United States        Air and Radiation       EPA420-P-02-016
           Environmental Protection                 November 2002
           Agency                       NR-009b
&EPA    Exhaust and Crankcase
           Emission Factors for
           Nonroad Engine Modeling
           Compression-Ignition
                                   > Printed on Recycled Paper

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                                                        EPA420-P-02-016
                                                          November 2002
     Exhaust and Crankcase Emission Factors for
 Nonroad Engine Modeling — Compression-Ignition

                             NR-009b
                     Assessment and Modeling Division
                   Office of Transportation and Air Quality
                   U.S. Environmental Protection Agency
                               NOTICE

  This technical report does not necessarily represent final EPA decisions or positions.
It is intended to present technical analysis of issues using data that are currently available.
       The purpose in the release of such reports is to facilitate the exchange of
     technical information and to inform the public of technical developments which
      may form the basis for a final EPA decision, position, or regulatory action.

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                    Exhaust and Crankcase Emission Factors
                          for Nonroad Engine Modeling--
                               Compression-Ignition

                                Report No. NR-009b
                              Revised November 27, 2002

                           Assessment and Standards Division
                      EPA, Office of Transportation and Air Quality
Purpose
       This report describes and documents exhaust emission factors used for compression
ignition (CI) engines in the U.S. Environmental Protection Agency's (EPA) draft
NONROAD2002 emission inventory model. The term "compression ignition" is synonymous
with "diesel" for the purposes of this report. Pollutants covered include hydrocarbons (HC),
carbon monoxide (CO), oxides of nitrogen (NOX), particulate matter (PM), carbon dioxide (CO2),
and sulfur dioxide (SO2), as well as brake specific fuel consumption (BSFC).  All PM emissions
are assumed to be smaller than 10 microns (PM10) and 92% of the PM is assumed to be smaller
than 2.5 microns (PM2.5). The NONROAD Reporting Utility allows the user to select which of
these two size ranges is reported.

       This report covers zero-hour, steady-state emission factors, transient adjustment factors,
and deterioration factors for all diesel-fueled engines. Adjustments to emission rates due to
variations in fuel sulfur level are also included. There are no additional adjustments to CI
emissions for temperature, altitude, or for other fuel parameters. Crankcase HC emission factors
are also covered in this report.  Emission factors for spark ignition engines (including gasoline
and natural gas/propane) are covered in a separate report, NR-010C.

       Zero-mile, steady-state emission factors for HC, CO, NOX, PM, and BSFC will be
discussed first, followed by adjustments (where applicable) to account for transient operation,
deterioration, and variations in fuel sulfur level. Derivation of CO2 and SO2 emission factors
follows. Crankcase HC emission factors are then discussed. Prior estimates were documented in
the previous version of this report and a subsequent memorandum. [1,2]

-------
Introduction

       The NONROAD model estimates air pollution from more than 80 types of compression
ignition (CI) and spark ignition (SI) nonroad sources including such items as lawnmowers,
motorboats, portable generators and construction equipment. By bringing together information
on equipment populations, equipment use, and emission factors, the NONROAD model
estimates mass emissions of hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOX),
sulfur dioxide (SO2), particulate matter (PM) and carbon dioxide (CO2) for specific states and
counties for past and future years, providing a flexible tool that can be applied to a wide variety
of air quality modeling and planning functions.

       The NONROAD calculations rely on emission factors—estimates of the amount of
pollution emitted by a particular type of equipment during a unit of use. Typically, emission
factors for nonroad sources are reported in grams per horsepower-hour (g/hp-hr), but they also
may be reported in grams per mile, grams per hour, and grams per gallon. The CI emission
factors in the NONROAD model are reported in g/hp-hr and are based on emissions test data
where available, adjusted when necessary to account for in-use operation that differs from the
typical test conditions. These emission factors are stored in NONROAD's data input files.
NONROAD adjusts these emission factors as necessary to account for the effects of fuel  sulfur.
Emission changes with the age of the engine, often called 'deterioration,'are also applied by the
model.

       If comments on this document or other information gathered during stakeholder and peer
review cause us to refine the CI emission factors, we will document the changes in a subsequent
report.

Emission Standards

       In addition to estimating emissions from uncontrolled engines, the NONROAD model is
designed to account for the effect of federal emissions standards. NONROAD will not cover
California emission standards or proposed federal standards that are not yet final. Thus, this
document describes emission factors under two regulations that establish three tiers of emission
standards:

•      "Determination of Significance for Nonroad Sources and Emission Standards for New
       Nonroad Compression Ignition Engines at or above 37 Kilowatts." This rule establishes
       "Tier 1" standards for CI engines at or above 50 hp (37 kW).  [3]

•      "Control of Emissions from Nonroad Diesel Engines."  This rule lists  "Tier 1"  and "Tier
       2" standards for CI engines below 50 hp, and "Tier 2" and "Tier 3 " standards for engines
       of 50 hp and greater. [4]

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       There is also now a final rulemaking for large spark-ignition engines (> 25hp) and
recreational engines (both marine and land-based). [5]  Since this rulemaking was just published
in November 2002, the final standards for these equipment categories are not included in this
version of the model.

       The emission standards with the affected model years are provided in Table 1.  Along
with the new engine standards, there are flexibility allowances for equipment manufacturers.
Under the Percentage Phase-in Allowance provision, a manufacturer may exempt up to a
cumulative total of eighty percent of the production over the first seven years a new standard
applies. This applies separately to each regulatory power category. The engines used in such
exempted equipment will only have to meet the previous standard, which is either the Tier 1
standard in the case of equipment at or  above 50 hp, or unregulated in the case of equipment
under 50 hp.  For categories of engines  where there is an overlap in standards (this only occurs in
equipment at or above 50 hp), the standard for the exempted equipment continues to be the Tier 1
standard.

       For the purposes of emissions modeling, we assumed that the manufacturers took full
advantage of the Percentage Phase-in Allowance provisions. The  resulting technology
distributions by hp category and model  year are provided in Appendix A, Table Al.

Methodology for Calculation of Emission Factors in NONROAD

       For HC, CO, and NOX, the exhaust emission factor for a given diesel equipment type in a
given model year/age is calculated as follows:

           EFadj(HC,CO,NOx) = EFss X TAF  X DF                [Equation 1]

where:
EFadj = final emission factor used in model, after adjustments to account for transient operation
       and deterioration (g/hp-hr)
EFSS = zero-hour, steady-state emission factor (g/hp-hr)
TAF = transient adjustment factor (unitless)
DF =  deterioration factor (unitless)

The zero-hour, steady-state emission factors (EFSS) are mainly a function of model year and
horsepower category, which defines the technology type. The transient adjustment factors
(TAFs) vary by equipment type.  The deterioration factor (DF) is a function of the technology
type and age of the engine.

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Table 1. Nonroad CI Engine Emission Standards
Engine Power
(hp)
<11
> 1 1 to <25
>25 to <50
>50to<100
>100to<175
>175to<300
>300to<600
>600 to <750
>750
Model Year
2000-2004
2005+
2000-2004
2005+
1999-2003
2004+
1998-2003
2004-2007
2008+
1997-2002
2003-2006
2007+
1996-2002
2003-2005
2006+
1996-2000
2001-2005
2006+
1996-2001
2002-2005
2006+
2000-2005
2006+
Regulation
Tierl
Tier 2
Tierl
Tier 2
Tierl
Tier 2
Tierl
Tier 2
Tier3
Tierl
Tier 2
Tier3
Tierl
Tier 2
Tier3
Tierl
Tier 2
Tier3
Tierl
Tier 2
TierS
Tierl
Tier 2
Emission Standards (g/hp-hr)
HC












1.0


1.0


1.0


1.0

NMHC+NOX
7.8
5.6
7.1
5.6
7.1
5.6

5.6
3.5

4.9
3.0

4.9
3.0

4.8
3.0

4.8
3.0

4.8
CO
6.0
6.0
4.9
4.9
4.1
4.1

3.7
3.7

3.7
3.7
8.5
2.6
2.6
8.5
2.6
2.6
8.5
2.6
2.6
8.5
2.6
NOX






6.9


6.9


6.9


6.9


6.9


6.9

PM
0.75
0.60
0.60
0.60
0.60
0.45

0.30


0.22

0.4
0.15

0.4
0.15

0.4
0.15

0.4
0.15

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       Since PM emissions are dependent on the sulfur content of the fuel the engine is burning,
the equation used for PM is slightly modified from equation [1] as follows:

            EFadj(PM) =  EFss X TAP X DF - SpMadj                 [Equation 2]

where:
SpMadj =   adjustment to PM emission factor to account for variations in fuel sulfur content
          (g/hp-hr)
PM and SO2 are the only diesel pollutants that are dependent on fuel sulfur content.

       For BSFC, there is no deterioration applied, so the equation is simplified to:

                               =  EFssX TAF                           [Equations]
       Emission factors for CO2 and SO2 are calculated based on brake-specific fuel
consumption; therefore, the model does not require CO2 or SO2 emission factor input files. The
equations for computing these emissions are discussed in detail later in this report.

       Crankcase HC emissions are simply a fraction (2%) of exhaust HC emissions.

       For ease of reference, the model inputs for EFSS, TAFs, and DFs are included with the
technology model year fractions in Appendix A.

Zero-Hour. Steady State Emission Factors (EF..V-HC. CO. N(X . PM. and BSFC

       This section describes the steady-state fuel consumption and emission factors for HC,
CO, NOX, and PM. These emission factors are listed in Table A2 in Appendix A. We have used
engine model year and horsepower as categories to group NONROAD emission factors. These
groupings are consistent with emission standards for CI engines with two minor exceptions. One
exception is that the pre-control engines have been split into two groups, pre-1988 MY engines,
and 1988 MY to Tier 1 engines.  The pre-1988  MY engines are referred to as "Base" engines and
the 1988 MY to Tier 1 engines are referred to as "Tier 0"engines.  This distinction was made
based on data indicating a difference in emission rates. The other exception is a minor difference
in the horsepower categories used in NONROAD versus those used for standard setting.  The
NONROAD horsepower categories follow the general formula, x
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       As mentioned previously, fuel sulfur levels affect PM emissions. NONROAD users can
adjust for local (episodic) fuel sulfur levels.  The adjustment is made relative to the default fuel
sulfur level in the model. NONROAD has a default diesel fuel sulfur level of 0.33 mass percent
(3300 ppm), the national average for nonroad diesel  [6], and the Tier 1 and pre-control emission
factors in NONROAD's input files are intended to be consistent with this default fuel sulfur
level. The available Tier 2 emission factors are intended to be consistent with a default fuel
sulfur level of 0.20 mass percent. Where emission tests were known to have been performed
with fuels with other sulfur contents, the test results have been adjusted, as described in
Appendix C. In addition to adjusting for local fuel sulfur levels, this version of the model allows
the user to input alternative default diesel fuel sulfur levels for Tier 2 and later  engines.  This will
be described in more detail in a later section of the report.

       Due to lack of data, the brake-specific fuel consumption (BSFC) for the 1988-and-later
pre-control (Tier 0) engines is used for all  engines, both earlier pre-control engines and later
engines subject to emissions  standards. The derivation of the BSFC values is described in
Appendix C. While it is likely that fuel  consumption varies between these categories, there is  not
sufficient data available at this time for EPA to specify alternate values.

       There is little test data available on nonroad engines. In developing the emission factors
for NONROAD, we have considered data  from various sources.  The basis for the emission
factors by model year/hp category is described below and summarized in Tables 2-5.  Compared
to previous versions of the model, this version has updated steady-state emission factor estimates
for Tier 1 and later engines.   The steady-state data were obtained using the ISO-C1 8-mode
certification test cycle.

Base (Pre-19881 Engines <50 hp:
       There are no known tests of pre-1988 CI engines of less than or equal to 50 hp. Thus,
NONROAD will use the same emission factors as for the 1988 through Tier 1 years for engines
of this  size described below.

Base (Pre-19881 Engines > 50 hp:
        For pre-1988 CI engines of greater than 50 hp, NONROAD's steady-state emission
factors are based on the emission factors used in the Nonroad Engine and Vehicle Emission
Study (NEVES) [7]. The sources of the emission factors used in NEVES are described in
Appendix B. The emission factors vary by application. However, NEVES includes an
adjustment for in-use operation.  Since NONROAD uses a different in-use adjustment factor than
NEVES (see Appendix F), the NEVES adjustment is removed to determine pre-1988 average
steady-state emissions.

       Because the testing fuel is generally unknown, we assume that the NEVES PM factors  are
appropriate for the default fuel sulfur content of 0.33 wt.% sulfur used in NONROAD.

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Table 2.  Summary of the Basis for the HC Zero-Hour Steady-State CI Emission Factors in Draft NONROAD2002
HP
>0to11
>11 to 16
>16to25
>25 to 50
>50to100
>1 00 to 175
>1 75 to 300
>300 to 600
>600 to 750
>750
HC g/hp-hr
Tier 0*
1.5
1.7
1.7
1.8
0.99
0.68
0.68
0.68
0.68
0.68
TO Basis
OFFROAD
OFFROAD
OFFROAD
OFFROAD
EF data
EF data
EF data
EF data
EF data
EF data
Tierl
0.7628
0.4380
0.4380
0.2789
0.5213
0.3384
0.3085
0.2025
0.1473
0.2861
T1 Basis
cert
cert
cert
cert
cert
cert
cert
cert
cert
cert
Tier 2**
0.5508®
0.4380
0.4380
0.2789
0.3672®
0.3384
0.3085
0.1669
0.1669
0.1669
T2 Basis***
(5) 10% default margin from 0.6 equivalent std
(since T1 EF exceeds T2 std, cannot be used)
(3) Same as T1
(since T1 EF still below 0.6 T2 equivalent std)
(3) Same as T1
(since T1 EF still below 0.6 T2 equivalent std)
(3) Same as T1
(since T1 EF still below 0.6 T2 equivalent std)
(5) 10% default margin from 0.4 equivalent std
(since T1 EF exceeds T2 std, cannot be used)
(3) Same as T1
(since T1 EF still below 0.4 T2 equivalent std)
(3) Same as T1
(since T1 EF still below 0.4 T2 equivalent std)
cert
(1 and 2) Same as the >300 to 600hp category.
Rationale:
a) All three HP categories meet same 0.3 HC eqv
std.
b) The NOx T1 EFs exceed the T2 std. To meet
NOx T2, changes are likely to increase HC.
c) EF based on actual cert data.
Tier 3**
na
na
na
na
0.1836®
0.1836®
0.1836®
0.1669
0.1669
na
T3 Basis***




(5) 10% margin
from 0.2 eqv std
(5) 10% margin
from 0.2 eqv std
(5) 10% margin
from 0.2 eqv std
(3) Same as T2
(3) Same as T2

* Tier 0 represents 1988+ MY engines for MYs prior to Tier 1. Separate EFs are also provided for Base (pre-1988 MY) engines. For <50hp engines, Base
EF = Tier 0 EF. For >50hp engines, the Base EFs vary by application, so are not provided in this table.
** The Tier 2 and Tier 3 standards are expressed as a combined NMHC + NOX standard. The NMHC assumed fractions of these combined standards are
taken from the RIA. The resulting NMHC portion of the combined standard is referred to here as the "equivalent" standard.
*** Numbers in brackets correspond to the option selected, which is briefly described here. For more details regarding the options, consult the text.
@ An adjustment of 1.02 is also applied to convert from NMHC to THC, since the standards apply to NMHC.

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Table 3.  Summary of the Basis for the CO Zero-Hour Steady-State CI Emission Factors in Draft NONROAD2002
HP
>0to11
>11 to 16
>16to25
>25 to 50
>50to100
>1 00 to 175
>1 75 to 300
>300 to 600
>600 to 750
>750
CO g/hp-hr
Tier 0*
5
5
5
5
3.49
2.7
2.7
2.7
2.7
2.7
TO Basis
OFFROAD
OFFROAD
OFFROAD
OFFROAD
EF data
EF data
EF data
EF data
EF data
EF data
Tierl
4.1127
2.1610
2.1610
1 .5323
2.3655
0.8667
0.7475
1 .3060
1 .3272
0.7642
T1 Basis
cert
cert
cert
cert
cert
cert
cert
cert
cert
cert
Tier 2
4.1127
2.1610
2.1610
1 .5323
2.3655
0.8667
0.7475
0.8425
1 .3272
0.7642
T2 Basis**
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
cert
Same as T1 (since T1 EF still below T2 std)
Same as T1 (since T1 EF still below T2 std)
TierS
na
na
na
na
2.3655
0.8667
0.7475
0.8425
1 .3272
na
T3 Basis**
Same as T1
Same as T1
Same as T1
Same as T1
Same as T1
Same as T1
Same as T1
Same as T2
Same as T1

* Tier 0 represents 1988+ MY engines for MYs prior to Tier 1. Separate EFs are also provided for Base (pre-1988 MY) engines.
For <50hp engines, Base EF = Tier 0 EF. For >50hp engines, the Base EFs vary by application, so are not provided in this table.
** The Tier 2 and Tier 3 CO emission factors are based on application of option 2, the carryover of emission factors derived from
nonroad certification data. For more detail regarding this option, consult the text.

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Table 4.  Summary of the Basis for the NOX Zero-Hour Steady-State CI Emission Factors in Draft NONROAD2002
HP
>0to11
>11 to 16
>16to25
>25 to 50
>50to100
>1 00 to 175
>1 75 to 300
>300 to 600
>600 to 750
>750
NOx g/hp-hr
Tier 0*
10
8.5
8.5
6.9
8.30
8.38
8.38
8.38
8.38
8.38
TO Basis
OFFROAD
OFFROAD
OFFROAD
OFFROAD
EF data
EF data
EF data
EF data
EF data
EF data
Tierl
5.2298
4.4399
4.4399
4.7279
5.5988
5.6523
5.5772
6.0153
5.8215
6.1525
T1 Basis
cert
cert
cert
cert
cert
cert
cert
cert
cert
cert
Tier 2**
4.3
4.4399
4.4399
4.7279
4.7
4.1
4.0
4.3351
4.1
4.1
T2 Basis***
(4) 14% hwy margin from 5.0 equivalent std
(since T1 EF exceeds T2 std, cannot be used)
(3) Same as T1
(since T1 EF still below 5.0 T2 equivalent std)
(3) Same as T1
(since T1 EF still below 5.0 T2 equivalent std)
(3) Same as T1
(since T1 EF still below 5.0 T2 equivalent std)
(5) 10% default margin from 5.2 T2 equiv std
(since T1 EF exceeds T2 std, cannot be used)
(5) 10% default margin from 4.5 T2 equiv std
(since T1 EF exceeds T2 std, cannot be used)
(4) 10.5% hwy margin from 4.5 T2 equivalent std
(since T1 EF exceeds T2 std, cannot be used)
cert (real data preferred even though margin
from 4.5 eqv T2 std <10%)
(5) 10% default margin from 4.5 T2 equiv std
(since T1 EF exceeds T2 std, cannot be used)
(5) 10% default margin from 4.5 T2 equiv std
(since T1 EF exceeds T2 std, cannot be used)
Tier 3**
na
na
na
na
3.0
2.5
2.5
2.5
2.5
na
T3 Basis***




(5)10%
margin from
3.3 eqv std
(5)10%
margin from
2.8 eqv std
(4) 10.5% hwy
margin from
2.8 eqv std
(5)10%
margin from
2.8 eqv std
(5)10%
margin from
2.8 eqv std

* Tier 0 represents 1988+ MY engines for MYs prior to Tier 1.  Separate EFs are also provided for Base (pre-1988 MY) engines. For <50hp engines, Base
EF = Tier 0 EF.  For >50hp engines, the Base EFs vary by application, so are not provided in this table.
** The Tier 2 and Tier 3 standards are expressed as a combined NMHC + NOX standard. The NOX assumed fractions of these combined standards are taken
from the RIA. The resulting NOX portion of the combined standard is referred to here as the "equivalent" standard.
*** Numbers in brackets correspond to the option selected, which is briefly described here. For more details regarding the options, consult the text. The
derivation of the highway-based compliance margins are discussed in Appendix E.

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Table 5. Summary of the Basis for the PM Zero-Hour Steady-State CI Emission Factors in Draft NONROAD2002
HP
>0to11
>11 to 16
>16to25
>25 to 50
>50to100
>1 00 to 175
>1 75 to 300
>300 to 600
>600 to 750
>750
PM g/hp-hr
Tier 0*
1
0.9
0.9
0.8
0.722
0.402
0.402
0.402
0.402
0.402
TO Basis
OFFROAD
OFFROAD
OFFROAD
OFFROAD
EF data
EF data
EF data
EF data
EF data
EF data
Tierl
0.4474
0.2665
0.2665
0.3389
0.4730
0.2799
0.2521
0.2008
0.2201
0.1934
T1 Basis
cert
cert
cert
cert


cert
cert
cert
cert
Tier 2
0.50
0.2665
0.2665
0.3389
0.24
0.18
0.1316
0.1316
0.1316
0.1316
T2 Basis**
(1) The NOx T1 EF exceeds the T2 std. To meet
NOx T2, changes are likely to increase PM. The
T2 PM EF is therefore expected to be greater
than 0.44 (T1 EF) and less than 0.60 (T2 std);
0.50 chosen as a reasonable value.
(3) Same as T1 (since T1 EF still below T2 std)
(3) Same as T1 (since T1 EF still below T2 std)
(3) Same as T1 (since T1 EF still below T2 std)
(4) 20% highway-based margin from std
(since T1 EF exceeds T2 std, cannot be used)
(4) 20% highway-based margin from std
(since T1 EF exceeds T2 std, cannot be used)

(2) T2 EF for >300 to 600hp category applied to
these hp categories. Rationale: All four hp
0.1316 based on actual certification data.

TierS
na
na
na
na
0.30
0.22
0.15
0.15
0.15
na
T3 Basis**




(1)T3std
(1)T3std
(1)T3std
(1)T3std
(1)T3std

* Tier 0 represents 1988+ MY engines for MYs prior to Tier 1. Separate EFs are also provided for Base (pre-1988 MY) engines.  For <50hp engines, Base
EF = Tier 0 EF.  For >50hp engines, the Base EFs vary by application, so are not provided in this table.
* * Numbers in brackets correspond to the option selected, which is briefly described here. For more details regarding the options, consult the text.  The
derivation of the highway-based compliance margins are discussed in Appendix E.
                                                                  10

-------
       A conversion from gram per gallon to gram per horsepower-hr was made to NEVES
emission rates for the greater than 50 horsepower engines for the diesel recreational marine
categories; inboard, outboard, and sailboat auxiliary.  Outboard and sailboat auxiliary
engines above 50 hp were converted from the NEVES gram per gallon to gram per
horsepower using the higher fuel consumption of 0.408 Ibs/hp-hr and 7.1 Ibs/gallon fuel
density because these engines are primarily less than 100 hp. The NEVES emission rate for
inboard engines was converted using the lower fuel consumption rate of 0.367 Ibs/hp-hr
because these engines are primarily above 100 horsepower.

Tier 0 O988 to Tier l\ Engines <50 hp
       For 1988-and-later pre-control engines less than or equal to 50 hp, we will use the
emission factors described in the documentation for ARB's OFF-ROAD model. [8] We
have combined the direct injection and indirect injection factors using the technology
fractions listed in the Regulatory Impact Analysis (RIA) for the emission standards. [9]
Again, because the sulfur content of fuels used in generating these emission factors is
unknown,  we have assumed that the PM emission factors are appropriate for the default fuel
sulfur level of 0.33 weight percent.

Tier 0 (1988 to Tier IX Engines >50 hp
       Recent studies have indicated that, in general, emission rates from Tier 0 engines
greater than 50 hp are lower than for Tier 0 engines less than or equal to 50 hp. For these
engines, we will use emission factors calculated from recent studies. A summary of the
emission data from these studies is provided in Appendix C.  As explained in Appendix C, a
correction for fuel sulfur content is applied.

Tier 1 Engines . all hp categories
       The NONROAD model's emission factors for Tier 1 engines are based on EPA
certification data. The certification data are described in Appendix D.

Tier 2 Engines. >300 to 600 hp
       Since EPA certification data are available for this hp category, the emission factors
are based on analysis of the certification data, as described in Appendix D.

Tier 2 Engines <300 hp and > 600 hp and  Tier 3 Engines
       Certification data are not yet available for these categories. As a result, we
developed five alternative options for calculating zero mile, steady-state emission factors for
these engines.  These options were considered in the order they are presented here.

(1)    Examine likely impacts of expected technology changes.  In this option, we consider
       offsetting changes to PM and HC with implementation of stricter emission standards
       for NOX.  This includes assigning the applicable standard as the PM emission factor
       without applying a compliance margin. The compliance margin is the percent
       difference between a standard and  average emissions at certification for engines
                                         11

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       manufactured under that standard.

(2)     Assign an emission factor from another hp category. In this option, we assume that
       an emission factor based on certification data is applicable to another hp category
       and is preferable to applying a compliance margin to the applicable nonroad
       standard.

(3)     Continue to use the Tier 1 or Tier 2 emission factors derived from the nonroad
       certification data.  In this option, we assume that manufacturers will maintain
       current emission levels, e.g., design technologies, if they appear adequate to achieve
       compliance while maintaining some margin of safety.  Under this option, we would
       assume that emission factors remain at the same levels used for Tier 1 or Tier 2
       engines.

       This option was only considered if the compliance margin (percent difference)
       between the proposed emission factor and the applicable nonroad standard was at
       least 10%.  We based this lower bound (10%) on average highway-certification
       compliance margins for NOX, assuming that it represents progressive highway
       certification experience for a "controlling  pollutant," i.e.,  a pollutant for which  the
       necessity to achieve compliance drives innovation in engine design or control
       technology.

(4)     Reduce the applicable nonroad standard by a compliance margin derived from
       certification test results for analogous highway engines. We expect that the  control
       of emissions from  nonroad engines will follow a course similar to that experienced
       for highway engines, since we believe that as standards for nonroad engines become
       more stringent, manufacturers will adopt technologies similar to those already
       introduced in highway engines. Based on this expectation, we calculated compliance
       margins using highway standards and corresponding highway certification test
       results. In this discussion, we will refer to compliance margins calculated for
       highway engines as "highway-certification compliance margins" (HCCM). The
       derivation of the HCCMs is discussed in detail in Appendix E.  An HCCM is only
       considered for use if it is greater than or equal to 10% and less than 75%.

(5)     Apply a default compliance margin of 10%.  In this option, we assume that on
       average, manufacturers will maintain a minimum compliance margin.  This margin is
       based  on average highway certification compliance margins for NOX, the pollutant
       appearing to drive measures to achieve compliance in highway diesel engines.  A
       default compliance margin was considered when the highway-based compliance
       margins were outside the acceptable range. With this option, the applicable nonroad
       standard is simply reduced by 10%.

       The Agency regulates HC and NOX under  a combined standard for all  Tier 2 and Tier
                                         12

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3 engines. Thus, in order to apply compliance margins for these pollutants, where
applicable, we split the combined standard into pollutant-specific components for HC and
NOX.  These are presented in Table 6.

       For each pollutant in Tiers 2 and 3, we evaluated one or more of these five options
for each horsepower category. The specific options selected for each pollutant and Tier are
presented in Tables 2-5 and summarized below:

HC:   Tier 2: For categories less than 300 hp, we continued to use the Tier 1 nonroad
       certification results (option 3) or applied the default compliance margin (option 5) on
       an individual basis by horsepower category to give nonroad compliance margins of
       at least 10%. We did not use the highway-certification compliance margins because
       they were unrealistically large (> 80%), and achieved in relation to highway
       standards that are several times higher than their pollutant-specific nonroad
       counterparts.

       For the two hp categories greater than 600 hp, we assigned the emission factor for
       the 300-600 hp category. The rationale, which applies options 1 and 2, is threefold:
       1) all three hp categories meet the same HC equivalent standard, 2) the  use of
       certification data is preferable to applying a compliance margin, and 3)  changes
       necessary to meet the Tier 2 NOX standard for the 600-750 hp category are likely to
       increase HC, so a slight increase in HC emissions from Tier 1 to Tier 2 for this hp
       category is not unexpected.

       Tier 3: We continued to use the Tier 2 nonroad certification results (option 3) or
       applied the default compliance margin (option 5) to give nonroad  compliance
       margins of at least 10%.  We ruled out use of highway-certification compliance
       margins (option 4) for the same reason as for Tier 2.

CO:   Tiers 2 and 3: We continued to use the Tier 1  nonroad certification results (option 2)
       for all horsepower categories in Tiers 2 and 3. Highway-certification compliance
       margins (option 4) were very large (>90%), and as with HC, give  implausibly low
       emission factors in Tiers 2 and 3.

NOX:   Tier 2: We applied highway-certification  compliance margins (option 4), continued
       to use the Tier 1 nonroad certification results (option 3) or applied the default
       compliance margin (option 5) on an individual basis by horsepower category to give
       compliance margins of at least 10%.

       Tier 3: We applied the highway certification compliance margin (option 4) or the
       default compliance margin (option 5) for  all horsepower categories.  Nonroad
       certification results (option 3) did not provide adequate compliance margins.
                                         13

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Table 6.   Tier 2 and Tier 3 Combined and Estimated Pollutant-Specific Emissions
Standards for Nonroad Diesel Engines1
Power Range
(hp)

< 11
> 1 1 to <25
>25 to <50
>50to<100
>100to<175
>175to<300
>300to<600
>600to<750
>750
Combined Standard
HC+NOX
(g/hp-hr)
Tier 2
5.6
5.6
5.6
5.6
4.9
4.9
4.8
4.8
4.8
TierS



3.5
3.0
3.0
3.0
3.0

Estimated
Pollutant-Specific
HC
(g/hp-hr)
Tier 2
0.6
0.6
0.6
0.4
0.4
0.4
0.3
0.3
0.3
Tier 3



0.2
0.2
0.2
0.2
0.2

Estimated
Pollutant-Specific
NOX
(g/hp-hr)
Tier 2
5.0
5.0
5.0
5.2
4.5
4.5
4.5
4.5
4.5
Tier 3



3.3
2.8
2.8
2.8
2.8

  1 Pollutant-specific components have no regulatory significance and are derived to facilitate
  modeling analyses.

  Basis for Pollutant-Specific HC and NOX Emission Standards:

  Tier 2 <50 hp: As in the RIA [9], EPA assumes minimum HC emissions of 0.6 g/hp-hr
  based on ARB data on indirect injection (IDI) engines under 25 hp.  This rate is then
  subtracted from the combined HC+NOX standard to split the standard into single pollutant
  emission factors.

  Tier 2 >50 hp: As in the RIA [9], the proposed European NOX standard is used to split the
  combined HC+NOX standard into single pollutant emission factors.

  Tier 3: NONROAD follows the RIA [9] in using engineering judgment to assume minimum
  HC emissions of 0.2 g/hp-hr. This rate is then subtracted from the combined HC+NOX
  standard to split the standard into single pollutant emission factors.
                                       14

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PM:   Tier 2: We applied the first four options on an individual basis by horsepower
       category to give compliance margins of at least 10%. The highway-certification
       compliance margin used for the 50-100 hp and 100-175 hp categories was 20%.

       Tier 3: Tier 3 PM emission factors were set equal to the appropriate nonroad
       standards.  To meet the NOX Tier 3 standards, technological changes are likely to
       increase PM; therefore, compliance margins were not applied to PM (option 1).

       The resulting zero-hour, steady-state emission factors for all Tiers and pollutants are
shown in Table A2 in Appendix A.

Recreational Marine and Underground Mining Emission Factors

       Recreational marine CI engines over 50 hp were recently subject to EPA emission
regulations [5], so the emission factor inputs used for these engines do not exactly follow
those presented in Tables 2-5.  Since this rulemaking was just published in November
2002, the standards for this equipment category are not included in this version of the model.
Table 7 shows the recreational marine emission factors now in draft NONROAD2002.

 Table 7.  Recreational  Marine Emission Factors (g/hp-hr)

                    THC(exh)           CO             NOx             PM

     >50hp            0.22            0.95             6.67            0.163
       Although underground mining equipment emissions are not controlled by EPA, there
have been controls imposed by the Occupational Safety and Health Administration (OSHA).
The OSHA standards do not directly follow the form used for the NONROAD model, but
they are considered approximately equivalent to the EPA Tier 2 standards for land-based CI
equipment. Therefore, the NONROAD model simply uses the NEVES uncontrolled
emission factors for Base, Tier 0, and Tier 1 underground mining inputs, and then applies
the Tier 2 emission factors from Tables 2-5 for all newer engines.

Transient Adjustment Factors-HC. CO. NO,. PM. and BSFC
                                          •xl
       Nonroad engines are primarily tested with steady-state tests. However, the steady-
state operation typically used for emission testing is not always representative of the
operation of engines in many nonroad applications.  Some of the differences can be due to
load or engine speed, and other differences can be due to transient demands. We will apply
"transient adjustment factors" ("TAFs") to the steady-state emission factors previously
described.
                                        15

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       We calculate the TAP as the ratio of the transient emission factor (EFfrOTB) to the
corresponding steady-state (ISO-C1) emission factor (EFSS):

                                           ER,
                                   j , p _  — - trans
                                            EF
                                              ss
Transient adjustment factors may be greater than or less than 1.0.

       The derivation and application of the TAFs, including the test data used, are
described in more detail in Appendix F. Appendix F also compares the TAP methodology
and data used for draft NONROAD2002 with previous versions of the model.

       Table A3 presents the resulting TAFs assigned to each equipment application.  The
steady-state emission factors given in Table A2 were then multiplied by the appropriate
TAFs to create NONROAD's emission factor input files for CI engines. If viewing the
emission factor input files, please note that these include fields for technology types
corresponding to expected/proposed regulations, but at this time the emission factors listed
there are not used and are shown as being the same as the emission factors for existing
standards (E.g., diesel T4 entries equal T3). When any final regulations are promulgated,
EPA will provide updated emission factor and  technology phase-in files that contain the
appropriate inputs.

Deterioration Factors-HC. CO. NO.,, and PM

       The NONROAD model addresses the effects of deterioration in the inventory
calculation by multiplying a zero hour emission factor for each category of engine by a
deterioration factor, DF (see equation 1 above). DF varies as a function of engine age.  The
following equation is used to calculate DF as a function of engine age:

DF =  1 + A * (Age Factor)b         for Age Factor < 1                       [Equation 4]
DF =  1 + A                        for Age Factor > 1

where: Age Factor   = fraction of median life expended = (cumulative hours * load factor)
                                                      median life at full load, in hours
       A, b          = constants for a given pollutant/technology type; b< 1.

Deterioration is capped at the end of an engine's median life (age factor =1), under the
assumption that an engine deteriorates to a point where any increased deterioration is offset
by maintenance.

       The constants A and b can be varied to approximate a wide range  of deterioration
patterns. "A" can be varied to reflect differences in maximum deterioration. For example,
                                         16

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setting A equal to 2.0 would result in emissions at the engine's median life being three times
the emissions when new (DF = 1+2). The shape of the deterioration function is determined
by the second constant, "b."  This constant can be set at any level between zero and 1.0. For
compression-ignition engines, b is always equal to 1.0. This results in a linear deterioration
pattern, in which the rate of deterioration is constant throughout the median life of an
engine.

       Due to lack of deterioration data for nonroad compression-ignition engines, the
deterioration factors are based on data derived from highway engines.  The derivation of the
constant "A" for compression-ignition engines is described in Appendix G and the resulting
deterioration factors (i.e., the constants "A") are given in Table A4.

Sulfur Adjustment for PM Emissions (SPM:tdj)

       Since PM emissions are dependent on the sulfur content of the fuel, an adjustment
(SpMadj) is subtracted from the PM emission factor to account for variations in fuel sulfur
content (see equation 2 above).  SPMadj corrects PM emissions from the default fuel sulfur
level to the episodic fuel sulfur level and is calculated using the following equation:

           j = BSFC * 453.6 * 7.0 * soxcnv * 0.01 * (soxbas - soxdsl)        [Equation 5]
       where: SPMadj = PM sulfur adjustment (g/hp-hr)
              BSFC = in-use adjusted brake-specific fuel consumption (Ib fuel/hp-hr)
              453.6 = conversion from Ib to grams
              7.0 = grams PM sulfate/grams PM sulfur
              soxcnv = grams PM sulfur/grams fuel sulfur consumed = 0.02247 for diesel
              0.01= conversion from percent to fraction
              soxbas = default fuel sulfur weight percent = 0.33 for diesel
              soxdsl = episodic fuel sulfur weight percent (specified by user)

Derivation of the soxcnv term is described in Appendix C.

       This version of the model also allows the user to input alternative default diesel fuel
sulfur levels (soxbas) for Tier 2 and Tier 3 engines. This is a feature added to the opt file,
but not available through the GUI; therefore, this feature can only be exercised by changing
the opt file.

       Note that this version of the model corrects errors in the equation to adjust diesel PM
for fuel sulfur. In previous versions, the (soxbas - soxdsl) term above was expressed as
(0.0033-soxdsl) when the proper term should have been (0.33-soxdsl), since soxdsl is in
terms of weight percent. There were also some mismatched units and the conversion from
g/hp-hr to g/hr was missing the load factor term. The net effect of making these corrections
was to lower diesel PM by roughly 30-40 percent.
                                          17

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Sample Calculation-EF adj

       The following example illustrates how emission factors are calculated in
NONROAD.
Example: Calculate the PM emission factor for a three year old 100-175 hp diesel excavator
in 2003. The episodic diesel fuel sulfur level is 2500 ppm. (In NONROAD, three year old
equipment in 2003 translates to equipment made in model year 2001, since the calendar year
of interest is assigned age =1 year).

