Last Modified: 4 April 2014

Red text indicates an update from the 2011 version of this document.

Gas 100-year GWP

CH4 25

N2O 298

Table 1 Stationary Combustion Emission Factors

Fuel Type Heating Value CO2 Factor CH4 Factor N2O Factor CO2 Factor CH4 Factor N2O Factor Unit

mmBtu per short 

ton

kg CO2 per 

mmBtu

g CH4 per mmBtu g N2O per mmBtu kg CO2 per short 

ton

g CH4 per short 

ton

g N2O per short 

ton

Coal and Coke

Anthracite Coal 25.09 103.69 11 1.6 2,602 276 40 short tons

Bituminous Coal 24.93 93.28 11 1.6 2,325 274 40 short tons

Sub-bituminous Coal 17.25 97.17 11 1.6 1,676 190 28 short tons

Lignite Coal 14.21 97.72 11 1.6 1,389 156 23 short tons

Mixed (Commercial Sector) 21.39 94.27 11 1.6 2,016 235 34 short tons

Mixed (Electric Power Sector) 19.73 95.52 11 1.6 1,885 217 32 short tons

Mixed (Industrial Coking) 26.28 93.90 11 1.6 2,468 289 42 short tons

Mixed (Industrial Sector) 22.35 94.67 11 1.6 2,116 246 36 short tons

Coal Coke 24.80 113.67 11 1.6 2,819 273 40 short tons

Fossil Fuel-derived Fuels (Solid)

Municipal Solid Waste 9.95 90.70 32 4.2 902 318 42 short tons

Petroleum Coke (Solid) 30.00 102.41 32 4.2 3,072 960 126 short tons

Plastics 38.00 75.00 32 4.2 2,850 1,216 160 short tons

Tires 28.00 85.97 32 4.2 2,407 896 118 short tons

Biomass Fuels (Solid)

Agricultural Byproducts 8.25 118.17 32 4.2 975 264 35 short tons

Peat 8.00 111.84 32 4.2 895 256 34 short tons

Solid Byproducts 10.39 105.51 32 4.2 1,096 332 44 short tons

Wood and Wood Residuals 17.48 93.80 7.2 3.6 1,640 126 63 short tons

mmBtu per scf kg CO2 per 

mmBtu

g CH4 per mmBtu g N2O per mmBtu kg CO2 per scf g CH4 per scf g N2O per scf

Natural Gas

Natural Gas (per scf) 0.001026 53.06 1.0 0.10 0.05444 0.00103 0.00010 scf

Fossil-derived Fuels (Gaseous)

Blast Furnace Gas 0.000092 274.32 0.022 0.10 0.02524 0.000002 0.000009 scf

Coke Oven Gas 0.000599 46.85 0.48 0.10 0.02806 0.000288 0.000060 scf

Fuel Gas 0.001388 59.00 3.0 0.60 0.08189 0.004164 0.000833 scf

Propane Gas 0.002516 61.46 0.022 0.10 0.15463 0.000055 0.000252 scf

Biomass Fuels (Gaseous)

Landfill Gas 0.000485 52.07 3.2 0.63 0.025254 0.001552 0.000306 scf

Other Biomass Gases 0.000655 52.07 3.2 0.63 0.034106 0.002096 0.000413 scf

mmBtu per gallon kg CO2 per 

mmBtu

g CH4 per mmBtu g N2O per mmBtu kg CO2 per gallon g CH4 per gallon g N2O per gallon

