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2020 National Emissions Inventory Technical
Support Document: Fuel Combustion -
Residential Heating -Natural Gas, Oil, and
Other


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EPA-454/R-23-001z
March 2023

2020 National Emissions Inventory Technical Support Document: Fuel Combustion -
Residential Heating - Natural Gas, Oil, and Other

U.S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Air Quality Assessment Division
Research Triangle Park, NC


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Contents

List of Tables	i

26	Fuel Combustion - Residential Heating - Natural Gas, Oil, and Other	26-1

26.1	Sector Descriptions and Overview	26-1

26.2	Sources of data	26-1

26.3	EPA-developed estimates	26-2

26.3.1	Activity data	26-3

26.3.2	Allocation procedure	26-4

26.3.3	Emission factors	26-6

26.3.4	Controls	26-8

26.3.5	Emissions	26-8

26.3.6	Example calculations	26-9

26.3.7	Improvements/Changes in the 2020 NEI	26-9

26.3.8	Puerto Rico and U.S. Virgin Islands	26-10

26.4	References	26-10

List of Tables

Table 26-1: Non-wood residential fuel combustion SCCs in the 2020 NEI	26-1

Table 26-2: Agencies reporting non-wood residential fuel combustion emissions	26-2

Table 26-3: EIA State Energy Data System Fuel Codes	26-3

Table 26-4: Anthracite and Bituminous Coal Distribution for the Residential and Commercial Sectors 26-3
Table 26-5: S02 and PM Emissions Factors for Residential Anthracite and Bituminous Coal Combustion

	26-6

Table 26-6: State-Specific Sulfur Content for Bituminous Coal (SCC 2104002000)	26-7

Table 26-7: Sample calculations for CO emissions from residential heating from distillate fuel oil	26-9

l


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26 Fuel Combustion - Residential Heating - Natural Gas, Oil, and Other

Residential heating includes the combustion of fuel, including coal, distillate oil, kerosene, natural gas,
and liquefied propane gas (LPG) to heat homes. Common uses of energy associated with this category
include space heating, water heating, and cooking. This category does not include the combustion of
wood from the residential sector, which is estimated separately in Section 27.

26.1	Sector Descriptions and Overview

The EIS sectors documented in this section include these emissions from residential fuel combustion:

•	Fuel Comb - Residential - Natural Gas. Includes fuel natural gas only. Residential natural gas
combustion is natural gas that is burned to heat residential housing as well as in grills, hot water
heaters, and dryers.

•	Fuel Comb - Residential - Oil. Includes the fuels: distillate oil, kerosene, and residual oil. Residual
oil is not an EPA-estimated category, and no agencies submitted data for it in 2020. Residential
distillate oil combustion is oil that is burned in residential housing. Residential kerosene
combustion is kerosene that is burned in residential housing. Common uses of energy associated
with this sector include space heating, water heating, cooking, and running a wide variety of
other equipment.

•	Fuel Comb - Residential - Other: Includes the fuels: coal, liquid petroleum gas (LPG), and
"biomass; all except wood". Note that "biomass; all except wood" is not an EPA-estimated
category and no agency submitted data for it in 2020. Residential coal combustion is coal that is
burned in residential housing. Residential LPG combustion is liquefied propane gas that is
burned in residential housing. Common uses of energy associated with this sector include space
heating, water heating, and cooking.

26.2	Sources of data

Table 26-1 shows, for non-wood Residential heating, the nonpoint SCCs covered by the EPA estimates
and by the State/Local and Tribal agencies that submitted data. The SCC level 3 and 4 SCC descriptions
are also provided. The SCC level 1 and 2 descriptions is "Stationary Source Fuel Combustion; Residential"
for all SCCs. According to the State Energy Data System (SEDS) 2020 Consumption tables published by
the Energy Information Administration (EIA) [ref 1], there was no residential coal combustion in 2020.
However, the old methodology is retained here and provided in an EPA workbook, and as seen in Table
26-1, with zero emissions, in case a state would like to use their own coal consumption data

Table 26-1: Non-wood residential fuel combustion SCCs in the 2020 NEI

SCC

Description

Sector

EPA

SLT

2104002000

Bituminous/Subbituminous Coal;
Total: All Combustor Types

Fuel Comb - Residential - Other

X

X

2104004000

Distillate Oil; Total: All Combustor
Types

Fuel Comb - Residential - Oil

X

X

2104006000

Natural Gas; Total: All Combustor
Types

Fuel Comb - Residential - Natural Gas

X

X

26-1


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2104007000

Liquified Petroleum Gas (LPG);
Total: All Combustor Types

Fuel Comb - Residential - Other

X

X

2104011000

Kerosene; Total: All Heater Types

Fuel Comb - Residential - Oil

X

X

The agencies listed in Table 26-2 submitted emissions for these sectors. Agencies not listed uses EPA
estimates for the entire sector.