Needed inputs:       For 100-175 hp, MY2001 = Tier 1 (from Table 1)
                     100-175 hp, Tier 1 PM EFSS = 0.2799 g/hp-hr (from Table A2)
                    Excavator, Tier 1 PM TAP = 1.23 (from Table A3)
                    Tier 1 PM Deterioration "A" = 0.473 (from Table A4)

The deterioration factor, DF, is calculated as:

 DF = 1 + Accumulative hours * load factor)                               [Equation 4]
            median life at full load, in hours

where:       Diesel excavator activity = 1092 hours/year (from activity.dat input file)
             Diesel excavator load factor = 0.59 (from activity.dat input file)
             Diesel excavator median life = 4667 hours (from us. pop input file)
             Cumulative hours = age * activity = 3*1092 = 3276 hours

Substituting the above values into the equation yields:

       DF= 1 + 0.473*(3276*0.59) = 1 + 0.473 * 0.414 = 1.196
                         4667

The sulfur adjustment factor,  SPMadj, is calculated as:

           dj = BSFC * 453.6 * 7.0 * soxcnv * 0.01 * (soxbas - soxdsl)       [Equation 5]
       where: BSFC = 100-175 hp BSFCSS * Excavator BSFC TAP = 0.367*1.01 = 0.371
             (BSFCSS from Table A2 and BSFC TAP from Table A3)
             soxcnv  = 0.02247
             soxbas  =0.3300
             soxdsl = 0.2500
                                        18

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Substituting the values into the equation yields:

           dj = 0.371* 453.6 * 7.0 * 0.02247 * 0.01 * (0.33 - 0.25) = 0.0212 g/hp-hr

The resulting adjusted emission factor is calculated as follows:

       FT.     = FT.  * TAF * TTF - S
       c/r adj(PM)   c/rss  1-tt-T   UF   '-'PMadj
               = (0.2799 * 1.23  * 1.196) - 0.0212
               = 0.39 g/hp-hr

Emission Factors—CO2 and SO2

       Emission factors for CO2 and SO2 are rarely measured, instead they typically are
calculated based on brake-specific fuel consumption (BSFC).

       The NONROAD model uses in-use adjusted BSFC to compute CO2 emissions
directly, as shown in the equation  below. The carbon that goes to exhaust HC emissions is
subtracted. This does not require a CO2 emission factors input file.

       CO, =  (BSFC * 453.6* - HC) * 0.87 * (44/12)                       [Equation 6]

       where
              CO2 is in g/hp-hr
             BSFC is the in-use  adjusted fuel consumption in Ib/hp-hr
              453.6 is the conversion factor from pounds to grams
             HC is the in-use adjusted hydrocarbon emissions in g/hp-hr
              0.87 is the carbon mass fraction ofdiesel
              44/12 is the ratio ofCO2 mass to carbon mass

       The model does not require an SO2 emission factors input file either. EPA will
calculate SO2 emission factors as shown in the equation below.

       SO2 = (BSFC * 453.6* (1  - soxcnv) - HC) * 0.01 * soxdsl * 2          [Equation 7]

       where
             SO2 is in g/hp-hr
             BSFC is the in-use  adjusted fuel consumption in Ib/hp-hr
              453.6 is the conversion factor from pounds to grams
             soxcnv is the fraction of fuel sulfur converted to direct PM
             HC is the in-use adjusted hydrocarbon emissions in g/hp-hr
              0.01 is the conversion factor from weight percent to weight fraction
             soxdsl is the episodic weight percent of sulfur in nonroad diesel fuel
             2 is the grams of SO 2 formed from a gram of sulfur
                                        19

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       This equation includes corrections for the fraction of sulfur that is converted to direct
PM and for the fraction of sulfur remaining in unburned fuel.  This equation assumes that
the unburned fuel, as indicated by HC emissions, has the same sulfur level as the base fuel.

       Note that this version of the model  corrects errors in the equation to calculate SO2
emissions. In previous versions, the conversion from g/hp-hr to g/hr was missing the load
factor term.  The net effect of making this correction was to lower SO2 by roughly 40-50
percent.

Crankcase HC Emission Factors

       Crankcase emissions are those emissions that escape from the combustion chamber
past the piston rings into the crankcase. For diesel engines with open crankcases,
NONROAD assumes the crankcase HC emission factor is equal to 2.0% of the exhaust HC
emission factor.  This estimate was obtained from NEVES [7], and is based on data from
on-highway engines.  These percentages are applied to the final calculated exhaust emission
factors, so the resulting crankcase emission factors include the same percentage deterioration
as used for exhaust HC.  Crankcase emission factors for all fuel types are discussed in NR-
012a, "Basic Evaporative Emission Rates for Nonroad Engine Modeling."
                                        20

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References

[1]  EPA, "Exhaust Emission Factors for Nonroad Engine Modeling-Compression-
Ignition," Report No. NR-009A, June 15, 1998.

[2] Wilcox, Richard. "Changes to the NONROAD Model for the April 2000 Version Used
in Support of the 2007 Heavy-Duty Diesel Engine Rule, " Memorandum to Docket A-99-06,
May 31,2000.

[3]  59 FR 31306, June 17, 1994.

[4]  63 FR 56967, October 23, 1998.

[5]  EPA, "Control of Emissions From Nonroad Large Spark-Ignition Engines and
Recreational Engines (Marine and Land-Based); Final Rule," 67 FR 68241, November 8,
2002.

[6]  Korotney, David.  "Estimates for In-Use Nonroad Diesel Fuel Levels," Memorandum to
Docket A-96-40. July 1, 1997.

[7]  EPA, "Nonroad Engine and Vehicle Emission Study" (NEVES), U.S. EPA, Office of
Air and Radiation, 21A-2001. November, 1991.

[8]  EEA, "Documentation of Input Factors for the New Off-Road Mobile Source Emissions
Inventory Model," ("Inputs...") Energy and Environmental Analysis, Inc. for California Air
Resources Board. February, 1997.

[9]  EPA, "Final Regulatory Impact Analysis: Control of Emissions from Nonroad Diesel
Engines," August, 1998.
                                       21

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             Appendix A
  CI Inputs for Draft NONROAD2002:

       Technology Distributions
Zero-Hour, Steady-State Emission Factors
     Transient Adjustment Factors
         Deterioration Factors
                 Al

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Table Al. Nonroad CI Technology Distributions by HP Category and Model Year*
Engine Power
(hp)
<25
>25 to 50
>50 to 100
>100 to 175
Model Year
Pre-1988
1988-1999
2000-2001
2002-2004
2005
2006+
Pre-1988
1988-1998
1999-2000
2001-2003
2004
2005+
Pre-1998
1988-1997
1998-2003
2004-2005
2006-2007
2008-2009
2010+
Pre-1998
1988-1996
1997-2002
2003-2004
2005-2006
2007-2008
2009+
Fraction of Population in Each Technology Type
Base**
1.000





1.000





1.000






1.000






Tier 0**

1.000
0.200
0.100
0.100


1.000
0.200
0.100
0.100


1.000






1.000





Tierl


0.800
0.900




0.800
0.900




1.000
0.200
0.100
0.100



1.000
0.200
0.100
0.100

Tier 2




0.900
1.000




0.900
1.000



0.800
0.900





0.800
0.900


Tier3

















0.900
1.000





0.900
1.000
                                  A2

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     Table Al Nonroad CI Technology Distributions by HP Category and Model Year (cont.)*
Engine Power
(hp)
>175 to 300
>300 to 600
>600 to 750
>750
Model Year
Pre-1988
1988-1995
1996-2002
2003-2004
2005
2006-2008
2009+
Pre-1988
1988-1995
1996-2000
2001-2002
2003-2005
2006
2007+
Pre-1988
1988-1995
1996-2001
2002-2003
2004-2005
2006-2007
2008+
Pre-1988
1988-1999
2000-2005
2006-2007
2008
7009+
Fraction of Population in Each Technology Type
Base**
1.000






1.000






1.000






1.000





Tier 0**

1.000






1.000






1.000






1.000




Tierl


1.000
0.200
0.100
0.100



1.000
0.200
0.100
0.100



1.000
0.200
0.100
0.100



1.000
0.300
0.200

Tier 2



0.800
0.900





0.800
0.900





0.800
0.900





0.700
0.800
1 000
Tier3





0.900
1.000





0.900
1.000





0.900
1.000






*  Used in the draft 2002 version of NONROAD. The technology fractions are contained in the
tech.dat model file. Blank cells have a technology fraction of 0.000.
 ** Base = pre-control, pre-1988 MY engines. Tier 0 = pre-control 1988+ MY engines prior to Tier
1.
                                          A3

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Table A2.  Zero-Hour, Steady-State Emission Factors for Nonroad CI Engines*
Engine
Power (hp)
>0to 11
>llto 16
>16 to 25
>25 to 50
>50 to 100
>100 to 175
Technology
Type
Base
TierO
Tierl
Tier 2
Base
TierO
Tierl
Tier 2
Base
TierO
Tierl
Tier 2
Base
TierO
Tierl
Tier 2
Base
TierO
Tierl
Tier 2
TierS
Base
TierO
Tierl
Tier 2
TierS
BSFC
(Ib/hp-hr)
0.408**
0.408**
0.408**
0.408**
0.408
0.367
Emission Factors (g/hp-hr)
HC
1.5
1.5
0.7628
0.5508
1.7
1.7
0.4380
0.4380
1.7
1.7
0.4380
0.4380
1.8
1.8
0.2789
0.2789
CO
5.0
5.0
4.1127
4.1127
5.0
5.0
2.1610
2.1610
5.0
5.0
2.1610
2.1610
5.0
5.0
1.5323
1.5323
NOX
10.0
10.0
5.2298
4.3
8.5
8.5
4.4399
4.4399
8.5
8.5
4.4399
4.4399
6.9
6.9
4.7279
4.7279
PM
1.0
1.0
0.4474
0.50
0.9
0.9
0.2665
0.2665
0.9
0.9
0.2665
0.2665
0.8
0.8
0.3389
0.3389
Vary by application, see NEVES
0.99
0.5213
0.3672
0.1836
3.49
2.3655
2.3655
2.3655
6.9
5.5988
4.7
3.0
0.722
0.4730
0.24
0.30
Vary by application, see NEVES
0.68
0.3384
0.3384
0.1836
2.70
0.8667
0.8667
0.8667
8.38
5.6523
4.1
2.5
0.402
0.2799
0.18
0.22
                                  A4

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     Table A2. Zero-Hour, Steady-State Emission Factors for Nonroad CI Engines (cont.)*
Engine
Power (hp)
>175 to 300
>300 to 600
>600 to 750
>750
Technology
Type
Base
TierO
Tierl
Tier 2
TierS
Base
TierO
Tierl
Tier 2
TierS
Base
TierO
Tierl
Tier 2
TierS
Base
TierO
Tierl
Tier 2
BSFC
(Ib/hp-hr)
0.367
0.367
0.367
0.367
Emission Factors (g/hp-hr)
HC
CO
NOX
PM
Vary by application, see NEVES
0.68
0.3085
0.3085
0.1836
2.70
0.7475
0.7475
0.7475
8.38
5.5772
4.0
2.5
0.402
0.2521
0.1316
0.15
Vary by application, see NEVES
0.68
0.2025
0.1669
0.1669
2.70
1.3060
0.8425
0.8425
8.38
6.0153
4.3351
2.5
0.402
0.2008
0.1316
0.15
Vary by application, see NEVES
0.68
0.1473
0.1669
0.1669
2.70
1.3272
1.3272
1.3272
8.38
5.8215
4.1
2.5
0.402
0.2201
0.1316
0.15
Vary by application, see NEVES
0.68
0.2861
0.1669
2.70
0.7642
0.7642
8.38
6.1525
4.1
0.402
0.1934
0.1316
*Prior to listing in NONROAD input files, these ISO-C1 emission factors are adjusted for
in-use operation as explained in Appendix F.  The emission factors in the input files are
rounded to two decimal places. These emission factors do not apply to recreational marine
CI engines over 50 hp, which are: 0.22 HC, 0.95 CO, 6.67 NOx, and 0.163 PM g/hp-hr.
Underground mining equipment inputs are just the Base (NEVES) and Tier 2 values from
this table.

**BSFC for engines <50 hp is assumed to be the same as 50-100 hp engines
                                        A5

-------
Table A3. Transient Adjustment Factors by Equipment Type for Nonroad CI Equipment
sec
Equipment Type
Cycle
TAP
Assignment

2270001000
2270001020
2270001030
2270001040
2270001050
2270001060
2270002003
2270002006
2270002009
2270002015
2270002018
2270002021
2270002024
2270002027
2270002030
2270002033
2270002036
2270002039
2270002042
2270002045
2270002048
2270002051
2270002054
2270002057
2270002060
2270002063
2270002066
2270002069
2270002072
2270002075
2270002078
2270002081
2270003010
Recreational Vehicles All
Recreational Vehicles Snowmobiles
Recreational Vehicles All Terrain Vehicles
Recreational Vehicles Minibikes
Recreational Vehicles Golf Carts
Recreational Vehicles Speciality Vehicle Carts
Construction Equipment Pavers
Construction Equipment Tampers/Rammers
Construction Equipment Plate Compactors
Construction Equipment Rollers
Construction Equipment Scrapers
Construction Equipment Paving Equipment
Construction Equipment Surfacing Equipment
Construction Equipment Signal Boards
Construction Equipment Trenchers
Construction Equipment Bore/Drill Rigs
Construction Equipment Excavators
Construction Equipment Concrete/Industrial Saws
Construction Equipment Cement & Mortar Mixers
Construction Equipment Cranes
Construction Equipment Graders
Construction Equipment Off-highway Trucks
Construction Equipment Crushing/Proc. Equipment
Construction Equipment Rough Terrain Forklifts
Construction Equipment Rubber Tire Loaders
Construction Equipment Rubber Tire Dozers
Construction Equipment
Tractors/Loaders/Backhoes
Construction Equipment Crawler Dozer
Construction Equipment Skid Steer Loaders
Construction Equipment Off-Highway Tractors
Construction Equipment Dumpers/Tenders
Construction Equipment Other Construction
Equipment
Industrial Equipment Aerial Lifts
Backhoe
None
None
None
None
Backhoe
Crawler
None
None
Crawler
Crawler
Crawler
Crawler
None
Crawler
None
Excavator
Crawler
None
None
Crawler
Crawler
None
RTLoader
RTLoader
Crawler
Backhoe
Crawler
SSLoader
Crawler
Backhoe
Crawler
Backhoe
LoLF
None
None
None
None
LoLF
HiLF
None
None
HiLF
HiLF
HiLF
HiLF
None
HiLF
None
HiLF
HiLF
None
None
HiLF
HiLF
None
HiLF
HiLF
HiLF
LoLF
HiLF
LoLF
HiLF
LoLF
HiLF
LoLF
HC
All Tiers
2.29
1.00
1.00
1.00
1.00
2.29
1.05
1.00
1.00
1.05
1.05
1.05
1.05
1.00
1.05
1.00
1.05
1.05
1.00
1.00
1.05
1.05
1.00
1.05
1.05
1.05
2.29
1.05
2.29
1.05
2.29
1.05
2.29
CO
All Tiers
2.57
1.00
1.00
1.00
1.00
2.57
1.53
1.00
1.00
1.53
1.53
1.53
1.53
1.00
1.53
1.00
1.53
1.53
1.00
1.00
1.53
1.53
1.00
1.53
1.53
1.53
2.57
1.53
2.57
1.53
2.57
1.53
2.57
NOX
Base, TO-T2
1.10
1.00
1.00
1.00
1.00
1.10
0.95
1.00
1.00
0.95
0.95
0.95
0.95
1.00
0.95
1.00
0.95
0.95
1.00
1.00
0.95
0.95
1.00
0.95
0.95
0.95
1.10
0.95
1.10
0.95
1.10
0.95
1.10
Tier 3*
1.21
1.10
1.10
1.10
1.10
1.21
1.04
1.10
1.10
1.04
1.04
1.04
1.04
1.10
1.04
1.10
1.04
1.04
1.10
1.10
1.04
1.04
1.10
1.04
1.04
1.04
1.21
1.04
1.21
1.04
1.21
1.04
1.21
PM
Base, TO-T2
1.97
1.00
1.00
1.00
1.00
1.97
1.23
1.00
1.00
1.23
1.23
1.23
1.23
1.00
1.23
1.00
1.23
1.23
1.00
1.00
1.23
1.23
1.00
1.23
1.23
1.23
1.97
1.23
1.97
1.23
1.97
1.23
1.97
Tier 3*
2.37
1.20
1.20
1.20
1.20
2.37
1.47
1.20
1.20
1.47
1.47
1.47
1.47
1.20
1.47
1.20
1.47
1.47
1.20
1.20
1.47
1.47
1.20
1.47
1.47
1.47
2.37
1.47
2.37
1.47
2.37
1.47
2.37
BSFC
All Tiers
1.18
1.00
1.00
1.00
1.00
1.18
1.01
1.00
1.00
1.01
1.01
1.01
1.01
1.00
1.01
1.00
1.01
1.01
1.00
1.00
1.01
1.01
1.00
1.01
1.01
1.01
1.18
1.01
1.18
1.01
1.18
1.01
1.18
                                                    A6

-------
Table A3. Transient Adjustment Factors by Equipment Type for Nonroad CI Equipment
sec
Equipment Type
Cycle
TAP
Assignment

2270003020
2270003030
2270003040
2270003050
2270003060
2270003070
2270004000
2270004010
227000401 1
2270004015
2270004016
2270004020
2270004021
2270004025
2270004026
2270004030
2270004031
2270004035
2270004036
2270004040
2270004041
2270004045
2270004046
2270004050
Industrial Equipment Forklifts
Industrial Equipment Sweepers/Scrubbers
Industrial Equipment Other General Industrial
Equipment
Industrial Equipment Other Material Handling
Equipment
Industrial Equipment AC\Refrigeration
Terminal Tractors
Lawn & Garden Equipment ALL
Lawn & Garden Equipment Lawn mowers
(Residential)
Lawn & Garden Equipment Lawn mowers
(Commercial)
Lawn & Garden Equipment Rotary Tillers < 6 HP
Lawn & Garden Equipment Rotary Tillers < 6 HP
(Commercial)
Lawn & Garden Equipment Chain Saws < 6 HP
Lawn & Garden Equipment Chain Saws < 6 HP
(Commercial)
Lawn & Garden Equipment Trimmers/Edgers/Brush
Cutters
Lawn & Garden Equipment Trimmers/Edgers/Brush
Cutters (Commercial)
Lawn & Garden Equipment Leafblowers/Vacuums
Lawn & Garden Equipment Leafblowers/Vacuums
(Commercial)
Lawn & Garden Equipment Snowblowers
Lawn & Garden Equipment Snowblowers
(Commercial)
Lawn & Garden Equipment Rear Engine Riding
Mowers
Lawn & Garden Equipment Rear Engine Riding
Mowers (Commercial)
Lawn & Garden Equipment Front Mowers
Lawn & Garden Equipment Front Mowers
(Commercial)
Lawn & Garden Equipment Shredders < 6 HP
RTLoader
None
None
Backhoe
None
Crawler
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
HiLF
None
None
LoLF
None
HiLF
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
HC
All Tiers
1.05
1.00
1.00
2.29
1.00
1.05
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
CO
All Tiers
1.53
1.00
1.00
2.57
1.00
1.53
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
NOX
Base, TO-T2
0.95
1.00
1.00
1.10
1.00
0.95
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Tier 3*
1.04
1.10
1.10
1.21
1.10
1.04
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
PM
Base, TO-T2
1.23
1.00
1.00
1.97
1.00
1.23
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Tier 3*
1.47
1.20
1.20
2.37
1.20
1.47
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
BSFC
All Tiers
1.01
1.00
1.00
1.18
1.00
1.01
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
                                                    A7

-------
Table A3. Transient Adjustment Factors by Equipment Type for Nonroad CI Equipment
sec
Equipment Type
Cycle
TAP
Assignment

2270004051
2270004055
2270004056
2270004060
2270004061
2270004065
2270004066
2270004071
2270004075
2270004076
2270005010
2270005015
2270005020
2270005025
2270005030
2270005035
2270005040
2270005045
2270005050
2270005055
2270005060
2270006000
2270006005
2270006010
2270006015
2270006020
2270006025
Lawn & Garden Equipment Shredders < 6 HP
(Commercial)
Lawn & Garden Equipment Lawn & Garden
Tractors
Lawn & Garden Equipment Lawn & Garden
Tractors (Commercial)
Lawn & Garden Equipment Wood Splitters
Lawn & Garden Equipment Wood Splitters
(Commercial)
Lawn & Garden Equipment Chippers/Stump
Grinders
Lawn & Garden Equipment Chippers/Stump
Grinders (Commercial)
Lawn & Garden Equipment Commercial Turf
Equipment (Commercial)
Lawn & Garden Equipment Other Lawn & Garden
Equipment
Lawn & Garden Equipment Other Lawn & Garden
Equipment (Commercial)
Farm Equipment 2-Wheel Tractors
Farm Equipment Agricultural Tractors
Farm Equipment Combines
Farm Equipment Balers
Farm Equipment Agricultural Mowers
Farm Equipment Sprayers
Farm Equipment Tillers > 6 HP
Farm Equipment Swathers
Farm Equipment Hydro Power Units
Farm Equipment Other Agricultural Equipment
Farm Equipment Irrigation Sets
Light Commercial ALL
Light Commercial Generator Sets
Light Commercial Pumps
Light Commercial Air Compressors
Light Commercial Gas Compressors
Light Commercial Welders
None
None
None
None
None
None
None
None
None
None
Ag Tractor
Ag Tractor
Ag Tractor
Ag Tractor
Ag Tractor
Ag Tractor
Ag Tractor
Ag Tractor
None
Ag Tractor
None
None
None
None
None
None
ArcWelder
None
None
None
None
None
None
None
None
None
None
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
None
HiLF
None
None
None
None
None
None
LoLF
HC
All Tiers
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.05
1.05
1.05
1.05
1.05
1.05
1.05
1.05
1.00
1.05
1.00
1.00
1.00
1.00
1.00
1.00
2.29
CO
All Tiers
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.53
1.53
1.53
1.53
1.53
1.53
1.53
1.53
1.00
1.53
1.00
1.00
1.00
1.00
1.00
1.00
2.57
NOX
Base, TO-T2
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
0.95
0.95
0.95
0.95
0.95
0.95
0.95
0.95
1.00
0.95
1.00
1.00
1.00
1.00
1.00
1.00
1.10
Tier 3*
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.04
1.04
1.04
1.04
1.04
1.04
1.04
1.04
1.10
1.04
1.10
1.10
1.10
1.10
1.10
1.10
1.21
PM
Base, TO-T2
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.23
1.23
1.23
1.23
1.23
1.23
1.23
1.23
1.00
1.23
1.00
1.00
1.00
1.00
1.00
1.00
1.97
Tier 3*
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.20
1.47
1.47
1.47
1.47
1.47
1.47
1.47
1.47
1.20
1.47
1.20
1.20
1.20
1.20
1.20
1.20
2.37
BSFC
All Tiers
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.01
1.01
1.01
1.01
1.01
1.01
1.01
1.01
1.00
1.01
1.00
1.00
1.00
1.00
1.00
1.00
1.18
                                                    A8

-------
Table A3.  Transient Adjustment Factors by Equipment Type for Nonroad CI Equipment
sec
Equipment Type
Cycle
TAP
Assignment

2270006030
2270007005
2270007010
2270007015
2270008005
2270009010
2270010010
2282020005
2282020010
2282020015
2282020025
2285002015
Light Commercial Pressure Washers
Logging Equipment Chain Saws > 6 HP
Logging Equipment Shredders > 6 HP
Logging Equipment Forest Equipment
Airport Service Equipment Airport Support
Equipment
Other Underground Mining Equipment
Other Oil Field Equipment
Recreational Pleasure Craft, Inboards
Recreational Pleasure Craft, Outboards
Recreational Pleasure Craft, Personal Water Craft
Recreational Pleasure Craft, Sailboat Aux.
Outboard
Railway Maintenance
None
RTLoader
RTLoader
RTLoader
RTLoader
Backhoe
None
None
None
None
None
Backhoe
None
HiLF
HiLF
HiLF
HiLF
LoLF
None
None
None
None
None
LoLF
HC
All Tiers
1.00
1.05
1.05
1.05
1.05
2.29
1.00
1.00
1.00
1.00
1.00
2.29
CO
All Tiers
1.00
1.53
1.53
1.53
1.53
2.57
1.00
1.00
1.00
1.00
1.00
2.57
NOX
Base, TO-T2
1.00
0.95
0.95
0.95
0.95
1.10
1.00
1.00
1.00
1.00
1.00
1.10
Tier 3*
1.10
1.04
1.04
1.04
1.04
1.21
1.10
1.10
1.10
1.10
1.10
1.21
PM
Base, TO-T2
1.00
1.23
1.23
1.23
1.23
1.97
1.00
1.00
1.00
1.00
1.00
1.97
Tier 3*
1.20
1.47
1.47
1.47
1.47
2.37
1.20
1.20
1.20
1.20
1.20
2.37
BSFC
All Tiers
1.00
1.01
1.01
1.01
1.01
1.18
1.00
1.00
1.00
1.00
1.00
1.18
* The NOX and PM Tier 3 adjustment factors were incorrectly applied to steady-state equipment types (i.e., those with cycle assignments of "None."). This
will be corrected in the next version of the model.
                                                               A9

-------
 Table A4. Deterioration Factors for Nonroad Diesel Engines
Pollutant
HC
CO
NOX
PM
Relative Deterioration Factor (A)
(% increase/%useful life)
Base/Tier 0
0.047
0.185
0.024
0.473
Tier 1
0.036
0.101
0.024
0.473
Tier 2
0.034
0.101
0.009
0.473
Tier3
0.027
0.151
0.008
0.473
DF =l+A*(fraction of useful life expended)8
B = 1 for diesel nonroad engines
                                      A10

-------
                                   Appendix B
                     Sources of Previous Emission Factors for
                      Nonroad Compression Ignition Engines

       There is little test data available on nonroad engines. Table Bl lists the data sources
used for EPA's Nonroad Engine and Vehicle Study's (NEVES) diesel emission factors.
Published in November, 1991, NEVES was mandated by Congress to determine whether
nonroad sources made a significant contribution to urban air pollution. It covers HC, CO,
NOX, PM, SOX and other pollutants. It provides inventories for 19 ozone and 16 CO
nonattainment areas.

Table B1. Data sources for NEVES Diesel Emission Factors
Application
Lawn and Garden and
Light Commercial



Agriculture
Construction



Logging (skidders)
Industrial and
Airport Service Equipment
Recreational Marine
(Inboard)
Emissions Test
Data Source
None




Cal/ERT, 1982
EMA
SwRI, 1973
Cal/ERT, 1982


EMA
SwRI, 1973
NMMA

Notes
NEVES emission factors
were based on factors for
"continuous service diesel <
50 hp" SwRI, 1991, which
are based on Radian, 1988
factors for truck/container
refrigeration units.

NEVES emission factors
were based on EMA when
possible. For PM and for
applications not available
from EMA, factors were
taken from AP-42, which
relies on Cal/ERT for most
emission factors and on
SwRI, 1973 for PM and
SOx.




                                       Bl

-------
       Table B2 lists the data sources used for California's Air Resources Board (ARB)
OFFROAD diesel emission factors.  OFFROAD is designed to estimate nonroad emissions
for the state of California only. A version of this model was released in late summer 1997.  It
covers HC, CO, NOX, PM, SO2, and CO2. The studies listed in the tables are described
below.
Table B2.  Data sources for ARB OFFROAD Diesel Emission Factors
 Horsepower Class
Emissions Test
Data Source
Notes
 0-15 hp
Manufacturers' data-
2 Yanmar engines
1 Deutz engine
 15-25hp
Manufacturers (ARB Off-
Road Equipment Study,
1990)
 25-50 hp
Manufacturers Submissions
(ARB Off-Road Equipment
Study, 1990)
 50-125 hp
Manufacturers (CA HD
Construction Study, 1988)
 125-250
 250+
Manufacturers (CA HD
Construction Study, 1988)
ARB factors on all engines
from 125 hp and above are
based on the same data, but
the weighting between turbo-
charged and naturally
aspirated engines is different
in the two horsepower
categories listed here.	
Description and Citations of Sources used for Previous Emission Factors

       Radian, 1988. Radian's estimates of HC, CO, NOX and PM for truck/container
       refrigeration units are not based on testing, but on Radian's estimates for "typical
       small direct injection and indirect injection diesel engines." (Weaver, C.S.,
       "Feasibility and Cost Effectiveness of Controlling Emissions from Diesel Engines in
       Rail, Marine, Construction, Farm and Other Mobile Off-Highway Equipment."
       Final Report by Radian Corporation for U.S. EPA, Office of Policy Analysis, under
       contract 68-01-7288, February, 1988.)
                                           B2

-------
SwRI, 1973. Southwest Research Institute tested 8 diesel engines for HC, CO, NOX
and PM.  Emissions of SOx were calculated for no. 2 diesel fuel assuming sulfur
content of 0.22%.  BSFC is not stated.  The emissions tests were given different
weightings to estimate industrial, construction and farm equipment emission factors.
(Hare,  C.T and K. J. Springer. Exhaust Emission from Uncontrolled Vehicles and
Related Equipment Using Internal Combustion Engines, Final Report, Part 5, Heavy
Duty Farm, Construction and Agricultural Engines.  San Antonio TX: Southwest
Research Institute, October 1973.)

EMA. Emission factors for 17 applications based on unknown number of tests,
unknown horsepower engines.  Engine vintage unknown, but data was  submitted by
the Engine Manufacturers Association to EPA prior to NEVES (1991). (Listed in
NEVES table 1-06.)

Cal/ERT, 1982. Data from 13 engine manufacturers representing 391 models of
construction equipment.  Raw data was aggregated by an accounting firm prior to
analysis and reporting. (Environmental Research and Technology, Inc.  "Feasibility,
Cost and Air Quality Impact of Potential Emission Control Requirements on Farm,
Construction and Industrial Equipment in California", Document PA841, sponsored
by the Farm and Industrial Equipment Institute, Engine Manufacturers Association,
and Construction Industry Manufacturers Association, May 1982.)

NMMA. The National Marine Manufacturers Association submitted data to EPA on
HC, CO, NOX and BSFC for 3 diesel inboard motors. Engine vintage unknown, but
data was submitted to EPA prior to NEVES (1991). (NEVES, Table 1-1 l(e).)

ARE Off-Road Study,  1990. A study of lawn and garden and utility emissions.
(Manufacturer Submissions to ARE on Exhaust Emission Standards for Utility and
Lawn and Garden Equipment Engines. California ARB, October 1990. EPA
requests assistance in locating this study)

ARB Heavy Duty Construction Study, 1988.1 Reports HC, NOX and PM emission
factors based on emission information from four manufacturers. Does not include
information on test programs. It is not clear how data collected in the study was used
to create the inputs for the ARB model. (Energy and Environment Analysis, Inc. "
Feasibility of Controlling Emissions from Off-Road, Heavy-Duty Construction
Equipment." Final Report to the California Air Resources Board.  Arlington, VA,
December 1988.)
                                 B3

-------
                                   Appendix C
          1988-1995 (Tier 0) Zero-Hour, Steady-State Emission Factors and
         Fuel Sulfur Adjustment for Nonroad Compression Ignition Engines
Introduction

       EPA's 1991 Nonroad Engine and Vehicle Emission Study (NEVES) (1) used
emission factors for diesel engines based primarily on tests of older engines.  All the
NEVES paniculate matter (PM) emission factors are from tests conducted in 1972 and many
of the other emissions factors in NEVES are based on data from tests prior to 1982.

       To better characterize emissions from more recent, pre-control engines, EPA
analyzed available emission test data on 1988-1995 nonroad diesel engines. This analysis
provides the basis for NONROAD pre-control emission factors for 1988-and-later engines
greater than 50 hp, as described in the main body of this report. The analysis indicated a
significant difference in emissions based on engine power.  Engines between 50 and 100
horsepower in general had higher emissions and fuel  consumption than engines larger than
100 horsepower. Table Cl summarizes these results.

Table Cl.  Average Emission Test Results for 1988 to 1995 Model Year Engines
Engine
(Reference)
Average (50
to lOOhp)
Average
(>=100hp)
HC
(g/hp-hr)
0.99
0.68
CO
(g/hp-hr)
3.49
2.70
NOX
(g/hp-hr)
8.30
8.38
PM
(g/hp-hr)
0.722
0.402
BSFC
(Ib/hp-hr)
0.408
0.367
       A summary of test results for individual engines is presented in Table C2.  Note
that testing was conducted using the current certification test procedure, also known as ISO-
Cl. The procedure uses eight steady-state modes weighted by time to produce one number
in units such as grams per horsepower-hour. EPA adjusted this test data to account for
differences between the test fuel and typical in-use fuel sulfur levels of 0.33 wt. percent as
explained below.
                                        Cl

-------
Table C2. Summary of ISO-C1 Emission Results for 1988 through 1995 Engines
Engine
(Reference)
Ford New
Holland (2)
John Deere
7068T (2)
Volvo TD
71G(avg. of
2) (3)
Volvo TD73
KBE (avg. of
2) (3)
Weterbeke
32BEDA (4)
Caterpillar
3176B(4)
Cummins
KTA19-M3
(4)
Caterpillar
3306
(Nonroad) (5)
Cummins
4BT
(Nonroad) (5)
John Deere
403 9D (6)
Caterpillar
3116(7)
Caterpillar
3054 (7)
John Deere
4039 (7)
John Deere
7076 (7)
Model
Year
1991
1990
1984
1992
1995
1995
1995
1990
1990
1991
1991
1991
1994
1993
Age
(Hrs)
0
0
0
0
0
0
0
0
0
0
2,511
1,964
2,265
3,300
Fuel
Sulfur
(wt. %)
0.26
0.26
0.046
0.046
0.033
0.033
0.033
0.26
0.26
0.25
0.28
0.035
0.28
0.035
0.28
0.035
0.28
0.035
Power
Level
(hp)
127
139
144
139
95
451
599
285
100
72
201
85
86
174
HC
(g/hp-hr)
1.02
0.45
0.47
0.64
1.95
0.09
0.68
1.1
0.8
0.6
0.07
0.66
0.41
0.53
CO
(g/hp-hr)
7.70
2.98
1.64
0.85
7.43
2.94
3.26
1.4
2.1
3.5
2.51
1.00
2.17
2.05
NOX
(g/hp-hr)
7.48
11.74
12.68
4.52
7.99
6.37
8.78
6.5
11
7.2
9.38
7.53
11.22
10.22
PM
(g/hp-hr)
1.10
0.41
0.149
0.12
1.50
0.213
0.257
0.18
0.39
0.59
0.406
0.350
0.387
0.340
0.384
0.256
0.250
0.205
BSFC
(Ib/hp-hr)
0.358
0.349
0.373
0.386
0.484
0.358
0.359
0.354
0.365
0.385
0.352
0.393
0.389
0.385
                                     C2

-------
(table continued from previous page)
Engine
(Reference)
Consolidated
Diesel
6TA-830 (7)
John Deere
6619 (7)
Consolidated
Diesel 4039
(7)
Caterpillar
3306 (7)
Average
(50 to 100
hp)
Average
(>=100 hp)
Model
Year
1990
1993
1988
1990


Age
(Hrs)
4,370
4,970
3,570
6,700


Fuel
Sulfur
(wt. %)
0.28
0.035
0.28
0.035
0.28
0.035
0.28
0.035
0.33
0.33
Power
Level
(hp)
226
275
71
278


HC
(g/hp-hr)
0.86
0.82
1.32
1.27
0.99
0.68
CO
(g/hp-hr)
1.50
4.69
3.37
1.46
3.49
2.70
NOX
(g/hp-hr)
6.53
7.29
7.57
6.52
8.30
8.38
PM
(g/hp-hr)
0.397
0.338
0.662
0.556
0.581
0.484
0.248
0.245
0.722*
0.402*
BSFC
(Ib/hp-hr)
0.365
0.397
0.389
0.373
0.408
0.367
* Adjusted to the national average fuel sulfur level of 0.33 weight percent

Fuel Sulfur Adjustment

       PM emissions from diesel engines are highly dependent on the sulfur content of the
fuel the engine is burning. PM emissions from diesel engines are generally comprised of
unburned or partially burned fuel, engine oil, and sulfur compounds. When the engine burns
fuel, the fuel sulfur is oxidized to both sulfur dioxide and sulfur trioxide. The sulfur trioxide
rapidly absorbs water to form hydrated sulfuric acid which condenses and is collected on
filters as particulate matter (PM) during emission testing.

       Because the sulfur content of diesel fuel can vary considerably, it is important to
account for fuel sulfur in establishing emission factors for PM.  To adjust emission test data
to the default sulfur level used in NONROAD (0.33 wt. percent), EPA followed the
approach described below.

        EPA measured particulate emissions from nine nonroad diesel engines using fuel
with two different sulfur levels, a typical highway diesel fuel at a sulfur level of 0.035
weight percent and a typical nonroad diesel fuel doped to a sulfur level of 0.28 weight
percent to simulate more closely the average nonroad diesel fuel sulfur level of 0.33 weight
percent. (8) Data from eight of the engines is listed in Table C2, above.   In addition, the
                                         C3

-------
study included a 1997 John Deere nonroad engine.  This engine is not shown in Table C2
because it is certified for the Tier 1 emission regulations and should not be used to
determine an overall emission factor for pre-control engines. Test results from this study
(including all 9 engines tested) were used to determine the emission adjustment associated
with fuel sulfur level.  Other fuel parameter differences such as cetane and fuel  distillation
that might also have affected paniculate emissions were ignored for this analysis.

       The study found that emissions of all pollutants were reduced by using highway fuel
as compared to the nonroad fuel; however, only the average PM reduction was statistically
significant at the 90% confidence level.

       The particulate sulfur emission rate should be proportional to the fuel consumption
and the fuel sulfur level. By dividing the difference in particulate emissions by the
difference in fuel sulfur consumption,  EPA calculated the average effect of fuel sulfur levels
on PM emissions for the nine engines, as shown in Table C3 below.