Petroleum Products

Asphalt and Road Oil 0.158 75.36 3.0 0.60 11.91 0.47 0.09 gallon

Aviation Gasoline 0.120 69.25 3.0 0.60 8.31 0.36 0.07 gallon

Butane 0.103 64.77 3.0 0.60 6.67 0.31 0.06 gallon

Butylene 0.105 68.72 3.0 0.60 7.22 0.32 0.06 gallon

Crude Oil 0.138 74.54 3.0 0.60 10.29 0.41 0.08 gallon

Distillate Fuel Oil No. 1 0.139 73.25 3.0 0.60 10.18 0.42 0.08 gallon

Distillate Fuel Oil No. 2 0.138 73.96 3.0 0.60 10.21 0.41 0.08 gallon

Distillate Fuel Oil No. 4 0.146 75.04 3.0 0.60 10.96 0.44 0.09 gallon

Ethane 0.068 59.60 3.0 0.60 4.05 0.20 0.04 gallon

Ethylene 0.058 65.96 3.0 0.60 3.83 0.17 0.03 gallon

Heavy Gas Oils 0.148 74.92 3.0 0.60 11.09 0.44 0.09 gallon

Isobutane 0.099 64.94 3.0 0.60 6.43 0.30 0.06 gallon

Isobutylene 0.103 68.86 3.0 0.60 7.09 0.31 0.06 gallon

Kerosene 0.135 75.20 3.0 0.60 10.15 0.41 0.08 gallon

Kerosene-type Jet Fuel 0.135 72.22 3.0 0.60 9.75 0.41 0.08 gallon

Liquefied Petroleum Gases (LPG) 0.092 61.71 3.0 0.60 5.68 0.28 0.06 gallon

Lubricants 0.144 74.27 3.0 0.60 10.69 0.43 0.09 gallon

Motor Gasoline 0.125 70.22 3.0 0.60 8.78 0.38 0.08 gallon

Naphtha (<401 deg F) 0.125 68.02 3.0 0.60 8.50 0.38 0.08 gallon

Natural Gasoline 0.110 66.88 3.0 0.60 7.36 0.33 0.07 gallon

Other Oil (>401 deg F) 0.139 76.22 3.0 0.60 10.59 0.42 0.08 gallon

Pentanes Plus 0.110 70.02 3.0 0.60 7.70 0.33 0.07 gallon

Petrochemical Feedstocks 0.125 71.02 3.0 0.60 8.88 0.38 0.08 gallon

Petroleum Coke 0.143 102.41 3.0 0.60 14.64 0.43 0.09 gallon

Propane 0.091 62.87 3.0 0.60 5.72 0.27 0.05 gallon

Propylene 0.091 65.95 3.0 0.60 6.00 0.27 0.05 gallon

Residual Fuel Oil No. 5 0.140 72.93 3.0 0.60 10.21 0.42 0.08 gallon

Residual Fuel Oil No. 6 0.150 75.10 3.0 0.60 11.27 0.45 0.09 gallon

Special Naphtha 0.125 72.34 3.0 0.60 9.04 0.38 0.08 gallon

Still Gas 0.143 66.72 3.0 0.60 9.54 0.43 0.09 gallon

Unfinished Oils 0.139 74.54 3.0 0.60 10.36 0.42 0.08 gallon

Used Oil 0.138 74.00 3.0 0.60 10.21 0.41 0.08 gallon

Biomass Fuels (Liquid)

Biodiesel (100%) 0.128 73.84 1.1 0.11 9.45 0.14 0.01 gallon

Ethanol (100%) 0.084 68.44 1.1 0.11 5.75 0.09 0.01 gallon

Rendered Animal Fat 0.125 71.06 1.1 0.11 8.88 0.14 0.01 gallon

Vegetable Oil 0.120 81.55 1.1 0.11 9.79 0.13 0.01 gallon

mmBtu per gallon kg CO2 per 

mmBtu

g CH4 per mmBtu g N2O per mmBtu

Steam and Hot Water

Steam and Hot Water 66.33 1.250 0.125 mmBtu

Source:

http://www.epa.gov/ghgreporting/documents/pdf/2013/documents/memo-2013-technical-revisions.pdf

http://www.epa.gov/ghgreporting/reporters/subpart/c.html

Emission Factors for Greenhouse Gas Inventories

Typically, greenhouse gas emissions are reported in units of carbon dioxide equivalent (CO2e). Gases are converted to CO2e by multiplying by their global warming potential (GWP). The emission factors 

listed in this document have not been converted to CO2e. To do so, multiply the emissions by the corresponding GWP listed in the table below. 