Table 26-2: Agencies reporting non-wood residential fuel combustion emissions

Agency

Oil

Other

Natural
Gas

Alaska Department of Environmental Conservation

X

X



California Air Resources Board

X

X

X

Coeur d'Alene Tribe

X

X

X

Delaware Department of Natural Resources and Environmental Control

X

X

X

Idaho Department of Environmental Quality

X

X

X

Illinois Environmental Protection Agency

X

X

X

Kootenai Tribe of Idaho

X

X

X

Maricopa County Air Quality Department

X

X

X

Maryland Department of the Environment

X

X

X

Massachusetts Department of Environmental Protection

X

X

X

Memphis and Shelby County Health Department - Pollution Control

X

X

X

Metro Public Health of Nashville/Davidson County

X

X

X

New Hampshire Department of Environmental Services

X

X

X

New Jersey Department of Environment Protection

X

X

X

New York State Department of Environmental Conservation

X

X

X

Nez Perce Tribe

X

X

X

Northern Cheyenne Tribe



X

X

Shoshone-Bannock Tribes of the Fort Hall Reservation of Idaho

X

X

X

Southern Ute Indian Tribe



X

X

Texas Commission on Environmental Quality

X

X

X

Utah Division of Air Quality



X

X

Washoe County Health District

X

X

X

26.3 EPA-developed estimates

The general approach to calculating emissions for these SCCs is to take state-level fuel consumption
from the EIA State Energy Data System (SEDS) [ref 1] and allocate it to the county level based on data
from the Census Bureau on the number of homes in each county that use each fuel type [ref 2], County-
level fuel consumption is multiplied by emissions factors to calculate emissions.

Note that SEDS no longer includes data on residential coal consumption, as it is assumed to be near
zero, and therefore emissions will be nonexistent for residential coal consumption. However, the
methodology for estimating emissions from coal has been retained if states have additional data on
residential coal consumption that they would like to use.

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The calculations for estimating emissions from residential heating involve distributing state-level energy
consumption data from SEDS to each county based on the proportion of houses in that county that use
each fuel type as a primary fuel source. Additional calculations are necessary to distribute coal
consumption to anthracite or bituminous coal consumption and to distribute fuel oil consumption to
distillate fuel oil and kerosene consumption. County-level consumption of each fuel is multiplied by an
emissions factor to estimate emissions of criteria air pollutants (CAPs) and hazardous air pollutants
(HAPs).

26.3.1 Activity data

The amount of fuel consumed by residential sector in the United States from SEDS [ref 1] is used to
estimate emissions for this source category. The relevant fuel codes from SEDS are shown in Table 26-3.

Table 26-3: EIA State Energy Data System Fuel Codes

Fuel

SEDS Fuel Code

Coal

CLRCP

Distillate fuel oil

DFRCP

Kerosene

KSRCP

Natural Gas

NGRCP

LPG

LGRCP

The SEDS data do not distinguish between anthracite and bituminous/subbituminous coal consumption
estimates. The EIA table "Domestic Distribution of U.S. Coal by Destination State, Consumer, Origin and
Method of Transportation" [ref 3] provides state-level residential coal distribution data for 2006 that is
used to estimate the fraction of coal consumption that is anthracite and bituminous/subbituminous. The
amount of anthracite distributed to each state and the total coal delivered to each state is used to
estimate the proportion of anthracite and bituminous coal consumption. Table 26-4 presents the
anthracite and bituminous coal ratios for each state.

