.
See I/M TTC EFF command.
-249-
November 4, 2002
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Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Part 2
Location
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
MOBILES Input
ALHFLG=1
ALHFLG=2 or 3
ATPFLG=1
ATPFLG=2
ATPFLG=3
ATPFLG=4
ATPFLG=5
ATPFLG=6
ATPFLG=7
ATPFLG=8
RLFLAG=lor3
RLFLAG=2 or 4
RLFLAG=5
LOCFLG=1,2
TEMFLG=lor2
OUTFMT=1, 2, 5 or 6
OUTFMT=3 or 4
IDLFLG=lor2
PRTFLG=1
PRTFLG=2
PRTFLG=3
PRTFLG=4
Related MOBILE6 Commands
MOBILE6 Default. No required user input.
See ABSOLUTE HUMIDITY; CLOUD COVER; PEAK SUN and
SUNRISE SUNSET commands for air-conditioning effects. MOBILE6 no
longer allows additional loading.
MOBILE6 Default. No required user input.
See ANTI-TAMP PROG command.
See I/M PROGRAM command.
This feature is not available in MOBILE6.
See ANTI-TAMP PROG and I/M PROGRAM commands.
See ANTI-TAMP PROG command. The purge program feature is no
longer available in MOBILE6.
See I/M PROGRAM command. The purge program feature is no longer
available inMOBILE6.
See ANTI-TAMP PROG and I/M PROGRAM commands. The purge
program feature is no longer available in MOBILE6.
MOBILE6 Default. No required user input.
See STAGE II REFUELING command.
See NO REFUELING command.
No longer needed with MOBILE6.
See MIN/MAX TEMPERATURE and HOURLY TEMPERATURES
commands.
See DESCRIPTIVE OUTPUT and DATABASE OUTPUT commands.
See DESCRIPTIVE OUTPUT command.
This feature is not available in MOBILE6.
See POLLUTANTS command.
See POLLUTANTS command.
See POLLUTANTS command.
See POLLUTANTS command.
-250-
November 4, 2002
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Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Part3
Location
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Control Section
Tampering Rates
VMT Mix Record
Mileage Accumulation Rates
Registration Distributions
Basic Emission Rates
New Evap Test Procedure Record
I/M Control Flag Record
I/M Control Flag Record
I/M Control Flag Record
I/M Control Flag Record
I/M Control Flag Record
I/M Control Flag Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
MOBILES Input
NMHFLG=1
NMHFLG=2
NMHFLG=3
NMHFLG=4
NMHFLG=5
HCFLAG=1
HCFLAG=3
HCFLAG=2
Tampering Rates
VMT Mix Record
Mileage Accumulation Rates
Registration Distributions
Basic Emission Rates
New Evap Test Procedure Record
Number of I/M program descriptive records
Override user specified I/M for Tier 1 vehicles
Technician Training and Certification = 1
Technician Training and Certification = 2
Remote Sensing Device Inspections = 1
Remote Sensing Device Inspections = 2
Start Year
Stringency Level
First Model Year
Last Model Year
Waiver Rates
Compliance Rate
Related MOBILE6 Commands
See EXPRESS HC AS THC command.
See EXPRESS HC AS NMHC command.
See EXPRESS HC AS VOC command.
See EXPRESS HC AS TOG command.
See EXPRESS HC AS NMOG command.
MOBILE6 Default. No required user input.
See DATABASE OUTPUT command.
See EXPAND EVAPORATIVE command.
This feature is not available in MOBILE6.
See VMT FRACTIONS command. Additional guidance is provided in
Chapter 5.
See MILE ACCUM RATE command. Additional guidance is provided ir
Chapter 5.
See REG DIST command. Additional guidance is provided in Chapter 5.
This feature is not available in MOBILE6.
MOBILE6 Default. No required user input.
No longer needed with MOBILE6.
This feature is not available in MOBILE6.
See I/M TTC EFF command.
MOBILE6 Default. No required user input.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
See I/M PROGRAM command.
See I/M STRINGENCY command.
See I/M MODEL YEARS command.
See I/M MODEL YEARS command.