Steam and Hot Water: EPA (2008) Climate Leaders Greenhouse Gas Inventory Protocol Core Module Guidance - Indirect Emissions from Purchases/Sales of Electricity and Steam . Assumption: 80% boiler efficiency 

and fuel type assumed natural gas. Factors are per mmBtu of steam or hot water purchased. 

Source: Intergovernmental Panel on Climate Change (IPCC), Fourth Assessment

Report (AR4), 2007. See the source note to Table 9 for further explanation. 

Solid, gaseous, liquid and biomass fuels: Federal Register (2009) EPA; 40 CFR Parts 86, 87, 89 et al; Mandatory Reporting of Greenhouse Gases; Final Rule , 30Oct09, 261 pp. Tables C-1 and C-2 at FR pp. 56409-

56410. Revised emission factors for selected fuels: Federal Register (2010) EPA; 40 CFR Part 98; Mandatory Reporting of Greenhouse Gases; Final Rule, 17Dec10, 81 pp. With Amendments from Memo: Table of Final 

2013 Revisions to the Greenhouse Gas Reporting Rule (PDF) to 40 CFR part 98, subpart C: Table C–1 to Subpart C—Default CO2 Emission Factors and High Heat Values for Various Types of Fuel and Table C–2 to 

Subpart C—Default CH4 and N2O Emission Factors for Various Types of Fuel. 
Red text indicates an update 

from the 2011 version of this document.

Emission Factors for Greenhouse Gas Inventories

Last Modified: 4 April 2014 

Page 2 of 5

Table 2 Mobile Combustion CO2 Emission Factors

Fuel Type kg CO2 per unit Unit

Aviation Gasoline 8.31 gallon

Biodiesel (100%) 9.45 gallon

Compressed Natural Gas (CNG) 0.0545 scf

Diesel Fuel 10.21 gallon

Ethane 4.05 gallon

Ethanol (100%) 5.75 gallon

Jet Fuel (kerosene type) 9.75 gallon

Liquefied Natural Gas (LNG) 4.46 gallon

Liquefied Petroleum Gases (LPG) 5.68 gallon

Methanol 4.10 gallon

Motor Gasoline 8.78 gallon

Propane 5.72 gallon

Residual Fuel Oil 11.27 gallon

Source:

LNG sourced from: EPA (2008) Climate Leaders Greenhouse Gas Inventory Protocol Core Module Guidance - Direct Emissions from Mobile Combustion Sources, Table B-5.

Table 3 Mobile Combustion CH4 and N2O Emission Factors for On-road Gasoline Vehicles

Vehicle Type Year CH4 Factor 

(g / mile)

N2O Factor 

(g / mile)