ble 26-4: Anthracite and Bituminous Coal Distri

3ution for the Resic

ential and Commercial Sectc

State

Ratio of
Bituminous

Ratio of
Anthracite

State

Ratio of
Bituminous

Ratio of
Anthracite

Alabama

1.000

0.000

Montana

1.000

0.000

Alaska

1.000

0.000

Nebraska

1.000

0.000

Arizona

0.814

0.186

Nevada

1.000

0.000

Arkansas

0.814

0.186

New Hampshire

0.000

1.000

California

1.000

0.000

New Jersey

0.000

1.000

Colorado

0.996

0.004

New Mexico

1.000

0.000

Connecticut

0.000

1.000

New York

0.600

0.400

Delaware

0.814

0.186

North Carolina

1.000

0.000

Dist. Columbia

1.000

0.000

North Dakota

1.000

0.000

Florida

0.814

0.186

Ohio

0.873

0.127

Georgia

1.000

0.000

Oklahoma

0.917

0.083

Hawaii

1.000

0.000

Oregon

1.000

0.000

Idaho

0.979

0.021

Pennsylvania

0.194

0.806

Illinois

0.998

0.002

Rhode Island

0.000

1.000

26-3


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State

Ratio of

Ratio of

State

Ratio of

Ratio of

Bituminous

Anthracite

Bituminous

Anthracite

Indiana

0.947

0.053

South Carolina

0.997

0.003

Iowa

0.999

0.001

South Dakota

1.000

0.000

Kansas

1.000

0.000

Tennessee

0.994

0.006

Kentucky

0.998

0.002

Texas

0.814

0.186

Louisiana

1.000

0.000

Utah

1.000

0.000

Maine

0.000

1.000

Vermont

0.000

1.000

Maryland

0.929

0.071

Virginia

0.963

0.037

Massachusetts

0.500

0.500

Washington

1.000

0.000

Michigan

0.667

0.333

West Virginia

0.905

0.095

Minnesota

0.997

0.003

Wisconsin

0.991

0.009

Mississippi

1.000

0.000

Wyoming

1.000

0.000

Missouri

1.000

0.000







The SEDS data on residential coal consumption are split into consumption of anthracite and
bituminous/subbituminous coal based on the ratios in Table 26-4.

FCant/bit,s ~ FCCoal,s * ^ant/bit	(1)

Where:

FCant/bit,s = anthracite or bituminous coal consumption in state s, in tons

FCCoai,s = total fuel consumption of coal in state s from SEDS, in tons

Rant/bit = ratio of anthracite or bituminous coal to total coal, as found in Table 26-4

26.3.2 Allocation procedure

State-level fuel consumption is allocated to each county using the US Census Bureau's 5-year estimate
Census Detailed Housing Information [ref 2], which includes the number of housing units using a specific
type of fuel for their primary fuel source. State fuel consumption is allocated to each county using the
ratio of the number of houses using each fuel in each county to the total number of houses using each
fuel in the state.

For most fuels, the fuel type in SEDS matches well to the fuel type used in the Census data. However,
the Census data report only for total fuel oil, which does not distinguish between distillate fuel oil and
kerosene. Therefore, the ratio of distillate fuel oil versus kerosene in the heating fuel oil mix, which is
used to determine the fraction of homes in each county that use distillate and those that use kerosene,
is calculated.

_ FCdfo/ker,s	(2)

Kdfo/ker,s ~pr	, pr

1 udfo,s ~ 1 uker,s

Where:

Rdfo/ker,s = ratio of residential distillate fuel oil or kerosene to total distillate fuel oil and kerosene
in state s

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Adf0/ker,s = fuel consumption of distillate fuel oil or kerosene in state s from SEDS, in thousand
barrels

Then, the ratio of distillate fuel oil or kerosene to total fuel oil is used to determine how many housing
units in each county use distillate fuel oil or kerosene.

HUdfo/ker,c ~ HUf0ic * Rdfo/ker,s	(3)

Where:

HUdf0/ker,c = housing units in county c using distillate fuel oil or kerosene as the primary
heating fuel

HUf0,c = housing units in county c using any fuel oil as primary heating fuel

To distribute the state-level energy consumption data for all fuel types, the ratio of county-level housing
units using each fuel type as primary heating fuel to state-level housing units using that fuel type is
calculated. This ratio is used to distribute state-level fuel consumption to the county level. The county-
level values for housing units using distillate oil and kerosene as primary fuel are calculated in equations
2 and 3 above.

_ HUf,c	(4)

f'c ~ HUf

Jf,S

Where:

R/c = ratio of homes in county c to homes in state s that use fuel /as primary heating fuel
HUf/C = housing units in county c using fuel type/as primary heating fuel
HUf/S = housing units in state s using fuel type/as primary heating fuel

The state-level fuel consumption of each fuel type from SEDS is multiplied by the county-level ratio of
homes using each fuel type. State-level fuel consumption of anthracite and bituminous/subbituminous
coal is calculated in equation 1 in Section 26.3.1.