Table C3. Effects of Fuel  Sulfur on PM Emissions
Engine
Cat 3 116
Cat 3 116
Cat 3054
Cat 3054
Deere 4039
Deere 4039
Deere 7076
Deere 7076
ConDsl 6TA-830
ConDsl 6TA-830
Deere 6619
Deere 6619
ConDsl 403 9
ConDsl 403 9
Cat 3306
Cat 3306
Deere 6101
Deere 6101
MY
1991
1991
1991
1991
1994
1994
1993
1993
1990
1990
1993
1993
1988
1988
1990
1990
1997
1997
Fuel Sulfur
(wt percent)
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
0.280
0.035
PM
(g/hp-hr)
0.406
0.350
0.387
0.340
0.384
0.256
0.250
0.205
0.397
0.338
0.662
0.556
0.581
0.484
0.248
0.245
0.186
0.129
BSFC
(Ib/hp-hr)
0.352
0.352
0.393
0.393
0.389
0.389
0.385
0.385
0.365
0.365
0.397
0.397
0.389
0.389
0.373
0.373
0.350
0.350
Delta
PM
(g/hp-hr)
0.056
0.047
0.128
0.045
0.059
0.106
0.097
0.003
0.057
Delta Fuel
Sulfur
Consumed*
(g/hp-hr)
0.391
0.437
0.432
0.428
0.405
0.441
0.432
0.415
0.389
Delta PM
/ Delta
Sulfur
0.143
0.107
0.296
0.105
0.146
0.240
0.225
0.007
0.147
Average- 0.1573
* Delta fuel sulfur consumed (g S/hp-hr) = 0.01*(0.280-0.035)*BSFC*453.6 g/lb
                                          C4

-------
       The value of 0.1573 is the average change in PM emissions per change in grams of
fuel sulfur consumed. The change in PM emissions would be due to PM sulfate, so this can
also be expressed as the change in PM sulfate emissions per change in grams of fuel sulfur
consumed.  We assume that PM sulfate is H2SO4:7H20 (sulfuric acid hydrated seven
times). For PM sulfate, there is 7.0 grams sulfate per gram sulfur.  Therefore, 0.1573 ^7 =
0.02247 grams PM sulfur per gram  fuel sulfur consumed, which is the fraction of fuel sulfur
converted to PM. In the NONROAD model, the change in PM emissions per change in
grams of fuel sulfur consumed is expressed as the term, "soxcnv * 7," where soxcnv is the
fraction of fuel sulfur converted to PM and 7 is the grams sulfate PM per gram sulfur.
Soxcnv is equal to 0.02247 and soxcnv * 7 is equal to 0.157 for diesel equipment.

       This analysis provided the constant "A" in the equation below, which describes the
adjustment made to correct PM emissions from the test fuel sulfur level to the default sulfur
level of 0.33 weight percent.

       PMBase = PM + BSFC * A * (0.0033 - Fuel Sulfur)

       where
             PMBase = PM emissions with default fuel,  in g/hp-hr
             PM = PM emissions with test fuel, in g/hp-hr
             BSFC = Brake Specific Fuel Consumption in g/hp-hr
             A = 0.1'57g PM/hp-hr/Weight Fraction sulfur/BSFC
             0.0033= the default weight fraction of fuel sulfur for nonroad diesel
             Fuel Sulfur = Weight Fraction of sulfur in test fuel

       EPA then used this equation for all tests listed in Table C2 to correct PM emissions
from the test-fuel sulfur level to a fuel  sulfur level of 0.33 wt.% before computing the
averages listed in Table Cl and at the bottom of Table C2.

References

(l)"Nonroad Engine and Vehicle Emission Study" (NEVES),  U.S. EPA, Office of Air and
Radiation, 21A-2001. November, 1991.

(2) Doorlag, M. andM. Samulski.  "Heavy-Duty Engine Testing Report: Non-Road Engine
Configurations, Test Results 1991"  EPA Technical Report, 1991.

(3) Hedbom, A. "Emission tests  of two Volvo//VME Heavy Duty Off Road Engines."
Motortestcenter, Hanige, Sweden. MTC 9307A. March. 1994.

(4) Carroll, J.N. and C. M. Urban.  "Emission Testing of Nonroad Compression Ignition
Engines." Draft Final Report.  Southwest Research Institute, 6886-802. September 1995.
                                        C5

-------
(5)  Fritz, S. G., "Dynamometer Testing of Heavy-Duty Diesel Engines to Support
Non-Road Regulations," SwRI Report No. 08-3426-010, Work Assignment 0-10 of
EPA Contract No. 68-CO-0014 (September 1991).

(6)  Smith, Michael. "Dynamometer Testing of Nonroad Diesel Engines to Support Nonroad
Regulations." Southwest Research Institute, 08-4855-150, EPA Docket A-91-24, June
1992.

(7) Fritz, S. G. and M.E. Starr, "Emission Factors for Compression Ignition Nonroad
Engines Operated on Number 2 Highway and Nonroad Diesel Fuel," Southwest Research
Institute.  EPA contract # 68-C5-0077,  SwRI 08-7601-822,  March 1998.

(8) Korotney, David. "Estimates for In-Use Nonroad Diesel Fuel Levels," Memorandum to
Docket A-96-40. July 1, 1997.
                                       C6

-------
                                    Appendix D
            Certification Data for Nonroad Compression Ignition Engines

       Certification data were available and therefore used to develop zero-mile, steady-
state emission factors for Tier 1 engines in all hp categories and Tier 2 engines in the >300
to 600 hp category.  Certification data were extracted from the database as of October, 2001.
Official test results (OTR values) obtained with the nonroad 8-mode test procedure were
used.

       Tests were conducted with fuel meeting either diesel nonroad or diesel on-highway
specifications. For tests conducted on the Tier 1 engines with diesel on-highway fuel, the
PM emissions were adjusted from 350 ppm to 3300 ppm sulfur (the default diesel sulfur
level used in NONROAD), using the equation described in Appendix C. For tests
conducted on the Tier 2 engines with diesel on-highway fuel, the PM emissions were
adjusted from 350 ppm to 2000 ppm.  An estimate of brake-specific fuel consumption is
required to calculate the adjustment.  If the fuel rate for a certification test was reported, the
engine-specific BSFC was calculated and used directly. If the fuel rate was not reported, the
default BSFC values in NONROAD were used to calculate the adjustment.

       The certification data were grouped by model year and by hp category. Sales-
weighted emission averages were calculated for each model year/hp category.  Then, for
each hp category, a straight average of the applicable model year data were used.

       For categories less than 50 hp, the Tier 1 standard for HC and NOX is expressed as a
combination of HC and NOX (HC+NOX, refer to Table  1). As a result, most of the
certification data for these engines is provided as the sum of HC and NOX, although there are
some data reported for HC and NOX separately. To obtain separate HC and NOX emission
factors for categories less than 50 hp, HC fractions of HC+NOX emissions were calculated
for those tests which reported both HC and HC+NOX emission factors. The average HC
fraction was then calculated and multiplied by the sales-weighted average HC+NOX
emission factor to obtain an HC emission factor (referred to as HC calc in the tables). The
remaining fraction of the HC+NOX emission factor was assigned as the NOX emission factor
(referred to as NOX calc in the tables). This was done for each model year and for each of
the hp categories less than 50 hp (i.e.,  0-11 hp, 11-25 hp, 25-50 hp).

       Table Dl presents a summary of the results, as well as the sample sizes for each
pollutant/model year/hp category. Tables D2-D7 present the individual engine emissions
data and sales weightings for each model year and hp category.  The engine identification
and specific sales information have been removed.  For categories less than 50 hp,  the HC
fractions, HC calc emission factors, and NOX calc emission factors are also provided.
                                        Dl

-------
Table D1.  Summary of Certification Data for Nonroad Compression Ignition Engines*
>0to11 hp




g/hp-hr
2000
2001
average
sample size



>11




2000
2001
total
to 25 hp
g/hp-hr
2000
2001
average
sample size



>25





2000
2001
total
to 50 hp
g/hp-hr
1999
2000
2001
average
sample size




1999
2000
2001
total
HC
0.692103
0.828378
0.760241
HC
4
5
9

HC
0.489983
0.447831
0.468907
HC
9
16
25

HC
0.496458
0.452946
0.472917
0.474107
HC
11
14
25
50
NOx
5.170337
5.073763
5.12205
NOx
6
5
11

NOx
3.749647
4.109521
3.929584
NOx
10
16
26

NOx
4.558405
4.893606
4.469647
4.640553
NOx
15
22
35
72
HC+NOx
5.966223
6.018891
5.992557
HC+NOx
20
19
39

HC+NOx
4.9489
4.80692
4.87791
HC+NOx
40
43
83

HC+NOx
4.983359
5.083919
4.952901
5.006726
HC+NOx
72
95
103
270
CO
4.051366
4.174066
4.1127
CO
20
19
39

CO
2.207041
2.114884
2.1610
CO
39
43
82

CO
1.54213
1 .522782
1 .532028
1.5323
CO
72
96
104
272
PM HC frac
0.452858 0.113196
0.44201 0.141247
0.4474
PM
20
19
39

PM HC frac
0.289982 0.081156
0.242992 0.09869
0.2665
PM
40
43
83

PM HC frac
0.35614 0.047095
0.331337 0.056039
0.329222 0.064006
0.3389
PM
72
96
104
272
HC calc
0.675351
0.850153
0.7628





HC calc
0.401631
0.474395
0.4380





HC calc
0.23469
0.284899
0.317014
0.2789





NOx calc
5.290871
5.168738
5.2298





NOx calc
4.547269
4.332525
4.4399





NOx calc
4.748669
4.79902
4.635887
4.7279





                                     D2

-------
Table Dl. Summary of Certification Data for Nonroad Compression Ignition Engines
(cont)*
>50 to 100 hp
g/hp-hr
1998
1999
2000
2001
average
sample size
1998
1999
2000
2001
total
>100to175hp
g/hp-hr
1997
1998
1999
2000
2001
average
sample size
1997
1998
1999
2000
2001
total
>175to300hp
g/hp-hr
1996
1997
1998
1999
2000
2001
average
sample size
1996
1997
1998
1999
2000
2001
total

HC
0.528845
0.517642
0.46289
0.575867
0.5213
HC
18
27
35
40
120

HC
0.297479
0.355336
0.35159
0.33246
0.355107
0.3384
HC
29
25
25
27
34
140

HC
0.331633
0.307044
0.316321
0.314974
0.26631
0.314765
0.3085
HC
44
43
72
71
64
86
380

NOx
5.682411
5.613376
5.494892
5.604515
5.5988
NOx
71
91
104
127
393

NOx
5.599201
5.743938
5.749792
5.593736
5.574714
5.6523
NOx
43
52
59
61
69
284

NOx
5.667602
5.723983
5.574079
5.549376
5.441729
5.506545
5.5772
NOx
44
43
72
71
64
86
380

HC+NOx
4.235576
6.569501
4.235576
5.976957
5.254402
HC+NOx
1
3
1
3
8

HC+NOx






HC+NOx
0
0
0
0
0
0

HC+NOx




4.54
4.203295
4.371648
HC+NOx
0
0
0
0
2
6
8

CO
2.753546
2.34687
2.047055
2.314372
2.3655
CO
21
33
38
47
139

CO
0.745072
0.961288
0.93731
0.68581
1 .003922
0.8667
CO
29
27
27
29
37
149

CO
0.834876
0.819777
0.722968
0.695869
0.666725
0.744633
0.7475
CO
44
43
72
71
64
88
382

PM
0.472055
0.452553
0.460428
0.506824
0.4730
PM
19
31
36
43
129

PM
0.281314
0.276378
0.270345
0.282059
0.28934
0.2799
PM
25
24
25
28
36
138

PM
0.239994
0.24542
0.262486
0.257528
0.240685
0.266622
0.2521
PM
44
43
72
71
64
88
382
                                      D3

-------
Table D1.  Summary of Certification Data for Nonroad Compression Ignition Engines
(cont)*
>300 to 600 hp
g/hp-hr
1996
1997
1998
1999
2000
average
2001 Tier 2
sample size
1996
1997
1998
1999
2000
2001
total
>600 to 750 hp
g/hp-hr
1996
1997
1998
1999
2000
2001
average
sample size
1996
1997
1998
1999
2000
2001
total

HC
0.260521
0.1553
0.209071
0.201521
0.186024
0.2025
0.1669
HC
40
35
48
55
51
14
243

HC
0.174804
0.135125
0.190719
0.118392
0.126821
0.138065
0.1473
HC
11
10
12
13
15
16
77

NOx
6.264393
5.865363
6.126551
6.04976
5.77026
6.0153
4.3351
NOx
40
35
48
55
51
14
243

NOx
6.063537
5.872338
5.866023
5.723896
5.790567
5.612418
5.8215
NOx
11
10
12
13
15
16
77

HC+NOx




5.24
5.24
4.345348
HC+NOx
0
0
0
0
1
35
36

HC+NOx





3.975047
3.975047
HC+NOx
0
0
0
0
0
3
3

CO
1.353145
1.431343
1 .289223
1.201752
1 .254546
1.3060
0.8425
CO
40
35
48
55
51
35
264

CO
1.502117
1.571034
1 .277422
1.361031
1.368105
0.883305
1.3272
CO
11
10
12
13
15
17
78

PM
0.195978
0.213156
0.198893
0.192703
0.203148
0.2008
0.1316
PM
40
35
48
55
51
35
264

PM
0.242149
0.236991
0.205116
0.227162
0.225632
0.183773
0.2201
PM
11
10
12
13
15
17
78
                                       D4

-------
Table D1. Summary of Certification Data for Nonroad Compression Ignition Engines
(cont)*
>750 Up
g/hp-hr
2000
2001
average
sample size
2000
2001
tntal

HC
0.25906
0.313093
0.2861
HC
16
18
34

NOx
6.252638
6.052394
6.1525
NOx
16
18
34

HC+NOx



HC+NOx
0
0
n

CO
0.727419
0.800887
0.7642
CO
16
18
34

PM
0.183308
0.203589
0.1934
PM
16
18
34
* Values in bold are used in NONROAD.  All are Tier 1 emission factors, with the
exception that both Tier 1 and Tier 2 emission factors are provided for the >300 to 600 hp
category.
                                        D5

-------
Table D2. 1996 MY Certification Data
175 to 300 hp
Rated HP
261
248
215
260
240
260
225
275
258
275
220
200
215
260
240
255
296
196
287
263
275
216
293
261
194
280
241
193
215
240
189
252
273
248
275
210
225
228
182
207
188
235
201
255
Sales-wgt EF
Sample Size

HC
0.47
0.34
0.32
0.44
0.29
0.37
0.41
0.11
0.05
0.08
0.11
0.26
0.32
0.44
0.29
0.46
0.31
0.28
0.33
0.43
0.46
0.59
0.09
0.30
0.30
0.25
0.41
0.60
0.32
0.29
0.31
0.22
0.31
0.34
0.10
0.16
0.11
0.36
0.42
0.44
0.37
0.31
0.42
0.43
0.331633
44
Emission
NOx
6.06
5.31
5.51
5.81
5.38
5.73
5.70
4.56
6.34
4.93
6.16
5.12
5.51
5.80
5.38
6.11
6.41
5.44
5.94
6.13
6.51
6.20
6.20
4.38
6.26
4.03
6.44
6.69
5.51
5.38
5.40
6.23
4.46
5.31
4.14
6.85
6.63
5.45
6.43
6.59
5.51
6.18
5.38
6.43
5.667602
44
Factors (g/hp-hr)
CO
0.89
1.04
0.55
0.70
0.49
1.30
0.84
1.25
0.89
1.80
0.89
0.60
0.55
0.70
0.49
0.52
0.96
0.65
1.16
2.68
1.19
1.55
0.46
0.69
0.80
0.56
1.11
0.85
0.55
0.49
0.92
0.30
0.48
1.04
0.78
1.47
0.57
0.59
0.87
1.15
0.63
0.52
0.63
0.76
0.834876
44

PM
0.27
0.35
0.33
0.27
0.27
0.31
0.15
0.18
0.22
0.25
0.20
0.22
0.33
0.27
0.27
0.20
0.18
0.21
0.21
0.24
0.15
0.20
0.12
0.23
0.17
0.18
0.26
0.28
0.33
0.27
0.16
0.17
0.08
0.35
0.13
0.17
0.06
0.21
0.32
0.36
0.18
0.13
0.16
0.20
0.239994
44

Sales wgt
0.0005
0.0005
0.0628
0.0398
0.0545
0.0177
0.0862
0.0174
0.0064
0.0034
0.0563
0.0910
0.1054
0.0652
0.0362
0.0014
0.0005
0.0074
0.1080
0.0322
0.0273
0.0262
0.0018
0.0050
0.0024
0.0005
0.0036
0.0025
0.0136
0.0362
0.0020
0.0058
0.0009
0.0005
0.0028
0.0043
0.0014
0.0504
0.0072
0.0045
0.0018
0.0018
0.0018
0.0027
1.0000

D6

-------
Table D2. 1996
300 to 600 hp
Rated HP
335
543
300
330
362
425
500
455
542
300
397
535
515
300
480
525
375
337
300
313
440
568
350
400
412
322
563
305
335
349
526
493
573
571
308
335
543
300
300
369
Sales-wgt EF
Sample Size
MY Certification Data (cont.)
Emission Factors
HC NOx
0.27 5.51
2.24
0.28
0.34
0.16
0.09
0.17
0.12
0.07
0.08
0.19
0.08
0.05
0.31
0.17
0.25
0.40
0.41
0.51
0.10
0.39
0.37
0.78
0.10
0.35
0.23
0.18
0.24
0.19
0.20
0.17
0.16
0.14
0.31
0.28
0.27
0.22
0.07
0.07
0.24
0.260521
40
5.66
6.13
5.27
5.49
6.38
8.19
5.48
6.05
5.78
4.65
5.79
6.05
5.50
6.85
6.36
6.03
5.99
8.03
6.55
6.55
6.46
6.32
6.28
6.51
5.00
4.56
6.29
5.78
5.41
6.06
5.89
5.86
3.98
5.68
5.51
5.66
4.54
6.35
5.43
6.264393 1
40
(g/hp-hr)
CO
0.74
0.54
0.81
1.07
1.57
2.18
2.24
0.82
1.43
0.43
1.35
2.10
1.44
0.41
1.16
0.45
1.51
1.31
1.28
0.49
0.43
2.17
1.30
0.49
1.76
0.87
0.48
0.72
0.41
0.34
0.60
0.95
0.62
0.48
0.45
0.74
0.54
0.51
0.52
0.51
.353145
40
PM
0.28
0.24
0.28
0.28
0.13
0.08
0.13
0.17
0.31
0.05
0.19
0.34
0.21
0.22
0.17
0.15
0.20
0.22
0.21
0.14
0.18
0.37
0.37
0.14
0.30
0.23
0.18
0.29
0.10
0.15
0.16
0.20
0.17
0.11
0.18
0.28
0.25
0.15
0.04
0.14
0.195978
40
Sales wgt
0.0013
0.0010
0.0249
0.0075
0.3220
0.0155
0.0078
0.0039
0.0959
0.0093
0.0216
0.0186
0.0180
0.0052
0.0833
0.0104
0.0339
0.0170
0.1823
0.0039
0.0052
0.0124
0.0357
0.0129
0.0039
0.0026
0.0078
0.0044
0.0003
0.0016
0.0003
0.0005
0.0005
0.0026
0.0021
0.0023
0.0037
0.0052
0.0078
0.0052
1.0000
D7

-------
Table D2. 1996 MY Certification Data (cont.)
600 to 750 hp
Rated HP
750
750
750
750
660
740
640
730
600
710
740
Sales-wgt EF
Sample Size
HC
0.07
0.07
0.08
0.35
0.05
0.10
0.10
0.05
0.46
0.25
0.24
0.174804
11
Emission
NOx
5.90
5.84
6.01
5.80
6.24
5.53
5.62
5.04
6.86
6.64
5.85
6.063537
11
Factors (g/hp-hr)
CO
1.29
0.90
1.92
1.48
0.83
1.63
0.83
0.99
1.46
2.42
1.37
1.502117
11
PM
0.22
0.16
0.30
0.29
0.14
0.33
0.19
0.18
0.23
0.27
0.21
0.242149
11
Sales wgt
0.1010
0.0056
0.1330
0.0859
0.1627
0.1324
0.0056
0.0960
0.1403
0.1347
0.0028
1.0000
                                        D8

-------
Table D3.  1997 MY Certification Data
100 to 175 hp
Rated HP
100
125
165
110
165
166
100
125
165
114
141
134
168
110
158
153
134
103
106
100
125
165
162
130
134
131
157
168
108
166
121
108
103
172
130
102
172
117
173
122
122
161
161
Sales-wgt EF
Sample Size
Emission Factors (g/hp-hr)
HC
0.35
0.23
0.36



0.35
0.23
0.36
0.39
0.39
0.33
0.43
0.75
0.51




0.35
0.23
0.36
0.62



0.12
0.11
0.17
0.38
0.68
0.20

0.13
0.64



0.54
0.07
0.12
0.23
0.34
0.297479
29
NOx
6.08
6.21
4.95
6.06
6.24
4.95
6.08
6.21
4.95
4.88
4.97
6.59
6.52
6.18
6.26
5.65
6.51
6.26
6.01
6.08
6.21
4.95
6.11
5.58
6.08
5.18
6.55
6.63
5.99
6.21
6.11
5.63
6.19
5.31
6.70
6.68
6.23
6.23
6.57
5.75
4.12
5.96
5.26
5.599201
43
CO
0.70
0.47
0.75



0.70
0.47
0.75
0.88
2.30
1.15
1.25
2.60
1.28




0.70
0.47
0.75
0.90



1.15
0.57
0.37
0.56
1.22
0.70

0.45
1.23



1.83
1.06
0.64
0.83
1.05
0.745072
29
PM
0.28
0.16
0.31



0.30
0.16
0.31


0.17
0.17
0.41
0.38




0.28
0.16
0.31
0.29



0.13
0.06
0.17
0.22
0.18
0.32

0.25
0.36



0.42
0.34


0.19
0.281314
25
HCwgt
0.0015
0.0087
0.1552
0.0000
0.0000
0.0000
0.0102
0.1001
0.2320
0.0038
0.0057
0.0218
0.0044
0.0058
0.0247
0.0000
0.0000
0.0000
0.0000
0.0022
0.0015
0.0537
0.0035
0.0000
0.0000
0.0000
0.0125
0.0091
0.0242
0.0182
0.0085
0.2393
0.0000
0.0258
0.0004
0.0000
0.0000
0.0000
0.0029
0.0029
0.0030
0.0160
0.0029
1.0000

Sales Weightings
NOx wgt
0.0011
0.0069
0.1226
0.0174
0.0915
0.0022
0.0080
0.0790
0.1833
0.0030
0.0045
0.0172
0.0034
0.0046
0.0195
0.0206
0.0041
0.0069
0.0018
0.0017
0.0011
0.0424
0.0028
0.0115
0.0183
0.0115
0.0099
0.0072
0.0191
0.0143
0.0067
0.1890
0.0128
0.0204
0.0003
0.0023
0.0069
0.0023
0.0023
0.0023
0.0024
0.0126
0.0023
1.0000

CO wgt
0.0015
0.0087
0.1552
0.0000
0.0000
0.0000
0.0102
0.1001
0.2320
0.0038
0.0057
0.0218
0.0044
0.0058
0.0247
0.0000
0.0000
0.0000
0.0000
0.0022
0.0015
0.0537
0.0035
0.0000
0.0000
0.0000
0.0125
0.0091
0.0242
0.0182
0.0085
0.2393
0.0000
0.0258
0.0004
0.0000
0.0000
0.0000
0.0029
0.0029
0.0030
0.0160
0.0029
1.0000

PM wgt
0.0015
0.0090
0.1597
0.0000
0.0000
0.0000
0.0104
0.1030
0.2388
0.0000
0.0000
0.0224
0.0045
0.0060
0.0254
0.0000
0.0000
0.0000
0.0000
0.0022
0.0015
0.0552
0.0036
0.0000
0.0000
0.0000
0.0128
0.0094
0.0249
0.0187
0.0087
0.2463
0.0000
0.0266
0.0004
0.0000
0.0000
0.0000
0.0030
0.0030
0.0000
0.0000
0.0030
1.0000

                                       D9

-------
Table D3. 1997 MY Certification Data (cont.)
175 to 300 hp
Rated HP
261
248
280
260
246
225
220
275
205
260
275
280
260
188
296
264
250
189
261
194
189
241
227
193
296
234
248
247
240
225
228
253
182
207
183
227
272
255
255
188
235
201
255
Sales-wgt EF
Sample Size
Emission Factors (g/hp-hr)
HC
0.47
0.34
0.47
0.37
0.34
0.41
0.11
0.11
0.19
0.08
0.08
0.47
0.46
0.50
0.23
0.64
0.10
0.43
0.30
0.30
0.37
0.41
0.51
0.60
0.42
0.31
0.34
0.57
0.35
0.14
0.36
0.55
0.42
0.44
0.54
0.35
0.35
0.25
0.25
0.37
0.31
0.42
0.43
0.307044
43
NOx
6.06
5.31
5.47
5.73
5.27
5.70
6.16
4.56
5.96
6.48
4.93
5.47
6.11
5.29
4.78
6.38
6.41
6.65
4.38
6.26
5.87
6.44
6.72
6.69
5.77
4.22
5.31
6.13
5.36
6.73
5.45
4.64
6.43
6.59
6.63
0.63
6.44
5.85
6.22
5.51
6.41
5.38
6.43
5.723983
43
CO
0.89
1.04
0.52
1.30
1.07
0.84
0.89
1.25
1.73
0.82
1.80
0.52
0.52
1.31
0.72
2.37
0.54
1.04
0.69
0.80
0.76
1.11
1.07
0.85
0.82
0.51
1.04
0.69
0.54
0.64
0.59
1.10
0.87
1.15
0.81
0.51
1.09
0.40
1.10
0.60
0.54
0.63
0.76
0.819777
43
PM
0.27
0.35
0.23
0.39
0.36
0.22
0.27
0.26
0.25
0.29
0.32
0.23
0.27
0.37
0.21
0.41
0.12
0.34
0.23
0.17
0.28
0.26
0.31
0.28
0.25
0.08
0.35
0.17
0.23
0.16
0.21
0.29
0.29
0.36
0.34
0.27
0.23
0.13
0.14
0.18
0.13
0.16
0.20
0.245420
43
HCwgt
0.0048
0.0060
0.1439
0.0282
0.0056
0.1444
0.1523
0.0489
0.0060
0.0854
0.0116
0.0059
0.0104
0.0045
0.0013
0.0085
0.0040
0.0053
0.0240
0.0133
0.0069
0.0115
0.0101
0.0051
0.0008
0.0027
0.0044
0.0011
0.0053
0.0008
0.1289
0.0133
0.0027
0.0027
0.0016
0.0016
0.0027
0.0373
0.0250
0.0053
0.0053
0.0053
0.0053
1.0000

Sales Weightings
NOx wgt
0.0048
0.0060
0.1439
0.0282
0.0056
0.1444
0.1523
0.0489
0.0060
0.0854
0.0116
0.0059
0.0104
0.0045
0.0013
0.0085
0.0040
0.0053
0.0240
0.0133
0.0069
0.0115
0.0101
0.0051
0.0008
0.0027
0.0044
0.0011
0.0053
0.0008
0.1289
0.0133
0.0027
0.0027
0.0016
0.0016
0.0027
0.0373
0.0250
0.0053
0.0053
0.0053
0.0053
1.0000

CO wgt
0.0048
0.0060
0.1439
0.0282
0.0056
0.1444
0.1523
0.0489
0.0060
0.0854
0.0116
0.0059
0.0104
0.0045
0.0013
0.0085
0.0040
0.0053
0.0240
0.0133
0.0069
0.0115
0.0101
0.0051
0.0008
0.0027
0.0044
0.0011
0.0053
0.0008
0.1289
0.0133
0.0027
0.0027
0.0016
0.0016
0.0027
0.0373
0.0250
0.0053
0.0053
0.0053
0.0053
1.0000

PM wgt
0.0048
0.0060
0.1439
0.0282
0.0056
0.1444
0.1523
0.0489
0.0060
0.0854
0.0116
0.0059
0.0104
0.0045
0.0013
0.0085
0.0040
0.0053
0.0240
0.0133
0.0069
0.0115
0.0101
0.0051
0.0008
0.0027
0.0044
0.0011
0.0053
0.0008
0.1289
0.0133
0.0027
0.0027
0.0016
0.0016
0.0027
0.0373
0.0250
0.0053
0.0053
0.0053
0.0053
1.0000

                                       D10

-------
Table D3. 1997 MY Certification Data (cont.)
300 to 600 hp
Rated HP
335
543
425
300
397
362
373
455
599
492
535
559
300
307
430
425
413
590
313
305
493
426
308
335
543
308
330
320
300
381
496
369
526
315
362
Sales-wgt EF
Sample Size
Emission Factors (g/hp-hr)
HC
0.27
0.22
0.09
0.28
0.19
0.16
0.17
0.12
0.04
0.05
0.08
0.07
0.08
0.10
0.38
0.08
0.35
0.34
0.18
0.24
0.16
0.31
0.28
0.27
0.22
0.38
0.07
0.12
0.08
0.21
0.13
0.24
0.45
0.34
0.37
0.155300
35
NOx
5.51
5.66
6.38
6.13
4.65
5.49
8.19
5.48
6.59
6.24
5.79
5.84
5.78
6.52
6.58
6.44
6.51
6.40
4.56
6.29
4.26
3.98
5.68
5.51
5.66
5.70
5.07
7.41
5.62
6.55
6.12
6.50
5.59
5.48
5.29
5.865363
35
CO
0.74
0.54
2.18
0.81
1.35
1.57
2.24
0.82
2.67
0.83
2.10
0.90
0.43
0.51
0.43
0.76
1.76
0.72
0.48
0.72
1.04
0.48
0.45
0.74
0.54
0.39
0.44
0.51
0.45
0.61
0.28
0.51
0.67
0.79
0.82
1.431343
35
PM
0.28
0.24
0.16
0.36
0.19
0.21
0.21
0.17
0.33
0.14
0.34
0.16
0.13
0.14
0.18
0.16
0.29
0.23
0.18
0.29
0.30
0.11
0.20
0.28
0.16
0.18
0.12
0.08
0.12
0.08
0.07
0.14
0.11
0.13
0.12
0.213156
35
HCwgt
0.0004
0.0035
0.0282
0.0339
0.0261
0.4232
0.0141
0.0023
0.1521
0.0052
0.0065
0.0004
0.0173
0.0069
0.0177
0.0355
0.0140
0.0002
0.0121
0.0089
0.0024
0.0040
0.0019
0.0115
0.0275
0.0002
0.0270
0.0008
0.0121
0.0403
0.0379
0.0081
0.0081
0.0081
0.0016
1.0000

Sales Weightings
NOx wgt
0.0004
0.0035
0.0282
0.0339
0.0261
0.4232
0.0141
0.0023
0.1521
0.0052
0.0065
0.0004
0.0173
0.0069
0.0177
0.0355
0.0140
0.0002
0.0121
0.0089
0.0024
0.0040
0.0019
0.0115
0.0275
0.0002
0.0270
0.0008
0.0121
0.0403
0.0379
0.0081
0.0081
0.0081
0.0016
1.0000

CO wgt
0.0004
0.0035
0.0282
0.0339
0.0261
0.4232
0.0141
0.0023
0.1521
0.0052
0.0065
0.0004
0.0173
0.0069
0.0177
0.0355
0.0140
0.0002
0.0121
0.0089
0.0024
0.0040
0.0019
0.0115
0.0275
0.0002
0.0270
0.0008
0.0121
0.0403
0.0379
0.0081
0.0081
0.0081
0.0016
1.0000

PM wgt
0.0004
0.0035
0.0282
0.0339
0.0261
0.4232
0.0141
0.0023
0.1521
0.0052
0.0065
0.0004
0.0173
0.0069
0.0177
0.0355
0.0140
0.0002
0.0121
0.0089
0.0024
0.0040
0.0019
0.0115
0.0275
0.0002
0.0270
0.0008
0.0121
0.0403
0.0379
0.0081
0.0081
0.0081
0.0016
1.0000

                                       Dll

-------
Table D3. 1997 MY Certification Data (cont.)
600 to 750 hp
Rated HP
740
750
740
640
743
750
600
710
750
748
Sales-wgt EF
Sample Size
Emission Factors (g/hp-hr)
HC
0.04
0.08
0.10
0.10
0.05
0.07
0.26
0.25
0.13
0.30
0.135125
10
NOx
5.67
6.01
5.53
5.62
5.04
5.90
6.02
6.64
5.89
6.04
5.872338
10
CO
1.57
1.92
1.63
0.83
0.99
1.29
1.78
2.42
1.07
0.45
1.571034
10
PM
0.25
0.30
0.33
0.19
0.18
0.22
0.24
0.27
0.13
0.24
0.236991
10
HCwgt
0.3355
0.0205
0.0169
0.0319
0.1004
0.0771
0.1597
0.1643
0.0479
0.0456
1.0000

Sales Weightings
NOx wgt
0.3355
0.0205
0.0169
0.0319
0.1004
0.0771
0.1597
0.1643
0.0479
0.0456
1.0000

CO wgt
0.3355
0.0205
0.0169
0.0319
0.1004
0.0771
0.1597
0.1643
0.0479
0.0456
1.0000

PM wgt
0.3355
0.0205
0.0169
0.0319
0.1004
0.0771
0.1597
0.1643
0.0479
0.0456
1.0000

                                       D12

-------
Table D4.
50-1 00 hp
Rated HP
67
79
96
80
67
80
98
62
57
59
84
64
82
53
72
78
52
50
51
55
64
73
56
79
91
59
62
80
98
59
56
86
93
72
54
65
54
50
89
72
78
52
67
92
55
85
59
1998

HC



0.48
0.75
0.72
0.71











0.60
0.39
0.43
0.29
0.48
0.55
0.42


0.72
0.71





0.55
0.05






0.14
0.27



MYCei
Emisj
NOx
6.40
5.74
5.81
7.61
6.35
5.78
6.30
6.23
6.20
6.56
5.74
5.92
5.23
6.32
6.30
6.22
4.59
4.14
6.68
6.16
5.62
5.35
4.88
5.25
6.63
6.65
6.23
5.78
6.30
4.37
4.18
5.42
4.71
4.31
6.31
4.18
2.62
4.38
5.98
4.63
6.05
6.32
4.94
5.62
2.62
2.18
5.90
Emission Factors (g/hp-hr)
       HC+NOx
         4.24
tip-hr) Sales Weightings
CO



4.32
1.96
3.26
1.68











3.04
0.98
2.17
1.08
0.46
2.47
1.32


3.26
1.68





2.42
0.90






1.07
0.99



PM



0.56
0.34
0.51
0.21











0.63
0.28
0.60
0.52
0.27
0.55
0.54


0.51
0.21













0.45
0.27



HCwgt
0.0000
0.0000
0.0000
0.2600
0.1418
0.2786
0.0009
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0118
0.0254
0.0118
0.0016
0.0258
0.0133
0.0000
0.0000
0.0051
0.0009
0.0000
0.0000
0.0000
0.0000
0.0000
0.0077
0.0010
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1213
0.0834
0.0000
0.0000
0.0000
NOx wgt
0.0071
0.0024
0.0006
0.0914
0.0499
0.0979
0.0003
0.0012
0.0012
0.0310
0.0413
0.0049
0.0605
0.0175
0.0006
0.0001
0.0208
0.0036
0.0001
0.0042
0.0089
0.0042
0.0006
0.0091
0.0047
0.0170
0.0012
0.0018
0.0003
0.0042
0.0148
0.0047
0.0030
0.0059
0.0027
0.0003
0.0057
0.0190
0.0066
0.0145
0.0101
0.0060
0.0426
0.0293
0.0015
0.0018
0.0006
CO wgt
0.0000
0.0000
0.0000
0.2581
0.1408
0.2765
0.0009
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0117
0.0252
0.0117
0.0016
0.0256
0.0132
0.0000
0.0000
0.0050
0.0009
0.0000
0.0000
0.0000
0.0000
0.0000
0.0076
0.0010
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1204
0.0828
0.0000
0.0000
0.0000
PM wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
                      D13

-------
Table D4.
50-1 00 hp
Rated HP
58
52
64
60
96
72
68
68
80
59
84
94
82
60
62
75
58
54
67
80
60
70
56
58
Sales-wgt
EF
Sample
Size
1998 MY Certification Data
Emission Factors
HC NOx HC+NOx
3.23
6.62
5.13
6.06
5.09
6.30
5.85
6.44
0.86 5.40
4.33
6.14
5.75
4.84
5.87
6.19
3.87
3.91
5.40
4.89
4.80
4.12
5.59
5.23
5.12
0.528845 5.682411 4.235576
18 71 1
(g/hp-hr)
CO PM HC wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
4.00 0.64 0.0091
0.0000
0.0000
0.0000
1.22 0.44 0.0000
3.96 0.39 0.0000
1.69 0.30 0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
2.753546 0.472055 1.0000
21 19
Sales Weightings
NOx wgt CO wgt
0.0297 0.0000
0.0125
0.0064
0.0297
0.0861
0.0025
0.0772
0.0504
0.0032
0.0036
0.0012
0.0003
0.0011
0.0006
0.0009
0.0046
0.0069
0.0003
0.0148
0.0006
0.0042
0.0006
0.0018
0.0033
1.0000

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0091
0.0000
0.0000
0.0000
0.0032
0.0017
0.0026
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000

PM wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000

D14

-------
Table D4.
100-1 75 hp
Rated HP
167
108
100
125
165
110
165
166
100
125
165
158
109
133
172
114
141
135
155
124
103
158
103
153
106
144
100
125
165
114
148
168
162
108
113
108
121
166
118
103
103
100
102
127
117
172
173
1998 MY
Certification Data (cont.)
Emission
HC
0.34

0.35
0.23
0.36



0.35
0.23
0.36




0.52

0.40




0.57
0.51


0.35
0.23
0.36

0.16
0.34
0.62


0.17
0.68
0.38


0.53
0.57




0.54
NOx
5.26
6.47
6.08
6.21
4.95
6.06
6.24
4.95
6.08
6.21
4.95
6.53
6.41
6.44
6.48
6.54
3.71
5.70
6.39
6.60
6.22
6.26
6.26
5.65
6.01
6.61
6.08
6.21
4.95
5.87
6.58
6.17
6.11
6.11
4.41
5.99
6.11
6.21
6.30
6.19
5.30
5.50
6.68
5.38
6.23
6.23
6.57
Factors (g/hp-hr)