Gasoline Passenger Cars 1973-74 0.1696 0.0197

1975 0.1423 0.0443

1976-77 0.1406 0.0458

1978-79 0.1389 0.0473

1980 0.1326 0.0499

1981 0.0802 0.0626

1982 0.0795 0.0627

1983 0.0782 0.0630

1984-93 0.0704 0.0647

1994 0.0531 0.0560

1995 0.0358 0.0473

1996 0.0272 0.0426

1997 0.0268 0.0422

1998 0.0249 0.0393

1999 0.0216 0.0337

2000 0.0178 0.0273

2001 0.0110 0.0158

2002 0.0107 0.0153

2003 0.0114 0.0135

2004 0.0145 0.0083

2005 0.0147 0.0079

2006 0.0161 0.0057

2007 0.0170 0.0041

2008 0.0172 0.0038

2009-present 0.0173 0.0036

Gasoline Light-duty Trucks 1973-74 0.1908 0.0218

(Vans, Pickup Trucks, SUVs) 1975 0.1634 0.0513

1976 0.1594 0.0555

1977-78 0.1614 0.0534

1979-80 0.1594 0.0555

1981 0.1479 0.0660

1982 0.1442 0.0681

1983 0.1368 0.0722

1984 0.1294 0.0764

1985 0.1220 0.0806

1986 0.1146 0.0848

1987-93 0.0813 0.1035

1994 0.0646 0.0982

1995 0.0517 0.0908

1996 0.0452 0.0871

1997 0.0452 0.0871

1998 0.0391 0.0728

1999 0.0321 0.0564

2000 0.0346 0.0621

2001 0.0151 0.0164

2002 0.0178 0.0228

2003 0.0155 0.0114

2004 0.0152 0.0132

2005 0.0157 0.0101

2006 0.0159 0.0089

2007 0.0161 0.0079

2008-present 0.0163 0.0066

Gasoline Heavy-duty Vehicles <1981 0.4604 0.0497

1982-84 0.4492 0.0538

1985-86 0.4090 0.0515

1987 0.3675 0.0849

1988-1989 0.3492 0.0933

1990-1995 0.3246 0.1142

1996 0.1278 0.1680

1997 0.0924 0.1726

1998 0.0641 0.1693

1999 0.0578 0.1435

2000 0.0493 0.1092

2001 0.0528 0.1235

2002 0.0546 0.1307

2003 0.0533 0.1240

2004 0.0341 0.0285

2005 0.0326 0.0177

2006 0.0327 0.0171

2007 0.0330 0.0153

2008-present 0.0333 0.0134

Source: EPA (2014) Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2012. All values are calculated from Tables A-101 through A-105.

Federal Register (2009) EPA; 40 CFR Parts 86, 87, 89 et al; Mandatory Reporting of Greenhouse Gases; Final Rule , 30Oct09, 261 pp. Tables C-1 and C-2. Table of Final 2013 Revisions to the Greenhouse Gas 

Methanol sourced from: The Climate Registry (2013); General Reporting Protocol for the Voluntary Reporting Program Version 2.0 , Default Emission Factors, Table 13.1 US Default CO2 Emission Factors for Transport 

Fuels.
Red text indicates an update 

from the 2011 version of this document.

Emission Factors for Greenhouse Gas Inventories

Last Modified: 4 April 2014 

Page 3 of 5

Table 4 Mobile Combustion CH4 and N2O Emission Factors for On-road Diesel and Alternative Fuel Vehicles

Vehicle Type Vehicle Year CH4 Factor 

(g / mile)

N2O Factor 

(g / mile)

1960-1982 0.0006 0.0012

1983-1995 0.0005 0.0010

1996-present 0.0005 0.0010

1960-1982 0.0011 0.0017

1983-1995 0.0009 0.0014

1996-present 0.0010 0.0015

Diesel Medium- and Heavy-duty Vehicles 1960-present 0.0051 0.0048

1960-1995 0.0899 0.0087

1996-present 0.0672 0.0069

CNG Light-duty Vehicles 0.7370 0.0500

CNG Heavy-duty Vehicles 1.9660 0.1750

CNG Buses 1.9660 0.1750

LPG Light-duty Vehicles 0.0370 0.0670

LPG Heavy-duty Vehicles 0.0660 0.1750

LNG Heavy-duty Vehicles 1.9660 0.1750

Ethanol Light-duty Vehicles 0.0550 0.0670

Ethanol Heavy-duty Vehicles 0.1970 0.1750

Ethanol Buses 0.1970 0.1750

Source: EPA (2014) Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2012. All values are calculated from Tables A-104 through A-106.