See I/M WAIVER RATES command.
See I/M COMPLIANCE command.
-251-
November 4, 2002
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Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Part 4
Location
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
I/M Program Descriptive Record
Program Effectiveness Record
Program Effectiveness Record
Program Effectiveness Record
Program Effectiveness Record
Program Effectiveness Record
Alternate I/M Program Credit Files
ATP Descriptive Record
Functional Pressure Test Record
Functional Purge Test Record
Stage II Descriptive Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
MOBILES Input
Program Type
Alternate Effectiveness Rates Flag = 1
Alternate Effectiveness Rates Flag = 2
Inspection Frequency
Vehicle Types
Test Type
Non-default Cutpoints = 2
Alternate I/M Credits = 1
Alternate I/M Credits = 2
User-Supplied Cutpoint for HC
User-Supplied Cutpoint for CO
User-Supplied Cutpoint for NOX
Effectiveness Rate for HC emissions
Effectiveness Rate for CO emissions
Effectiveness Rate for NOX emissions
Effectiveness Rate for anti-tampering program (ATP)
Effectiveness Rate for pressure/purge checks
Alternate I/M Program Credit Files
ATP Descriptive Record
Functional Pressure Test Record
Functional Purge Test Record
Stage II Descriptive Record
Scenario Name
Fuel Volatility Class
Minimum Daily Temperature
Maximum Daily Temperature
Related MOBILE6 Commands
See I/M PROGRAM command.
MOBILE6 Default. No required user input.
See I/M EFFECTIVENESS command.
See I/M PROGRAM command.
See I/M VEHICLES command.
See I/M PROGRAM command.
See I/M CUTPOINTS command.
MOBILE6 Default. No required user input.
This feature is not available in MOBILE6.
See I/M CUTPOINTS command.
See I/M CUTPOINTS command.
See I/M CUTPOINTS command.
See I/M EFFECTIVENESS command.
See I/M EFFECTIVENESS command.
See I/M EFFECTIVENESS command.
This feature is not available in MOBILE6.
This feature is not available in MOBILE6.
This feature is not available in MOBILE6.
See ANTI-TAMP PROG command.
See I/M PROGRAM command.
This feature is not available in MOBILE6.
See STAGE II REFUELING command.
See section describing how to enter comments.
Normally, no required user input. If Reformulated Gasoline Flag = 2.
see FUEL PROGRAM command.
See MIN/MAX TEMP
See MIN/MAX TEMP
-252-
November 4, 2002
-------
Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Parts
Location
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Local Area Parameter Record
Oxygenated Fuels Descriptive Record
Gasoline Detergent Additive Parameter
Record
Trip Length Distribution Record
By Model Year Inclusion Record
Scenario Record
Scenario Record
Scenario Record
Scenario Record
Scenario Record
Scenario Record
Scenario Record
LEV Program Parameter Record
Diesel Sales Fractions
MOBILES Input
RVP Period 1
RVP Period 2
RVP Period 2 Start Year
Oxygenated Fuels Flag (OXYFLG) = 1
Oxygenated Fuels Flag (OXYFLG) = 2
Diesel Sales Flag (DSFLAG) = 1
Diesel Sales Flag (DSFLAG) = 2
Reformulated Gasoline Flag (RFGFLG) = 1
Reformulated Gasoline Flag (RFGFLG) = 2
Oxygenated Fuels Descriptive Record
Gasoline Detergent Additive Parameter Record
Trip Length Distribution Record
Bv Model Year Inclusion Record
REGION=1
REGION=2
CALENDAR YEAR
Average Speed
Ambient Temperature
Operating Modes (PCCN, PCHC, PCCC)
MONTH
LEV Program Parameter Record
Diesel Sales Fractions
Related MOBILE6 Commands
See FUEL RVP command.
See FUEL RVP command.
See FUEL RVP command.
MOBILE6 Default. No required user input.
See OXYGENATED FUELS command.
MOBILE6 Default. No required user input.
See DIESEL FRACTIONS command.
MOBILE6 Default. No required user input.
See FUEL PROGRAM command.
See OXYGENATED FUELS command.