CO PM
1.05

0.70
0.47
0.75



0.70
0.47
0.75




1.18

1.75




1.58
0.49


0.70
0.47
0.75

0.70
0.63
0.90


0.37
1.22
0.56


1.24
1.35




1.83
0.18

0.28
0.16
0.31



0.28
0.16
0.31






0.29




0.39
0.26


0.28
0.16
0.31

0.13
0.13
0.28


0.17
0.18
0.22


0.51
0.47




0.42

HCwgt
0.0003
0.0000
0.1104
0.0041
0.0647
0.0000
0.0000
0.0000
0.1765
0.0537
0.1891
0.0000
0.0000
0.0000
0.0000
0.0014
0.0000
0.2535
0.0000
0.0000
0.0000
0.0000
0.0033
0.0126
0.0000
0.0000
0.0085
0.0012
0.0140
0.0000
0.0003
0.0002
0.0006
0.0000
0.0000
0.0555
0.0117
0.0196
0.0000
0.0000
0.0018
0.0024
0.0000
0.0000
0.0000
0.0000
0.0032
                     Sales Weightings
                   NOx wgt  CO wgt   PM wgt
                     0.0003    0.0003    0.0003
                     0.0009    0.0000    0.0000
                     0.0940    0.1101    0.1112
                     0.0035    0.0041    0.0042
                     0.0551    0.0645    0.0652
                     0.0062    0.0000    0.0000
                     0.0336    0.0000    0.0000
                     0.0029    0.0000    0.0000
                     0.1504    0.1760    0.1779
                     0.0457    0.0535    0.0541
                     0.1611    0.1886    0.1906
                     0.0018    0.0000    0.0000
                     0.0018    0.0000    0.0000
                     0.0018    0.0000    0.0000
                     0.0018    0.0000    0.0000
                     0.0012    0.0014    0.0000
                     0.0018    0.0000    0.0000
                     0.2160    0.2528    0.2555
                     0.0021    0.0000    0.0000
                     0.0068    0.0000    0.0000
                     0.0310    0.0000    0.0000
                     0.0077    0.0000    0.0000
                     0.0028    0.0033    0.0033
                     0.0108    0.0126    0.0127
                     0.0095    0.0000    0.0000
                     0.0001    0.0000    0.0000
                     0.0072    0.0085    0.0086
                     0.0010    0.0012    0.0012
                     0.0119    0.0140    0.0141
                     0.0049    0.0000    0.0000
                     0.0003    0.0003    0.0003
                     0.0002    0.0002    0.0002
                     0.0005    0.0006    0.0006
                     0.0137    0.0000    0.0000
                     0.0020    0.0000    0.0000
                     0.0473    0.0553    0.0559
                     0.0100    0.0117    0.0118
                     0.0167    0.0195    0.0197
                     0.0006    0.0000    0.0000
                     0.0070    0.0000    0.0000
                     0.0015    0.0018    0.0018
                     0.0020    0.0023    0.0024
                     0.0027    0.0000    0.0000
                     0.0009    0.0000    0.0000
                     0.0009    0.0000    0.0000
                     0.0027    0.0000    0.0000
                     0.0027    0.0032    0.0032
D15

-------
Table D4.  1998 MY Certification Data (cont.)
100-175 hp         Emission Factors (g/hp-hr)                    Sales Weightings
Rated HP   HC       NOx     CO       PM       HC wgt    NOxwgt  COwgt   PM wgt
    123                4.12      0.64               0.0000     0.0015    0.0018    0.0018
    122       0.07      5.75      1.06      0.44     0.0021     0.0018    0.0021    0.0022
    142                5.92      1.33      0.31     0.0000     0.0010    0.0011    0.0011
    138                6.68                        0.0000     0.0004    0.0000    0.0000
    161       0.23      5.96      0.83               0.0092     0.0078    0.0092    0.0000
 Sal|S-wgt  0.355336  5.743938  0.961288  0.276378   1.0000     1.0000    1.0000    1.0000

               25        52        27        24
                                        D16

-------
Table D4.
1 75-300 hp
Rated HP
257
261
248
200
215
260
240
278
280
275
205
260
290
260
225
275
200
215
260
240
284
200
253
188
256
296
261
220
234
196
197
263
294
280
294
283
196
240
187
189
241
227
193
296
255
200
215
1998 MY
Certification
Data (cont.
)

Emission Factors (g/hp-hr)
HC
0.43
0.47
0.34
0.26
0.32
0.44
0.29
0.13
0.47
0.11
0.19
0.17
0.10
0.42
0.41
0.04
0.26
0.32
0.44
0.29
0.41
0.19
0.34
0.50
0.46
0.23
0.47
0.20
0.19
0.28
0.23
0.43
0.38
0.49
0.64
0.09
0.35
0.29
0.26
0.37
0.41
0.51
0.60
0.38
0.42
0.26
0.32
NOx
6.43
6.06
5.31
5.13
5.51
5.82
5.38
4.70
5.47
4.56
5.96
6.48
5.60
6.16
5.70
4.76
5.13
5.51
5.82
5.38
5.76
4.05
6.58
5.29
6.11
4.78
6.06
5.87
5.45
5.44
5.52
6.13
5.99
6.14
6.38
6.38
6.52
4.88
5.99
5.87
6.44
6.72
6.69
6.19
5.77
5.13
5.51
CO
0.76
0.89
1.04
0.60
0.55
0.70
0.49
0.51
0.52
1.26
1.73
0.82
2.19
1.30
0.84
0.31
0.60
0.55
0.70
0.49
0.52
0.92
0.57
1.31
0.52
0.72
0.89
0.72
0.62
0.65
0.75
2.68
0.95
2.52
2.37
0.51
0.95
0.73
0.73
0.76
1.11
1.07
0.85
0.54
0.82
0.60
0.55
PM
0.20
0.27
0.35
0.22
0.32
0.27
0.27
0.15
0.23
0.26
0.25
0.29
0.32
0.39
0.22
0.14
0.22
0.32
0.27
0.27
0.22
0.28
0.21
0.37
0.27
0.21
0.27
0.27
0.25
0.28
0.29
0.31
0.23
0.31
0.40
0.12
0.36
0.23
0.15
0.35
0.34
0.33
0.28
0.22
0.26
0.22
0.32
HCwgt
0.0002
0.0013
0.0011
0.0124
0.0184
0.0222
0.0222
0.0061
0.0160
0.0049
0.0056
0.0108
0.0030
0.0018
0.0253
0.0013
0.0726
0.0749
0.0616
0.0738
0.0042
0.0016
0.0016
0.0007
0.0016
0.0002
0.0002
0.0050
0.0104
0.3023
0.0074
0.0040
0.1154
0.0157
0.0007
0.0020
0.0006
0.0056
0.0026
0.0016
0.0028
0.0006
0.0010
0.0002
0.0006
0.0036
0.0049
HCwgt
0.0002
0.0013
0.0011
0.0124
0.0184
0.0222
0.0222
0.0061
0.0160
0.0049
0.0056
0.0108
0.0030
0.0018
0.0253
0.0013
0.0726
0.0749
0.0616
0.0738
0.0042
0.0016
0.0016
0.0007
0.0016
0.0002
0.0002
0.0050
0.0104
0.3023
0.0074
0.0040
0.1154
0.0157
0.0007
0.0020
0.0006
0.0056
0.0026
0.0016
0.0028
0.0006
0.0010
0.0002
0.0006
0.0036
0.0049
Sales Weightings
NOx wgt CO wgt
0.0002 0.0002
0.0013
0.0011
0.0124
0.0184
0.0222
0.0222
0.0061
0.0160
0.0049
0.0056
0.0108
0.0030
0.0018
0.0253
0.0013
0.0726
0.0749
0.0616
0.0738
0.0042
0.0016
0.0016
0.0007
0.0016
0.0002
0.0002
0.0050
0.0104
0.3023
0.0074
0.0040
0.1154
0.0157
0.0007
0.0020
0.0006
0.0056
0.0026
0.0016
0.0028
0.0006
0.0010
0.0002
0.0006
0.0036
0.0049
0.0013
0.0011
0.0124
0.0184
0.0222
0.0222
0.0061
0.0160
0.0049
0.0056
0.0108
0.0030
0.0018
0.0253
0.0013
0.0726
0.0749
0.0616
0.0738
0.0042
0.0016
0.0016
0.0007
0.0016
0.0002
0.0002
0.0050
0.0104
0.3023
0.0074
0.0040
0.1154
0.0157
0.0007
0.0020
0.0006
0.0056
0.0026
0.0016
0.0028
0.0006
0.0010
0.0002
0.0006
0.0036
0.0049
PM wgt
0.0002
0.0013
0.0011
0.0124
0.0184
0.0222
0.0222
0.0061
0.0160
0.0049
0.0056
0.0108
0.0030
0.0018
0.0253
0.0013
0.0726
0.0749
0.0616
0.0738
0.0042
0.0016
0.0016
0.0007
0.0016
0.0002
0.0002
0.0050
0.0104
0.3023
0.0074
0.0040
0.1154
0.0157
0.0007
0.0020
0.0006
0.0056
0.0026
0.0016
0.0028
0.0006
0.0010
0.0002
0.0006
0.0036
0.0049
D17

-------
Table D4.
1 75-300 hp
Rated HP
240
189
252
211
253
231
260
275
248
247
225
210
225
228
190
268
182
207
217
183
227
244
272
255
255
Sales-wgt
EF
Sample
Size
1998 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC
0.29
0.31
0.22
0.37
0.23
0.32
0.18
0.14
0.34
0.57
0.11
0.12
0.14
0.37
0.66
0.44
0.42
0.44
0.36
0.54
0.35
0.19
0.35
0.25
0.25
0.316321
72
NOx
5.38
5.40
6.23
5.42
5.28
4.69
6.35
5.38
5.31
6.13
6.63
6.55
6.73
5.46
6.08
6.50
6.43
6.59
5.49
6.63
0.63
6.30
6.44
5.89
6.22
5.574079
72
CO
0.49
0.92
0.30
0.57
0.47
0.46
0.73
0.48
1.04
0.69
0.57
1.15
0.64
0.60
1.56
0.50
0.87
1.15
1.00
0.81
0.51
1.66
1.09
0.40
1.10
0.722968
72
PM
0.27
0.21
0.23
0.22
0.27
0.15
0.15
0.14
0.35
0.17
0.13
0.20
0.16
0.21
0.40
0.30
0.30
0.36
0.22
0.34
0.27
0.36
0.23
0.13
0.14
0.262486
72
HCwgt
0.0052
0.0010
0.0027
0.0004
0.0002
0.0005
0.0016
0.0002
0.0001
0.0004
0.0028
0.0048
0.0018
0.0294
0.0005
0.0024
0.0004
0.0004
0.0004
0.0002
0.0002
0.0016
0.0016
0.0056
0.0033
1.0000

Sales Weightings
NOx wgt
0.0052
0.0010
0.0027
0.0004
0.0002
0.0005
0.0016
0.0002
0.0001
0.0004
0.0028
0.0048
0.0018
0.0294
0.0005
0.0024
0.0004
0.0004
0.0004
0.0002
0.0002
0.0016
0.0016
0.0056
0.0033
1.0000

CO wgt
0.0052
0.0010
0.0027
0.0004
0.0002
0.0005
0.0016
0.0002
0.0001
0.0004
0.0028
0.0048
0.0018
0.0294
0.0005
0.0024
0.0004
0.0004
0.0004
0.0002
0.0002
0.0016
0.0016
0.0056
0.0033
1.0000

PM wgt
0.0052
0.0010
0.0027
0.0004
0.0002
0.0005
0.0016
0.0002
0.0001
0.0004
0.0028
0.0048
0.0018
0.0294
0.0005
0.0024
0.0004
0.0004
0.0004
0.0002
0.0002
0.0016
0.0016
0.0056
0.0033
1.0000

D18

-------
Table D4.
300-600 hp
Rated HP
310
373
335
543
300
425
300
330
397
362
500
455
599
350
525
480
336
375
336
399
339
517
401
313
420
425
567
586
329
590
306
493
335
375
525
493
572
571
531
327
327
308
335
543
330
330
381
1998 MY
Certification
Data (cont.
)

Emission Factors (g/hp-hr)
HC
0.34
0.24
0.27
0.22
0.08
0.90
0.28
0.33
0.19
0.16
0.13
0.12
0.04
0.22
0.25
0.17
0.14
0.40
0.41
0.18
0.21
0.17
0.23
0.13
0.36
0.08
0.28
0.20
0.26
0.34
0.24
0.16
0.19
0.22
0.17
0.16
0.14
0.31
0.36
0.22
0.24
0.30
0.27
0.02
0.07
0.04
0.21
NOx
5.48
6.50
5.51
5.66
5.78
6.38
6.13
5.28
5.24
5.49
6.10
5.48
6.59
6.52
6.36
6.85
5.48
6.03
5.99
5.33
5.72
5.74
6.02
6.38
6.65
6.44
5.65
4.64
6.38
6.40
6.29
4.26
5.78
5.72
6.06
5.89
5.86
3.98
5.01
6.39
6.11
5.67
5.51
5.66
5.07
5.64
6.55
CO
0.79
0.51
0.74
0.54
0.43
2.17
0.81
1.07
1.35
1.57
1.67
0.82
2.67
1.17
0.45
1.16
0.45
2.02
1.31
0.91
0.92
0.37
0.50
0.59
0.47
0.76
2.26
0.45
0.61
0.72
0.72
1.04
0.41
0.32
0.60
0.95
0.62
0.48
0.40
0.46
0.48
0.45
0.74
0.54
0.44
0.40
0.61
PM
0.13
0.14
0.28
0.24
0.13
0.16
0.36
0.36
0.29
0.21
0.17
0.17
0.33
0.20
0.15
0.18
0.15
0.28
0.30
0.14
0.15
0.13
0.14
0.15
0.18
0.15
0.33
0.18
0.19
0.23
0.37
0.30
0.18
0.20
0.23
0.28
0.24
0.17
0.16
0.14
0.13
0.18
0.28
0.24
0.10
0.16
0.08
HCwgt
0.0011
0.0011
0.0002
0.0016
0.0036
0.0514
0.0118
0.0111
0.0040
0.2369
0.0257
0.0029
0.0715
0.1676
0.0032
0.1718
0.0070
0.0012
0.0084
0.0285
0.0020
0.0630
0.0090
0.0077
0.0118
0.0193
0.0010
0.0029
0.0018
0.0001
0.0086
0.0037
0.0002
0.0014
0.0002
0.0004
0.0004
0.0021
0.0021
0.0021
0.0021
0.0018
0.0027
0.0064
0.0068
0.0114
0.0167
Sales Weightings
HCwgt
0.0011
0.0011
0.0002
0.0016
0.0036
0.0514
0.0118
0.0111
0.0040
0.2369
0.0257
0.0029
0.0715
0.1676
0.0032
0.1718
0.0070
0.0012
0.0084
0.0285
0.0020
0.0630
0.0090
0.0077
0.0118
0.0193
0.0010
0.0029
0.0018
0.0001
0.0086
0.0037
0.0002
0.0014
0.0002
0.0004
0.0004
0.0021
0.0021
0.0021
0.0021
0.0018
0.0027
0.0064
0.0068
0.0114
0.0167
NOx wgt
0.0011
0.0011
0.0002
0.0016
0.0036
0.0514
0.0118
0.0111
0.0040
0.2369
0.0257
0.0029
0.0715
0.1676
0.0032
0.1718
0.0070
0.0012
0.0084
0.0285
0.0020
0.0630
0.0090
0.0077
0.0118
0.0193
0.0010
0.0029
0.0018
0.0001
0.0086
0.0037
0.0002
0.0014
0.0002
0.0004
0.0004
0.0021
0.0021
0.0021
0.0021
0.0018
0.0027
0.0064
0.0068
0.0114
0.0167
CO wgt
0.0011
0.0011
0.0002
0.0016
0.0036
0.0514
0.0118
0.0111
0.0040
0.2369
0.0257
0.0029
0.0715
0.1676
0.0032
0.1718
0.0070
0.0012
0.0084
0.0285
0.0020
0.0630
0.0090
0.0077
0.0118
0.0193
0.0010
0.0029
0.0018
0.0001
0.0086
0.0037
0.0002
0.0014
0.0002
0.0004
0.0004
0.0021
0.0021
0.0021
0.0021
0.0018
0.0027
0.0064
0.0068
0.0114
0.0167
PM wgt
0.0011
0.0011
0.0002
0.0016
0.0036
0.0514
0.0118
0.0111
0.0040
0.2369
0.0257
0.0029
0.0715
0.1676
0.0032
0.1718
0.0070
0.0012
0.0084
0.0285
0.0020
0.0630
0.0090
0.0077
0.0118
0.0193
0.0010
0.0029
0.0018
0.0001
0.0086
0.0037
0.0002
0.0014
0.0002
0.0004
0.0004
0.0021
0.0021
0.0021
0.0021
0.0018
0.0027
0.0064
0.0068
0.0114
0.0167
D19

-------
Table D4. 1998 MY Certification Data (cont.)
300-600 hp         Emission Factors (g/hp-hr)
              HC       NOx      CO       PM
             0.13      6.12      0.28      0.07
Rated HP
  496
Sales-wgt
   EF
 Sample
  Size
                                    Sales Weightings
                          HCwgt   NOxwgt   COwgt   PM wgt
                          0.0021     0.0021    0.0021    0.0021
           0.209071  6.126551  1.289223 0.198893   1.0000    1.0000    1.0000    1.0000
              48
48
48
48
Table D4.
600-750 hp
Rated HP
660
640
740
600
606
725
750
750
750
750
750
740
Sales-wgt
EF
Sample
Size
1998 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC NOx CO PM
0.10 6.03 0.54 0.13
0.11
0.10
0.26
0.16
0.16
0.07
0.07
0.06
0.35
0.13
0.24
0.190719
12
5.62
5.53
6.02
6.01
5.88
5.84
5.90
4.48
5.80
5.89
5.85
5.866023
12
0.83
1.62
1.78
0.58
0.84
0.90
1.29
1.43
1.48
1.06
1.37
1.277422
12
0.19
0.33
0.24
0.12
0.12
0.16
0.22
0.24
0.30
0.13
0.28
0.205116
12
HCwgt
0.0630
0.0132
0.0350
0.2955
0.1128
0.0855
0.0210
0.1089
0.0389
0.1322
0.0855
0.0086
1.0000

Sales Weightings
NOx wgt CO wgt
0.0630 0.0630
0.0132
0.0350
0.2955
0.1128
0.0855
0.0210
0.1089
0.0389
0.1322
0.0855
0.0086
1.0000

0.0132
0.0350
0.2955
0.1128
0.0855
0.0210
0.1089
0.0389
0.1322
0.0855
0.0086
1.0000

PM wgt
0.0630
0.0132
0.0350
0.2955
0.1128
0.0855
0.0210
0.1089
0.0389
0.1322
0.0855
0.0086
1.0000

                                        D20

-------
Table D5. 1999 MY Certification Data
25-50 hp
Rated HP HC

34
36
45
50
38
35
39
47
28
33
40
47
27
29
40
45
28
27 0.17
37 0.16
32 0.26
27 0.09
39 0.14
34 0.16
35 0.56
34 0.08
40 0.69
34
46
34
47 0.12
38
26
31
42
26
41
31
31
37
40 0.18
30
38
25
33
30
35
Emission Factors (g/hp-hr)
NOx




6.14













4.29
3.56
4.22
3.95
4.59
3.30
4.54
4.56
6.18



6.71









4.99






HC+NOx

5.21
3.12
5.95

6.69
5.68
6.58
5.84
3.76
3.65
4.50
3.38
5.66
4.11
2.78
4.04
3.57
4.46
3.72
4.49
4.04
4.74
3.46
5.10
4.64
6.88
4.59
3.79
3.80
6.83
6.16
4.64
3.80
3.84
4.46
4.81
5.27
5.11
4.47
5.17
2.79
3.62
5.78
2.37
5.29
5.48
CO

1.44
1.31
0.48

1.92
1.74
1.84
1.35
1.24
0.87
0.62
0.87
1.62
1.16
1.62
0.87
2.65
1.25
2.30
1.61
0.82
0.90
0.68
1.52
0.90
1.62
0.92
0.68
0.98
0.74
1.66
1.30
1.16
0.77
0.96
0.75
0.74
0.80
0.80
0.94
3.06
2.13
3.66
1.58
1.50
1.61
PM

0.38
0.40
0.26

0.32
0.21
0.11
0.09
0.20
0.17
0.20
0.27
0.56
0.35
0.42
0.38
0.43
0.52
0.60
0.54
0.42
0.45
0.30
0.48
0.40
0.25
0.42
0.33
0.54
0.30
0.41
0.28
0.36
0.24
0.35
0.25
0.19
0.26
0.29
0.48
0.46
0.51
0.43
0.53
0.33
0.36
HC frac of
HC+NOx*

















0.038763
0.043011
0.058036
0.022277
0.029598
0.046243
0.109804
0.017241
0.100868



0.01757









0.034632






HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0019
0.0027
0.0360
0.0046
0.0115
0.0028
0.8386
0.0616
0.0046
0.0000
0.0000
0.0000
0.0042
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0315
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Sales Weighting
NOx wgt

0.0000
0.0000
0.0000
0.1061
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0014
0.0020
0.0262
0.0034
0.0084
0.0020
0.6112
0.0449
0.0034
0.0000
0.0000
0.0000
0.0031
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0230
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
HC+NOx
wgt
0.0107
0.0011
0.0011
0.0000
0.0113
0.0282
0.0068
0.0056
0.0025
0.0033
0.0013
0.0007
0.0008
0.0310
0.0507
0.0158
0.0017
0.0003
0.0004
0.0048
0.0006
0.0016
0.0004
0.1127
0.0083
0.0006
0.0001
0.0008
0.0058
0.0006
0.0451
0.0011
0.0163
0.0047
0.0417
0.0008
0.0118
0.0662
0.1936
0.0042
0.0013
0.0025
0.0045
0.0017
0.0008
0.0025
CO wgt

0.0107
0.0011
0.0011
0.0000
0.0113
0.0282
0.0068
0.0056
0.0025
0.0033
0.0013
0.0007
0.0008
0.0310
0.0507
0.0158
0.0017
0.0003
0.0004
0.0048
0.0006
0.0016
0.0004
0.1127
0.0083
0.0006
0.0001
0.0008
0.0058
0.0006
0.0451
0.0011
0.0163
0.0047
0.0417
0.0008
0.0118
0.0662
0.1936
0.0042
0.0013
0.0025
0.0045
0.0017
0.0008
0.0025
PM wgt

0.0107
0.0011
0.0011
0.0000
0.0113
0.0282
0.0068
0.0056
0.0025
0.0033
0.0013
0.0007
0.0008
0.0310
0.0507
0.0158
0.0017
0.0003
0.0004
0.0048
0.0006
0.0016
0.0004
0.1127
0.0083
0.0006
0.0001
0.0008
0.0058
0.0006
0.0451
0.0011
0.0163
0.0047
0.0417
0.0008
0.0118
0.0662
0.1936
0.0042
0.0013
0.0025
0.0045
0.0017
0.0008
0.0025
D21

-------
Table D5. 1999 MY Certification Data
25-50 hp Emission Factors (g/hp-hr)
Rated HP HC NOx

40
44
44
38
30
39
35
44
34 3.53
49 3.20
49 4.85
28
30
33
41
29
37
37
30
45
38
48
34
46
41
48
27
39
Sale*wgt Q4965 4jm
Sample „ „
CalcHC* 0.2347
Calc NOx* 4.7487
HC+NOx

5.53
5.56
5.96
6.00
6.51
4.73
6.27
6.19
3.55
3.31

5.78
5.82
5.76
5.97
5.82
6.76
6.03
6.07
5.85
5.79
6.00
5.94
6.01
5.76
6.25
3.04
5.53
4.9834
72


CO

2.57
1.69
2.39
1.25
3.22
1.01
2.35
1.09
1.22
1.29

3.61
2.93
2.74
1.35
2.82
1.71
2.59
3.01
3.21
3.23
1.56
1.87
2.54
2.79
1.59
0.98
1.96
1.5421
72


PM HC frac of
HC+NOx*
0.22
0.34
0.19
0.36
0.50
0.34
0.48
0.53
0.54
0.40

0.40
0.35
0.28
0.49
0.25
0.40
0.35
0.38
0.45
0.39
0.44
0.34
0.20
0.33
0.28
0.40
0.26
0.3561
72 0.047095


HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



Sales Weighting
NOx wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0458
0.0917
0.0275
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



HC+NOx
wgt
0.0025
0.0017
0.0017
0.0001
0.0034
0.0021
0.0118
0.0225
0.0085
0.0169
0.0000
0.0152
0.0026
0.0596
0.0006
0.0070
0.0007
0.0098
0.0169
0.0423
0.0011
0.0001
0.0507
0.0039
0.0041
0.0002
0.0036
0.0015
1.0000



CO wgt

0.0025
0.0017
0.0017
0.0001
0.0034
0.0021
0.0118
0.0225
0.0085
0.0169
0.0000
0.0152
0.0026
0.0596
0.0006
0.0070
0.0007
0.0098
0.0169
0.0423
0.0011
0.0001
0.0507
0.0039
0.0041
0.0002
0.0036
0.0015
1.0000



PM wgt

0.0025
0.0017
0.0017
0.0001
0.0034
0.0021
0.0118
0.0225
0.0085
0.0169
0.0000
0.0152
0.0026
0.0596
0.0006
0.0070
0.0007
0.0098
0.0169
0.0423
0.0011
0.0001
0.0507
0.0039
0.0041
0.0002
0.0036
0.0015
1.0000



* HC fraction of HC+NOx = HC + (HC+NOx). The average HC fraction is not a sales-weighted average.
Calculated HC = ( avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                             D22

-------
Table D5 . 1999 MY Certification Data (cont.)
50-1 00 hp
Rated HP
67
79
96
80
67
75
80
56
75
98
62
57
55
59
84
59
74
82
53
56
60
72
56
70
96
74
78
52
50
52
54
51
61
64
73
56
63
71
91
59
80
98
56
59
56
86
93
Emission Factors (g/hp-hr)
HC



0.48
0.75
0.70
0.72
0.46
0.70
0.71





0.89













0.17
0.69
0.60
0.46
0.43
0.24
0.48
0.52
0.55
0.42

0.72
0.71
0.46




NOx
6.40
5.74
5.81
7.61
6.35
5.68
5.78
5.71
5.68
6.30
6.23
6.20
5.80
6.56
5.74
8.82
5.82
5.23
6.32

6.16
6.30
5.21
5.02
6.32
3.22
6.22
4.59
4.14
5.22
4.15
6.68
6.07
5.62
4.79
4.88
6.27
5.27
6.63
6.65
5.78
6.30
5.71
4.37
4.18
5.42
4.71
HC+NOx CO



4.32
1.96
2.28
3.26
2.19
2.28
1.68





3.55



6.70 2.22









1.18
1.45
3.04
1.33
2.17
0.87
0.46
1.67
2.17
1.32

3.26
1.68
2.19




PM



0.56
0.34
0.49
0.51
0.29
0.49
0.21





0.84



0.34









0.45
0.36
0.63
0.32
0.60
0.52
0.27
0.57
0.57
0.54

0.51
0.21
0.29




HCwgt
0.0000
0.0000
0.0000
0.1942
0.1177
0.1618
0.0647
0.0309
0.0486
0.0008
0.0000
0.0000
0.0000
0.0000
0.0000
0.0099
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0049
0.0183
0.0003
0.0121
0.0056
0.0110
0.0003
0.0118
0.0236
0.0287
0.0000
0.0044
0.0008
0.0002
0.0000
0.0000
0.0000
0.0000
Sales Weightings
NOx wgt
0.0035
0.0007
0.0005
0.0652
0.0395
0.0544
0.0217
0.0104
0.0163
0.0003
0.0010
0.0010
0.0010
0.0216
0.0306
0.0033
0.0045
0.0552
0.0280
0.0000
0.0173
0.0018
0.0040
0.0005
0.0006
0.0049
0.0000
0.0148
0.0030
0.0016
0.0062
0.0001
0.0041
0.0019
0.0037
0.0001
0.0040
0.0079
0.0096
0.0230
0.0015
0.0003
0.0001
0.0022
0.0148
0.0089
0.0074
HC+NOx
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.9552
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt
0.0000
0.0000
0.0000
0.1802
0.1092
0.1502
0.0601
0.0287
0.0451
0.0008
0.0000
0.0000
0.0000
0.0000
0.0000
0.0092
0.0000
0.0000
0.0000
0.0655
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0045
0.0170
0.0003
0.0112
0.0052
0.0102
0.0003
0.0109
0.0219
0.0266
0.0000
0.0041
0.0008
0.0002
0.0000
0.0000
0.0000
0.0000
PM wgt
0.0000
0.0000
0.0000
0.1814
0.1100
0.1512
0.0605
0.0289
0.0454
0.0008
0.0000
0.0000
0.0000
0.0000
0.0000
0.0092
0.0000
0.0000
0.0000
0.0660
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0045
0.0171
0.0003
0.0113
0.0052
0.0103
0.0003
0.0110
0.0221
0.0268
0.0000
0.0041
0.0008
0.0002
0.0000
0.0000
0.0000
0.0000
D23

-------
Table D5. 1999 MY'
50-1 00 hp E
Rated HP HC
72
54 0.55
58 0.08
59
54
79
50
57
55
51
87
52
89
67 0.14
92 0.27
58
85
59
58
81
52
64
60
96
68
68
80 0.83
80 0.86
59
84
94
82
62
100
62
75
58
54
67
80
56
58
60
70
93
100
Certif
imissh
NOx
4.31
6.31
3.32
3.34
2.62
5.06

4.46
2.91
5.35
5.92
6.32
6.40
4.94
5.62
3.00
2.18
5.90
3.23
5.43
6.62
5.13
6.06
5.09
5.85
6.34
6.00
5.40
4.33
6.14
5.75
4.84
6.06
6.27
6.19
3.87
3.91
5.40
4.89
4.80
5.23
5.12
4.12
5.59
5.35
5.73
Emission Factors (g/hp-hr)
        HC+NOx
          3.41
          4.09
ip-hr)
CO

2.42
0.89



0.80






1.07
0.99











3.19
4.00



1.22
3.96
0.87
1.69











Sales Weightings
PM HC wgt
0.0000
0.0060
0.0011
0.0000
0.0000
0.0000
0.25 0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.45 0.1378
0.27 0.0902
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.63 0.0063
0.64 0.0079
0.0000
0.0000
0.0000
0.44 0.0000
0.39 0.0000
0.41 0.0000
0.30 0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
NOx wgt
0.0119
0.0020
0.0004
0.0002
0.0047
0.0002
0.0000
0.0061
0.0014
0.0083
0.0058
0.0050
0.0005
0.0463
0.0303
0.0012
0.0013
0.0010
0.0247
0.0059
0.0104
0.0049
0.0247
0.1503
0.0652
0.0420
0.0021
0.0027
0.0030
0.0010
0.0003
0.0010
0.0000
0.0003
0.0003
0.0020
0.0022
0.0001
0.0163
0.0005
0.0020
0.0004
0.0025
0.0049
0.0005
0.0002
HC+NOx
0.0000
0.0000
0.0149
0.0000
0.0000
0.0000
0.0299
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt
0.0000
0.0056
0.0010
0.0000
0.0000
0.0000
0.0020
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1279
0.0837
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0059
0.0074
0.0000
0.0000
0.0000
0.0029
0.0001
0.0007
0.0007
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
PM wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0021
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1288
0.0842
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0059
0.0074
0.0000
0.0000
0.0000
0.0029
0.0001
0.0007
0.0007
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
                       D24

-------
Table D5.  1999 MY Certification Data (cont.)
50-100 hp           Emission Factors (g/hp-hr)                       Sales Weightings
 Rated HP    HC    NOx   HC+NOx   CO    PM    HC wgt  NOxwgt  HC+NOx  COwgt   PM wgt

 Sales-wgt  0517642 5.613376  6.569501  2.34687 0.452553  1.0000   1.0000    1.0000   1.0000   1.0000

  SaQmple     27      91       3      33     31
   Size
                                          D25

-------
Table D5.
100-1 75 hp
Rated HP
167
108
100
125
155
110
165
166
100
125
158
109
133
141
172
168
162
135
155
108
157
103
144
144
100
125
155
114
103
151
120
144
118
113
173
108
116
168
118
164
103
120
173
115
135
150
103
1999 MY
Certification
Data
(cont.)

Emission Factors (g/hp-hr)
HC
0.34

0.35
0.23
0.38



0.35
0.23





0.11
0.62
0.40



0.57
0.53

0.35
0.23
0.38








0.17
0.62
0.37






0.45
0.50
0.53
NOx
5.26
6.47
6.08
6.21
4.23
6.06
6.24
4.95
6.08
6.21
6.53
6.41
6.50
4.97
4.83
6.17
6.11
5.70
6.39
6.55
6.65
6.26
6.08
6.61
6.08
6.21
4.23
5.87
5.94
5.60
5.50
5.80
5.52
4.41
5.79
5.99
5.36
5.68
6.30
5.92
6.19
5.55
6.05
5.77
6.68
5.74
5.30
CO
1.05

0.70
0.47
0.75



0.70
0.47





0.63
0.90
1.75



1.58
0.55

0.70
0.47
0.75








0.37
1.39
0.54






0.92
1.06
1.24
PM
0.18

0.28
0.16
0.35



0.28
0.16





0.13
0.29
0.29



0.39
0.28

0.28
0.16
0.35








0.17
0.18
0.17






0.24
0.49
0.51
HCwgt
0.0004
0.0000
0.1343
0.0048
0.1246
0.0000
0.0000
0.0000
0.2077
0.1179
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0004
0.2486
0.0000
0.0000
0.0000
0.0071
0.0187
0.0000
0.0100
0.0014
0.0165
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0515
0.0101
0.0257
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0009
0.0009
0.0021
Sales Weightings
HCwgt
0.0004
0.0000
0.1343
0.0048
0.1246
0.0000
0.0000
0.0000
0.2077
0.1179
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0004
0.2486
0.0000
0.0000
0.0000
0.0071
0.0187
0.0000
0.0100
0.0014
0.0165
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0515
0.0101
0.0257
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0009
0.0009
0.0021
NOx wgt
0.0003
0.0005
0.1074
0.0039
0.0996
0.0014
0.0373
0.0030
0.1660
0.0942
0.0020
0.0020
0.0020
0.0020
0.0020
0.0003
0.0003
0.1987
0.0022
0.0102
0.0074
0.0056
0.0150
0.0001
0.0080
0.0011
0.0132
0.0010
0.0001
0.0002
0.0200
0.0121
0.0007
0.0050
0.0005
0.0411
0.0081
0.0206
0.0006
0.0161
0.0125
0.0453
0.0050
0.0002
0.0007
0.0007
0.0017
CO wgt
0.0004
0.0000
0.1342
0.0048
0.1245
0.0000
0.0000
0.0000
0.2075
0.1178
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0004
0.2483
0.0000
0.0000
0.0000
0.0070
0.0187
0.0000
0.0100
0.0014
0.0165
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0514
0.0101
0.0257
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0009
0.0009
0.0021
PM wgt
0.0004
0.0000
0.1355
0.0049
0.1257
0.0000
0.0000
0.0000
0.2095
0.1189
0.0000
0.0000
0.0000
0.0000
0.0000
0.0004
0.0004
0.2507
0.0000
0.0000
0.0000
0.0071
0.0189
0.0000
0.0101
0.0014
0.0166
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0519
0.0102
0.0260
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0009
0.0009
0.0022
D26

-------
Table D5.
100-1 75 hp
Rated HP
130
100
114
127
117
172
173
123
122
142
138
161
Sales-wgt
EF
Sample
Size
1999 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC NOx CO PM
0.63 6.61 1.21 0.36
0.57 5.50
6.39
5.38
6.23
6.23
0.54 6.57
4.12
0.07 5.75
5.92
6.68
0.23 5.96
0.351590 5.749792
25 59
1.35 0.47




1.83 0.42
0.64
1.06 0.43
1.33 0.31

0.83
0.937310 0.270345
27 25
HCwgt
0.0015
0.0028
0.0000
0.0000
0.0000
0.0000
0.0013
0.0000
0.0010
0.0000
0.0000
0.0094
1.0000

Sales Weightings
NOx wgt CO wgt
0.0012 0.0015
0.0022
0.0030
0.0010
0.0010
0.0030
0.0010
0.0003
0.0008
0.0005
0.0005
0.0075
1.0000

0.0028
0.0000
0.0000
0.0000
0.0000
0.0013
0.0003
0.0010
0.0007
0.0000
0.0093
1.0000

PM wgt
0.0015
0.0028
0.0000
0.0000
0.0000
0.0000
0.0013
0.0000
0.0010
0.0007
0.0000
0.0000
1.0000

D27

-------
Table D5.
1 75-300 hp
Rated HP
257
200
215
260
240
280
275
205
255
294
260
225
240
200
215
260
240
280
200
253
296
261
248
275
220
234
196
197
294
285
216
285
237
196
187
186
189
249
243
241
227
193
200
215
240
280
189
1999 MY
Certification
Data
(cont.)