Table 5 Mobile Combustion CH4 and N2O Emission Factors for Non-road Vehicles

Vehicle Type CH4 Factor 

(g / gallon) 

N2O Factor 

(g / gallon) 

LPG Non-Highway Vehicles 0.50 0.22

Residual Oil Ships and Boats 0.11 0.57

Diesel Ships and Boats 0.06 0.45

Gasoline Ships and Boats 0.64 0.22

Diesel Locomotives 0.80 0.26

Gasoline Agricultural Equip. 1.26 0.22

Diesel Agricultural Equip. 1.44 0.26

Gasoline Construction Equip. 0.50 0.22

Diesel Construction Equip. 0.57 0.26

Jet Fuel Aircraft 0.00 0.30

Aviation Gasoline Aircraft 7.06 0.11

Biodiesel Vehicles 0.57 0.26

Other Diesel Sources 0.57 0.26

Other Gasoline Sources 0.50 0.22

Source: EPA (2014) Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2012. All values are calculated from Table A-107.

Note: LPG non-highway vehicles assumed equal to other gasoline sources. Biodiesel vehicles assumed equal to other diesel sources.

Table 6 Electricity Emission Factors

eGRID Subregion CO2 Factor CH4 Factor N2O Factor CO2 Factor CH4 Factor N2O Factor

(lb CO2 /MWh) (lb CH4 /MWh) (lb N2O /MWh) (lb CO2/MWh) (lb CH4/MWh) (lb N2O/MWh)

AKGD (ASCC Alaska Grid) 1,256.87 0.02608 0.00718 1,387.37 0.03405 0.00693

AKMS (ASCC Miscellaneous) 448.57 0.01874 0.00368 1,427.76 0.05997 0.01180

AZNM (WECC Southwest) 1,177.61 0.01921 0.01572 1,210.44 0.02188 0.00986

CAMX (WECC California) 610.82 0.02849 0.00603 932.82 0.03591 0.00455

ERCT (ERCOT All) 1,218.17 0.01685 0.01407 1,181.70 0.02012 0.00763

FRCC (FRCC All) 1,196.71 0.03891 0.01375 1,277.42 0.03873 0.01083

HIMS (HICC Miscellaneous) 1,330.16 0.07398 0.01388 1,690.72 0.10405 0.01912

HIOA (HICC Oahu) 1,621.86 0.09930 0.02241 1,588.23 0.11948 0.02010

MROE (MRO East) 1,610.80 0.02429 0.02752 1,755.66 0.03153 0.02799

MROW (MRO West) 1,536.36 0.02853 0.02629 2,054.55 0.05986 0.03553

NEWE (NPCC New England) 722.07 0.07176 0.01298 1,106.82 0.06155 0.01207

NWPP (WECC Northwest) 842.58 0.01605 0.01307 1,340.34 0.04138 0.01784

NYCW (NPCC NYC/Westchester) 622.42 0.02381 0.00280 1,131.63 0.02358 0.00244

NYLI (NPCC Long Island) 1,336.11 0.08149 0.01028 1,445.94 0.03403 0.00391

NYUP (NPCC Upstate NY) 545.79 0.01630 0.00724 1,253.77 0.03683 0.01367

RFCE (RFC East) 1,001.72 0.02707 0.01533 1,562.72 0.03593 0.02002

RFCM (RFC Michigan) 1,629.38 0.03046 0.02684 1,744.52 0.03231 0.02600

RFCW (RFC West) 1,503.47 0.01820 0.02475 1,982.87 0.02450 0.03107

RMPA (WECC Rockies) 1,896.74 0.02266 0.02921 1,808.03 0.02456 0.02289

SPNO (SPP North) 1,799.45 0.02081 0.02862 1,951.83 0.02515 0.02690

SPSO (SPP South) 1,580.60 0.02320 0.02085 1,436.29 0.02794 0.01210

SRMV (SERC Mississippi Valley) 1,029.82 0.02066 0.01076 1,222.40 0.02771 0.00663

SRMW (SERC Midwest) 1,810.83 0.02048 0.02957 1,964.98 0.02393 0.02965

SRSO (SERC South) 1,354.09 0.02282 0.02089 1,574.37 0.02652 0.02149

SRTV (SERC Tennessee Valley) 1,389.20 0.01770 0.02241 1,873.83 0.02499 0.02888

SRVC (SERC Virginia/Carolina) 1,073.65 0.02169 0.01764 1,624.71 0.03642 0.02306

US Average 1,232.35 0.02414 0.01826 1,520.20 0.03127 0.01834

Total output emission factors Non-baseload emission factors

Source: EPA Year 2010 eGRID 9th edition Version 1.0 February 2014.