MOBILE6 Default. No required user input.
See WE DA TRI LEN DI or WE EN TRI LEN DI commands.
Additional guidance is provided in Chapter 5.
See DATABASE VEHICLES command.
MOBILE6 Default. No required user input.
See ALTITUDE command.
See CALENDAR YEAR.
See SPEED VMT command. Additional guidance is provided in
Chapter 5.
See HOURLY TEMPERATURE and MTN/MAX TEMP commands.
Additional guidance is provided in Chapter 5.
See EXPAND EXHAUST, SOAK DISTRIBUTION, and STARTS
PER DAY commands. Additional guidance is provided in Chapter 5.
See SEASON and/or EVALUATION MONTH.
MOBILE6 Default. No required user input.
See DIESEL FRACTIONS command. Additional guidance is
provided in Chapter 5.
-253-
November 4, 2002
-------
Appendix C
Corresponding MOBILE6 Inputs for MOBILES Inputs
Part 6
Location
Additional Correction Factor Record
Additional Correction Factor Record
Additional Correction Factor Record
Additional Correction Factor Record
Additional Correction Factor Record
MOBILES Input
Air Conditioning User Fraction
Extra Load Fractions
Trailer Towing Fractions
Absolute Humidity Level
Dry and Wet Bulb Temperatures
Related MOBILE6 Commands
See ABSOLUTE HUMIDITY; CLOUD COVER; PEAK SUN, and
SUNRISE SUNSET commands for air conditioning effects.
This feature is not available in MOBILE6.
This feature is not available in MOBILE6.
See ABSOLUTE HUMIDITY command.
See ABSOLUTE HUMIDITY command.
-254-
November 4, 2002
-------
Appendix D
Vehicle Class Adjustment Factors
Parti
Calendar
Year
1952-
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
A
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
B
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
C
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
D
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
E
0.3387
0.3387
0.3387
0.3386
0.3384
0.3380
0.3374
0.3365
0.3352
0.3335
0.3335
0.3348
0.3357
0.3359
0.3357
0.3347
0.3334
0.3323
0.3315
0.3309
0.3307
0.3306
0.3302
0.3294
0.3284
F
0.0300
0.0300
0.0300
0.0301
0.0300
0.0300
0.0299
0.0298
0.0297
0.0296
0.0299
0.0308
0.0314
0.0320
0.0327
0.0334
0.0338
0.0341
0.0344
0.0345
0.0344
0.0343
0.0341
0.0339
0.0336
G
0.0190
0.0190
0.0190
0.0190
0.0190
0.0189
0.0189
0.0188
0.0188
0.0187
0.0185
0.0185
0.0184
0.0185
0.0186
0.0188
0.0192
0.0197
0.0204
0.0209
0.0214
0.0219
0.0223
0.0228
0.0232
H
0.0169
0.0169
0.0169
0.0169
0.0169
0.0168
0.0168
0.0167
0.0167
0.0166
0.0165
0.0163
0.0162
0.0161
0.0160
0.0161
0.0161
0.0162
0.0164
0.0166
0.0168
0.0170
0.0172
0.0175
0.0177
I
0.0538
0.0538
0.0538
0.0538
0.0538
0.0540
0.0544
0.0550
0.0560
0.0576
0.0590
0.0597
0.0605
0.0613
0.0622
0.0630
0.0636
0.0640
0.0646
0.0655
0.0661
0.0667
0.0671
0.0675
0.0682
J
0.0595
0.0595
0.0595
0.0595
0.0597
0.0603
0.0615
0.0632
0.0654
0.0682
0.0705
0.0720
0.0733
0.0746
0.0758
0.0769
0.0777
0.0783
0.0791
0.0798
0.0804
0.0809
0.0813
0.0816
0.0822
K
0.0985
0.0986
0.0987
0.0988
0.0990
0.0991
0.0990
0.0989
0.0987
0.0983
0.0976
0.0967
0.0962
0.0955
0.0950
0.0946
0.0945
0.0943
0.0940
0.0936
0.0932