Emission Factors (g/hp-hr)
HC
0.43
0.26
0.32
0.44
0.29
0.47
0.11
0.19
0.08
0.09
0.36
0.41
0.10
0.26
0.32
0.44
0.29
0.47
0.25
0.34
0.31
0.47
0.34
0.14
0.20
0.19
0.28
0.23
0.38
0.46
0.59
0.47
0.78
0.35
0.26
0.34
0.37
0.48
0.40
0.41
0.51
0.60
0.26
0.32
0.29
0.47
0.31
NOx
6.43
5.13
5.51
5.82
5.38
5.47
4.56
5.96
6.20
5.45
5.73
5.70
5.06
5.13
5.51
5.82
5.38
5.47
5.43
6.58
6.41
6.06
5.31
5.38
5.87
5.45
5.44
5.52
5.99
6.51
6.20
4.59
6.32
6.52
5.99
6.28
5.87
6.37
5.88
6.44
6.72
6.69
5.13
5.51
5.38
5.47
5.40
CO
0.76
0.60
0.55
0.70
0.49
0.52
1.26
1.73
0.96
2.19
1.30
0.84
0.38
0.60
0.55
0.70
0.49
0.52
1.23
0.57
0.96
0.89
1.04
0.48
0.72
0.62
0.65
0.75
0.95
1.19
1.55
0.73
1.31
0.95
0.73
0.69
0.76
1.08
1.67
1.11
1.07
0.85
0.60
0.55
0.49
0.52
0.92
PM
0.20
0.22
0.32
0.27
0.27
0.23
0.26
0.25
0.27
0.34
0.39
0.22
0.15
0.22
0.32
0.27
0.27
0.23
0.35
0.20
0.25
0.27
0.35
0.14
0.27
0.25
0.28
0.29
0.23
0.22
0.28
0.26
0.38
0.36
0.15
0.23
0.35
0.24
0.37
0.34
0.33
0.21
0.22
0.32
0.27
0.23
0.21
HCwgt
0.0002
0.0290
0.0136
0.0091
0.0091
0.0207
0.0012
0.0041
0.0108
0.0041
0.0009
0.0252
0.0414
0.0746
0.0787
0.0575
0.0828
0.0083
0.0015
0.0015
0.0015
0.0002
0.0002
0.0002
0.0043
0.0108
0.2781
0.0097
0.0988
0.0146
0.0260
0.0040
0.0002
0.0017
0.0039
0.0017
0.0011
0.0002
0.0001
0.0008
0.0034
0.0004
0.0034
0.0046
0.0049
0.0005
0.0009
Sales Weightings
HCwgt
0.0002
0.0290
0.0136
0.0091
0.0091
0.0207
0.0012
0.0041
0.0108
0.0041
0.0009
0.0252
0.0414
0.0746
0.0787
0.0575
0.0828
0.0083
0.0015
0.0015
0.0015
0.0002
0.0002
0.0002
0.0043
0.0108
0.2781
0.0097
0.0988
0.0146
0.0260
0.0040
0.0002
0.0017
0.0039
0.0017
0.0011
0.0002
0.0001
0.0008
0.0034
0.0004
0.0034
0.0046
0.0049
0.0005
0.0009
NOx wgt
0.0002
0.0290
0.0136
0.0091
0.0091
0.0207
0.0012
0.0041
0.0108
0.0041
0.0009
0.0252
0.0414
0.0746
0.0787
0.0575
0.0828
0.0083
0.0015
0.0015
0.0015
0.0002
0.0002
0.0002
0.0043
0.0108
0.2781
0.0097
0.0988
0.0146
0.0260
0.0040
0.0002
0.0017
0.0039
0.0017
0.0011
0.0002
0.0001
0.0008
0.0034
0.0004
0.0034
0.0046
0.0049
0.0005
0.0009
CO wgt
0.0002
0.0290
0.0136
0.0091
0.0091
0.0207
0.0012
0.0041
0.0108
0.0041
0.0009
0.0252
0.0414
0.0746
0.0787
0.0575
0.0828
0.0083
0.0015
0.0015
0.0015
0.0002
0.0002
0.0002
0.0043
0.0108
0.2781
0.0097
0.0988
0.0146
0.0260
0.0040
0.0002
0.0017
0.0039
0.0017
0.0011
0.0002
0.0001
0.0008
0.0034
0.0004
0.0034
0.0046
0.0049
0.0005
0.0009
PM wgt
0.0002
0.0290
0.0136
0.0091
0.0091
0.0207
0.0012
0.0041
0.0108
0.0041
0.0009
0.0252
0.0414
0.0746
0.0787
0.0575
0.0828
0.0083
0.0015
0.0015
0.0015
0.0002
0.0002
0.0002
0.0043
0.0108
0.2781
0.0097
0.0988
0.0146
0.0260
0.0040
0.0002
0.0017
0.0039
0.0017
0.0011
0.0002
0.0001
0.0008
0.0034
0.0004
0.0034
0.0046
0.0049
0.0005
0.0009
D28

-------
Table D5.
1 75-300 hp
Rated HP
252
211
253
244
247
184
280
298
225
210
210
225
286
190
268
177
182
207
217
183
227
244
272
255
Sales-wgt
EF
Sample
Size
1999 MY
Certification Data (cont.)
Emission Factors (g/hp-hr)
HC
0.22
0.37
0.23
0.39
0.57
0.30
0.19
0.37
0.11
0.13
0.12
0.14
0.39
0.66
0.44
0.34
0.42
0.44
0.36
0.54
0.35
0.19
0.35
0.25
0.314974
71
NOx
6.23
5.42
5.28
6.24
6.13
6.70
5.68
6.32
6.63
6.73
6.55
6.73
5.07
6.08
6.50
6.20
6.43
6.59
5.49
6.63
6.34
6.30
6.44
5.89
5.549376
71
CO
0.30
0.57
0.47
0.74
0.69
0.61
0.51
1.16
0.57
1.77
1.15
0.64
0.50
1.56
0.50
0.89
0.87
1.15
1.00
0.81
0.51
1.66
1.09
0.40
0.695869
71
PM
0.23
0.22
0.27
0.18
0.17
0.18
0.18
0.30
0.13
0.21
0.20
0.16
0.20
0.40
0.22
0.28
0.30
0.36
0.22
0.34
0.27
0.36
0.23
0.13
0.257528
71
HCwgt
0.0026
0.0003
0.0002
0.0005
0.0003
0.0010
0.0017
0.0012
0.0001
0.0019
0.0017
0.0017
0.0246
0.0005
0.0013
0.0004
0.0004
0.0004
0.0004
0.0002
0.0002
0.0015
0.0015
0.0055
1.0000

Sales Weightings
NOx wgt
0.0026
0.0003
0.0002
0.0005
0.0003
0.0010
0.0017
0.0012
0.0001
0.0019
0.0017
0.0017
0.0246
0.0005
0.0013
0.0004
0.0004
0.0004
0.0004
0.0002
0.0002
0.0015
0.0015
0.0055
1.0000

CO wgt
0.0026
0.0003
0.0002
0.0005
0.0003
0.0010
0.0017
0.0012
0.0001
0.0019
0.0017
0.0017
0.0246
0.0005
0.0013
0.0004
0.0004
0.0004
0.0004
0.0002
0.0002
0.0015
0.0015
0.0055
1.0000

PM wgt
0.0026
0.0003
0.0002
0.0005
0.0003
0.0010
0.0017
0.0012
0.0001
0.0019
0.0017
0.0017
0.0246
0.0005
0.0013
0.0004
0.0004
0.0004
0.0004
0.0002
0.0002
0.0015
0.0015
0.0055
1.0000

D29

-------
Table D5.
300-600 hp
Rated HP
310
415
340
300
425
300
330
397
362
500
455
599
535
350
430
480
525
336
422
563
308
335
543
336
336
339
399
517
401
431
361
350
313
430
425
586
329
590
335
306
326
493
493
335
375
525
571
1999 MY
Certification
Data
(cont.)

Emission Factors (g/hp-hr)
HC
0.34
0.10
0.12
0.08
0.90
0.28
0.33
0.19
0.16
0.13
0.12
0.04
0.08
0.22
0.14
0.17
0.16
0.14
0.15
0.14
0.28
0.27
0.22
0.37
0.41
0.21
0.18
0.17
0.23
0.17
0.20
0.08
0.13
0.35
0.08
0.20
0.26
0.34
0.26
0.24
0.50
0.16
0.16
0.19
0.22
0.17
0.31
NOx
5.48
4.65
3.91
5.78
6.38
6.13
5.28
4.65
5.49
6.10
5.48
6.59
5.79
6.52
6.29
6.85
6.52
5.48
4.97
5.11
5.68
5.51
5.66
4.65
5.99
5.72
5.33
5.74
6.02
5.59
5.77
5.74
6.38
6.64
6.44
4.64
6.38
6.40
6.17
6.29
4.04
4.26
5.89
5.78
5.72
6.06
3.98
CO
0.79
0.40
0.56
0.43
2.17
0.81
1.07
1.35
1.57
1.67
0.82
2.67
2.10
1.17
0.34
1.16
0.65
0.45
0.40
0.40
0.45
0.74
0.54
0.68
1.31
0.92
0.91
0.37
0.50
0.43
0.62
2.10
0.59
0.56
0.76
0.45
0.61
0.72
1.05
0.72
0.43
1.04
0.95
0.41
0.32
0.60
0.48
PM
0.13
0.08
0.17
0.13
0.16
0.36
0.36
0.19
0.21
0.17
0.17
0.33
0.34
0.20
0.13
0.18
0.16
0.15
0.11
0.11
0.20
0.28
0.25
0.25
0.30
0.15
0.15
0.13
0.14
0.15
0.16
0.15
0.14
0.19
0.16
0.18
0.19
0.24
0.32
0.37
0.14
0.22
0.28
0.18
0.20
0.23
0.17
HCwgt
0.0011
0.0036
0.0271
0.0036
0.0522
0.0049
0.0060
0.0027
0.1859
0.0260
0.0036
0.0763
0.0060
0.0597
0.0199
0.1809
0.0109
0.0071
0.0007
0.0004
0.0016
0.0027
0.0099
0.0282
0.0072
0.0035
0.0047
0.0575
0.0158
0.0071
0.0061
0.0089
0.0116
0.0022
0.0689
0.0043
0.0025
0.0001
0.0004
0.0137
0.0010
0.0014
0.0004
0.0002
0.0038
0.0002
0.0022
Sales Weightings
HCwgt
0.0011
0.0036
0.0271
0.0036
0.0522
0.0049
0.0060
0.0027
0.1859
0.0260
0.0036
0.0763
0.0060
0.0597
0.0199
0.1809
0.0109
0.0071
0.0007
0.0004
0.0016
0.0027
0.0099
0.0282
0.0072
0.0035
0.0047
0.0575
0.0158
0.0071
0.0061
0.0089
0.0116
0.0022
0.0689
0.0043
0.0025
0.0001
0.0004
0.0137
0.0010
0.0014
0.0004
0.0002
0.0038
0.0002
0.0022
NOx wgt
0.0011
0.0036
0.0271
0.0036
0.0522
0.0049
0.0060
0.0027
0.1859
0.0260
0.0036
0.0763
0.0060
0.0597
0.0199
0.1809
0.0109
0.0071
0.0007
0.0004
0.0016
0.0027
0.0099
0.0282
0.0072
0.0035
0.0047
0.0575
0.0158
0.0071
0.0061
0.0089
0.0116
0.0022
0.0689
0.0043
0.0025
0.0001
0.0004
0.0137
0.0010
0.0014
0.0004
0.0002
0.0038
0.0002
0.0022
CO wgt
0.0011
0.0036
0.0271
0.0036
0.0522
0.0049
0.0060
0.0027
0.1859
0.0260
0.0036
0.0763
0.0060
0.0597
0.0199
0.1809
0.0109
0.0071
0.0007
0.0004
0.0016
0.0027
0.0099
0.0282
0.0072
0.0035
0.0047
0.0575
0.0158
0.0071
0.0061
0.0089
0.0116
0.0022
0.0689
0.0043
0.0025
0.0001
0.0004
0.0137
0.0010
0.0014
0.0004
0.0002
0.0038
0.0002
0.0022
PM wgt
0.0011
0.0036
0.0271
0.0036
0.0522
0.0049
0.0060
0.0027
0.1859
0.0260
0.0036
0.0763
0.0060
0.0597
0.0199
0.1809
0.0109
0.0071
0.0007
0.0004
0.0016
0.0027
0.0099
0.0282
0.0072
0.0035
0.0047
0.0575
0.0158
0.0071
0.0061
0.0089
0.0116
0.0022
0.0689
0.0043
0.0025
0.0001
0.0004
0.0137
0.0010
0.0014
0.0004
0.0002
0.0038
0.0002
0.0022
D30

-------
Table D5.
300-600 hp
 Rated HP
   475
   327
   327
   330
   330
   313
   381
   496
 Sales-wgt
    EF
  Sample
   Size
1999 MY Certification Data (cont.)
       Emission Factors (g/hp-hr)
   HC
  0.28
  0.22
  0.24
  0.07
  0.04
  0.27
  0.21
  0.13
NOx
4.09
6.39
6.11
5.07
5.64
6.26
6.55
6.12
CO
0.46
0.46
0.48
0.44
0.40
0.31
0.61
0.28
PM
0.15
0.14
0.13
0.10
0.16
0.06
0.08
0.07
HCwgt
0.0022
0.0022
0.0022
0.0036
0.0116
0.0134
0.0186
0.0016
0.201521  6.049760  1.201752  0.192703   1.0000
 Sales Weightings
NOx wgt   CO wgt
 0.0022
 0.0022
 0.0022
 0.0036
 0.0116
 0.0134
 0.0186
 0.0016
0.0022
0.0022
0.0022
0.0036
0.0116
0.0134
0.0186
0.0016
                                       1.0000     1.0000
PM wgt
0.0022
0.0022
0.0022
0.0036
0.0116
0.0134
0.0186
0.0016
1.0000
   55
 55
 55
 55
Table D5.
600-750 hp
Rated HP
660
740
640
730
740
600
686
750
750
750
750
641
740
Sales-wgt
EF
Sample
Size
1999 MY
Certification Data (cont.)
Emission Factors (g/hp-hr)
HC
0.05
0.05
0.11
0.06
0.10
0.26
0.20
0.07
0.07
0.06
0.35
0.26
0.24
0.118392
13
NOx
6.24
5.68
5.62
5.04
5.53
6.02
5.70
5.84
5.90
4.48
5.80
5.84
5.85
5.723896
13
CO
0.83
1.57
0.83
0.99
1.62
1.78
0.65
0.90
1.29
1.43
1.48
0.83
1.37
1.361031
13
PM
0.14
0.25
0.19
0.19
0.33
0.24
0.30
0.16
0.22
0.24
0.30
0.18
0.28
0.227162
13
HCwgt
0.1765
0.2857
0.0071
0.0903
0.0429
0.1618
0.0139
0.0113
0.0588
0.0597
0.0828
0.0046
0.0046
1.0000

Sales Weightings
NOx wgt
0.1765
0.2857
0.0071
0.0903
0.0429
0.1618
0.0139
0.0113
0.0588
0.0597
0.0828
0.0046
0.0046
1.0000

CO wgt
0.1765
0.2857
0.0071
0.0903
0.0429
0.1618
0.0139
0.0113
0.0588
0.0597
0.0828
0.0046
0.0046
1.0000

PM wgt
0.1765
0.2857
0.0071
0.0903
0.0429
0.1618
0.0139
0.0113
0.0588
0.0597
0.0828
0.0046
0.0046
1.0000

                                          D31

-------
Table D6. 2000 MY Certification Data
0-1 1 hp Emission Factors (g/hp-hr)
Rated HP HC NOx HC+NOx CO
6 6.57 7.33 4.20
6 5.28
10
7
7
11
10
7
8
10
4 0.78 5.18
7 0.71 4.82
8 0.58 5.74
11 0.57 5.10
4
7
10
7
10
9
Sales-wgt 06921Q3 517Q337
Sample
Size
CalcHC* 0.675351
NOx*
7.78
3.36
3.82
3.77
5.45
5.23
6.54
5.76
5.03
5.96
5.53
6.32
5.67
6.61
6.25
6.30
6.57
3.72
3.88
5.966223
20


3.16
1.04
2.11
2.95
4.10
1.68
3.81
4.50
4.21
3.93
3.83
3.29
3.18
5.00
5.03
3.84
3.61
1.91
3.84
4.051366
20


PM
0.07
0.12
0.28
0.35
0.33
0.24
0.21
0.43
0.52
0.42
0.66
0.57
0.45
0.54
0.50
0.49
0.39
0.48
0.35
0.33
0.452858
20


HCfracof HCwgt
HC+NOx*
0.0000
0
0
0
0
0
0
0
0
0
0.131414 0
0.128205 0
0.091981 0
0.101183 0
0
0
0
0
0
0
1
0.113196


.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.1309
.6675
.1309
.0706
.0000
.0000
.0000
.0000
.0000
.0000
.0000



Sales Weightings
NOxwgt HC+NOx COwgt
wgt
0.1007 0.0289 0.0289
0.0280
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1141
0.5817
0.1141
0.0615
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1



.0080
.0088
.0096
.0225
.0096
.0193
.0123
.0006
.0006
.0328
.1672
.0328
.0177
.2089
.1607
.1832
.0164
.0501
.0096
.0000



0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1



.0080
.0088
.0096
.0225
.0096
.0193
.0123
.0006
.0006
.0328
.1672
.0328
.0177
.2089
.1607
.1832
.0164
.0501
.0096
.0000



PM wgt
0.0289
0.0080
0.0088
0.0096
0.0225
0.0096
0.0193
0.0123
0.0006
0.0006
0.0328
0.1672
0.0328
0.0177
0.2089
0.1607
0.1832
0.0164
0.0501
0.0096
1.0000



* HC fraction of HC+NOx = HC + (HC+NOx). The average HC fraction is not a sales-weighted average.
Calculated HC = ( avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                            D32

-------
Table D6. 2000 MY Certification Data
11-25hp Emission Factors (g/hp-hr)
Rated HP HC NOx HC+NOx CO

19
17 0.58
25 0.45
21
17
18
23
11
17
12
18
21
24
24
25
19
18 0.17
17 0.10
25 0.11
12
23
22
20
16
19
21
18
21
15 0.72
15 0.43
16 0.57
22 0.77
12
16
12
19
22
24
17
18
Sale*wgt 048gg83
Sample Q
Size 3
CalcHC* 0.401631
Calc NOx*

5
3.79 4
4.07 4
4
5
5
3
4
4
5
1.10 4
3
3
5
6
3
5.59 5
3.48 3
3.38 3
5
4
4
5
4
6
4
5
4
5.29 6
5.70 6
5.62 6
5.17 5
5
4
3
4
3
5
4
3

.02
.37
.52
.30
.26
.15
.98
.88
.38
.54
.96
.68
.54
.67
.45
.40
.76
.58
.49
.53
.30
.66
.66
.02
.24
.30
.97
.10
.02
.12
.19
.94
.03
.46
.17
.29
.47
.63
.88
.24
3.749647 4.948900
10 40

4.547269



1
3
3
1
1
0
1
1
2
2

1
1
1
1
0
0
0
0
2
1
1
2
3
4
1
2
2
3
2
3
3
2
2
1
1
2
0
1
1

.36
.82
.09
.74
.69
.77
.08
.88
.36
.57

.34
.06
.66
.20
.99
.97
.56
.56
.77
.73
.50
.23
.13
.15
.74
.73
.24
.70
.41
.00
.04
.95
.98
.47
.28
.27
.90
.55
.91
2.207041
39




PM HC frac of
HC+NOx*
0.45
0.57 0.131868
0.38 0.099558
0.24
0.39
0.23
0.26
0.50
0.52
0.33
0.56
0.57
0.30
0.56
0.41
0.37
0.54 0.028849
0.33 0.027933
0.30 0.030399
0.22
0.14
0.12
0.21
0.19
0.43
0.24
0.50
0.35
0.43 0.120198
0.39 0.069428
0.37 0.092771
0.45 0.129397
0.26
0.35
0.30
0.08
0.19
0.25
0.42
0.32
0.289982
40 0.081156


HCwgt

0.0000
0.0373
0.1493
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0033
0.1866
0.0974
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0410
0.0784
0.0187
0.3881
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



Sales Weightings
NOx HC+NOx COwgt
wgt
0.0000
0.0289
0.1156
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.2254
0.0000
0.0000
0.0000
0.0000
0.0000
0.0025
0.1445
0.0754
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0318
0.0607
0.0145
0.3006
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



wgt
0.0030
0.0051
0.0203
0.0005
0.0012
0.0013
0.0034
0.0026
0.0140
0.0081
0.0395
0.0130
0.0020
0.0022
0.0022
0.0028
0.0004
0.0253
0.0132
0.3139
0.0810
0.0253
0.0041
0.0003
0.0223
0.0046
0.0152
0.0101
0.0056
0.0106
0.0025
0.0527
0.0010
0.0450
0.0505
0.0284
0.0374
0.0837
0.0398
0.0061
1.0000




0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
1.




.0032
.0053
.0211
.0005
.0012
.0014
.0035
.0027
.0146
.0084
.0000
.0135
.0021
.0023
.0023
.0029
.0005
.0264
.0138
.3268
.0843
.0264
.0042
.0003
.0232
.0047
.0158
.0105
.0058
.0111
.0026
.0548
.0011
.0468
.0526
.0295
.0390
.0872
.0414
.0063
.0000



PM wgt

0.0030
0.0051
0.0203
0.0005
0.0012
0.0013
0.0034
0.0026
0.0140
0.0081
0.0395
0.0130
0.0020
0.0022
0.0022
0.0028
0.0004
0.0253
0.0132
0.3139
0.0810
0.0253
0.0041
0.0003
0.0223
0.0046
0.0152
0.0101
0.0056
0.0106
0.0025
0.0527
0.0010
0.0450
0.0505
0.0284
0.0374
0.0837
0.0398
0.0061
1.0000



D33

-------
* HC fraction of HC+NOx = HC + (HC+NOx). The average HC fraction is not a sales-weighted average.
Calculated HC = ( avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                            D34

-------
Table D6. 2000 MY Certification Data (cont.)
25-50 hp
Rated HP HC
Emission Factors (g/hp-hr)
NOx HC+NOx
CO
PM
HC frac of
HCwgt
HC+NOx*
42
25
28
34
45
36
38
30
50
30
38
46
35
39
47
25
28
30
40
47
26
27
29
40
45
28
39
28 0.13
37 0.16
37 0.67
27 0.11
27 0.09
37 0.85
35 0.08
40 0.69
35 0.56
46 0.04
34 0.14
47 0.12
48 0.64
38
26
31
42
26
41
6
5
4
5
5
3
3
2
6.14
6
6
6
5
6
5
4
3
3
4
3
3
5
4
2
4
3
4
4.23 4
3.56 3
6.00 6
4.52 4
3.95 4
4.85 5
4.56 4
6.19 6
4.54 5
3.75 3
3.66 3
6.71 6
6.36 7
6
4
3
3
4
4
.52
.31
.92
.21
.95
.12
.62
.79

.94
.69
.65
.68
.58
.84
.35
.76
.86
.50
.38
.18
.66
.11
.78
.04
.57
.35
.36
.72
.67
.63
.04
.56
.64
.88
.10
.79
.80
.83
.00
.16
.64
.80
.84
.46
.81
3.35
1.49
1.56
1.44
0.48
1.31
2.13
3.06

1.64
1.92
2.29
1.74
1.84
1.35
0.64
1.24
0.83
0.62
0.87
0.98
1.62
1.16
1.62
0.87
2.65
1.89
1.33
2.30
3.55
0.57
0.82
2.55
0.90
1.62
1.52
0.68
0.98
0.74
1.46
1.66
1.30
1.16
0.77
0.96
0.75
0.42
0.50
0.54
0.38
0.26
0.39
0.51
0.46

0.27
0.32
0.35
0.21
0.11
0.09
0.13
0.20
0.17
0.20
0.27
0.37
0.56
0.35
0.42
0.38
0.43
0.45
0.54
0.58
0.42
0.31
0.46
0.38
0.40
0.25
0.48
0.33
0.50
0.30
0.31
0.41
0.28
0.36
0.24
0.35
0.25



























0.
0.
0
0.
0.
0.
0.
0.
0.
0.
0.
0
0.

































029817
041678
.10051
023758
021308
149123
017234
100291
109804
010554
036842
.01757
091429






0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0267
0.0595
0.0017
0.0017
0.0278
0.0076
0.0216
0.0056
0.7065
0.0014
0.0734
0.0050
0.0151
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Sales Weightings
NOx
wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1584
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0167
0.0372
0.0010
0.0010
0.0173
0.0047
0.0135
0.0035
0.4409
0.0009
0.0458
0.0031
0.0094
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
HC+NOx
wgt
0.0025
0.0005
0.0022
0.0069
0.0007
0.0007
0.0033
0.0004
0.0000
0.0390
0.0133
0.0123
0.0036
0.0051
0.0044
0.0004
0.0022
0.0030
0.0013
0.0005
0.0004
0.0001
0.0160
0.0379
0.0147
0.0010
0.0004
0.0019
0.0043
0.0001
0.0001
0.0020
0.0005
0.0016
0.0004
0.0509
0.0001
0.0053
0.0004
0.0011
0.0363
0.0076
0.0400
0.0073
0.0545
0.0009
CO wgt

0.0025
0.0005
0.0022
0.0069
0.0007
0.0007
0.0033
0.0004
0.0000
0.0390
0.0133
0.0123
0.0036
0.0051
0.0044
0.0004
0.0022
0.0030
0.0013
0.0005
0.0004
0.0001
0.0159
0.0379
0.0147
0.0010
0.0004
0.0019
0.0043
0.0001
0.0001
0.0020
0.0005
0.0016
0.0004
0.0509
0.0001
0.0053
0.0004
0.0011
0.0363
0.0076
0.0400
0.0073
0.0545
0.0009
PM wgt

0.0025
0.0005
0.0022
0.0069
0.0007
0.0007
0.0033
0.0004
0.0000
0.0390
0.0133
0.0123
0.0036
0.0051
0.0044
0.0004
0.0022
0.0030
0.0013
0.0005
0.0004
0.0001
0.0159
0.0379
0.0147
0.0010
0.0004
0.0019
0.0043
0.0001
0.0001
0.0020
0.0005
0.0016
0.0004
0.0509
0.0001
0.0053
0.0004
0.0011
0.0363
0.0076
0.0400
0.0073
0.0545
0.0009
D35

-------
Table D6. 2000 MY Certification Data (cont.)
25-50 hp
Rated HP    HC

   31
   31
   37
   49
   38
   48
   40      0.18
   30
   38
   26
   25
   33
   36
   30
   35
   40
   42
   44
   40
   38
   30
   42
   39
   45
   49
   44
   47
   43
   41
   48
   26
   28
   25
   30
   25
   33
   41
   29
   37
   25
   37
   25
   30
   45
   38
   48
Emission Factors (g/hp-hr)
NOx







4.99





5.73

5.15
4.62

4.82








5.32

6.35

















HC+NOx

5
5
4
5
5
4
5
2
3
2
5
2
6
5
5
5
6
5
6
6
6
6
4
5
4
6
5
6

6
5
5
5
5
5
5
5
5
6
6
6
6
6
5
5
6

.27
.11
.47
.95
.99
.63
.17
.79
.62
.62
.78
.37
.06
.29
.48
.53
.35
.56
.36
.00
.51
.07
.73
.62
.09
.19
.81
.35

.25
.45
.78
.53
.82
.91
.76
.97
.82
.76
.01
.03
.09
.07
.85
.79
.00
CO

0.74
0.80
0.80
1.93
1.58
0.93
0.94
3.06
2.13
1.83
3.66
1.58
1.07
1.50
1.61
2.57
1.01
1.69
1.33
1.25
3.22
0.70
1.01
1.30
0.80
1.09
2.45
2.33
0.95
1.59
2.00
3.61
2.91
2.93
3.45
2.74
1.35
2.82
1.71
3.03
2.59
3.03
3.01
3.21
3.23
1.56
PM

0.19
0.26
0.29
0.43
0.36
0.23
0.48
0.46
0.51
0.25
0.43
0.53
0.33
0.33
0.36
0.22
0.13
0.34
0.33
0.36
0.50
0.31
0.34
0.38
0.25
0.53
0.44
0.26
0.32
0.28
0.15
0.40
0.37
0.35
0.24
0.28
0.49
0.25
0.40
0.32
0.35
0.20
0.38
0.45
0.39
0.44
HCfracof HC wgt
HC+NOx*
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.034632 0.0465
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000


0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Sales Weightings
NOx
wgt
.0000
.0000
.0000
.0000
.0000
.0000
.0290
.0000
.0000
.0000
.0000
.0000
.0441
.0000
.0157
.0236
.0000
.0157
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0693
.0000
.0055
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
HC+NOx
wgt
0.0309
0.0582
0.2108
0.0018
0.0018
0.0031
0.0033
0.0011
0.0003
0.0001
0.0029
0.0013
0.0051
0.0002
0.0018
0.0027
0.0001
0.0018
0.0015
0.0004
0.0038
0.0004
0.0138
0.0016
0.0038
0.0016
0.0080
0.0004
0.0000
0.0002
0.0236
0.0096
0.0129
0.0012
0.0006
0.0230
0.0009
0.0070
0.0007
0.0222
0.0181
0.0000
0.0117
0.0291
0.0027
0.0000
CO wgt

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

.0309
.0581
.2107
.0018
.0018
.0031
.0033
.0011
.0003
.0001
.0029
.0013
.0051
.0002
.0018
.0027
.0001
.0018
.0015
.0004
.0038
.0004
.0138
.0016
.0038
.0016
.0080
.0004
.0006
.0002
.0236
.0096
.0129
.0012
.0006
.0230
.0009
.0070
.0007
.0222
.0181
.0000
.0117
.0291
.0027
.0000
PM wgt

0.0309
0.0581
0.2107
0.0018
0.0018
0.0031
0.0033
0.0011
0.0003
0.0001
0.0029
0.0013
0.0051
0.0002
0.0018
0.0027
0.0001
0.0018
0.0015
0.0004
0.0038
0.0004
0.0138
0.0016
0.0038
0.0016
0.0080
0.0004
0.0006
0.0002
0.0236
0.0096
0.0129
0.0012
0.0006
0.0230
0.0009
0.0070
0.0007
0.0222
0.0181
0.0000
0.0117
0.0291
0.0027
0.0000
                                            D36

-------
Table D6. 2000 MY Certification Data (cont.)
25-50 hp
Rated HP HC
34
50
46
41
27
39
Sales-wgt Q452946
Sample
Size 14
CalcHC* 0.284899
Calc NOx*
Emission Factors (g/hp-hr)
NOx HC+NOx CO
5.94 1.87
4.85
6.01
5.76
3.04
5.53
4.893606 5.083919
22 95

4.799020

2.54
2.79
0.98
1.96
1. 522782
96


PM HC frac of
HC+NOx*
0.34

0.20
0.33
0.40
0.26
0.331337
96 0.056039


HCwgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000



Sales Weightings
NOx HC+NOx COwgt
wgt wgt
0.0000 0.0715 0.0715
0.0435
0.0000
0.0000
0.0000
0.0000
1.0000



0.0000
0.0064
0.0042
0.0023
0.0010
1.0000



0.0000
0.0064
0.0042
0.0023
0.0010
1.0000



PM wgt
0.0715
0.0000
0.0064
0.0042
0.0023
0.0010
1.0000



      * HC fraction of HC+NOx = HC + (HC+NOx). The average HC fraction is not a sales-weighted average.
      Calculated HC = ( avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
      Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                                  D37

-------
Table D6.  2000 MY Certification Data (cont.)
50-100 hp       Emission Factors (g/hp-hr)
Rated HP  HC   NOx  HC+NOx
67
79
96
80
67
75
85
56
75
98
62
57
55
64
82
53
83
65
84
68
51
56
78
52
50
52
51
54
51
55
64
76
51
56
83
91
79
86
86
53
51
78
74
80
98
56



0.48
0.75
0.70
0.48
0.46
0.70
0.71















0.17
1.44
0.69
0.60
0.39
0.43
0.29
0.41
0.48
0.49
0.42
0.55
0.46
0.35

0.05
0.49
0.76
0.72
0.71
0.46
6.40
5.74
5.81
7.61
6.35
5.68
6.14
5.71
5.68
6.30
6.23
6.20
5.80
5.92
5.23
6.32
6.47
6.20
6.79
6.70
5.38
5.21
6.22
4.59
3.43
5.22
5.79
4.15
6.68
6.16
5.62
5.35
5.34
4.88
4.80
6.63
5.25
4.98
5.09
6.56
3.56
3.77
4.70
5.78
6.30
5.71
/hp-hr)
CO




4.32
1.96
2.28
1.03
2.19
2.28
1.68















1.18
3.90
1.45
3.04
0.98
2.17
1.08
2.22
0.46
0.76
1.32
2.47
0.83
0.67

0.75
3.00
2.06
3.26
1.68
2.19
PM




0.56
0.34
0.49
0.35
0.29
0.49
0.21















0.45
0.38
0.36
0.63
0.28
0.60
0.51
0.64
0.27
0.34
0.54
0.55
0.38
0.21

0.20
0.52
0.32
0.51
0.21
0.29
HCwgt

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

.0000
.0000
.0000
.1534
.0219
.1315
.0418
.0418
.0279
.0005
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0094
.0110
.0240
.0011
.0163
.0076
.0149
.0087
.0014
.0099
.0378
.0335
.0013
.0013
.0000
.0159
.0159
.0199
.0060
.0050
.0002
Sales Weightings
NOx HC+NOx COwgt
wgt
0.0035
0.0015
0.0005
0.0381
0.0054
0.0327
0.0104
0.0104
0.0069
0.0001
0.0010
0.0010
0.0010
0.0049
0.0802
0.0217
0.0029
0.0174
0.0000
0.0030
0.0015
0.0042
0.0001
0.0188
0.0079
0.0023
0.0027
0.0060
0.0003
0.0041
0.0019
0.0037
0.0022
0.0003
0.0025
0.0094
0.0083
0.0003
0.0003
0.0478
0.0040
0.0040
0.0050
0.0015
0.0012
0.0001

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
wgt
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000

0.0000
0.0000
0.0000
0.1520
0.0217
0.1303
0.0415
0.0415
0.0276
0.0005
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0093
0.0109
0.0238
0.0011
0.0162
0.0075
0.0148
0.0086
0.0014
0.0098
0.0375
0.0332
0.0013
0.0013
0.0000
0.0158
0.0158
0.0197
0.0059
0.0049
0.0002
PM wgt

0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.

.0000
.0000
.0000
.1572
.0225
.1348
.0429
.0429
.0286
.0005
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0096
.0112
.0246
.0011
.0167
.0078
.0153
.0089
.0014
.0101
.0388
.0344
.0013
.0014
.0000
.0163
.0163
.0204
.0061
.0051
.0002
                                       D38

-------
Table D6. 2000 MY Certification Data (cont.)
50-100 hp       Emission Factors (g/hp-hr)
Rated HP  HC    NOx   HC+NOx
85
59
51
56
89
73
86
93
72
54
65
59
53
56
54
63
57
55
51
87
52
89
67
92
55
59
85
64
79
58
52
64
60
96
68
52
68
80
80
59
84
94
50
77
59
100
0.48 6.14
4.37
5.12
4.18
3.57
3.68
5.42
4.71
4.31
0.54 6.31
0.05 4.18
3.34
4.60
5.95
2.62
5.06
4.46
2.91
5.35
5.92
6.32
6.40
0.22 5.71
0.35 6.16
2.62
5.90
2.18
5.58
6.16
3.23
6.62
5.13
6.06
5.09
5.85
5.97
6.11
0.83 6.00
0.86 5.40
3.58
6.14
5.75
5.80
0.03 3.55
5.59
6.27
                        4.24
/hp-hr)
CO

1.03








2.42
0.90











1.01
1.22













3.19
4.00



1.78
0.15
0.96
0.87
PM HC wgt

0.35 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.54 0
0.29 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.63 0
0.64 0
0
0
0
0.38 0
0.18 0
0.45 0
0.33 0

.0002
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0157
.0178
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.1915
.0992
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0060
.0075
.0000
.0000
.0000
.0000
.0021
.0000
.0000
Sales Weightings
NOx HC+NOx CO wgt
wgt
0.0001
0.0119
0.0005
0.0114
0.0178
0.0124
0.0104
0.0114
0.0054
0.0039
0.0044
0.0003
0.0015
0.0005
0.0048
0.0006
0.0052
0.0014
0.0154
0.0154
0.0050
0.0025
0.0476
0.0247
0.0012
0.0012
0.0013
0.0124
0.0067
0.0109
0.0097
0.0045
0.0258
0.1312
0.0669
0.0421
0.0099
0.0015
0.0019
0.0030
0.0010
0.0003
0.0008
0.0005
0.0010
0.0004

0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
wgt
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000

0.0002
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0156
0.0177
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.1898
0.0983
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0059
0.0074
0.0000
0.0000
0.0000
0.0034
0.0021
0.0040
0.0015
PM wgt

0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.

.0002
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.1963
.1017
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0061
.0077
.0000
.0000
.0000
.0035
.0021
.0042
.0015
                                        D39

-------
Table D6. 2000 MY Certification Data (cont.)
50-100 hp        Emission Factors (g/hp-hr)
Rated HP   HC    NOx  HC+NOx  CO    PM
75
58
54
67
80
56
58
60
70
58
95
100
Sales-wgt „ 4628g
Sample .,
Size 35
3.87
3.91
5.40
4.89
4.80
5.23
5.12
4.12
5.59
5.72
5.10
5.73
5.494892
104
Sales Weightings
HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
NOx
wgt
0.0015
0.0020
0.0001
0.0163
0.0005
0.0016
0.0157
0.0025
0.0138
0.0002
0.0030
0.0114
HC+NOx
wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
PM wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
                        4.235576  2.04706  0.46043  1.0000   1.0000   1.0000   1.0000  1.0000
                                  38
36
                                         D40

-------
Table D6.
100-1 75 hp
Rated HP
173
108
143
100
125
118
155
110
165
166
125
118
144
109
133
168
155
109
157
121
134
103
153
164
139
144
100
125
155
125
103
151
120
144
118
113
132
173
108
116
168
118
120
103
172
115
152
2000 MY
Certification
Data
(cont.)