Note: Total output emission factors are used for quantifying emissions from purchased electricity. Non-baseload emission factors are used for quantifying the emission 

reductions from purchased green power. 

This is a representational map; many of the boundaries shown on this map are approximate because they are based on companies,

not on strictly geographical boundaries. 

Source: EPA Year 2010 eGRID 9th edition Version 1.0 February 2014.

Diesel Passenger Cars

Diesel Light-duty Trucks

Gasoline Motorcycles
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from the 2011 version of this document.

Emission Factors for Greenhouse Gas Inventories

Last Modified: 4 April 2014 

Page 4 of 5

Table 7 Business Travel Emission Factors

Vehicle Type CO2 Factor 

(kg / unit)

CH4 Factor 

(g / unit)

N2O Factor 

(g / unit)

Units

Passenger Car A 0.368 0.018 0.013 vehicle-mile

Light-duty Truck B 0.501 0.024 0.019 vehicle-mile

Motorcycle 0.197 0.070 0.007 vehicle-mile

Intercity Rail (i.e. Amtrak) C 0.144 0.0085 0.0032 passenger-mile

Commuter Rail D 0.174 0.0084 0.0035 passenger-mile

Transit Rail (i.e. Subway, Tram) E 0.133 0.0026 0.0020 passenger-mile

Bus 0.058 0.0007 0.0004 passenger-mile

Air Travel - Short Haul (< 300 miles) 0.275 0.0091 0.0087 passenger-mile

Air Travel - Medium Haul (>= 300 miles, 

< 2300 miles) 0.162 0.0008 0.0052 passenger-mile

Air Travel - Long Haul (>= 2300 miles) 0.191 0.0008 0.0060 passenger-mile

Table 8 Product Transport Emission Factors

Vehicle Type CO2 Factor 

(kg / unit)

CH4 Factor 

(g / unit)

N2O Factor 

(g / unit) Units

Medium- and Heavy-duty Truck 1.456 0.018 0.011 vehicle-mile

Passenger Car A 0.368 0.018 0.013 vehicle-mile

Light-duty Truck B 0.501 0.024 0.019 vehicle-mile

Medium- and Heavy-duty Truck 0.296 0.0036 0.0022 ton-mile

Rail 0.026 0.0020 0.0007 ton-mile

Waterborne Craft 0.042 0.0004 0.0027 ton-mile

Aircraft 1.301 0.0000 0.0400 ton-mile

Source: 

CO2, CH4, and N2O emissions data for highway vehicles are from Table 2-15 of the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. Vehicle-miles and passenger-miles data for highway vehicles are from Table VM-1 of 

the Federal Highway Administration Highway Statistics 2012.

Fuel consumption data and passenger-miles data for rail are from Tables A.14 to A.16 and 9.10 to 9.12 of the Transportation Energy Data Book: Edition 32. Fuel consumption was converted to emissions by using fuel and electricity emission 

factors presented in the tables above. 

Notes: 

A Passenger car: includes passenger cars, minivans, SUVs, and small pickup trucks (vehicles with wheelbase less than 121 inches). 

B

 Light-duty truck: includes full-size pickup trucks, full-size vans, and extended-length SUVs (vehicles with wheelbase greater than 121 inches). 

C Intercity rail: long-distance rail between major cities, such as Amtrak

D

 Commuter rail: rail service between a central city and adjacent suburbs (also called regional rail or suburban rail)

E

 Transit rail: rail typically within an urban center, such as subways, elevated railways, metropolitan railways (metro), streetcars, trolley cars, and tramways. 