FCf,c ~ FCf,s x Rf,c	(5)

Where:

FQC = fuel consumption of fuel type/in county c, in tons, thousand barrels, orthousand
cubic feet

FQS = fuel consumption of fuel type/in state s, in tons, thousand barrels, or thousand cubic
feet, from SEDS

R/c = ratio of homes in county c to homes in state s that use fuel /as primary heating fuel

Fuel consumption of distillate fuel oil is converted from barrels to gallons using a conversion factor of 42
gallons per barrel.

26-5


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26.3.3 Emission factors

All emissions factors for CAPs, except ammonia, are from AP-42 [ref 4], The ammonia emissions factor is
from EPA's Estimating Ammonia Emissions from Anthropogenic Sources, Draft Final Report [ref 5], In
some cases, HAP emissions factors are from a memorandum to EPA called "Baseline Emission Inventory
of HAP Emissions from MACT Sources - Interim Final Report" [ref 6],

For many residential heating fuels, the emissions factors for S02 and PM species are adjusted using
sulfur or ash content data for the fuel at the county level. Note that for coal emissions, this step need
only be done if a state supplies data on residential coal consumption, because SEDS currently assumes
zero residential coal consumption.

EFf,s,p = CfS X EFunadjj	(6)

Where:

fFX;P = emissions factor of pollutant p for fuel type/in state s

SACX = sulfur or ash content for fuel type/in state s

EFunadjj = unadjusted emissions factor for fuel type/, from EPA AP-42

A summary of the emissions factors for all fuel types for residential heating: anthracite coal,
bituminous/subbituminous coal, distillate fuel oil, kerosene, LPG, and natural gas factors are provided in
the "Wagon Wheel Emission Factor Compendium" on the 2020 NEI Supporting Data and Summaries site.

For coal combustion, the S02 emission factors are based on the sulfur content of the coal burned, and
some of the PM emission factors for anthracite coal require information on the ash content of the coal.
State-specific coal sulfur contents for bituminous coal are obtained from the ElA's Coal Data Browser
and applied at the county level [ref 7], Bituminous sulfur content data can be found in the Coal
Consumption and Quality Data Set, filtered to only account for commercial and institutional sources. For
anthracite coal, an ash content value of 13.38% and a sulfur content of 0.89% are applied to all counties
except those in New Mexico (ash content 16.61%, sulfur content 0.77%), Washington (ash content 12%,
sulfur content 0.9%), and Virginia (ash content 13.38%, sulfur content 0.43%). Table 26-5 shows the coal
S02 and PM emissions factors. Table 26-6 presents the bituminous coal sulfur content values used for
each state.

Table 26-5: S02 and PM Emissions Factors for Residential Anthracite and Bituminous Coal Combustion

Pollutant

Emissions Factor
(lb/ton)

Data Source,
AP-42 Table No.

Anthracite Emissions Factors (SCC 2104001000)

PM-CON

0.08 * % Ash

1.2-3 (stoker)

PM10-FIL

10

1.2-3 (hand-fired)

PM25-FIL

4.6

Fig. 1.2-1 (ratio of
PM25/PM10=1.25/2.70=0.46)
0.46*10=4.6

PM10-PRI

10 + 0.08 * % Ash

1.2-3

PM25-PRI

4.6 + 0.08 * % Ash

1.2-3 and Fig 1.2-1

Sulfur Dioxide

39 * % Sulfur

1.2-1 (residential space heater)

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Pollutant

Emissions Factor
(lb/ton)

Data Source,
AP-42 Table No.

Bituminous Emissions Factors (SCC 2104002000)

PM-CON

1.04+

1.1-5 (stoker)

PM10-FIL

6.2

1.1-4 (hand-fed)

PM25-FIL

3.8

1.1-11 (underfeed stoker)

PM10-PRI

7.24

Sum of FIL and CON

PM25-PRI

4.84

Sum of FIL and CON

Sulfur Dioxide

31 * % Sulfur

1.1-3 (hand-fed)

Emissions factor provided in AP-42 is 0.04 Ib/MMBtu. This is multiplied by the
conversion factor of 26 MMBtu/ton provided in AP-42 for bituminous coal.