Emission Factors (g/hp-hr)
HC
0.33


0.35
0.23
0.25
0.38



0.23
0.25



0.11



0.49
0.34
0.57
0.51
0.47
0.52

0.35
0.23
0.38









0.16
0.57
0.42



0.13


NOx
6.37
6.47
6.09
6.08
6.21
4.53
4.23
6.06
6.24
4.95
6.21
4.53
4.97
6.41
6.50
6.17
6.39
6.32
6.65
4.30
4.30
6.26
5.65
4.67
4.30
6.61
6.08
6.21
4.23
5.74
5.94
5.60
5.50
5.80
5.52
4.41
6.05
5.79
6.25
6.43
5.85
6.30
5.55
6.19
5.31
5.77
5.82
CO
0.78


0.70
0.47
0.54
0.75



0.47
0.54



0.63

0.53

1.23
1.00
1.58
0.49
1.06
1.25

0.70
0.47
0.75









0.43
1.45
0.76



0.45


PM
0.11


0.28
0.16
0.22
0.35



0.16
0.22



0.13

0.13

0.28
0.24
0.39
0.26
0.23
0.19

0.28
0.16
0.35









0.26
0.33
0.27



0.25


HCwgt
0.0006
0.0000
0.0000
0.2138
0.0077
0.0165
0.1983
0.0000
0.0000
0.0000
0.1202
0.0165
0.0000
0.0000
0.0000
0.0009
0.0000
0.0000
0.0000
0.0013
0.0007
0.0127
0.0145
0.0033
0.0012
0.0000
0.0881
0.0220
0.1102
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0759
0.0150
0.0382
0.0000
0.0000
0.0000
0.0180
0.0000
0.0000
Sales Weightings
HCwgt
0.0006
0.0000
0.0000
0.2138
0.0077
0.0165
0.1983
0.0000
0.0000
0.0000
0.1202
0.0165
0.0000
0.0000
0.0000
0.0009
0.0000
0.0000
0.0000
0.0013
0.0007
0.0127
0.0145
0.0033
0.0012
0.0000
0.0881
0.0220
0.1102
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0759
0.0150
0.0382
0.0000
0.0000
0.0000
0.0180
0.0000
0.0000
NOx wgt
0.0004
0.0007
0.0001
0.1425
0.0051
0.0110
0.1322
0.0019
0.0495
0.0040
0.0801
0.0110
0.0026
0.0026
0.0026
0.0006
0.0170
0.0000
0.0116
0.0009
0.0004
0.0085
0.0097
0.0022
0.0008
0.0001
0.0588
0.0147
0.0735
0.0134
0.0005
0.0005
0.0414
0.0494
0.0009
0.0060
0.0067
0.0027
0.0506
0.0100
0.0255
0.0008
0.0287
0.0089
0.0120
0.0067
0.0601
CO wgt
0.0006
0.0000
0.0000
0.2133
0.0077
0.0165
0.1979
0.0000
0.0000
0.0000
0.1200
0.0165
0.0000
0.0000
0.0000
0.0009
0.0000
0.0000
0.0000
0.0013
0.0007
0.0127
0.0145
0.0033
0.0012
0.0000
0.0880
0.0220
0.1100
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0757
0.0150
0.0381
0.0000
0.0000
0.0000
0.0180
0.0000
0.0000
PM wgt
0.0006
0.0000
0.0000
0.2164
0.0078
0.0167
0.2008
0.0000
0.0000
0.0000
0.1217
0.0167
0.0000
0.0000
0.0000
0.0009
0.0000
0.0000
0.0000
0.0013
0.0007
0.0129
0.0147
0.0033
0.0012
0.0000
0.0892
0.0223
0.1115
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0768
0.0152
0.0387
0.0000
0.0000
0.0000
0.0183
0.0000
0.0000
D41

-------
Table D6. 2000 MY Certification Data (cont.)
100-1 75 hp
Rated HP
103
135
130
100
114
127
117
172
173
142
138
161
130
116
Sales-wgt
EF
Sample
Size
Emission Factors (g/hp-hr)
HC NOx CO PM
0.53 5.30 1.24 0.51
0.45
0.63
0.57




0.54


0.23


0.332460
27
6.68
6.61
5.50
6.39
5.38
6.23
6.23
6.57
5.92
6.68
5.96
5.05
5.82
5.593736
61
0.92
1.21
1.35




1.83
1.33

0.83


0.685810
29
0.24
0.36
0.47




0.42
0.23




0.282059
28
HCwgt
0.0023
0.0010
0.0017
0.0031
0.0000
0.0000
0.0000
0.0000
0.0020
0.0000
0.0000
0.0141
0.0000
0.0000
1.0000

Sales Weightings
NOx wgt CO wgt
0.0015 0.0023
0.0007
0.0011
0.0021
0.0040
0.0013
0.0013
0.0040
0.0013
0.0013
0.0014
0.0094
0.0002
0.0003
1.0000

0.0010
0.0017
0.0031
0.0000
0.0000
0.0000
0.0000
0.0020
0.0020
0.0000
0.0141
0.0000
0.0000
1.0000

PM wgt
0.0023
0.0010
0.0017
0.0031
0.0000
0.0000
0.0000
0.0000
0.0020
0.0020
0.0000
0.0000
0.0000
0.0000
1.0000

                                       D42

-------
Table D6. 2000 MY Certification Data (cont.)
1 75-300 hp
Rated HP

257
200
240
215
260
240
280
210
275
205
255
290
260
225
240
200
189
240
200
296
261
248
275
196
184
186
249
243
185
241
241
227
193
200
189
215
240
280
189
252
238
244
285
197
251
184
Emission Factors (g/hp-hr)
HC

0.43
0.26
0.10
0.32
0.44
0.29
0.47
0.20
0.11
0.19
0.08
0.09
0.36
0.41
0.10
0.26
0.33
0.29
0.25
0.31
0.47
0.34
0.14
0.35
0.24
0.34
0.48
0.40
0.54
0.21
0.41
0.51
0.60
0.26
0.33
0.32
0.29
0.47
0.31
0.22
0.21
0.39
0.06
0.33
0.23
0.30
NOx HC+NOx

6.43
5.13
5.06
5.51
5.82
5.38
5.47
5.89
4.56
5.96
6.20
5.46
5.73
5.70
5.06
5.13
3.95
5.38
5.43
6.41
6.06
5.31
5.38
6.52
5.84
6.28
6.37
5.88
4.19 4.73
4.14 4.35
6.44
6.72
6.69
5.13
3.95
5.51
5.38
5.47
5.40
6.23
5.95
6.24
5.93
5.07
5.59
6.70
CO

0.76
0.60
0.38
0.55
0.70
0.49
0.52
1.49
1.26
1.73
0.96
2.19
1.30
0.84
0.38
0.60
0.54
0.49
1.23
0.96
0.89
1.04
0.48
0.95
0.69
0.69
1.08
1.67
0.93
0.67
1.11
1.07
0.85
0.60
0.54
0.55
0.49
0.52
0.92
0.30
0.51
0.74
0.60
0.76
0.42
0.61
PM

0.20
0.22
0.15
0.32
0.27
0.27
0.23
0.33
0.26
0.25
0.29
0.35
0.39
0.22
0.15
0.22
0.20
0.27
0.35
0.25
0.27
0.35
0.14
0.36
0.15
0.23
0.24
0.37
0.20
0.17
0.34
0.33
0.21
0.22
0.20
0.32
0.27
0.23
0.21
0.23
0.19
0.18
0.09
0.18
0.11
0.18
HCwgt

0.0005
0.0678
0.0136
0.0329
0.0213
0.0213
0.0484
0.0362
0.0027
0.0096
0.0252
0.0097
0.0022
0.0588
0.0968
0.1355
0.0039
0.1936
0.0034
0.0034
0.0002
0.0002
0.0014
0.0037
0.0215
0.0017
0.0001
0.0002
0.0004
0.0004
0.0024
0.0055
0.0010
0.0194
0.0039
0.0194
0.0116
0.0020
0.0014
0.0092
0.0006
0.0011
0.0009
0.0044
0.0072
0.0023
Sales Weightings
NOx wgt

0.0005
0.0678
0.0136
0.0329
0.0213
0.0213
0.0484
0.0362
0.0027
0.0096
0.0252
0.0097
0.0022
0.0588
0.0968
0.1355
0.0039
0.1936
0.0034
0.0034
0.0002
0.0002
0.0014
0.0037
0.0215
0.0017
0.0001
0.0002
0.0004
0.0004
0.0024
0.0055
0.0010
0.0194
0.0039
0.0194
0.0116
0.0020
0.0014
0.0092
0.0006
0.0011
0.0009
0.0044
0.0072
0.0023
HC+NOx
wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.5000
0.5000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt

0.0005
0.0678
0.0136
0.0329
0.0213
0.0213
0.0484
0.0362
0.0027
0.0096
0.0252
0.0097
0.0022
0.0588
0.0968
0.1355
0.0039
0.1936
0.0034
0.0034
0.0002
0.0002
0.0014
0.0037
0.0215
0.0017
0.0001
0.0002
0.0004
0.0004
0.0024
0.0055
0.0010
0.0194
0.0039
0.0194
0.0116
0.0020
0.0014
0.0092
0.0006
0.0011
0.0009
0.0044
0.0072
0.0023
PM wgt

0.0005
0.0678
0.0136
0.0329
0.0213
0.0213
0.0484
0.0362
0.0027
0.0096
0.0252
0.0097
0.0022
0.0588
0.0968
0.1355
0.0039
0.1936
0.0034
0.0034
0.0002
0.0002
0.0014
0.0037
0.0215
0.0017
0.0001
0.0002
0.0004
0.0004
0.0024
0.0055
0.0010
0.0194
0.0039
0.0194
0.0116
0.0020
0.0014
0.0092
0.0006
0.0011
0.0009
0.0044
0.0072
0.0023
D43

-------
Table D6. 2000 MY Certification Data (cont.)
175-300 hp          Emission Factors (g/hp-hr)
 Rated HP   HC    NOx    HC+NOx
280
298
212
210
225
286
181
202
190
177
182
207
217
183
227
244
272
255
Sales-wgt
EF
Sample
Size
0.19
0.37
0.29
0.09
0.09
0.22
0.15
0.38
0.66
0.34
0.42
0.44
0.36
0.54
0.35
0.19
0.35
0.25
0.266310
64
5.68
6.32
6.41
5.16
6.78
5.35
5.69
8.06
6.08
6.20
6.43
6.59
5.49
6.63
6.34
6.30
6.44
5.89
5.441729
64
ip-hr) Sales Weightings
CO

0.51
1.16
0.40
0.90
0.40
1.24
0.44
1.42
1.56
0.89
0.87
1.15
1.00
0.81
0.51
1.66
1.09
0.40
PM

0.18
0.30
0.14
0.18
0.16
0.38
0.27
0.42
0.40
0.28
0.30
0.37
0.22
0.34
0.27
0.36
0.23
0.13
HCwgt

0.0039
0.0029
0.0035
0.0070
0.0058
0.0304
0.0127
0.0009
0.0007
0.0026
0.0009
0.0009
0.0018
0.0009
0.0009
0.0035
0.0035
0.0087
NOx wgt

0.0039
0.0029
0.0035
0.0070
0.0058
0.0304
0.0127
0.0009
0.0007
0.0026
0.0009
0.0009
0.0018
0.0009
0.0009
0.0035
0.0035
0.0087
HC+NOx
wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt

0.0039
0.0029
0.0035
0.0070
0.0058
0.0304
0.0127
0.0009
0.0007
0.0026
0.0009
0.0009
0.0018
0.0009
0.0009
0.0035
0.0035
0.0087
PM wgt

0.0039
0.0029
0.0035
0.0070
0.0058
0.0304
0.0127
0.0009
0.0007
0.0026
0.0009
0.0009
0.0018
0.0009
0.0009
0.0035
0.0035
0.0087
                            4.540000  0.666725 0.240685   1.0000    1.0000    1.0000   1.0000  1.0000
                                        64
64
                                              D44

-------
Table D6. 2000 MY Certification Data (cont.)
300-600 hp          Emission Factors (g/hp-hr)
 Rated HP    HC     NOx   HC+NOx
310
415
496
340
300
395
300
330
397
362
322
455
599
535
350
430
525
440
336
422
449
308
335
563
543
305
325
315
329
590
335
306
326
493
493
334
322
375
525
330
571
475
542
327
327
460
0.34
0.10
0.13
0.12
0.08
0.51
0.28
0.33
0.19
0.16
0.15
0.12
0.04
0.08
0.22
0.14
0.16
0.11
0.14
0.15
0.14
0.28
0.27
0.14
0.22
0.09
0.10
0.28
0.24
0.34
0.26
0.24
0.50
0.16
0.16
0.25
0.23
0.22
0.17
0.21
0.31
0.28
0.32
0.22
0.24
0.19
5.48
4.65
6.12
3.91
5.78
6.48
6.13
5.28
4.65
5.49
3.98
5.48
6.59
5.79
6.52
6.29
6.52
6.38
5.48
4.97
5.10
5.68
5.51
5.11
5.66
6.00
6.51
5.20
6.60
6.40
6.17
6.29
4.04
4.26
5.89
5.58
3.99
5.72
6.06
6.39
3.98
4.09
3.80
6.39
6.11
3.35
                            5.24
ip-hr)
CO

0.79
0.40
0.28
0.56
0.43
2.14
0.81
1.07
1.35
1.57
0.75
0.82
2.67
2.10
1.17
0.34
0.65
0.35
0.45
0.40
0.50
0.45
0.74
0.40
0.54
0.99
0.51
0.70
0.84
0.72
1.05
0.72
0.43
1.04
0.95
0.31
0.41
0.32
0.60
0.44
0.48
0.46
0.56
0.46
0.48
0.33
Sales Weightings
PM

0.13
0.08
0.07
0.17
0.13
0.16
0.36
0.36
0.19
0.21
0.19
0.17
0.33
0.34
0.20
0.13
0.16
0.13
0.15
0.11
0.15
0.20
0.28
0.11
0.25
0.13
0.13
0.17
0.17
0.23
0.32
0.37
0.14
0.22
0.28
0.18
0.20
0.20
0.23
0.20
0.17
0.15
0.19
0.14
0.13
0.05
HCwgt

0.0016
0.0053
0.0011
0.0395
0.0053
0.0759
0.0071
0.0087
0.0039
0.2706
0.0379
0.0053
0.1111
0.0087
0.0869
0.0290
0.0158
0.0200
0.0103
0.0003
0.0005
0.0021
0.0006
0.0016
0.0116
0.0104
0.0235
0.0358
0.0037
0.0001
0.0003
0.0145
0.0048
0.0029
0.0006
0.0284
0.0009
0.0055
0.0047
0.0003
0.0032
0.0032
0.0032
0.0032
0.0032
0.0003
NOx wgt

0.0029
0.0030
0.0008
0.0253
0.0023
0.2081
0.0107
0.0154
0.0040
0.2327
0.0306
0.0034
0.0239
0.0037
0.1010
0.0221
0.0139
0.0117
0.0077
0.0002
0.0004
0.0031
0.0009
0.0012
0.0139
0.0052
0.0130
0.0545
0.0048
0.0002
0.0004
0.0187
0.0130
0.0025
0.0005
0.0387
0.0011
0.0066
0.0044
0.0004
0.0052
0.0048
0.0054
0.0038
0.0041
0.0003
HC+NOx
wgt
0.0016
0.0053
0.0011
0.0395
0.0053
0.0759
0.0071
0.0087
0.0039
0.2706
0.0379
0.0053
0.1111
0.0087
0.0869
0.0290
0.0158
0.0200
0.0103
0.0003
0.0005
0.0021
0.0006
0.0016
0.0116
0.0104
0.0235
0.0358
0.0037
0.0001
0.0003
0.0145
0.0048
0.0029
0.0006
0.0284
0.0009
0.0055
0.0047
0.0003
0.0032
0.0032
0.0032
0.0032
0.0032
0.0003
CO wgt

0.0015
0.0042
0.0011
0.0267
0.0053
0.0852
0.0075
0.0079
0.0032
0.2574
0.0261
0.0050
0.1268
0.0087
0.0982
0.0316
0.0179
0.0221
0.0097
0.0002
0.0005
0.0021
0.0006
0.0014
0.0114
0.0108
0.0265
0.0322
0.0042
0.0001
0.0003
0.0158
0.0034
0.0021
0.0006
0.0275
0.0006
0.0055
0.0050
0.0004
0.0022
0.0022
0.0021
0.0035
0.0033
0.0002
PM wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
                                            D45

-------
Table D6. 2000 MY Certification Data (cont.)
500-600 hp Emission Factors (g/hp-hr) Sales Weightings
Rated HP HC NOx HC+NOx CO PM HC wgt NOxwgt HC+NOx COwgt PM wgt
wgt
335 0.43 4.29 0.81 0.12 0.0013 0.0029 0.0013 0.0009 0.0000
330 0.05 5.33 0.43 0.21 0.0405 0.0115 0.0405 0.0374 0.0000
313 0.27 6.26 0.31 0.06 0.0148 0.0214 0.0148 0.0161 0.0000
381 0.21 6.55 0.61 0.08 0.0289 0.0324 0.0289 0.0328 0.0000
496 0.13 6.12 0.28 0.07 0.0016 0.0011 0.0016 0.0017 0.0000
Sales-wgt 0186024 5.770260 5.240000 1.254546 0.203148 1.0000 1.0000 1.0000 1.0000 1.0000
S|^P'e 51 51 1 51 51
Table D6. 2000 MY Certification Data (cont.)
600-750 hp
Rated HP
660
740
730
740
600
630
641
740
740
750
750
750
750
684
671
Sales-wgt EF
Sample Size
Emission Factors (g/hp-hr)
HC
0.05
0.05
0.06
0.10
0.26
0.16
0.19
0.24
0.24
0.07
0.08
0.35
0.13
0.19
0.48
0.126821
15
NOx
6.24
5.68
5.04
5.53
6.02
4.46
5.98
5.85
5.85
5.84
6.01
5.80
5.89
5.98
6.63
5.790567
15
CO
0.83
1.57
0.99
1.62
1.78
0.66
1.05
1.37
1.37
0.90
1.92
1.48
1.06
0.68
0.52
1.368105
15
PM
0.14
0.25
0.19
0.33
0.24
0.18
0.23
0.28
0.28
0.16
0.30
0.30
0.13
0.22
0.16
0.225632
15
HCwgt
0.1743
0.2823
0.0892
0.0423
0.1598
0.0249
0.0137
0.0066
0.0066
0.0112
0.0589
0.0818
0.0357
0.0062
0.0062
1.0000

Sales Weightings
NOx wgt
0.1743
0.2823
0.0892
0.0423
0.1598
0.0249
0.0137
0.0066
0.0066
0.0112
0.0589
0.0818
0.0357
0.0062
0.0062
1.0000

COwgt
0.1743
0.2823
0.0892
0.0423
0.1598
0.0249
0.0137
0.0066
0.0066
0.0112
0.0589
0.0818
0.0357
0.0062
0.0062
1.0000

PM wgt
0.1743
0.2823
0.0892
0.0423
0.1598
0.0249
0.0137
0.0066
0.0066
0.0112
0.0589
0.0818
0.0357
0.0062
0.0062
1.0000

                                            D46

-------
Table D6.
>750 hp
Rated HP
800
758
1082
1850
2750
1200
2000
1250
1500
1200
899
1230
1874
1207
1026
2346
Sales-wgt
EF
Sample
Size
2000 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC NOx CO PM
0.03 6.19 0.36 0.10
0.07
0.04
0.16
0.14
0.17
0.31
0.20
0.54
0.17
0.21
0.12
0.38
0.23
0.26
0.40
0.259060
16
5.26
5.96
5.89
6.18
5.17
5.91
6.51
6.24
5.17
6.02
6.03
6.15
5.45
5.07
6.04
6.252638
16
1.07
0.70
1.10
1.31
0.34
1.49
0.51
0.87
0.34
0.53
0.67
1.36
1.26
0.70
1.39
0.727419
16
0.16
0.15
0.31
0.17
0.16
0.25
0.13
0.27
0.16
0.15
0.26
0.15
0.24
0.18
0.26
0.183308
16
HCwgt
0.0321
0.0067
0.0555
0.0658
0.0515
0.0044
0.0297
0.4683
0.2120
0.0297
0.0044
0.0024
0.0059
0.0059
0.0059
0.0198
1.0000

Sales Weightings
NOx wgt CO wgt
0.0321 0.0321
0.0067
0.0555
0.0658
0.0515
0.0044
0.0297
0.4683
0.2120
0.0297
0.0044
0.0024
0.0059
0.0059
0.0059
0.0198
1.0000

0.0067
0.0555
0.0658
0.0515
0.0044
0.0297
0.4683
0.2120
0.0297
0.0044
0.0024
0.0059
0.0059
0.0059
0.0198
1.0000

PM wgt
0.0321
0.0067
0.0555
0.0658
0.0515
0.0044
0.0297
0.4683
0.2120
0.0297
0.0044
0.0024
0.0059
0.0059
0.0059
0.0198
1.0000

D47

-------
Table D7. 2001 MY Certification Data
0-11 hp
Rated HC
HP
9
10
7
7
11
10
7 1.59
8
4 0.78
7 0.71
8 0.58
10
11 0.57
4
7
10
7
10
9
Emission Factors (g/hp-hr)
NOx HC+NOx

6
3
3
3
5
5
4.67 6
4
5.18 5
4.82 5
5.74 6
5
5.10 5
6
6
6
6
3
3

.70
.36
.82
.77
.45
.23
.26
.09
.96
.53
.32
.49
.67
.61
.25
.30
.57
.72
.88
CO

4.70
1.04
2.11
2.95
4.10
1.68
3.81
1.09
3.93
3.83
3.29
3.86
3.18
5.00
5.03
3.84
3.61
1.91
3.84
PM

0.57
0.28
0.35
0.33
0.24
0.21
0.44
0.44
0.66
0.57
0.45
0.51
0.54
0.50
0.49
0.39
0.48
0.35
0.33
HCfracof HCwgt
HC+NOx*
0
0
0
0
0
0
0.253454 0
0
0.131414 0
0.128205 0
0.091981 0
0
0.101183 0
0
0
0
0
0
0

.0000
.0000
.0000
.0000
.0000
.0000
.2013
.0000
.1409
.1477
.1409
.0000
.3691
.0000
.0000
.0000
.0000
.0000
.0000
Sales Weightings
NOx wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.2013
0.0000
0.1409
0.1477
0.1409
0.0000
0.3691
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
HC+NOx

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
wgt
.0426
.0059
.0106
.0355
.0284
.0248
.0106
.0004
.0075
.0078
.0075
.0075
.0195
.2768
.1821
.2425
.0234
.0554
.0114
CO wgt

0.0426
0.0059
0.0106
0.0355
0.0284
0.0248
0.0106
0.0004
0.0075
0.0078
0.0075
0.0075
0.0195
0.2768
0.1821
0.2425
0.0234
0.0554
0.0114
PM wgt

0.0426
0.0059
0.0106
0.0355
0.0284
0.0248
0.0106
0.0004
0.0075
0.0078
0.0075
0.0075
0.0195
0.2768
0.1821
0.2425
0.0234
0.0554
0.0114
 wgt EF
 Sample
  Size
CalcHC*  0.850153
  Calc
  NOx*
    0.828378  5.073763  6.018891

       5        5       19
4.174066  0.442010

  19      19    0.141247
                                                                1.0000    1.0000    1.0000   1.0000   1.0000
             5.168738
* HC fraction of HC+NOx = HC + (HC+NOx).  The average HC fraction is not a sales-weighted average.
Calculated HC = (avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                            D48

-------
Table D7. 2001 MY Certification Data (cont.)
11-25hp
Rated
HP
19
17
25
16
21
17
18
23
11
17
12
18
21
24
24
19
18
17
25
12
20
23
22
16
19
18
21
21
17
23
15
15
16
22
22
12
16
12
19
22
24
17
18
Sales-
wgtEF
Emission Factors (g/hp-hr)
HC


0.58
0.45
0.60
0.30











0.17
0.10
0.11




0.60
0.98
1.03
0.30



0.72
0.43
0.57
0.77
0.37








0.447831
NOx


3.79
4.07
3.61
3.77











5.59
3.48
3.38




3.61
4.38
5.04
3.77



5.29
5.70
5.62
5.17
5.17








4.109521
HC+NOx

5.02
4.37
4.52
4.21
4.07
5.26
5.15
3.98
4.88
4.38
5.54
4.96
3.68
3.54
5.67
3.40
5.76
3.58
3.49
5.53
5.66
4.30
4.66
4.21
5.36
6.05
4.07
4.10
3.62
5.34
6.02
6.12
6.19
5.94
5.53
5.03
4.46
3.17
4.29
3.47
5.63
4.88
3.24
4.806920
CO

1.36
3.82
3.09
2.31
1.72
1.69
0.77
1.08
1.88
2.36
2.57
1.10
1.34
1.06
1.66
0.99
0.97
0.56
0.56
2.77
2.23
1.73
1.50
2.31
3.78
3.50
1.72
2.24
1.57
0.68
3.70
2.41
3.00
3.04
1.58
2.95
2.98
1.47
1.28
2.27
0.90
1.55
1.91
2.114884
PM

0.45
0.57
0.38
0.10
0.20
0.39
0.23
0.26
0.50
0.52
0.33
0.56
0.57
0.30
0.56
0.37
0.54
0.33
0.30
0.22
0.21
0.14
0.12
0.10
0.25
0.41
0.20
0.35
0.30
0.22
0.43
0.39
0.37
0.45
0.32
0.26
0.35
0.30
0.08
0.19
0.25
0.42
0.32
0.242992
HC frac of
HC+NOx*

0.131868
0.099558
0.141844
0.073394











0.028849
0.027933
0.030399




0.142113
0.182132
0.169964
0.073154



0.120198
0.069428
0.092771
0.129397
0.066038









HCwgt

0.0000
0.0312
0.1248
0.0062
0.0312
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0027
0.2702
0.1179
0.0000
0.0000
0.0000
0.0000
0.0031
0.1373
0.0811
0.0343
0.0000
0.0000
0.0000
0.0137
0.0137
0.0069
0.0630
0.0624
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000
Sales Weightings
NOx wgt

0.0000
0.0312
0.1248
0.0062
0.0312
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0027
0.2702
0.1179
0.0000
0.0000
0.0000
0.0000
0.0031
0.1373
0.0811
0.0343
0.0000
0.0000
0.0000
0.0137
0.0137
0.0069
0.0630
0.0624
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
1.0000
HC+NOx
wgt
0.0029
0.0036
0.0143
0.0007
0.0036
0.0004
0.0005
0.0024
0.0027
0.0037
0.0021
0.0301
0.0064
0.0014
0.0020
0.0031
0.0003
0.0309
0.0135
0.3563
0.0107
0.2138
0.0356
0.0004
0.0157
0.0093
0.0039
0.0071
0.0170
0.0020
0.0016
0.0016
0.0008
0.0072
0.0071
0.0011
0.0323
0.0355
0.0217
0.0276
0.0351
0.0280
0.0043
1.0000
CO wgt

0.0029
0.0036
0.0143
0.0007
0.0036
0.0004
0.0005
0.0024
0.0027
0.0037
0.0021
0.0301
0.0064
0.0014
0.0020
0.0031
0.0003
0.0309
0.0135
0.3563
0.0107
0.2138
0.0356
0.0004
0.0157
0.0093
0.0039
0.0071
0.0170
0.0020
0.0016
0.0016
0.0008
0.0072
0.0071
0.0011
0.0323
0.0355
0.0217
0.0276
0.0351
0.0280
0.0043
1.0000
PM wgt

0.0029
0.0036
0.0143
0.0007
0.0036
0.0004
0.0005
0.0024
0.0027
0.0037
0.0021
0.0301
0.0064
0.0014
0.0020
0.0031
0.0003
0.0309
0.0135
0.3563
0.0107
0.2138
0.0356
0.0004
0.0157
0.0093
0.0039
0.0071
0.0170
0.0020
0.0016
0.0016
0.0008
0.0072
0.0071
0.0011
0.0323
0.0355
0.0217
0.0276
0.0351
0.0280
0.0043
1.0000
D49

-------
Table D7. 2001 MY Certification Data (cont.)
11-25hp
  Rated
   HP
 Sample
  Size
CalcHC* 0.474395
  Calc
  NOx*
HC
16
Emission Factors (g/hp-hr)
 NOx   HC+NOx   CO
  16
      4.332525
43
43
PM


43
HC frac of
HC+NOx*

 0.09869
                                             Sales Weightings
                                 HCwgt  NOxwgt  HC+NOx COwgt PM wgt
                                                    wgt
     * HC fraction of HC+NOx = HC + (HC+NOx).  The average HC fraction is not a sales-weighted average.
     Calculated HC = (avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
     Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                             D50

-------
Table D7
25-50 hp
Rated
HP
42
25
28
49
34
33
38
30
26
28
43
48
35
39
47
25
28
30
40
47
29
29
33
35
28
39
28
33
37
37
27
37
27
49
35
45
35
46
34
47
48
30
26
31
42
26
44
. 2001 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC






0.11
0.26
0.16
0.29

















0.13
0.55
0.16
0.67
0.11
0.82
0.09
0.51
0.08
0.75
0.56
0.04
0.14
0.12
0.64






NOx






4.65
3.59
4.00
3.02
0.00
0.00
0.00














4.23
4.81
3.56
6.00
4.52
4.27
3.95
4.59
4.56
5.33
4.54
3.75
3.66
6.71
6.36






HC+NOx

6.52
5.31
4.92
4.93
5.21
4.77
3.85
4.17
3.31
7.02
6.89
6.82
5.68
6.39
6.37
4.35
3.76
3.86
4.50
3.38
4.11
4.11
3.13
4.21
3.57
4.35
4.36
5.36
3.72
6.67
4.63
5.09
4.04
5.10
4.64
6.08
5.10
3.79
3.80
6.83
7.00
1.41
4.64
3.80
3.84
4.46
5.37
CO

3.35
1.49
1.56
0.92
1.44
0.98
0.92
1.17
1.33
1.48
2.10
1.99
1.74
1.87
1.24
0.64
1.24
0.83
0.62
0.87
1.54
1.16
1.00
0.85
2.65
1.89
1.33
2.62
2.30
3.55
0.57
3.10
0.82
2.85
0.90
2.40
1.52
0.68
0.98
0.74
1.46
0.62
1.30
1.16
0.78
0.95
1.10
PM

0.42
0.50
0.54
0.34
0.38
0.25
0.19
0.26
0.15
0.24
0.34
0.44
0.21
0.16
0.12
0.13
0.20
0.17
0.20
0.27
0.50
0.35
0.34
0.37
0.43
0.45
0.54
0.47
0.58
0.42
0.31
0.37
0.46
0.50
0.40
0.29
0.48
0.33
0.50
0.30
0.31
0.26
0.28
0.36
0.24
0.35
0.38
HC frac of
HC+NOx*





0.023474
0.067829
0.039356
0.087838

















0.029817
0.102612
0.041678
0.10051
0.023758
0.1611
0.021308
0.1
0.017234
0.123355
0.109804
0.010554
0.036842
0.01757
0.091429






HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0149
0.0030
0.0030
0.0030
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0417
0.1204
0.0459
0.0361
0.0002
0.0387
0.0051
0.0605
0.0566
0.0548
0.4172
0.0038
0.0459
0.0015
0.0042
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Sales Weightings
NOx wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0116
0.0023
0.0023
0.0023
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0324
0.0935
0.0356
0.0280
0.0001
0.0301
0.0039
0.0470
0.0440
0.0426
0.3240
0.0029
0.0356
0.0012
0.0032
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
HC+NOx
wgt
0.0016
0.0013
0.0016
0.0011
0.0041
0.0016
0.0003
0.0003
0.0003
0.0350
0.0119
0.0110
0.0013
0.0024
0.0024
0.0001
0.0047
0.0033
0.0025
0.0006
0.0008
0.0156
0.0495
0.0204
0.0029
0.0009
0.0046
0.0132
0.0050
0.0039
0.0000
0.0042
0.0006
0.0066
0.0062
0.0060
0.0456
0.0004
0.0050
0.0002
0.0005
0.0326
0.0065
0.0195
0.0163
0.0651
0.0000
CO wgt

0.0016
0.0013
0.0016
0.0011
0.0041
0.0016
0.0003
0.0003
0.0003
0.0349
0.0119
0.0110
0.0013
0.0024
0.0024
0.0001
0.0047
0.0033
0.0025
0.0006
0.0008
0.0156
0.0495
0.0204
0.0029
0.0009
0.0046
0.0131
0.0050
0.0039
0.0000
0.0042
0.0006
0.0066
0.0062
0.0060
0.0456
0.0004
0.0050
0.0002
0.0005
0.0325
0.0065
0.0195
0.0163
0.0651
0.0000
PM wgt

0.0016
0.0013
0.0016
0.0011
0.0041
0.0016
0.0003
0.0003
0.0003
0.0349
0.0119
0.0110
0.0013
0.0024
0.0024
0.0001
0.0047
0.0033
0.0025
0.0006
0.0008
0.0156
0.0495
0.0204
0.0029
0.0009
0.0046
0.0131
0.0050
0.0039
0.0000
0.0042
0.0006
0.0066
0.0062
0.0060
0.0456
0.0004
0.0050
0.0002
0.0005
0.0325
0.0065
0.0195
0.0163
0.0651
0.0000
D51

-------
Table D7. 2001 MY Certification Data (cont.)
25-50 hp Emission Factors (g/hp-hr)
Rated HC NOx HC+NOx CO PM
HP
33
41
31
31
38
37
49
38
48
35
40
40
38
26
25
33
36
35
31
41
42
30
42
39
45
49
43
35
44
34
49
47
43
30
26
28
25
30
25
33
41
29
37
25
37
25

5.52
4.81
5.27
5.11
6.16
4.47
5.95
5.99
4.63
3.69 3.83
3.36 3.54
0.18 4.99 5.17
0.26 3.59 3.85
0.29 3.02 3.31
0.59 4.87 5.47
0.23 4.10 4.33
5.26 5.58
6.03
4.68
5.65
6.35
5.12
3.24
4.73
5.62
4.00
5.12
6.27
6.19
3.53 3.55
3.20 3.31
5.44 5.83
6.35
6.09
5.45
5.78
5.53
5.82
5.91
5.76
5.97
5.82
5.40
6.01
6.03
6.09

1.71
0.75
0.74
0.80
1.66
0.80
1.93
1.58
0.93
1.40
0.95
0.94
0.93
1.33
1.88
0.74
1.87
2.07
1.10
2.45
1.01
1.98
0.94
1.01
1.30
0.64
1.98
2.35
1.09
1.22
1.29
1.86
2.33
1.99
2.00
3.61
2.91
2.93
3.45
2.74
1.35
2.82
1.73
3.03
2.59
3.03

0.36
0.25
0.19
0.26
0.41
0.29
0.43
0.36
0.23
0.29
0.21
0.48
0.19
0.15
0.29
0.23
0.28
0.21
0.16
0.24
0.13
0.43
0.33
0.34
0.38
0.24
0.43
0.48
0.45
0.53
0.40
0.44
0.34
0.46
0.15
0.40
0.37
0.35
0.24
0.28
0.49
0.25
0.50
0.32
0.35
0.20
HC frac of HC wgt
HC+NOx*
0
0
0
0
0
0
0
0
0
0
0
0.034632 0
0.068327 0
0.088659 0
0.108272 0
0.054045 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0136
.0006
.0012
.0143
.0104
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
Sales Weightings
NOx wgt HC+NOx CO wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0231
0.0231
0.0105
0.0005
0.0009
0.0111
0.0081
0.0116
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0127
0.0694
0.0509
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
wgt
0.0000
0.0003
0.0326
0.0391
0.0260
0.1628
0.0003
0.0003
0.0020
0.0033
0.0033
0.0015
0.0001
0.0001
0.0016
0.0011
0.0016
0.0015
0.0015
0.0024
0.0020
0.0035
0.0003
0.0026
0.0009
0.0001
0.0001
0.0033
0.0015
0.0018
0.0098
0.0072
0.0006
0.0003
0.0280
0.0097
0.0137
0.0009
0.0018
0.0476
0.0009
0.0030
0.0009
0.0004
0.0272
0.0000

0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.

.0000
.0003
.0325
.0390
.0260
.1627
.0003
.0003
.0020
.0033
.0033
.0015
.0001
.0001
.0016
.0011
.0016
.0015
.0015
.0024
.0020
.0035
.0003
.0026
.0009
.0001
.0001
.0033
.0015
.0018
.0098
.0072
.0006
.0003
.0280
.0097
.0137
.0009
.0018
.0476
.0009
.0030
.0009
.0004
.0272
.0000
PM wgt

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

.0000
.0003
.0325
.0390
.0260
.1627
.0003
.0003
.0020
.0033
.0033
.0015
.0001
.0001
.0016
.0011
.0016
.0015
.0015
.0024
.0020
.0035
.0003
.0026
.0009
.0001
.0001
.0033
.0015
.0018
.0098
.0072
.0006
.0003
.0280
.0097
.0137
.0009
.0018
.0476
.0009
.0030
.0009
.0004
.0272
.0000
D52

-------
Table D7.  2001 MY Certification Data (cont.)
25-50 hp
  Rated
   HP
   30
   45
   38
   48
   34
   46
   41
   48
   27
   39
   30
   50
            HC
            0.17
mission Factors (g/hp-hr)
NOx











4.01
4.85
HC+NOx

6.07
5.85
5.79
6.00
5.94
6.01
5.76
6.25
3.04
5.53


CO

3.01
3.21
3.23
1.56
1.87
2.54
2.79
1.59
0.98
1.96
1.17

PM

0.38
0.45
0.39
0.44
0.34
0.20
0.33
0.28
0.40
0.26
0.26

HC frac of HC wgt
HC+NOx*
0
0
0
0
0
0
0
0
0
0
0.040139 0
0

.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0000
.0036
.0000
Sales Weightings
NOx wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0028
0.0325
HC+NOx
wgt
0.0110
0.0367
0.0017
0.0000
0.0689
0.0063
0.0030
0.0002
0.0021
0.0010
0.0000
0.0000
CO wgt

0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.