0.0929
0.0929
0.0927
0.0926
L
0.3577
0.3577
0.3577
0.3576
0.3574
0.3570
0.3563
0.3554
0.3540
0.3521
0.3493
0.3461
0.3434
0.3413
0.3395
0.3382
0.3373
0.3365
0.3354
0.3340
0.3328
0.3317
0.3311
0.3305
0.3301
M
0.0178
0.0178
0.0178
0.0177
0.0177
0.0177
0.0177
0.0176
0.0176
0.0175
0.0173
0.0171
0.0170
0.0169
0.0168
0.0168
0.0167
0.0167
0.0166
0.0166
0.0165
0.0164
0.0164
0.0164
0.0164
N
0.0081
0.0081
0.0081
0.0081
0.0081
0.0081
0.0081
0.0081
0.0080
0.0080
0.0079
0.0078
0.0078
0.0078
0.0077
0.0077
0.0077
0.0077
0.0076
0.0077
0.0076
0.0076
0.0075
0.0076
0.0076
O
0.8203
0.8203
0.8203
0.8201
0.8197
0.8186
0.8166
0.8137
0.8094
0.8026
0.7874
0.7663
0.7458
0.7261
0.7074
0.6912
0.6783
0.6654
0.6504
0.6333
0.6167
0.6003
0.5863
0.5747
0.5646
P
0.1797
0.1797
0.1797
0.1799
0.1803
0.1814
0.1834
0.1863
0.1906
0.1974
0.2126
0.2337
0.2542
0.2739
0.2926
0.3088
0.3217
0.3346
0.3496
0.3667
0.3833
0.3997
0.4137
0.4253
0.4354
-255-
November 4, 2002
-------
Appendix D
Vehicle Class Adjustment Factors
Part 2
Calendar
Year
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020-
2050
A
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
0.2310
B
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
0.7690
C
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
0.6850
D
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
0.3150
E
0.3272
0.3262
0.3253
0.3246
0.3240
0.3235
0.3232
0.3228
0.3225
0.3221
0.3220
0.3218
0.3218
0.3217
0.3217
0.3216
0.3215
0.3215
0.3214
0.3215
0.3214
0.3215
0.3215
0.3216
F
0.0332
0.0329
0.0327
0.0325
0.0323
0.0321
0.0321
0.0320
0.0319
0.0317
0.0317
0.0317
0.0316
0.0316
0.0316
0.0316
0.0316
0.0316
0.0316
0.0316
0.0316
0.0316
0.0317
0.0317
G
0.0236
0.0240
0.0243
0.0246
0.0248
0.0250
0.0252
0.0254
0.0256
0.0257
0.0259
0.0260
0.0261
0.0262
0.0263
0.0265
0.0265
0.0266
0.0266
0.0266
0.0266
0.0266
0.0266
0.0266
H
0.0180
0.0182
0.0184
0.0185
0.0187
0.0189
0.0190
0.0191
0.0192
0.0193
0.0194
0.0194
0.0195
0.0196
0.0196
0.0197
0.0197
0.0198
0.0198
0.0198
0.0199
0.0199
0.0199
0.0199
I
0.0689
0.0695
0.0700
0.0704
0.0707
0.0709
0.0711
0.0714
0.0715
0.0716
0.0717
0.0718
0.0718
0.0718
0.0719
0.0718
0.0719
0.0719
0.0719
0.0719
0.0719
0.0719
0.0719
0.0719
J
0.0827
0.0831
0.0835
0.0838
0.0840
0.0842
0.0844
0.0846
0.0846
0.0847
0.0847
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
0.0848
K
0.0926
0.0926
0.0924
0.0924
0.0924
0.0924
0.0923
0.0922
0.0922
0.0923
0.0922
0.0921
0.0922
0.0921
0.0921
0.0921
0.0921
0.0921
0.0921
0.0921
0.0921
0.0920
0.0920
0.0920
L
0.3300
0.3297
0.3296
0.3294
0.3292
0.3291
0.3289
0.3288
0.3287
0.3287
0.3286
0.3286
0.3284
0.3284
0.3281
0.3281
0.3281
0.3280
0.3280
0.3279
0.3280
0.3278
0.3278
0.3278
M
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0163
0.0162
0.0162
0.0162
0.0163
0.0163
0.0162
0.0162
0.0162
0.0162
0.0162
N
0.0075
0.0076
0.0075
0.0076
0.0075
0.0075
0.0076
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
0.0076
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
0.0075
O
0.5566
0.5490
0.5418