Table 26-6: State-Specific Sulfur Content for Bituminous Coal (SCC 2104002000

State

Percent Sulfur
Content

State

Percent Sulfur
Content

Alabama

0.00

Montana

0.46

Alaska

0.15

Nebraska

0.00

Arizona

0.00

Nevada

0.00

Arkansas

0.00

New Hampshire

0.00

California

0.00

New Jersey

0.00

Colorado

0.31

New Mexico

0.00

Connecticut

0.00

New York

0.00

Delaware

0.00

North Carolina

1.63

District of Columbia

0.51

North Dakota

0.64

Florida

0.00

Ohio

0.88

Georgia

0.00

Oklahoma

0.00

Hawaii

0.00

Oregon

0.00

Idaho

0.00

Pennsylvania

0.83

Illinois

3.21

Rhode Island

0.00

Indiana

2.95

South Carolina

0.00

Iowa

2.60

South Dakota

0.00

Kansas

0.00

Tennessee

0.00

Kentucky

0.71

Texas

0.00

Louisiana

0.00

Utah

0.00

Maine

0.00

Vermont

0.00

Maryland

0.00

Virginia

1.08

Massachusetts

0.00

Washington

0.00

Michigan

0.00

West Virginia

0.00

Minnesota

0.22

Wisconsin

0.78

Mississippi

0.00

Wyoming

0.44

Missouri

3.03





The emissions factors for CO, VOC, and some HAPs for anthracite coal factors are available in the
"Wagon Wheel Emission Factor Compendium" on the 2020 NEI Supporting Data and Summaries site.
Emission rates for these pollutants are dependent upon combustion efficiency, with the mass of
emissions per unit of heat input generally increasing with decreasing unit size. No anthracite emission
rates are provided for residential heaters for these pollutants. Therefore, it was felt that it the AP-42

26-7


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emission rates from bituminous coal that are derived for smaller hand-fed units, are more appropriate
to use than applying anthracite emissions factors derived for much larger boilers.

Note that while AP-42 provides emissions factors for emissions of some metals from coal combustion,
these factors are based on tests at controlled and/or pulverized coal boilers. These test conditions are
not expected to be a good representation of emission rates for metals from residential heaters, so these
pollutants are not included.

For all counties in the United States, the distillate oil consumed by residential combustion is assumed to
be No. 2 fuel oil with a heating value of 140,000 Btu per gallon. The S02 emissions factor for distillate oil
assumes a sulfur content of 500 parts per million (ppm) and is calculated at the county level [ref 8],

Emissions factors for kerosene are based on the emissions factors for distillate oil, which are multiplied
by a factor of 135/140 to convert them for this use. This factor is based on the ratio of the heat content
of kerosene (135,000 Btu/gallon) to the heat content of distillate oil (140,000 Btu/gallon) [ref 4], Criteria
pollutant and HAP emissions factors are from the same sources discussed above for distillate fuel oil.
The distillate sulfur content (500 ppm) is used for kerosene as well [ref 8],

Pollutant emissions factors for residential LPG are based on the residential natural gas emissions factors.
The natural gas emissions factors [ref 9] are converted to LPG emissions factors by multiplying by 96,750
Btu/gallon.

26.3.4	Controls

There are no controls assumed for this category.

26.3.5	Emissions

The criteria pollutant and HAP emissions from residential heating are calculated by multiplying the
distributed county-level residential fuel consumption by the corresponding emissions factor for each
pollutant. The adjusted emissions factors for S02 and PM for anthracite and bituminous/subbituminous
coal are calculated above in equation 6 in Section 4.14.3.3.

Where:

Ef,c,p FCf c X EFf p X

1 ton	(7)

2000 lb

Ef/C/P = annual emissions of pollutant p from combustion of fuel type/in county c, in tons
FC/c = fuel consumption of fuel type/in county c, in tons, thousand barrels, orthousand

cubic feet, from equation 5
EFfiP = emissions factor pollutant p and fuel type/, in pounds of emissions per unit (tons,

thousand barrels, or thousand cubic feet) of fuel consumption, are available in the
Wagon Wheel Emission Factor Compendium.

26-8


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26.3.6 Example calculations

Table 26-7 provides sample calculations for CO emissions from residential heating from distillate fuel oil.
The values in these equations are demonstrating program logic and are not representative of any
specific NEI year or county.