.0110
.0367
.0017
.0000
.0689
.0062
.0030
.0002
.0021
.0010
.0004
.0000
PM wgt

0
0
0
0
0
0
0
0
0
0
0
0

.0110
.0367
.0017
.0000
.0689
.0062
.0030
.0002
.0021
.0010
.0004
.0000
 wgt EF
 Sample
  Size
CalcHC*  0.317014
  Calc
  NOx*
          0.472917  4.469647  4.952901  1.532028  0.329222

            25       35      103      104     104   0.064006
                                                                 1.0000    1.0000   1.0000   1.0000   1.0000
                   4.635887
     * HC fraction of HC+NOx = HC + (HC+NOx). The average HC fraction is not a sales-weighted average.
     Calculated HC = (avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
     Calculated NOx = (1- avg HC fraction of HC+NOx) * (sales-wgt avg HC+NOx).
                                                D53

-------
Table D7.  2001 MY Certification Data (cont.)
50-100 hp         Emission Factors (g/hp-hr)
Rated HP   HC    NOx  HC+NOx
67
79
96
80
67
75
80
56
75
98
62
57
55
59
84
59
78
81
74
59
82
65
58
87
83
65
84
79
94
94
94
51
56
78
51
60
52
50
52
51
54
51
55
64
76
51



0.48
0.75
0.70
0.72
0.62
0.70
0.71





0.89
0.48
0.33




















0.17
1.44
0.69
0.60
0.39
0.43
0.29
0.41
6.40
5.74
5.81
7.61
6.35
5.68
5.78
5.83
5.68
6.30
6.23
6.20
5.80
6.56
5.74
8.82
5.36
6.35
5.90
5.90
5.44
5.80
6.39
6.39
6.56
6.20
6.79
6.32
6.09
6.09
6.09
5.38
4.98
6.22
4.86
4.06
4.59
3.43
5.22
5.79
4.15
6.68
6.16
5.62
5.35
5.34
'hp-hr) Sales Weightings
CO




4.32
1.96
2.28
3.26
1.63
2.28
1.68





3.55
1.92
2.33
















1.51
1.73


1.18
3.90
1.45
3.04
0.98
2.17
1.08
2.22
PM




0.56
0.34
0.46
0.51
0.41
0.49
0.21





0.84
0.35
0.38




















0.45
0.38
0.36
0.63
0.28
0.60
0.51
0.64
HCwgt

0.0000
0.0000
0.0000
0.0621
0.0036
0.0888
0.0855
0.0339
0.0586
0.0004
0.0000
0.0000
0.0000
0.0000
0.0000
0.1563
0.0858
0.0154
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0107
0.0179
0.0100
0.0008
0.0134
0.0042
0.0092
0.0386
NOxwgt HC+NOx
wgt
0.0016
0.0004
0.0002
0.0157
0.0009
0.0224
0.0216
0.0086
0.0148
0.0001
0.0008
0.0008
0.0008
0.0045
0.0478
0.0395
0.0217
0.0039
0.0040
0.0205
0.0661
0.0179
0.0002
0.0002
0.0024
0.0143
0.0000
0.0025
0.0004
0.0004
0.0004
0.0024
0.0011
0.0000
0.0022
0.0022
0.0163
0.0094
0.0027
0.0045
0.0025
0.0002
0.0034
0.0011
0.0023
0.0098
CO wgt

0.0000
0.0000
0.0000
0.0591
0.0034
0.0844
0.0813
0.0322
0.0557
0.0004
0.0000
0.0000
0.0000
0.0000
0.0000
0.1486
0.0816
0.0147
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0084
0.0084
0.0000
0.0000
0.0101
0.0170
0.0095
0.0008
0.0127
0.0040
0.0087
0.0367
PM wgt

0.0000
0.0000
0.0000
0.0608
0.0035
0.0869
0.0837
0.0332
0.0573
0.0004
0.0000
0.0000
0.0000
0.0000
0.0000
0.1530
0.0840
0.0151
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0104
0.0175
0.0098
0.0008
0.0131
0.0041
0.0090
0.0378
                                                    D54

-------
Table D7.  2001 MY Certification Data (cont.)
50-100 hp         Emission Factors (g/hp-hr)
Rated HP   HC    NOx  HC+NOx
56
83
91
79
86
86
59
51
74
74
80
99
98
56
59
51
51
56
89
73
86
93
72
54
59
51
56
51
54
63
95
57
51
87
55
81
92
52
72
89
67
92
55
85
59
64
0.48
0.49
0.42
0.55
0.46
0.35

0.05
0.49
0.76
0.72
0.28
0.71
0.62









0.54
















0.22
0.35




4.88
4.80
6.63
5.25
4.98
5.09
6.65
3.56
3.77
4.70
5.78
4.15
6.30
5.83
4.37
5.12
4.72
4.18
4.79
4.93
5.42
4.71
4.31
6.31
3.34
4.78
5.95
3.91
2.62
5.06
5.58
4.46
5.35
5.92
2.91
5.87
5.10
6.32
5.14
6.40
5.71
6.16
2.62
2.18
5.90
5.58
'hp-hr) Sales Weightings
CO

0.46
0.76
1.32
2.47
0.83
0.67

0.75
3.00
2.06
3.26
0.76
1.68
1.63









2.42
















1.01
1.22




PM

0.27
0.34
0.54
0.55
0.38
0.21

0.20
0.52
0.32
0.51
0.25
0.21
0.41


























0.54
0.29




HCwgt

0.0048
0.0065
0.0172
0.0248
0.0012
0.0002
0.0000
0.0097
0.0008
0.0161
0.0018
0.0133
0.0040
0.0019
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0085
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0934
0.0638
0.0000
0.0000
0.0000
0.0000
NOxwgt HC+NOx
wgt
0.0012
0.0016
0.0043
0.0063
0.0003
0.0001
0.0333
0.0024
0.0002
0.0041
0.0004
0.0034
0.0010
0.0005
0.0367
0.0004
0.0004
0.0245
0.0020
0.0020
0.0082
0.0082
0.0151
0.0021
0.0002
0.0029
0.0029
0.0031
0.0039
0.0006
0.0002
0.0046
0.0042
0.0056
0.0013
0.0001
0.0002
0.0041
0.0008
0.0020
0.0236
0.0161
0.0010
0.0011
0.0002
0.0102
CO wgt

0.0046
0.0061
0.0163
0.0236
0.0011
0.0002
0.0000
0.0092
0.0008
0.0153
0.0017
0.0127
0.0038
0.0018
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0081
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0888
0.0606
0.0000
0.0000
0.0000
0.0000
PM wgt

0.0047
0.0063
0.0168
0.0243
0.0012
0.0002
0.0000
0.0095
0.0008
0.0158
0.0017
0.0130
0.0039
0.0018
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0914
0.0624
0.0000
0.0000
0.0000
0.0000
                                                    D55

-------
Table D7. 2001 MY Certification Data (cont.)
50-1 00 hp
Rated HP HC

79
55
52
64
60
96
68
52
68
80 0.83
80 0.86
59
89
94
50
74 0.05
82 0.07
60
58
59
75
58
54
67
80
56
58
60
70
57
95
100
50 0.52
65 0.05
79
Sales-wgt Q575867
Sample 4Q
Size
Emission Factors (g/hp-hr)
NOx HC+NOx CO PM

6.16
3.22
6.62
5.13
6.06
5.09
5.85
5.97
6.34
6.00 3.19 0.63
5.40 4.00 0.64
3.58
5.10
5.75
5.80 1.78 0.46
4.00 0.25 0.20
4.84 1.22 0.44
5.87 3.96 0.31
6.27 1.32 0.27
5.59 0.96 0.45
3.87
3.91
5.40
4.89
4.80
5.23
5.12
4.12
5.59
5.72
5.10
5.73
4.77 5.28 1.94 0.33
4.18 4.24 0.90
5.98 6.61 1.71 0.37
5.604515 5.976957 2.314372 0.506824
127 3 47 43
Sales Weightings
HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0043
0.0051
0.0000
0.0000
0.0000
0.0000
0.0002
0.0113
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0121
0.0040
0.0000
1.0000

NOxwgt HC+NOx
wgt
0.0055
0.0090
0.0080
0.0037
0.0212
0.1081
0.0551
0.0347
0.0347
0.0011
0.0013
0.0025
0.0008
0.0002
0.0002
0.0000
0.0029
0.0004
0.0015
0.0003
0.0013
0.0017
0.0001
0.0135
0.0004
0.0015
0.0037
0.0032
0.0117
0.0002
0.0032
0.0144
0.0031 0.3000
0.0010 0.1000
0.0061 0.6000
1.0000 1.0000

CO wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0041
0.0048
0.0000
0.0000
0.0000
0.0008
0.0002
0.0107
0.0015
0.0058
0.0013
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0115
0.0038
0.0230
1.0000

PM wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0042
0.0050
0.0000
0.0000
0.0000
0.0009
0.0002
0.0111
0.0016
0.0059
0.0013
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0118
0.0000
0.0237
1.0000

D56

-------
Table D7. 2001 MY Certification Data (cont.)
100-1 75 hp
Rated HP
173
108
143
100
125
118
155
110
165
166
155
100
125
118
155
158
109
144
168
135
168
109
158
119
121
134
103
153
164
139
106
144
100
125
155
125
114
151
120
144
114
113
132
173
108
116
168
Emission Factors (g/hp-hr)
HC
0.33


0.35
0.23
0.25
0.38



0.15
0.35
0.23
0.25
0.38



0.11
0.40



0.58
0.49
0.34
0.57
0.51
0.47
0.52


0.35
0.23
0.38









0.16
0.57
0.42
NOx
6.37
6.47
6.09
6.08
6.21
4.53
4.23
6.06
6.24
4.95
4.25
6.08
6.21
4.53
4.23
6.53
6.41
4.97
6.17
5.70
6.26
6.32
6.70
6.20
4.30
4.30
6.26
5.65
4.67
4.30
6.01
6.61
6.08
6.21
4.23
5.74
5.42
5.60
5.50
5.80
6.35
4.41
6.05
5.79
6.25
6.43
5.85
CO
0.78


0.70
0.47
0.54
0.75



1.91
0.70
0.47
0.54
0.75



0.63
1.75

0.53

0.63
1.23
1.00
1.58
0.49
1.06
1.25


0.70
0.47
0.75









0.43
1.45
0.76
PM
0.11


0.28
0.16
0.22
0.35



0.22
0.28
0.16
0.22
0.35



0.13
0.29

0.13

0.17
0.28
0.24
0.39
0.26
0.23
0.19


0.28
0.16
0.35









0.26
0.33
0.27
HCwgt
0.0003
0.0000
0.0000
0.0857
0.0057
0.0021
0.1029
0.0000
0.0000
0.0000
0.0072
0.1247
0.0623
0.0023
0.0935
0.0000
0.0000
0.0000
0.0007
0.2824
0.0000
0.0000
0.0000
0.0010
0.0011
0.0050
0.0059
0.0078
0.0017
0.0006
0.0000
0.0000
0.0457
0.0114
0.0571
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0407
0.0050
0.0199
Sales Weightings
HCwgt
0.0003
0.0000
0.0000
0.0857
0.0057
0.0021
0.1029
0.0000
0.0000
0.0000
0.0072
0.1247
0.0623
0.0023
0.0935
0.0000
0.0000
0.0000
0.0007
0.2824
0.0000
0.0000
0.0000
0.0010
0.0011
0.0050
0.0059
0.0078
0.0017
0.0006
0.0000
0.0000
0.0457
0.0114
0.0571
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0407
0.0050
0.0199
NOx wgt
0.0002
0.0002
0.0001
0.0682
0.0045
0.0017
0.0819
0.0039
0.0303
0.0003
0.0057
0.0992
0.0496
0.0018
0.0744
0.0016
0.0016
0.0016
0.0006
0.2248
0.0105
0.0001
0.0072
0.0008
0.0009
0.0040
0.0047
0.0062
0.0014
0.0005
0.0426
0.0001
0.0364
0.0091
0.0455
0.0041
0.0002
0.0000
0.0009
0.0001
0.0113
0.0060
0.0041
0.0017
0.0324
0.0040
0.0159
CO wgt
0.0003
0.0000
0.0000
0.0856
0.0057
0.0021
0.1027
0.0000
0.0000
0.0000
0.0072
0.1244
0.0622
0.0023
0.0933
0.0000
0.0000
0.0000
0.0007
0.2819
0.0000
0.0001
0.0000
0.0010
0.0011
0.0050
0.0059
0.0078
0.0017
0.0006
0.0000
0.0000
0.0456
0.0114
0.0570
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0406
0.0050
0.0199
PM wgt
0.0003
0.0000
0.0000
0.0863
0.0058
0.0021
0.1035
0.0000
0.0000
0.0000
0.0072
0.1255
0.0627
0.0023
0.0941
0.0000
0.0000
0.0000
0.0007
0.2842
0.0000
0.0001
0.0000
0.0010
0.0011
0.0050
0.0059
0.0079
0.0017
0.0006
0.0000
0.0000
0.0460
0.0115
0.0575
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0410
0.0051
0.0200
D57

-------
Table D7. 2001 MY Certification Data (cont.)
100-1 75 hp
Rated HP
118
120
103
172
115
152
103
135
130
100
114
127
117
172
173
122
122
100
142
138
161
116
Sales-wgt
EF
Sample Size
Emission Factors (g/hp-hr)
HC NOx CO PM
6.30
5.55

0.13


0.53
0.45
0.63
0.57




0.54
0.07
0.07



0.23

0.355107
34
6.19
5.31
5.77
5.82
5.30
6.68
6.61
5.50
6.39
5.38
6.23
6.23
6.57
3.93
5.75
6.27
5.92
6.68
5.96
5.82
5.574714
69

0.45


1.24
0.92
1.21
1.35




1.83
0.42
1.06
0.87
1.33

0.83

1.003922
37

0.17


0.51
0.24
0.36
0.47




0.42
0.14
0.34
0.33
0.23



0.289340
36
HCwgt
0.0000
0.0000
0.0000
0.0094
0.0000
0.0000
0.0010
0.0004
0.0007
0.0015
0.0000
0.0000
0.0000
0.0000
0.0010
0.0001
0.0049
0.0000
0.0000
0.0000
0.0082
0.0000
1.0000

Sales Weightings
NOx wgt CO wgt
0.0005 0.0000
0.0178 0.0000
0.0055
0.0074
0.0041
0.0372
0.0008
0.0003
0.0006
0.0012
0.0025
0.0008
0.0008
0.0025
0.0008
0.0001
0.0039
0.0005
0.0008
0.0019
0.0065
0.0005
1.0000

0.0000
0.0093
0.0000
0.0000
0.0010
0.0004
0.0007
0.0015
0.0000
0.0000
0.0000
0.0000
0.0010
0.0001
0.0049
0.0006
0.0010
0.0000
0.0082
0.0000
1.0000

PM wgt
0.0000
0.0000
0.0000
0.0094
0.0000
0.0000
0.0010
0.0004
0.0007
0.0015
0.0000
0.0000
0.0000
0.0000
0.0010
0.0001
0.0050
0.0006
0.0010
0.0000
0.0000
0.0000
1.0000

                                         D58

-------
Table D7. 2001 MY Certification Data (cont.)
•300 hp
ted HP

272
257
200
240
240
215
260
240
280
210
275
205
255
290
205
190
240
200
189
215
260
240
280
240
200
296
255
261
248
275
220
234
196
199
294
285
216
285
237
189
194
288
186
249
243
210
Emission Factors (g/hp-hr)
HC

0.32
0.43
0.26
0.10
0.07
0.32
0.44
0.29
0.47
0.20
0.11
0.19
0.08
0.09
0.39
0.55
0.10
0.26
0.33
0.32
0.44
0.29
0.47
0.07
0.25
0.31
0.36
0.47
0.34
0.14
0.20
0.19
0.28
0.27
0.38
0.46
0.59
0.47
0.78
0.43
0.31
0.62
0.34
0.48
0.40
0.09
NOx

6.24
6.43
5.13
5.06
4.06
5.51
5.82
5.38
5.47
5.89
4.56
5.96
6.20
5.46
5.95
5.64
5.06
5.13
3.95
5.51
5.82
5.38
5.47
4.06
5.43
6.41
6.45
6.06
5.31
5.38
5.87
5.45
5.44
5.70
5.99
6.51
6.20
4.59
6.32
6.65
6.28
6.62
6.28
6.37
5.88
5.16
HC+NOx CO

0
0
0
0
0
0
0
0
0
1
1
1
0
2
1
1
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
0
1
1
0
1
1
0
1
0
1
1
0

.62
.76
.60
.38
.50
.55
.70
.49
.52
.49
.26
.73
.96
.19
.19
.44
.38
.60
.54
.55
.70
.49
.52
.50
.23
.96
.72
.89
.04
.48
.72
.62
.65
.05
.95
.19
.55
.73
.30
.04
.81
.69
.69
.08
.67
.90
PM

0.10
0.20
0.22
0.15
0.16
0.32
0.27
0.27
0.23
0.33
0.26
0.25
0.29
0.35
0.31
0.32
0.15
0.22
0.20
0.32
0.27
0.27
0.23
0.16
0.35
0.25
0.24
0.27
0.35
0.14
0.27
0.25
0.28
0.32
0.23
0.22
0.28
0.26
0.38
0.34
0.17
0.36
0.23
0.24
0.37
0.11
HCwgt

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

.0003
.0002
.0045
.0023
.0023
.0038
.0015
.0064
.0151
.0092
.0002
.0024
.0143
.0016
.0008
.0227
.0038
.0753
.0015
.0376
.0205
.0753
.0075
.0038
.0013
.0013
.0000
.0000
.0001
.0008
.0042
.0097
.4205
.0147
.0640
.0164
.0458
.0287
.0000
.0014
.0083
.0005
.0004
.0001
.0000
.0021
Sales Weightings
NOx wgt

0.0003
0.0002
0.0045
0.0023
0.0023
0.0038
0.0015
0.0064
0.0151
0.0092
0.0002
0.0024
0.0143
0.0016
0.0008
0.0227
0.0038
0.0753
0.0015
0.0376
0.0205
0.0753
0.0075
0.0038
0.0013
0.0013
0.0000
0.0000
0.0001
0.0008
0.0042
0.0097
0.4205
0.0147
0.0640
0.0164
0.0458
0.0287
0.0000
0.0014
0.0083
0.0005
0.0004
0.0001
0.0000
0.0021
HC+NOx
wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
CO wgt

0.0003
0.0002
0.0045
0.0022
0.0022
0.0037
0.0015
0.0063
0.0149
0.0091
0.0002
0.0024
0.0141
0.0016
0.0007
0.0225
0.0037
0.0745
0.0015
0.0372
0.0203
0.0745
0.0074
0.0037
0.0013
0.0013
0.0000
0.0000
0.0001
0.0008
0.0041
0.0096
0.4161
0.0146
0.0633
0.0163
0.0453
0.0284
0.0000
0.0014
0.0083
0.0005
0.0004
0.0001
0.0000
0.0020
PM wgt

0.0003
0.0002
0.0045
0.0022
0.0022
0.0037
0.0015
0.0063
0.0149
0.0091
0.0002
0.0024
0.0141
0.0016
0.0007
0.0225
0.0037
0.0745
0.0015
0.0372
0.0203
0.0745
0.0074
0.0037
0.0013
0.0013
0.0000
0.0000
0.0001
0.0008
0.0041
0.0096
0.4161
0.0146
0.0633
0.0163
0.0453
0.0284
0.0000
0.0014
0.0083
0.0005
0.0004
0.0001
0.0000
0.0020
                                            D59

-------
Table D7. 2001 MY Certification Data (cont.)
175-300 hp Emission Factors (g/hp-hr)
Rated HP HC NOx HC+NOx CO

250
215
197
241
241
227
193
200
189
215
240
280
189
252
283
262
244
285
215
197
251
184
280
298
212
286
208
202
190
177
182
207
217
244
272
255
279
275
185
245
295
268
Sales-wgt
EF
Sample
Size

0.09
0.10
0.33
0.21
0.41
0.51
0.60
0.26
0.33
0.32
0.29
0.47
0.31
0.22
0.14
0.17
0.39
0.06
0.04
0.33
0.23
0.30
0.19
0.37
0.29
0.22
0.15
0.28
0.66
0.34
0.42
0.44
0.36
0.19
0.35
0.25

0.11
0.54

0.22
0.30
0.314765
86

5.29
6.30
4.42
4.14
6.44
6.72
6.69
5.13
3.95
5.51
5.38
5.47
5.40
6.23
4.25
5.84
6.24
5.93
4.10
5.07
5.59
6.70
5.68
6.32
6.41
5.35
4.28
6.00
6.08
6.20
6.43
6.59
5.49
6.30
6.44
5.89

4.02
4.19

4.08
4.00
5.506545
86

0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
4.18 0
4.13 0
4.73 0
4.55 0
4.29 0
4.47 0

.44
.50
.71
.67
.11
.07
.85
.60
.54
.55
.49
.52
.92
.30
.43
.57
.74
.60
.51
.76
.42
.61
.51
.16
.40
.24
.52
.05
.56
.89
.87
.15
.00
.66
.09
.40
.73
.80
.93
.45
.60
.66
4.203295 0.744633
6 88
PM

0.05
0.07
0.20
0.17
0.34
0.33
0.28
0.22
0.20
0.32
0.27
0.23
0.21
0.23
0.17
0.21
0.18
0.09
0.16
0.18
0.11
0.18
0.18
0.30
0.14
0.37
0.26
0.33
0.40
0.28
0.29
0.36
0.22
0.37
0.22
0.13
0.20
0.16
0.20
0.15
0.13
0.19
0.266622
88
HCwgt

0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
1.


.0001
.0005
.0002
.0002
.0006
.0009
.0004
.0075
.0015
.0075
.0045
.0008
.0001
.0030
.0011
.0002
.0004
.0003
.0034
.0021
.0039
.0010
.0020
.0011
.0014
.0083
.0051
.0003
.0002
.0010
.0003
.0003
.0007
.0014
.0014
.0026
.0000
.0002
.0002
.0000
.0003
.0000
.0000

Sales Weightings
NOxwgt HC+NOx COwgt

0.0001
0.0005
0.0002
0.0002
0.0006
0.0009
0.0004
0.0075
0.0015
0.0075
0.0045
0.0008
0.0001
0.0030
0.0011
0.0002
0.0004
0.0003
0.0034
0.0021
0.0039
0.0010
0.0020
0.0011
0.0014
0.0083
0.0051
0.0003
0.0002
0.0010
0.0003
0.0003
0.0007
0.0014
0.0014
0.0026
0.0000
0.0002
0.0002
0.0000
0.0003
0.0000
1.0000

wgt
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.8977
0.0209
0.0132
0.0359
0.0299
0.0024
1.0000


0.0001
0.0005
0.0001
0.0001
0.0006
0.0009
0.0004
0.0074
0.0015
0.0074
0.0045
0.0008
0.0001
0.0029
0.0011
0.0002
0.0004
0.0003
0.0034
0.0021
0.0039
0.0010
0.0019
0.0011
0.0014
0.0082
0.0050
0.0003
0.0002
0.0010
0.0003
0.0003
0.0007
0.0014
0.0014
0.0026
0.0102
0.0002
0.0001
0.0004
0.0003
0.0000
1.0000

PM wgt

0.0001
0.0005
0.0001
0.0001
0.0006
0.0009
0.0004
0.0074
0.0015
0.0074
0.0045
0.0008
0.0001
0.0029
0.0011
0.0002
0.0004
0.0003
0.0034
0.0021
0.0039
0.0010
0.0019
0.0011
0.0014
0.0082
0.0050
0.0003
0.0002
0.0010
0.0003
0.0003
0.0007
0.0014
0.0014
0.0026
0.0102
0.0002
0.0001
0.0004
0.0003
0.0000
1.0000

D60

-------
Table D7. 2001 MY Certification Data (cont.) (Tier 2 for this hp category)
300-600 hp
Rated HP

325
439
515
593
475
325
449
422
322
333
300
350
500
500
300
317
321
483
360
326
456
481
322
410
508
572
503
571
475
595
367
493
493
324
375
Sales-wgt
EF
Sample
Size
Emission Factors (g/hp-hr)
HC







0.10
0.14
0.13
0.15




0.06
0.39
0.17
0.16
0.12
0.50
0.15
0.10











0.22
0.25
0.166924
14
NOx







3.80
4.09
4.37
4.38




4.02
4.19
4.22
4.23
4.47
4.04
4.37
4.44











4.30
4.29
4.335113
14
HC+NOx

4.56
3.75
3.58
4.08
4.14
4.56
3.91
4.24
4.50
4.53
4.53
4.71
4.75
4.61
4.08
4.58
4.39
4.39
4.59
4.54
4.52
4.53
4.34
4.40
4.20
4.53
4.50
4.29
4.38
4.20
4.55
4.49
4.49
4.53
4.54
4.345348
35
CO

1.52
1.19
1.14
0.58
0.99
1.52
0.37
0.35
0.44
0.53
0.82
0.77
1.30
0.48
0.59
0.80
0.52
0.46
0.63
0.43
0.57
0.43
0.65
0.30
0.30
0.86
0.93
0.48
0.46
0.63
0.45
0.71
0.71
0.47
0.48
0.842460
35
PM

0.17
0.16
0.17
0.10
0.14
0.17
0.10
0.10
0.11
0.14
0.14
0.11
0.12
0.12
0.13
0.15
0.14
0.13
0.09
0.14
0.10
0.08
0.15
0.11
0.12
0.19
0.15
0.14
0.11
0.16
0.15
0.13
0.13
0.08
0.08
0.131581
35
HCwgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0036
0.0279
0.0110
0.6951
0.0000
0.0000
0.0000
0.0000
0.0239
0.0150
0.0389
0.0235
0.0030
0.0022
0.0070
0.0036
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0100
0.1354
1.0000

Sales Weightings
NOx wgt

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0036
0.0279
0.0110
0.6951
0.0000
0.0000
0.0000
0.0000
0.0239
0.0150
0.0389
0.0235
0.0030
0.0022
0.0070
0.0036
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0100
0.1354
1.0000

HC+NOx
wgt
0.0516
0.0589
0.0521
0.2080
0.0460
0.0516
0.0011
0.0082
0.0032
0.2042
0.0038
0.0038
0.1467
0.0258
0.0070
0.0044
0.0114
0.0069
0.0009
0.0006
0.0021
0.0011
0.0066
0.0264
0.0016
0.0019
0.0064
0.0035
0.0035
0.0035
0.0035
0.0006
0.0006
0.0029
0.0398
1.0000

CO wgt

0.0516
0.0589
0.0521
0.2080
0.0460
0.0516
0.0011
0.0082
0.0032
0.2042
0.0038
0.0038
0.1467
0.0258
0.0070
0.0044
0.0114
0.0069
0.0009
0.0006
0.0021
0.0011
0.0066
0.0264
0.0016
0.0019
0.0064
0.0035
0.0035
0.0035
0.0035
0.0006
0.0006
0.0029
0.0398
1.0000

PM wgt

0.0516
0.0589
0.0521
0.2080
0.0460
0.0516
0.0011
0.0082
0.0032
0.2042
0.0038
0.0038
0.1467
0.0258
0.0070
0.0044
0.0114
0.0069
0.0009
0.0006
0.0021
0.0011
0.0066
0.0264
0.0016
0.0019
0.0064
0.0035
0.0035
0.0035
0.0035
0.0006
0.0006
0.0029
0.0398
1.0000

D61

-------
Table D7. 2001 MY Certification Data (cont.)
600-750 hp Emission Factors (g/hp-hr)
Rated HP HC NOx HC+NOx CO
660 0.05 6.24 0.83
742
654
730
740
670
710
641
740
684
671
747
680
601
750
750
630
Sales-wgt
EF
Sample
Size
0.04
0.04
0.06
0.10
0.25
0.27
0.19
0.24
0.19
0.48
0.22

0.13
0.07
0.13
0.12
0.138065
16
6.27
6.21
5.04
5.53
6.53
6.63
5.98
5.85
5.98
6.63
4.50

4.19
5.84
5.89
3.87
5.612418
16
0.52
1.58
0.99
1.62
1.27
2.31
1.05
1.37
0.68
0.52
0.76
3.89 0.33
4.32 0.22
0.90
1.06
3.99 0.87
3.975047 0.883305
3 17
PM
0.14
0.10
0.25
0.19
0.33
0.36
0.30
0.23
0.28
0.22
0.16
0.09
0.12
0.12
0.16
0.13
0.18
0.183773
17
HCwgt
0.0276
0.0408
0.1192
0.1159
0.0850
0.0795
0.0552
0.0353
0.0839
0.0055
0.0221
0.0055
0.0000
0.1049
0.0121
0.1413
0.0662
1.0000

Sales Weightings
NOxwgt HC+NOx COwgt
wgt
0.0276 0.0000 0.0192
0.0408
0.1192
0.1159
0.0850
0.0795
0.0552
0.0353
0.0839
0.0055
0.0221
0.0055
0.0000
0.1049
0.0121
0.1413
0.0662
1.0000

0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.7192
0.1721
0.0000
0.0000
0.1087
1.0000

0.0284
0.0829
0.0806
0.0591
0.0553
0.0384
0.0246
0.0583
0.0038
0.0153
0.0038
0.3047
0.0729
0.0084
0.0982
0.0460
1.0000

PM wgt
0.0192
0.0284
0.0829
0.0806
0.0591
0.0553
0.0384
0.0246
0.0583
0.0038
0.0153
0.0038
0.3047
0.0729
0.0084
0.0982
0.0460
1.0000

D62

-------
Table D7.
>750 hp
Rated HP
758
891
1850
2250
755
1200
2000
1110
1500
1200
899
1230
811
1874
878
1207
1026
2346
Sales-wgt
EF
Sample
Size
2001 MY Certification Data (cont.)
Emission Factors (g/hp-hr)
HC NOx CO PM
0.07 5.26 1.07 0.16
0.05
0.16
0.16
0.35
0.17
0.31
0.23
0.54
0.17
0.21
0.12
0.27
0.38
0.34
0.23
0.26
0.40
0.313093
18
6.22
5.89
6.43
5.80
5.17
5.91
6.03
6.24
5.17
6.02
6.03
6.24
6.15
5.96
5.45
5.07
6.04
6.052394
18
0.73
1.09
1.28
1.48
0.34
1.49
0.55
0.87
0.34
0.53
0.67
1.05
1.36
0.89
1.26
0.70
1.39
0.800887
18
0.14
0.30
0.20
0.30
0.16
0.25
0.14
0.27
0.16
0.15
0.26
0.21
0.15
0.14
0.24
0.18
0.26
0.203589
18
HCwgt
0.0052
0.0152
0.0654
0.0395
0.0599
0.0033
0.0228
0.4402
0.2677
0.0228
0.0088
0.0046
0.0152
0.0024
0.0152
0.0030
0.0009
0.0076
1.0000

Sales Weightings
NOx wgt CO wgt
0.0052 0.0052
0.0152
0.0654
0.0395
0.0599
0.0033
0.0228
0.4402
0.2677
0.0228
0.0088
0.0046
0.0152
0.0024
0.0152
0.0030
0.0009
0.0076
1.0000

0.0152
0.0654
0.0395
0.0599
0.0033
0.0228
0.4402
0.2677
0.0228
0.0088
0.0046
0.0152
0.0024
0.0152
0.0030
0.0009
0.0076
1.0000

PM wgt
0.0052
0.0152
0.0654
0.0395
0.0599
0.0033
0.0228
0.4402
0.2677
0.0228
0.0088
0.0046
0.0152
0.0024
0.0152
0.0030
0.0009
0.0076
1.0000

D63

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                                   Appendix E
           Derivation of Highway-Certification Compliance Margins and
               Application to Nonroad Compression Ignition Engines

       Here below, we describe the derivation of the highway-certification compliance
margins (HCCMs) in greater detail.  The highway certification results used for this purpose
in derivation of Tier 2/3 emission factors (option 4) are summarized in a report updating
emission levels for heavy-duty highway diesel engines for use in MOBILE6 (1). The report
presents results for light, medium, and heavy vehicle classes in model years 1988-1989 and
1991-1994. For this analysis, we supplemented these certification data with more recent
highway certification data from model years 1997-2001.

       We used the highway certification results to calculate compliance margins (HCCM)
for some highway engines for MY 1988-2001. The procedure followed several steps ( refer
to Table El):

(1)     We assigned highway model-year groups, (e.g., 1991-93) to each nonroad
       horsepower category (e.g., 50-100 hp).  These assignments vary for each pollutant
       and individual horsepower category. The assignments attempt to associate similar
       highway and nonroad engine technologies. We averaged results for multiple years
       within a model-year group.

(2)     We assigned nonroad engines less than 50 horsepower to the light heavy-duty diesel
       vehicle weight class (LHDD), engines in the range of 50-250  hp to the medium
       heavy-duty diesel vehicle weight class (MHDD), and engines greater than 250 hp to
       the heavy heavy-duty diesel vehicle weight class (HHDD). Within a model-year
       group, these assignments identified subsets of certification data to represent specific
       nonroad horsepower categories. Correspondence between highway weight class
       (light-duty, medium-duty, heavy-duty) and nonroad horsepower categories follows
       relationships established by the California Air Resources Board (CARB 2000).

(3)     We used the highway certification data described above and assigned to the
       appropriate nonroad horsepower categories to calculate compliance margins for
       highway engines at certification:
                                       HS,., - AHC,.,
                           HCCM,.__,.  =	•+-—	-

       where HCCM^, HS^. and AHC^ are the highway-certification compliance margin,
       highway standard and average certification emissions level, respectively, for
       pollutant /', and horsepower category7 (e.g., NOX, 50-100 hp).
                                        El

-------
       While we calculated the highway-certification compliance margins for all pollutants
and horsepower categories, note that Table El presents results only for NOX and PM. We
do not present compliance margins for HC and CO because we did not use them in
estimation of Tier 2/3 emission factors.

References

(1) EPA, "Update of Heavy-Duty Emission Levels (Model Years 1988-2004+) for Use in
MOBILE6," EPA420-R-99-010, April 1999.
                                       E2

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Table El.  Highway-Certification Compliance Margins by Horsepower Category
Nonroad Engine
Power Categories
(hp)


<11
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750

<11
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750
Highway Model-
Year Group (MYG)


1991-93
1991-93
1991-93
1991-93
1998-2003
1998-2003
1998-2003
1998-2003
1998-2003

1988-89
1988-89
1988-89
1991-93
1991-93
1994-97
1994-97
1994-97
1994-97
Corresponding Heavy-Duty Highway Vehicle Weight Class
(VWC), Emission Standards (HS), Certification Test Results
(AHC) and Compliance Margins (HCCM)

VWC1
LHDD
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD

LHDD
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD
NOX
HS
(g/hp-hr)
5.0
5.0
5.0
5.0
4.0
4.0
4.0
4.0
4.0
PM
0.6
0.6
0.6
0.25
0.25
0.10
0.10
0.10
0.10

AHC 2 HCCM
(g/hp-hr) (% HS)
4.28 14
4.28 14
4.28 14
4.54 9.0
3.78 5.5
3.58 10.5
3.92 2.0
3.84 4.0
3.84 4.0

0.44 27
0.44 27
0.44 27
0.20 20
0.20 20
0.08 20
0.08 20
0.08 20
0.08 20
1 LHDD = "light heavy-duty diesel," MHDD = "medium heavy
2 Source: USEPA (1999), forNO^ Table 10 or MY 1997-2001
1997-2001highway certification data.
-duty diesel," and HHDD = "heavy heavy-duty diesel.'
highway certification data; for PM, Table 11 or MY
                                            E3

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                                   Appendix F
               Derivation of Transient Adjustment Factors (TAFs) for
                      Nonroad Compression Ignition Engines
       Nonroad engines often operate under conditions unlike that of the steady-state ISO-
Cl testing procedure typically used in emissions testing. This alternate operation can cause
a change in the emission characteristics of nonroad compression ignition (CI) engines. As
in NEVES, the NONROAD model accounts for in-use (transient) operation in CI engines
by applying an adjustment to emission factors generated using the ISO-C1 (8-mode) steady-
state tests.  Unlike NEVES, the NONROAD model uses transient adjustment factors
derived from emission testing designed  to represent operational behavior of nonroad
equipment. Note that the transient adjustments are not applied by the NONROAD model,
but are applied by EPA during the creation of the NONROAD emission factor input files.

Development of Transient Adjustment Factors

       In NEVES, EPA adjusted the ISO-C1-derived emission factor data available at the
time to account for in-use operation by applying a set of multipliers. These factors were
derived from a comparison of only a few engines tested with both the ISO-C1 test
procedure and the highway Federal Test Procedure (FTP). (1) These factors shown in
Table Fl were applied in NEVES only to engines used in applications judged to be
sufficiently transient in nature.

Table Fl.  NEVES Test Cycle Adjustment from ISO-C1 Emission Factors
NEVES
Adjustment
HC
1.4
CO
2.0
NOX
1
PM
1.6
       NONROAD's steady-state emission factors for pre-1988 CI engines of greater than
50 hp are based on the emission factors used in the NEVES. As a result, the NEVES in-use
adjustments were removed to determine pre-1988 average steady-state emissions for these
engines. The TAFs described below are then applied consistently to all the steady-state
emission factors in NONROAD, including the NEVES-derived steady-state emission
factors.

       Since it was recognized that the highway test procedure may not simulate engine
behavior when used in nonroad applications, a joint EMAVEPA project was initiated to
develop more realistic test cycles for nonroad engine emissions characterization. The
project developed cycles to represent typical operation of an agricultural tractor, a crawler
dozer, and a backhoeMoader.  The cycles were developed from data acquired from
instrumenting one piece of each type of equipment. This data was used to construct
appropriate test cycles from statistical criteria developed by EMA and EPA. Southwest

                                       Fl

-------
Research Institute (SwRI) then tested nine late-model nonroad engines using the steady-
state ISO-C1 certification procedure and the three nonroad test cycles. (2)  Later testing at
SwRI involved three additional engines and four additional cycles (rubber-tire loader, skid-
steer loader, arc welder, and excavator cycles). (3)  A summary of the cycle specific
emission results for each engine is given in Table F2.

       For each pollutant and test cycle, we calculate the TAP as the ratio of the transient
emission factor (EFtrans) to the corresponding steady-state (ISO-C1) emission factor (EFSS):

                                            ER,
                                    j , p _  — - trans
                                             EF
                                               ss
Transient adjustment factors may be greater than or less than 1.0.

       Using the emission data in Table F2, TAFs were calculated for each engine,
pollutant, and test cycle.  The resulting TAFs for each engine are provided in Table F3.
The TAFs for each engine were then averaged to obtain composite TAFs for each of the
seven test cycles.  These are also shown in Table F3 along with the standard deviations.
TAFs for Tier 0 and Tier 1 engines were combined, since they were not statistically
different, based on P values obtained from performing the Student's ^-Test.

       For this version of NONROAD, the seven average cycle TAFs were further binned
into two categories, Hi LF and Lo LF,  based on the cycle load factors.  We thought this
approach would be more defensible, given the limited data available.  This approach is also
consistent with that used to develop the new load factors in the model. Table F4 shows
how the cycle TAFs were binned. When reviewing the cycle load factors, two bins
emerged. A high load factor bin consisted of the following cycles: agricultural tractor
(LF=0.78), crawler dozer (LF=0.58), rubber-tire loader (LF=0.48), and excavator
(LF=0.53).  A low load factor bin consisted of the remaining cycles: backhoe/loader
(LF=0.21), skid-steer loader (LF=0.23), and arc welder (LF=0.19). The TAFs for the high
load factor cycles were averaged to obtain a composite Hi  LF TAP.  Similarly, the TAFs
for the low load factor cycles were averaged to obtain a composite Lo LF TAP. As a result,
the cycle TAFs were replaced by either a Hi LF TAP or a Lo LF TAP, depending on the
cycle assignment.

       Table F5 presents the CI TAFs used in draft NONROAD2002. The TAFs are
carried over from Table F4 with the exception of the Tier 3 TAFs  for NOX and PM.  The
rationale for the NOX and PM Tier 3 TAFs is described in detail below.

Transient Emission Control and Implications for Tier 3 NOX and  PM TAFs

       The nonroad engine test cycle is a weighted 8 mode steady-state emission cycle
                                        F2

-------
without a transient test element. This is in contrast to on-highway diesel regulations which
are set based on average emissions over a 20 minute transient test and a separate steady-
state test.  The absence of a transient test allows some additional control flexibilities for
nonroad engines not available, or available at a diminished level, for on-highway diesel
engines. The nonroad engine standards are therefore inherently less restrictive than
otherwise equivalent on-highway emission standards, as explained in the following
paragraphs.