0.5350
0.5283
0.5218
0.5165
0.5100
0.5041
0.4959
0.4944
0.4918
0.4907
0.4891
0.4897
0.4892
0.4868
0.4843
0.4831
0.4839
0.4828
0.4856
0.4844
0.4855
P
0.4434
0.4510
0.4582
0.4650
0.4717
0.4782
0.4835
0.4900
0.4959
0.5041
0.5056
0.5082
0.5093
0.5109
0.5103
0.5108
0.5132
0.5157
0.5169
0.5161
0.5172
0.5144
0.5156
0.5145
-256-
November 4, 2002
-------
Appendix E
MOBILE6 Default Diesel Sales Fractions
Model
Year
1996 and
later
1995
1994
1993
1992
1991
1990
1989
1988
1987
1986
1985
1984
1983
1982
1981
1980
1979
1978
1977
1976
1975
1974
1973
1972 and
earlier
LDV
0.0009
0.0006
0.0001
0.0003
0.0006
0.0013
0.0004
0.0004
0.0001
0.0027
0.0032
0.0097
0.0162
0.0241
0.0510
0.0706
0.0390
0.0269
0.0114
0.0093
0.0137
0.0155
0.0067
0.0067
0.0067
LDT1 or
LDT2
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0007
0.0033
0.0048
0.0120
0.0223
0.0656
0.0616
0.0439
0.0316
0.0259
0.0000
0.0187
0.1038
0.1170
0.1170
0.1170
LDT3 or
LDT4
0.0126
0.0115
0.0111
0.0145
0.0115
0.0129
0.0096
0.0083
0.0072
0.0082
0.0124
0.0135
0.0169
0.0209
0.0256
0.0013
0.0006
0.0011
0.0001
0.0000
0.0000
0.0000
0.0001
0.0001
0.0001
HDV2B
0.1998
0.2578
0.2515
0.3263
0.2784
0.2963
0.2384
0.2058
0.1756
0.1958
0.2726
0.2743
0.3004
0.2918
0.2859
0.0138
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
HDV3
0.6774
0.7715
0.7910
0.8105
0.8068
0.8280
0.8477
0.7940
0.7488
0.7789
0.7842
0.6145
0.5139
0.5032
0.4277
0.0079
0.0000
0.0000
0.0001
0.0003
0.0010
0.0028
0.0248
0.0000
0.0000
HDV4
0.8606
0.8473
0.8048
0.8331
0.7901
0.7316
0.7275
0.7158
0.5647
0.3178
0.2207
0.1968
0.1570
0.0738
0.0341
0.0414
0.0003
0.0000
0.0000
0.0000
0.0259
0.0078
0.0004
0.0090
0.0112
HDV5
0.4647
0.4384
0.3670
0.4125
0.3462
0.2771
0.2730
0.2616
0.1543
0.0615
0.0383
0.0333
0.0255
0.0111
0.0049
0.0060
0.0000
0.0000
0.0000
0.0000
0.0037
0.0011
0.0001
0.0013
0.0016
HDV6
0.6300
0.6078
0.5246
0.5767
0.5289
0.5788
0.5617
0.4537
0.4216
0.4734
0.4705
0.4525
0.4310
0.3569
0.3690
0.4413
0.3094
0.1679
0.1390
0.0808
0.0476
0.0365
0.0288
0.0274
0.0297
HDV7
0.8563
0.8443
0.7943
0.8266
0.7972
0.8279
0.8177
0.7440
0.7184
0.7588
0.7567
0.7431
0.7261
0.6602
0.6717
0.7344
0.6107
0.4140
0.3610
0.2353
0.1489
0.1170
0.0940
0.0897
0.0966
HDV8A
0.9992
0.9989
0.9987
0.9989
0.9977
0.9984
0.9982
0.9979
0.9969
0.9978
0.9980
0.9979
0.9976
0.9969
0.9978
0.9982
0.9974
0.9965
0.9964
0.9949
0.9920
0.9936
0.9819
0.9812
0.9720
HDV8B
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
1.0000
HDBS
0.9585
0.8857
0.8525
0.8795
0.9900
0.9105
0.8760
0.7710
0.7502
0.7345
0.6733
0.5155
0.3845
0.3238
0.3260
0.2639
0.0594
0.0460
0.0291
0.0240
0.0086
0.0087
0.0000
0.0000
0.0000
-257-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed
(all speeds in miles per hour)
Area Wide Average Speed
Table 1 (Part 1)
MOBILES
Area Wide
Average
Speed
o
J
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
MOBILE6
Freeway
Average
Speed
2.9
3.9
4.9
5.9
7.0
8.1
9.2
10.4
11.6
12.8
14.0
15.3
16.6
17.9
19.3
20.7
22.2
23.7
25.2
26.8
28.4
30.1
MOBILE6
Arterial/Col.