Table 26-7: Sample calculations for CO emissions from residential heating from distillate fuel oil

Eq. #

Equation

Values

Result

1

FCanth./bit,s
~ FCcoal,s * Ranth/bit

N/A

This example
is for
distillate.
Equation 1 is
for coal.

2

Rdfo/ker,s

FCdfo/ker,s

FCdfo,s FCker.s

15,062 thousand barrels

0.9844 ratio
of DFO to
total fuel oil

(15,062 thousand barrels + 238 thousand barrels)

3

HUdfo/ker,c
— HUf0C X Rdfo/ker,s

8,081 houses x 0.9844

7,955.30
houses using
DFO

4

R -HUf'c
f'C HUfiS

7,955.30 houses
916,301.2 houses

0.0086

county

housing

allocation

ratio

5

FCf,c

= FCf,s X Rf c
x 42 gal. per barrel

15,062 thous. barrels x 0.0086 x 42 gal. per barrel

5,492.25
thousand
gallons DFO
consumed

6

EFanth/bit,s,p

— SACj-s X EFunadjj

N/A

This example
is for
distillate.
Equation 6 is
for coal.

7

Ef,C,p

= FCf.c. x EFf.p
1 ton

X 2000 lb

1 ton

5,492.25 thous. gal.x 5 lbs. per thous. gal x

13.7 tons CO
from DFO

26.3.7 Improvements/Changes in the 2020 NEI

There were no changes in methodology from the 2017 NEI. Activity data was updated to reflect the
most recent, best available data at the time of the NEI.

26-9


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26.3.8 Puerto Rico and U.S. Virgin Islands

Since insufficient data exist to calculate emissions for the counties in Puerto Rico and the US Virgin
Islands, emissions are based on two proxy counties in Florida: 12011, Broward County for Puerto Rico
and 12087, Monroe County for the US Virgin Islands. The total emissions in tons for these two Florida
counties are divided by their respective populations creating a tons per capita emissions factor. For
each Puerto Rico and US Virgin Island county, the tons per capita emissions factor is multiplied by the
county population (from the same year as the inventory's activity data) which served as the activity
data. In these cases, the throughput (activity data) unit and the emissions denominator unit are "EACH".

26.4 References

1.	U.S. Department of Energy. Energy Information Administration (EIA). 2022. State Energy Data
System (SEDS): 1960-2020 Consumption.

2.	U.S. Census Bureau. 2022. American Community Survey. B25040 House Heating Fuel. 2020 ACS
5-Year Estimates.

3.	U.S. Department of Energy, Energy Information Administration. 2018. "Domestic Distribution of
U.S. Coal by Destination State, Consumer, Origin and Method of Transportation".

4.	U.S. Environmental Protection Agency. 1996. Compilation of Air Pollutant Emission Factors, 5th
Edition, AP-42, Volume 1: Stationary Point and Area Sources. Research Triangle Park, North
Carolina.

5.	U.S. Environmental Protection Agency. 2004. Emission Inventory Improvement Program.
Estimating Ammonia Emissions from Anthropogenic Sources, Draft Final Report. Prepared by
E.H. Pechan and Associates, Inc. Research Triangle Park, NC.

6.	Porter, Fred, U.S. Environmental Protection Agency, Emission Standards Division. Note to Anne
Pope, U.S. Environmental Protection Agency/Emissions Monitoring and Analysis Division.
Comments on Industrial Boiler information in the "Baseline Emission Inventory of HAP Emissions
from MACT Sources - Interim Final Report," September 18, 1998. November 13, 1998.

7.	U.S. Department of Energy, Energy Information Administration. 2017. Coal Data Browser.

8.	U.S. Environmental Protection Agency. 2016. Technical Support Document (TSD) Preparation of
Emissions Inventories for the Version 6.3, 2011 Emissions Modeling Platform. Prepared by U.S.
Environmental Protection Agency Office of Air and Radiation Office of Air Quality Planning and
Standards Air Quality Assessment Division.

9.	Huntley, Roy. 2012. Spreadsheet:

"natgas procgas Ipg pm efs not ap42 032012 revisions.xls"

26-10


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United States	Office of Air Quality Planning and Standards	Publication No. EPA-454/R-23-001z

Environmental Protection	Air Quality Assessment Division	March 2023

Agency	Research Triangle Park, NC


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