       Transient PM emission control is realized for on-highway diesel engines by limiting
fuel injection quantities dependent upon the oxygen content available (the air to fuel ratio,
A/F) to  burn the  fuel.  When an on-highway diesel engine transitions from a low load
steady-state  condition to a higher load it does so by increasing the fuel injection rate and the
air induction rate through increases in the intake manifold pressure (i.e. higher boost from
the turbocharger) in order to maintain an A/F ratio with acceptable PM emissions. While
the fueling rate can be changed almost instantaneously on a diesel engine, it takes a longer
amount of time for the turbocharger to increase the air flow due to the inertial lag of the
turbocharger and the mass of air. During the transient period when the turbocharger is
gradually increasing the air  flow, the engine control system limits the addition of fuel in
order to prevent excess PM emissions. It is only after the air flow has increased to the
proper amount, that the engine control system allows the fueling rate to rise to the level
needed to deliver the desired engine torque. This control approach limits transient PM
emissions so that the engine will pass the highway transient test. Absent a transient PM
emissions test, the engine controller could immediately increase the fueling rate, providing
rapid attainment of the desired torque level, but this would also dramatically increase PM
emissions. The increase in  PM emissions under transient conditions due to  the lack of
oxygen  (low A/F) is exacerbated by the use of exhaust gas recirculation (EGR) to limit NOX
emissions. This  is because  the recirculated gases have a lower oxygen content (the very
reason they help  to lower NOX emissions).  In order to maintain effective PM emission
control with EGR, turbocharger boost levels are increased (more low oxygen content air is
forced in to the engine in order to give a total oxygen content similar to without EGR).
Because of the higher boost pressure required, transient PM control  might be expected to be
worse for EGR equipped engines. For highway diesel engines which must meet a transient
PM emission standard, these issues are addressed with sophisticated control systems and
with the use of advanced turbocharger systems (i.e., variable geometry turbochargers).
Absent a transient test procedure, these advanced systems would not necessarily be used.

       Similarly, NOX control for on-highway diesel engines equipped with EGR systems
are significantly  constrained by the transient emission test procedure.  When undergoing a
transient event as described in the previous example, an EGR emission control system for
on-highway  engines would  briefly turn off EGR in order to increase the fresh air flow to the
system in order to limit PM emissions and increase engine torque response.  The control
system must, however, restore the EGR relatively quickly in order to control NOX emissions
under the highway transient test procedure.  Failure to do so would lead to higher NOX
                                         F3

-------
emissions.  Absent a transient NOX standard, the EGR system could be turned off for a long
period under transient operation, leading to substantially higher NOX emissions than what
would be expected based upon a steady state emission test level alone. The extent of this
increase in NOX emissions is dependent upon the degree of transient operation (the relative
change in engine load). To the extent that load transient are less severe or not extended, the
differences in the resulting NOX emissions would be less evident.

       The lack of a transient emission test procedure for nonroad engines is  a concern to
the Agency, because we know that PM emissions realized in use can be significantly higher
than the steady-state emission level set by the PM standards. Similarly, we have concerns
that NOX emissions under transient conditions may be higher than indicated by the steady
state emissions test and the associated standards. We are therefore working to develop a
more comprehensive set of emission test requirements for nonroad engines to include a
transient test element. In the absence of such a test procedure for Tier 3 engines, we
believe that it is prudent to try to characterize these in-use emissions by increasing the
TAFs applied for NOX and PM emissions for Tier 3 engines  from the level estimated for
Tier 2 engines.  Since Tier 3 engines are not available to provide test data to establish the
level of adjustment required, we have applied engineering judgement to estimate the level
of increase  in emissions. For PM we have estimated that the TAP will increase by 20
percent due to the lack of a transient test and the inherent reduction in average A/F ratio
values due to the use of EGR. Given the highly transient nature of some nonroad diesel
engine applications the actual level of increase could be even higher.  In the absence of
more definitive data we believe that a 20 percent increase in the TAP is appropriate. We
intend to investigate this issue further when Tier 3 engines become available for testing.
We also believe that the NOX TAP should be adjusted in a similar manner. For NOX we
believe that a 10 percent increase in the TAP is appropriate given the characteristics of
EGR systems as we understand them today.  We believe that nonroad engine manufacturers
will choose to modulate EGR rates during high load change transient operation in order to
limit PM emissions increases. This will lead to an increase in NOX emission for the period
that the EGR rate is modulated below the steady-state level.  For example, a 10 percent
increase in NOX emissions could correspond to an EGR rate of zero for 10 percent of the
time (a duty cycle of 90 percent moderate transient and  steady-state operation and 10
percent highly transient operation) assuming that NOX emissions double when the EGR
flow is zero. For some applications with extreme transient operations it is conceivable that
the increase in emission could be even higher.  As with  PM, we intend to investigate the
actual level of NOX emissions when Tier 3 engines become available.

Applying In-use Adjustment Factors

       To apply the in-use adjustment factors listed in Table F5 to the entire CI equipment
population, EPA matched nonroad applications with the test cycle that most closely
represents the nonroad activity for the application. Table F6 lists the nonroad applications
used in the NONROAD model and the in-use adjustment most representative of that
                                        F4

-------
application. If steady-state operation is typical of an application no adjustment was made,
and the cycle adjustment is listed as 'none'.

      Table A3 presents the resulting TAFs assigned to each equipment application. The
steady-state emission factors given in Table A2 were then multiplied by the appropriate in-
use adjustment factor to create NONROAD's emission factor inputs for CI engines.

Comparison with Previous Draft Versions of NONROAD

      Table F7 presents a comparison of TAP methodologies used in the various draft
versions of NONROAD.

References

(1) EPA, "Nonroad Engine and Vehicle Emission Study" (NEVES), U.S. EPA, Office of
Air and Radiation, 21A-2001. November, 1991

(2) Fritz, S. G. and M.E. Starr, "Emission Factors for Compression Ignition Nonroad
Engines Operated on Number 2 Highway and Nonroad Diesel Fuel," Southwest Research
Institute.  EPA contract # 68-C5-0077,  SwRI 08-7601-822, March 1998.

(3) Starr, M.E., "Nonroad Engine Emissions Testing," Southwest Research Institute. EPA
contract # 68-C5-0076 and 68-C-98-169, September 1999.
                                       F5

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Table F2. CI Engine Emissions Data Used to Calculate Transient Adjustment Factors
Engine
(reference)
Caterpillar 3 116 (2)
Caterpillar 3054 (2)
John Deere 4039 (2)
John Deere 7076 (2)
Consolidated Diesel
6TA-830 (2)
John Deere 66 19 (2)
Consolidated Diesel
4039 (2)
Caterpillar 3306 (2)
John Deere 6 10 1(2)
John Deere 6101(same
engine) retested (3)
Tier
0
0
0
0
0
0
0
0
1
1
Test Cycle
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
HC
(g/hp-hr)
0.07
0.04
0.36
0.09
0.66
0.46
1.22
0.51
0.41
0.2
1
0.33
0.53
0.54
1.13
0.52
0.86
0.9
2.08
0.83
0.82
0.87
1.99
0.8
1.32
0.86
2.89
1.22
1.27
1.33
2.3
1.16
0.47
0.50
1.07
0.51
0.50
0.46
0.93
CO
(g/hp-hr)
2.51
0.75
7.47
7.3
1
0.47
3.34
1.06
2.17
0.56
2.62
1.42
2.05
0.57
4.82
2 22
1.5
1.07
9.86
3.76
4.69
1.16
6.89
3.31
3.37
2.5
3.31
2.1
1.46
0.82
5.14
2.7
0.86
0.32
1.92
1.17
1.17
0.44
1.90
NOX
(g/hp-hr)
9.38
9.4
9.46
8.7
7.53
9.46
5.45
8.28
11.22
11.7
9.57
11.7
10.22
9.45
14.35
10.14
6.53
5.62
6.69
6.06
7.29
6.77
8.29
7.01
7.57
7.28
6.52
7.4
6.52
6.46
7.22
6.54
5.55
4.93
6.36
5.25
5.73
5.16
6.04
PM
(g/hp-hr)
0.406
0.28
0.652
0.713
0.387
0.263
0.759
0.384
0.384
0.173
0.447
0.254
0.25
0.168
0.522
0.303
0.397
0.304
1.698
0.805
0.662
0.283
1.102
0.698
0.581
0.43
0.725
0.413
0.248
0.201
0.813
0.436
0.186
0.125
0.430
0.246
0.219
0.130
0.430
BSFC
(Ib/hp-hr)
0.352
0.357
0.411
0.362
0.393
0.377
0.446
0.372
0.389
0.361
0.471
0.372
0.385
0.366
0.493
0.37
0.365
0.377
0.438
0.37
0.397
0.4
0.466
0.398
0.389
0.367
0.436
0.364
0.373
0.372
0.415
0.37
0.350
0.362
0.434
0.362
0.363
0.355
0.419
                                    F6

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Table F2. CI Engine Emissions Data Used to Calculate Transient Adjustment Factors
Engine
(reference)

John Deere 6101 (same
engine) retested
John Deere 6 101
(average of three tests)
Caterpillar 3 176 (3)
MX270 (3)
MX240 (3)
Tier

1
1
1
1
1
Test Cycle
Crawler Tractor
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Excavator
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Excavator
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Dozer
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Tractor
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
ISO-C1 8-mode
Agricultural Tractor
Backhoe Loader
Crawler Tractor
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
HC
(g/hp-hr)
0.47
0.46
0.39
0.68
0.37
0.67
0.48
0.45
0.89
0.45
0.67
0.08
0.08
0.12
0.06
0.11
0.06
0.09
0.04
0.07
0.09
0.20
0.06
0.05
0.12
0.05
0.09
0.13
0.27
CO
(g/hp-hr)
1.14
0.95
0.39
1.58
1.33
0.40
0.99
0.38
1.80
1.21
0.40
1.78
1.47
4.12
2.67
0.40
0.30
1.30
0.78
1.32
0.68
1.28
0.51
0.26
1.06
1.04
2.07
1.00
1.65
NOX
(g/hp-hr)
5.50
5.75
5.24
6.09
5.61
4.92
5.68
5.11
6.16
5.45
4.92
5.51
5.39
7.20
5.61
4.51
4.33
4.49
4.11
4.33
4.15
5.39
4.32
4.02
4.63
3.99
4.18
4.25
6.15
PM
(g/hp-hr)
0.250
0.19
0.11
0.33
0.24
0.171
0.20
0.12
0.40
0.24
0.171
0.183
0.180
0.290
0.230
0.096
0.090
0.200
0.140
0.180
0.160
0.190
0.116
0.090
0.200
0.160
0.250
0.210
0.260
BSFC
(Ib/hp-hr)
0.357





0.36
0.36
0.43
0.36

0.333
0.330
0.367
0.334
0.340
0.332
0.382
0.341
0.350
0.374
0.442
0.351
0.340
0.380
0.342
0.368
0.379
0.451
                                    F7

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Table F3. CI Transient Adjustment Factors for Various Nonroad Test Cycles
Engine
Caterpillar 3 116
Caterpillar 3054
John Deere 4039
John Deere 7076
Consolidated Diesel
6TA-830
John Deere 66 19
Consolidated Diesel
4039
Caterpillar 3306
John Deere 6 101
(average of three tests)
Caterpillar 3 176
MX270
MX240
Tier
0
0
0
0
0
0
0
0
1
1
1
1
Test Cycle
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Excavator
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
Agricultural Tractor
Backhoe Loader
Crawler Dozer
HC
0.57
5.14
1.29
0.70
1.85
0.77
0.49
2.44
0.80
1.02
2.13
0.98
1.05
2.42
0.97
1.06
2.43
0.98
0.65
2.19
0.92
1.05
1.81
0.91
0.99
2.06
1.01
1.40
1.00
1.50
0.75
0.55
0.82
0.36
0.64
0.82
1.82
0.83
2.00
0.83
CO
0.30
2.98
2.91
0.47
3.34
1.06
0.26
1.21
0.65
0.28
2.35
1.08
0.71
6.57
2.51
0.25
1.47
0.71
0.74
0.98
0.62
0.56
3.52
1.85
0.37
1.88
1.14
0.44
0.83
2.31
1.50
0.75
3.25
1.95
3.30
1.70
3.20
0.51
2.08
2.04
NOX
1.00
1.01
0.93
1.26
0.72
1.10
1.04
0.85
1.04
0.92
1.40
0.99
0.86
1.02
0.93
0.93
1.14
0.96
0.96
0.86
0.98
0.99
1.11
1.00
0.89
1.10
0.95
0.87
0.98
1.31
1.02
0.96
1.00
0.91
0.96
0.92
1.20
0.93
1.07
0.92
PM
0.69
1.61
1.76
0.68
1.96
0.99
0.45
1.16
0.66
0.67
2.09
1.21
0.77
4.28
2.03
0.43
1.66
1.05
0.74
1.25
0.71
0.81
3.28
1.76
0.63
2 12
1.22
0.89
0.98
1.58
1.26
0.94
2.08
1.46
1.88
1.67
1.98
0.78
1.72
1.38
BSFC
1.01
1.17
1.03
0.96
1.13
0.95
0.93
1.21
0.96
0.95
1.28
0.96
1.03
1.20
1.01
1.01
1.17
1.00
0.94
1.12
0.94
1.00
1.11
0.99
1.01
1.20
1.01
1.03
0.99
1.10
1.00
0.98
1.12
1.00
1.03
1.10
1.30
0.97
1.08
0.97
                                   F8

-------
 Table F3. CI Transient Adjustment Factors for Various Nonroad Test Cycles
Engine

Average of
Individual TAFs
Standard Deviation
of TAFs
Student's f-test:
P value*
TO vs Tl
Tier




Test Cycle
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
Excavator
Agricultural Tractor
Backhoe Loader
Crawler Dozer
Typ Rubber-Tire Loader
Typ Skid-Steer Loader
Typ Arc Welder
Agricultural Tractor
Backhoe Loader
Crawler Dozer
HC
1.50
2.17
4.50
0.83
2.23
0.88
1.07
1.49
3.16
1.40
0.22
1.02
0.22
0.61
0.95
1.90
0.90
0.13
0.11
CO
4.06
1.96
3.24
0.50
2.66
1.50
3.68
1.83
3.22
0.44
0.21
1.49
0.75
0.54
0.18
0.02
0.21
0.67
0.64
NOX
0.97
0.98
1.42
0.98
1.05
0.98
0.96
0.95
1.31
0.87
0.10
0.19
0.06
0.01
0.04
0.16
0.40
0.40
0.26
PM
2.16
1.81
2.24
0.71
2.07
1.29
2.02
1.74
2.11
0.89
0.17
0.88
0.42
0.20
0.10
0.19
0.08
0.63
0.83
BSFC
1.05
1.08
1.28
0.98
1.16
0.99
1.04
1.09
1.29
1.03
0.03
0.06
0.03
0.01
0.01
0.01
0.77
0.17
0.36
* P value > 0.05 indicates that the difference between the Tier 0 and Tier 1 values is not statistically
significant.
                                           F9

-------
 Table F4.  CI Cycle Transient Adjustment Factors Binned by Load Factor Category
Cycle
None (steady-state)
Agricultural Tractor
Backhoe/Loader
Crawler Dozer
Rubber-Tire Loader
Skid-Steer Loader
Arc Welder
Excavator
Cycle
Load
Factors*
N/A
0.78
0.21
0.58
0.48
0.23
0.19
0.53

Assignment
None
HiLF
LoLF
HiLF
HiLF
LoLF
LoLF
HiLF
HC
Cycle TAFs
1.00
0.83
2.23
0.88
1.07
1.49
3.16
1.40
New TAFs
1.00
1.05
2.29
1.05
1.05
2.29
2.29
1.05
CO
Cycle TAFs
1.00
0.50
2.66
1.50
3.68
1.83
3.22
0.44
New TAFs
1.00
1.53
2.57
1.53
1.53
2.57
2.57
1.53
NOX
Cycle TAFs
1.00
0.98
1.05
0.98
0.96
0.95
1.31
0.87
New TAFs
1.00
0.95
1.10
0.95
0.95
1.10
1.10
0.95

avg Hi LF
avg Lo LF
1.05
2.29


1.53
2.57


0.95
1.10


Cycle
None (steady-state)
Agricultural Tractor
Backhoe/Loader
Crawler Dozer
Rubber-Tire Loader
Skid-Steer Loader
Arc Welder
Excavator
Cycle
Load
Factors*
N/A
0.78
0.21
0.58
0.48
0.23
0.19
0.53

Assignment
None
HiLF
LoLF
HiLF
HiLF
LoLF
LoLF
HiLF
PM
Cycle TAFs
1.00
0.71
2.07
1.29
2.02
1.74
2.11
0.89
New TAFs
1.00
1.23
1.97
1.23
1.23
1.97
1.97
1.23
BSFC
Cycle TAFs
1.00
0.98
1.16
0.99
1.04
1.09
1.29
1.03
New TAFs
1.00
1.01
1.18
1.01
1.01
1.18
1.18
1.01

avg Hi LF
avg Lo LF
1.23
1.97


1.01
1.18


* The load factors shown were obtained from engine test data and are not used directly in NONROAD.
                                                      F10

-------
 Table F5.  CI Transient Adjustment Factors in Draft NONROAD2002
Assignment
avg Hi LF
avg Lo LF
None
HC
All Tiers
1.05
2.29
1.00
CO
All Tiers
1.53
2.57
1.00
NOX
Base,
Tiers 0-2
0.95
1.10
1.00
Tier 3*
1.04
1.21
1.10
PM
Base,
Tiers 0-2
1.23
1.97
1.00
Tier 3*
1.47
2.37
1.20
BSFC
All Tiers
1.01
1.18
1.00
* NOX Tier 3 TAF = 1.1*(NOX Base, Tiers 0-2 TAF).  PM Tier 3 TAF = 1.2*(PM Base, Tiers 0-2 TAF).
The NOX and PM Tier 3 adjustment factors were incorrectly applied to steady-state equipment types (i.e.,
those with cycle assignments of "None.").  This will be corrected in the next version of the model.
                                            Fll

-------
Table F6. CI Transient Adjustment Factor Assignments by Equipment Type
sec
2270001000
2270001020
2270001030
2270001040
2270001050
2270001060
2270002003
2270002006
2270002009
2270002015
2270002018
2270002021
2270002024
2270002027
2270002030
2270002033
2270002036
2270002039
2270002042
2270002045
2270002048
2270002051
2270002054
2270002057
2270002060
2270002063
2270002066
2270002069
2270002072
2270002075
2270002078
2270002081
2270003010
2270003020
2270003030
2270003040
2270003050
2270003060
2270003070
2270004000
2270004010
227000401 1
2270004015
2270004016
2270004020
2270004021
Equipment Type
Recreational Vehicles All
Recreational Vehicles Snowmobiles
Recreational Vehicles All Terrain Vehicles
Recreational Vehicles Minibikes
Recreational Vehicles Golf Carts
Recreational Vehicles Speciality Vehicle Carts
Construction Equipment Pavers
Construction Equipment Tampers/Rammers
Construction Equipment Plate Compactors
Construction Equipment Rollers
Construction Equipment Scrapers
Construction Equipment Paving Equipment
Construction Equipment Surfacing Equipment
Construction Equipment Signal Boards
Construction Equipment Trenchers
Construction Equipment Bore/Drill Rigs
Construction Equipment Excavators
Construction Equipment Concrete/Industrial Saws
Construction Equipment Cement & Mortar Mixers
Construction Equipment Cranes
Construction Equipment Graders
Construction Equipment Off-highway Trucks
Construction Equipment Crushing/Proc. Equipment
Construction Equipment Rough Terrain Forklifts
Construction Equipment Rubber Tire Loaders
Construction Equipment Rubber Tire Dozers
Construction Equipment Tractors/Loaders/Backhoes
Construction Equipment Crawler Dozer
Construction Equipment Skid Steer Loaders
Construction Equipment Off-Highway Tractors
Construction Equipment Dumpers/Tenders
Construction Equipment Other Construction Equipment
Industrial Equipment Aerial Lifts
Industrial Equipment Forklifts
Industrial Equipment Sweepers/Scrubbers
Industrial Equipment Other General Industrial Equipment
Industrial Equipment Other Material Handling Equipment
Industrial Equipment AC\Refrigeration
Terminal Tractors
Lawn & Garden Equipment ALL
Lawn & Garden Equipment Lawn mowers (Residential)
Lawn & Garden Equipment Lawn mowers (Commercial)
Lawn & Garden Equipment Rotary Tillers < 6 HP
Lawn & Garden Equipment Rotary Tillers < 6 HP
(Commercial)
Lawn & Garden Equipment Chain Saws < 6 HP
Lawn & Garden Equipment Chain Saws < 6 HP
(Commercial')
Representative
Cycle
Backhoe
None
None
None
None
Backhoe
Crawler
None
None
Crawler
Crawler
Crawler
Crawler
None
Crawler
None
Excavator
Crawler
None
None
Crawler
Crawler
None
RTLoader
RTLoader
Crawler
Backhoe
Crawler
SSLoader
Crawler
Backhoe
Crawler
Backhoe
RTLoader
None
None
Backhoe
None
Crawler
None
None
None
None
None
None
None
TAP
Assiqnment
LoLF
None
None
None
None
LoLF
HiLF
None
None
HiLF
HiLF
HiLF
HiLF
None
HiLF
None
HiLF
HiLF
None
None
HiLF
HiLF
None
HiLF
HiLF
HiLF
LoLF
HiLF
LoLF
HiLF
LoLF
HiLF
LoLF
HiLF
None
None
LoLF
None
HiLF
None
None
None
None
None
None
None
                                  F12

-------
Table F6. CI Transient Adjustment Factor Assignments by Equipment Type
sec
2270004025
2270004026
2270004030
2270004031
2270004035
2270004036
2270004040
2270004041
2270004045
2270004046
2270004050
2270004051
2270004055
2270004056
2270004060
2270004061
2270004065
2270004066
2270004071
2270004075
2270004076
2270005010
2270005015
2270005020
2270005025
2270005030
2270005035
2270005040
2270005045
2270005050
2270005055
2270005060
2270006000
2270006005
2270006010
2270006015
2270006020
2270006025
2270006030
2270007005
2270007010
2270007015
Equipment Type
Lawn & Garden Equipment Trimmers/Edgers/Brush
Cutters
Lawn & Garden Equipment Trimmers/Edgers/Brush
Cutters (Commercial)
Lawn & Garden Equipment Leafblowers/Vacuums
Lawn & Garden Equipment Leafblowers/Vacuums
(Commercial')
Lawn & Garden Equipment Snowblowers
Lawn & Garden Equipment Snowblowers (Commercial)
Lawn & Garden Equipment Rear Engine Riding Mowers
Lawn & Garden Equipment Rear Engine Riding Mowers
(Commercial')
Lawn & Garden Equipment Front Mowers
Lawn & Garden Equipment Front Mowers (Commercial)
Lawn & Garden Equipment Shredders < 6 HP
Lawn & Garden Equipment Shredders < 6 HP
(Commercial)
Lawn & Garden Equipment Lawn & Garden Tractors
Lawn & Garden Equipment Lawn & Garden Tractors
(Commercial')
Lawn & Garden Equipment Wood Splitters
Lawn & Garden Equipment Wood Splitters (Commercial)
Lawn & Garden Equipment Chippers/Stump Grinders
Lawn & Garden Equipment Chippers/Stump Grinders
(Commercial)
Lawn & Garden Equipment Commercial Turf Equipment
(Commercial)
Lawn & Garden Equipment Other Lawn & Garden
Equipment
Lawn & Garden Equipment Other Lawn & Garden
Equipment (Commercial)
Farm Equipment 2-Wheel Tractors
Farm Equipment Agricultural Tractors
Farm Equipment Combines
Farm Equipment Balers
Farm Equipment Agricultural Mowers
Farm Equipment Sprayers
Farm Equipment Tillers > 6 HP
Farm Equipment Swathers
Farm Equipment Hydro Power Units
Farm Equipment Other Agricultural Equipment
Farm Equipment Irrigation Sets
Light Commercial ALL
Light Commercial Generator Sets
Light Commercial Pumps
Light Commercial Air Compressors
Light Commercial Gas Compressors
Light Commercial Welders
Light Commercial Pressure Washers
Logging Equipment Chain Saws > 6 HP
Logging Equipment Shredders > 6 HP
Logging Equipment Forest Equipment
Representative
Cycle
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
AgTractor
AgTractor
AgTractor
AgTractor
AgTractor
AgTractor
AgTractor
AgTractor
None
AgTractor
None
None
None
None
None
None
ArcWelder
None
RTLoader
RTLoader
RTLoader
TAP
Assiqnment
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
HiLF
None
HiLF
None
None
None
None
None
None
LoLF
None
HiLF
HiLF
HiLF
                                  F13

-------
Table F6. CI Transient Adjustment Factor Assignments by Equipment Type
sec
2270008005
2270009010
2270010010
2282020005
2282020010
2282020015
2282020025
2285002015
Equipment Type
Airport Service Equipment Airport Support Equipment
Other Underground Mining Equipment
Other Oil Field Equipment
Recreational Pleasure Craft, Inboards
Recreational Pleasure Craft, Outboards
Recreational Pleasure Craft, Personal Water Craft
Recreational Pleasure Craft, Sailboat Aux. Outboard
Railway Maintenance
Representative
Cycle
RTLoader
Backhoe
None
None
None
None
None
Backhoe
TAP
Assiqnment
HiLF
LoLF
None
None
None
None
None
LoLF
Table F7. Comparison of TAP Methodology Used in Draft Versions of NONROAD
Model Date
June 1998
April 1999
June 2000
Nov 2000
Oct 2001
March 2002
Model
Version
Name
"Original"
"Tier 2"
"2007 HD
Rule"
"Final
Finding /
ANPRM"
"Pentathalon
NPRM"
"NONROAD
2002"
Data as Basis
(# of engines)
9 engines
(8 Tier 0 and 1
Tier 1 engines)
Cycles Used
Ag tractor
Backhoe Loader
Crawler Dozer
Treatment
of Tier 0 vs
Tier 1 Data
Tier 0 and
Tier 1 data
combined
Ratio of
Averages
or Average
of Ratios?
Ratio of
averages
TAFs Used
and
Assignments
3 cycle TAFs.
One assigned
to each
equipment type
No TAF-related changes
12 engines
(8 Tier 0 and 4
Tier 1 engines)
Ag tractor
Backhoe Loader
Crawler Dozer
RT Loader
SS Loader
Arc Welder
Tier 0 and
Tier 1 data
separated;
separate
TAFs for
each
Ratio of
averages
Revised to
accomodate
separate TO
and T1 TAFs
and 3
additional
cycles
No TAF related changes relative to June 2000 version
12 engines
(8 Tier 0 and 4
Tier 1 engines)
12 engines
(8 Tier 0 and 4
Tier 1 engines)
Ag tractor
Backhoe Loader
Crawler Dozer
RT Loader
SS Loader
Arc Welder
Ag tractor
Backhoe Loader
Crawler Dozer
RT Loader
SS Loader
Arc Welder
Excavator
Tier 0 and
Tier 1 data
re-combined
Tier 0 and
Tier 1 data
combined
Average of
ratios
Average of
ratios
6 cycle TAFs.
One assigned
to each
equipment type
7 cycle TAFs
binned in two
categories: Hi
LF and Lo LF.
One assigned
to each
equipment
type.
                                   F14

-------
GO

-------
                                   Appendix G
                      Derivation of Deterioration Factors for
                      Nonroad Compression Ignition Engines

       Deterioration factors used in emissions models are intended to account for increases
in emissions above a new engine or vehicle's base emissions level with time. Emissions
can increase with time for a number of reasons including, engine wear, poor maintenance
practices, and willful or unwitting tampering with emission control systems.  Emissions
from diesel engines increase with time (deteriorate) at a very slow rate when the engine is
properly maintained and operated.  In fact for a number of pollutants (primarily NOX),
emission levels can actually drop slightly as the engine ages.  However, anecdotal and
emission test experience suggests that many diesel engines emit at a much higher level in-
use (especially PM) than would be anticipated for a well maintained diesel engine.

       Diesel engines are extremely robust and can continue to provide adequate
performance for a user, even when they have been poorly maintained. Unlike speed and
load characterized performance, however, their emissions performance can decrease quite
rapidly when the engine receives poor maintenance.  Analysis and testing conducted by
contractors to EPA and to the California  Air Resources Board (CARB) have shown that
these maintenance and tampering issues comprise the bulk of the observed increase in PM
emissions from diesel engines in-use. (1) When CARB updated the large CI component of
its OFFROAD model in 2000, they accounted for this increase in emissions by using
deterioration factors developed  from real world observations of in-use PM emissions
correlated to particular engine technologies. (2) We believe that this is the appropriate
approach for PM emission modeling in order to account for all of the possible mechanisms
of PM deterioration. We have therefore adopted the PM deterioration factors from
CARS's OFFROAD model in this version of NONROAD. We averaged the highway-
                                        Gl

-------
based LDDT, MHDT, and HHDT PM deterioration factors used in CARS's OFFROAD
model (0.31, 0.44, and 0.67, respectively) and applied the average (0.473) to all tiers.

       For HC, CO, and NOX, we have continued our practice of using deterioration factors
developed by manufacturers based upon well maintained engines.  We have done so
because we believe that maintenance and tampering issues do not effect the emission rates
of these pollutants as dramatically. As a result, we base the HC, CO, and NOX deterioration
factors adopted for nonroad engines on highway certification data (zero-mile levels and
lifetime deterioration) (3). We used the same data to derive highway compliance margins
for the steady-state emission factor analysis.  Correspondence between highway weight
class (light, medium, heavy), highway model-year group, and nonroad horsepower
categories is identical to that used for the steady-state emission factor analysis.
       We converted the highway engine deterioration estimates into a format applicable to
nonroad engines, following these steps:

(1)    We calculated absolute deterioration rates DFafa using the zero-mile emission
       factors and lifetime deterioration estimates presented in reference (3).
(2)    We converted the absolute deterioration rates DFafa (g/hp-hr2) to relative
       deterioration rates DFre/ (% emissions increase/% useful life expended).
(3)    We calculated a separate DFre/ for each combination of pollutant, Tier, and
       horsepower category.  Then to derive a single value for each Tier and pollutant, we
       simply averaged the DFre/.

We discuss these calculations in greater detail below.

       To adapt highway-certification deterioration rates for application to nonroad
engines, it was necessary to convert them from an absolute basis (emissions increase over
engine's useful life (g/hp-hr)) to a relative basis (% emissions increase/% useful life
expended). This conversion involves relating the emissions increase over the engine's
useful life to the zero-hour emission factor, in proportional terms.

       We achieved this conversion as follows.  To begin, if we assume linear deterioration
with the intercept at the zero-mile emission factor, (0 deterioration increase at 0 miles (0
hours useful life)), it is possible to calculate the absolute slope of the line, i.e., the absolute
deterioration rate DFafa (g/hp-hr2) (Figure 1 on next page).  The required data are the
absolute emissions increase DT (g/hp-hr) over engine's useful life L (years) and the zero-
mile emission factor EFzm (g/hp-hr):
                                         G2

-------
                 DF        AL      (EFzm+Dr)-EFzm   =  Dj_
                    abs      Ax              L - 0              L

       Dividing the numerator and denominator by EFzm and L, respectively, and
multiplying each by 100 expresses the deterioration factor in  percentage terms with respect
to emissions increase and useful life, giving a relative deterioration rate DFre/ (% emissions
increase/% useful life):
                                    ( D   "
                                         .400
                                       1_J

       Thus, the relative deterioration rate is the quotient of the absolute emissions
increase and the zero-mile emission factor.  Tables G1-G3 present estimates of DFre/ for
each combination of pollutant, Tier and horsepower category.  To derive individual values
of DFre/ for each pollutant and Tier, we calculated simple unweighted averages.

The resulting DFre/ for  each pollutant and Tier are presented in Table G4.

       We intend to continue to monitor in-use PM emissions levels, and as the body of
data increases (especially for newer engine technologies), we intend to further update the
deterioration factors used here.  Similarly, if we  learn that deterioration rates for other
pollutants also increase significantly in-use, we will update those factors as well.

References
                                         G3

-------
(1) Engine, Fuel and Emissions Engineering, Inc., "Modeling Deterioration in Heavy-Duty
Diesel Paniculate Emissions," report prepared for U.S. Environmental Protection Agency,
1998.

(2) ARB, "Public Meeting to Consider Approval of the Emissions Inventory of Off-Road
Large Compression-Ignited (CI) Engines (>25HP)," January 2000.

(3) EPA, "Update of Heavy-Duty Emission Levels (Model Years 1988-2004+) for Use in
MOBILE6," EPA420-R-99-010,  April 1999.
      y
     in
     c
     o


     
-------
Table Gl.  Hydrocarbon (HC) Deterioration Factors by Tier and
Horsepower Category
Nonroad
Engine
Power
Categories
(hp)


<11
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750

<11

Corresponding
Highway
Vehicle Weight
Class1


LHDD
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD

LHDD

Corresponding
Highway Model-
Year Group


1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89

1994-97


Corresponding Highway Certification
Deterioration Factors
EFZM2
(g/hp-hr)

0.64
0.64
0.64
0.66
0.66
0.66
0.47
0.47
0.47

0.26
DT>
(g/hp-hr)
TierO
0.02
0.02
0.02
0.05
0.05
0.05
0.02
0.02
0.02
Tiers 1-3
0.01

Test Results and
DF 4
Ur rel
(%increase/%
useful life)

0.031
0.031
0.031
0.068
0.068
0.068
0.043
0.043
0.043

0.038
                                G5

-------
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD
1994-97
1994-97
1994-97
1994-97
1994-97
1994-97
1994-97
1994-97
0.26
0.26
0.31
0.31
0.31
0.22
0.22
0.22
0.01
0.01
0.00
0.00
0.00
0.02
0.02
0.02
0.038
0.038
0.000
0.000
0.000
0.068
0.068
0.068
1 LHDD = "light heavy-duty diesel," MHDD = "medium heavy-duty diesel," and HHDD = "heavy heavy-duty diesel."
2 Zero-mile emission factor, Source: USEPA 1999, Table 8.
3 Lifetime Deterioration (cumulative deterioration over vehicle useful life), Source USEPA 1999, Table 8.
4 Relative Deterioration Factor, calculated as D/EFzln. For discussion, see text.
                                                          G6

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Table G2. CO Deterioration Factors by Tier and Horsepower Category1
Nonroad
Engine
Power
Categories
(hp)


<11
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750

<11
11-25

Corresponding
Highway
Vehicle Weight
Class1


LHDD
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD

LHDD
LHDD

Corresponding
Highway Model-
Year Group


1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89

1994-97
1994-97



Corresponding Highway Certification Test Results and
Deterioration Factors
EFZM2
(g/hp-hr)

1.22
1.22
1.22
1.70
1.70
1.70
1.36
1.36
1.36

1.20
1.20
DT*
(g/hp-hr)
TierO
0.24
0.24
0.24
0.33
0.33
0.33
0.22
0.22
0.22
Tiers 1-3
0.03
0.03
DF 4
Ur rel
(%increase/%
useful life)

0.198
0.198
0.198
0.195
0.195
0.195
0.162
0.162
0.162

0.021
0.021
                                 G7

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25-50
50-100
100-175
175-300
300-600
600-750
>750
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD
1994-97
1994-97
1994-97
1994-97
1994-97
1994-97
1994-97
1.20
0.88
0.88
0.88
1.07
1.07
1.07
1 LHDD = "light heavy-duty diesel," MHDD = "medium heavy-duty diesel," and HHDD =
2 Zero-mile emission factor, Source: USEPA 1999, Table 9.
3 Lifetime Deterioration (cumulative deterioration over vehicle useful life), Source USEPA
4 Relative Deterioration Factor, calculated as D/EFzln. For discussion, see text.
0.03
0.17
0.17
0.17
0.10
0.10
0.10
"heavy heavy-duty diesel.
1999, Table 9.
0.021
0.189
0.189
0.189
0.093
0.093
0.093

G8

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Table G3.  NOx Deterioration Factors by Pollutant and Horsepower Category1
Nonroad
Engine Power
Categories
(hp)


<11
11-25
25-50
50-100
100-175
175-300
300-600
600-750
>750

<11
11-25
25-50
50-100

Corresponding
Highway Vehicle
Weight Class1


LHDD
LHDD
LHDD
MHDD
MHDD
MHDD
HHDD
HHDD
HHDD

LHDD
LHDD
LHDD
MHDD

Corresponding
Highway Model-
Year Group


1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89
1988-89

1991-93
1991-93
1991-93
1998-2003


Corresponding Highway Certification
Deterioration Factors
EFZM2
(g/hp-hr)

4.34
4.34
4.34
6.43
6.43
6.43
6.28
6.28
6.28

4.28
4.28
4.28
4.67
DT*
(g/hp-hr)
Tier 0-1
0.02
0.02
0.02
0.16
0.16
0.16
0.28
0.28
0.28
Tier 2
0.01
0.01
0.01
0.03

Test Results and
DF 4
Ur rel
(%increase/%
useful life)

0.005
0.005
0.005
0.025
0.025
0.025
0.044
0.044
0.044

0.003
0.003
0.003
0.006
                                 G9

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100-175
175-300
300-600
600-750
>750

50-100
100-175
175-300
300-600
600-750
MHDD
MHDD
HHDD
HHDD
HHDD

MHDD
MHDD
MHDD
HHDD
HHDD
1998-2003
1998-2003
1998-2003
1998-2003
1998-2003

1998-2003
1998-2003
1998-2003
1998-2003
1998-2003
4.67
4.67
4.70
4.70
4.70

4.67
4.67
4.67
4.70
4.70
0.03
0.03
0.05
0.05
0.05
Tier 3
0.03
0.03
0.03
0.05
0.05
0.006
0.006
0.011
0.011
0.011

0.006
0.006
0.006
0.011
0.011
1 LHDD = "light heavy-duty diesel," MHDD = "medium heavy-duty diesel," and HHDD = "heavy heavy-duty diesel/
2 Zero-mile emission factor, Source: USEPA 1999, Table 10.
3 Lifetime Deterioration (cumulative deterioration over vehicle useful life), Source USEPA 1999, Table 10.
4 Relative Deterioration Factor, calculated as Dj/EFzm. For discussion, see text.
Table G4.   Deterioration Factors for Nonroad Diesel Engines

Pollutant               Relative Deterioration Factor (DFrel) (% increase/%useful life)1

HC
CO
NOx
PM
Base/Tier 0
0.047
0.185
0.024
0.473
Tier 1
0.036
0.101
0.024
0.473
Tier 2
0.034
0.101
0.009
0.473
TierS
0.027
0.151
0.008
0.473
JDFre/ = A in the equation:  DF =l+A*(fraction of useful life expended)2
                                            G10

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