Average
Speed
2.5
o o
J.J
4.2
5.1
6.0
6.9
7.9
8.9
9.9
10.9
12.0
13.1
14.2
15.3
16.5
17.7
19.0
20.2
21.6
22.9
24.3
25.7
MOBILE6
Freeway
Lower Speed
Bin Speed
2.5
2.5
2.5
5
5
5
5
10
10
10
10
15
15
15
15
20
20
20
25
25
25
30
MOBILE6
Freeway
Lower Speed
Bin Fraction
0.743
0.293
0.022
0.684
0.427
0.234
0.083
0.890
0.595
0.349
0.141
0.925
0.616
0.346
0.107
0.825
0.509
0.224
0.950
0.599
0.278
0.978
MOBILE6
Freeway
Upper Speed
Bin Speed
5
5
5
10
10
10
10
15
15
15
15
20
20
20
20
25
25
25
30
30
30
35
MOBILE6
Freeway
Upper Speed
Bin Fraction
0.257
0.707
0.978
0.316
0.573
0.766
0.917
0.110
0.405
0.651
0.859
0.075
0.384
0.654
0.893
0.175
0.491
0.776
0.050
0.401
0.722
0.022
MOBILE6
Arterial/Col.
Lower Speed
Bin Speed
2.5
2.5
2.5
5
5
5
5
5
5
10
10
10
10
15
15
15
15
20
20
20
20
25
MOBILE6
Arterial/Col.
Lower Speed
Bin Fraction
1.000
0.512
0.196
0.970
0.669
0.443
0.267
0.127
0.012
0.748
0.504
0.296
0.115
0.914
0.635
0.387
0.165
0.942
0.640
0.366
0.116
0.831
MOBILE6
Arterial/Col.
Upper Speed
Bin Speed
5
5
5
10
10
10
10
10
10
15
15
15
15
20
20
20
20
25
25
25
25
30
MOBILE6
Arterial/Col.
Upper Speed
Bin Fraction
0.000
0.488
0.804
0.030
0.331
0.557
0.733
0.873
0.988
0.252
0.496
0.704
0.885
0.086
0.365
0.613
0.835
0.058
0.360
0.634
0.884
0.169
-258-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions from Average Speed
(all speeds in miles per hour)
Area Wide Average Speed
Table 1 (Part 2)
MOBILES
Area Wide
Average
Speed
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Greater Than
44
MOBILE6
Freeway
Average
Speed
31.8
33.6
35.4
37.3
39.3
41.3
43.4
45.5
47.8
50.1
52.5
54.9
57.5
60.2
62.9
65.8
68.8
71.9
75.1
78.5
N/A
MOBILE6
Arterial/Col
Average
Speed
27.2
28.7
30.3
31.9
33.6
35.3
37.1
38.9
40.8
42.8
44.8
47.0
49.1
51.4
53.8
56.2
58.8
61.4
64.2
67.1
N/A
MOBILE6
Freeway
Lower Speed
Bin Speed
30
30
35
35
35
40
40
45
45
50
50
50
55
60
60
60
60
60
60
60
60
MOBILE6
Freeway
Lower Speed
Bin Fraction
0.599
0.250
0.902
0.501
0.128
0.717
0.299
0.883
0.422
0.985
0.485
0.013
0.480
0.967
0.398
0.000
0.000
0.000
0.000
0.000
0.000
MOBILE6
Freeway
Upper Speed
Bin Speed
35
35
40
40
40
45
45
50
50
55
55
55
60
65
65
65
65
65
65
65
65
MOBILE6
Freeway
Upper Speed
Bin Fraction
0.401
0.750
0.098
0.499
0.872
0.283
0.701
0.117
0.578
0.015
0.515
0.987
0.520
0.033
0.602
1.000
1.000
1.000
1.000
1.000
1.000
MOBILE6
Arterial/Col.
Lower Speed
Bin Speed
25
25
30
30
30
35
35
35
40
40
40
45
45
50
50
55
55
60
60
60
60
MOBILE6
Arterial/Col.
Lower Speed
Bin Fraction
0.514
0.222
0.933
0.582
0.254
0.932
0.551
0.194
0.818
0.412
0.029
0.584
0.157
0.697
0.227
0.737
0.228
0.697
0.150
0.000
0.000
MOBILE6
Arterial/Col.
Upper Speed
Bin Speed
30
30
35
35
35
40
40
40
45
45
45
50
50
55
55
60
60
65
65
65
65
MOBILE6
Arterial/Col.
Upper Speed
Bin Fraction
0.486
0.778
0.067
0.418
0.746
0.068
0.449
0.806
0.182
0.588
0.971
0.416
0.843
0.303
0.773
0.263
0.772
0.303
0.850
1.000
1.000
-259-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed
(all speeds in miles per hour)
Freeway Average Speed
Table 2 (Part 1)
MOBILES
Freeway
Average Speed
2.5
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
MOBILE6
Freeway
Average Speed
2.3
2.8
3.7
4.7
5.6
6.5
7.5
8.5
9.4
10.4
11.4
12.3
13.3
14.3
15.3
16.3
17.3
18.3
19.3
20.3
21.3
22.3
23.4
24.4
25.4
26.5
27.5
28.6
29.7
30.7
31.8
32.9
MOBILE6
Freeway Lower
Speed Bin Speed
2.5
2.5
2.5
2.5
5
5
5
5
5
10
10
10
10
10
15
15
15
15
15
20
20
20
20
20
25
25
25
25
25
30
30
30
MOBILE6
Freeway Lower
Speed Bin
Fraction
1.000
0.799
0.346
0.074
0.786
0.528
0.334
0.183
0.062
0.889
0.642
0.433
0.254
0.099
0.925
0.686
0.472
0.282
0.110
0.925
0.689
0.475
0.278
0.097
0.894
0.662
0.446
0.245
0.058
0.835
0.605
0.389
MOBILE6
Freeway Upper
Speed Bin Speed
5
5
5
5
10
10
10
10
10
15
15
15
15
15
20
20
20
20
20
25
25
25
25
25
30
30
30
30
30
35
35
35
MOBILE6
Freeway Upper
Speed Bin
Fraction
0.000
0.201
0.654
0.926
0.214
0.472
0.666
0.817
0.938
0.111
0.358
0.567
0.746
0.901
0.075
0.314
0.528
0.718
0.890
0.075
0.311
0.525
0.722
0.903
0.106
0.338
0.554
0.755
0.942
0.165
0.395
0.611
-260-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed
(all speeds in miles per hour)
Freeway Average Speed
Table 2 (Part 2)
MOBILES
Freeway
Average Speed
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Greater Than 60
MOBILE6
Freeway
Average Speed
33.9
35.0
36.1
37.2
38.3
39.4
40.6
41.7
42.8
43.9
45.1
46.2
47.4
48.5
49.7
50.8
52.0
53.2
54.4
55.6
56.8
58.0
59.2
60.4
61.6
62.9
64.1
N/A
MOBILE6
Freeway Lower
Speed Bin Speed
30
30
35
35
35
35
40
40
40
40
45
45
45
45
45
50
50
50
50
55
55
55
55
60
60
60
60
60
MOBILE6
Freeway Lower
Speed Bin
Fraction
0.186
0.000
0.750
0.522
0.305
0.100
0.878
0.639
0.412
0.195
0.986
0.739
0.502
0.276
0.059
0.818
0.574
0.340
0.114
0.877
0.626
0.385
0.152
0.914
0.657
0.410
0.170
0.000
MOBILE6
Freeway Upper
Speed Bin Speed
35
35
40
40
40
40
45
45
45
45
50
50
50
50
50
55
55
55
55
60
60
60
60
65
65
65
65
65
MOBILE6
Freeway Upper
Speed Bin
Fraction
0.814
1.000
0.250
0.478
0.695
0.900
0.122
0.361
0.588
0.805
0.014
0.261
0.498
0.724
0.941
0.182
0.426
0.660
0.886
0.123
0.374
0.615
0.848
0.086
0.343
0.590
0.830
1.000
-261-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed
(all speeds in miles per hour)
Arterial/Collector Average Speed
Table 3 (Part 1)
MOBILES
Arterial/Col.
Average Speed
2.5
o
6
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
MOBILE6
Arterial/Col. Lower
Speed Bin Speed
2.5
2.5
2.5
2.5
5
5
5
5
5
10
10
10
10
10
15
15
15
15
15
20
20
20
20
20
25
25
25
25
25
30
30
30
MOBILE6
Arterial/Col. Lower
Speed Bin Fraction
1.000
0.667
0.250
0.000
0.667
0.429
0.250
0.111
0.000
0.727
0.500
0.308
0.143
0.000
0.750
0.529
0.333
0.158
0.000
0.762
0.545
0.348
0.167
0.000
0.769
0.556
0.357
0.172
0.000
0.774
0.563
0.364
MOBILE6
Arterial/Col. Upper
Speed Bin Speed
5
5
5
5
10
10
10
10
10
15
15
15
15
15
20
20
20
20
20
25
25
25
25
25
30
30
30
30
30
35
35
35
MOBILE6
Arterial/Col. Upper
Speed Bin Fraction
0.000
0.333
0.750
1.000
0.333
0.571
0.750
0.889
1.000
0.273
0.500
0.692
0.857
1.000
0.250
0.471
0.667
0.842
1.000
0.238
0.455
0.652
0.833
1.000
0.231
0.444
0.643
0.828
1.000
0.226
0.438
0.636
-262-
November 4, 2002
-------
Appendix F
Creating MOBILE6 Average Speed Distributions From Average Speed
(all speeds in miles per hour)
Arterial/Collector Average Speed
Table 3 (Part 2)
MOBILES
Arterial/Col.
Average Speed
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
Greater Than 65
MOBILE6
Arterial/Col. Lower
Speed Bin Speed
30
30
35
35
35
35
35
40
40
40
40
40
45
45
45
45
45
50
50
50
50
50
55
55
55
55
55
60
60
60
60
60
60
MOBILE6
Arterial/Col. Lower
Speed Bin Fraction
0.176
0.000
0.778
0.568
0.368
0.179
0.000
0.780
0.571
0.372
0.182
0.000
0.783
0.574
0.375
0.184
0.000
0.784
0.577
0.377
0.185
0.000
0.786
0.579
0.379
0.186
0.000
0.787
0.581
0.381
0.188
0.000
0.000
MOBILE6
Arterial/Col. Upper
Speed Bin Speed
35
35
40
40
40
40
40
45
45
45
45
45
50
50
50
50
50
55
55
55
55
55
60
60
60
60
60
65
65
65
65
65
65
MOBILE6
Arterial/Col. Upper
Speed Bin Fraction
0.824
1.000
0.222
0.432
0.632
0.821
1.000
0.220
0.429
0.628
0.818
1.000
0.217
0.426
0.625
0.816
1.000
0.216
0.423
0.623
0.815
1.000
0.214
0.421
0.621
0.814
1.000
0.213
0.419
0.619
0.813
1.000
1.000
-263-
November 4, 2002
------- |