Source: 

CO2, CH4, and N2O emissions data for highway vehicles are from Table 2-15 of the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. Vehicle-miles and passenger-miles data for highway vehicles are from Table VM-1 of 

the Federal Highway Administration Highway Statistics 2012. 

CO2e emissions data for non-highway vehicles are based on Table A-116 of the U.S. Greenhouse Gas Emissions and Sinks: 1990–2012, which are distributed into CO2, CH4, and N2O emissions based on fuel/vehicle emission factors. 

Freight ton-mile data for non-highway vehicles are from Table 1-50 of the Bureau of Transportation Statistics, National Transportation Statistics for 2012.

Notes: 

Vehicle-mile factors are appropriate to use when the entire vehicle is dedicated to transporting the reporting company's product. Ton-mile factors are appropriate when the vehicle is shared with products from other companies. 

A Passenger car: includes passenger cars, minivans, SUVs, and small pickup trucks (vehicles with wheelbase less than 121 inches). 

B

 Light-duty truck: includes full-size pickup trucks, full-size vans, and extended-length SUVs (vehicles with wheelbase greater than 121 inches). 
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Emission Factors for Greenhouse Gas Inventories

Last Modified: 4 April 2014 

Page 5 of 5

Table 9 Global Warming Potentials (GWPs)

Gas 100-year GWP

CO2 1

CH4 25

N2O 298

HFC-23 14,800

HFC-32 675

HFC-41 92

HFC-125 3,500

HFC-134 1,100

HFC-134a 1,430

HFC-143 353

HFC-143a 4,470

HFC-152 53

HFC-152a 124

HFC-161 12

HFC-227ea 3,220

HFC-236cb 1,340

HFC-236ea 1,370

HFC-236fa 9,810

HFC-245ca 693

HFC-245fa 1,030

HFC-365mfc 794

HFC-43-10mee 1,640

SF6 22,800

NF3 17,200

CF4 7,390

C2F6 12,200

C3F8 8,830

c-C4F8 10,300

C4F10 8,860

C5F12 9,160

C6F14 9,300

C10F18 >7,500

Table 9b GWPs for Blended Refrigerants

ASHRAE # 100-year GWP

R-401A 16

R-401B 14

R-401C 19

R-402A 2,100

R-402B 1,330

R-403B 3,444

R-404A 3,922

R-406A 0

R-407A 2,107

R-407B 2,804

R-407C 1,774

R-407D 1,627

R-407E 1,552

R-408A 2,301

R-409A 0

R-410A 2,088

R-410B 2,229

R-411A 14

R-411B 4

R-413A 2,053

R-414A 0

R-414B 0

R-417A 2,346

R-422A 3,143

R-422D 2,729

R-423A 2,280

R-424A 2,440

R-426A 1,508

R-428A 3,607

R-434A 3,245

R-500 32

R-502 0

R-504 325

R-507 3,985

R-508A 13,214

R-508B 13,396

Source: 

100-year GWPs from IPCC Fourth Assessment Report (AR4), 2007. See the source note to Table 9 for further explanation. GWPs of blended refrigerants are based on their HFC and PFC constituents, which are based 

on data from http://www.epa.gov/ozone/snap/refrigerants/refblend.html.

44% HFC-125 , 4% HFC-134a , 52% HFC 143a

55% HCFC-22 , 41% HCFC-142b , 4% isobutane

20% HFC-32 , 40% HFC-125 , 40% HFC-134a

53% HCFC-22 , 34% HCFC-124 , 13% HFC-152a

61% HCFC-22 , 28% HCFC-124 , 11% HFC-152a

33% HCFC-22 , 52% HCFC-124 , 15% HFC-152a

38% HCFC-22 , 6% HFC-125 , 2% propane

6% HCFC-22 , 38% HFC-125 , 2% propane

56% HCFC-22 , 39% PFC-218 , 5% propane

10% HFC-32 , 70% HFC-125 , 20% HFC-134a

5% HFC-125 , 5% HFC143a

39% HFC-23 , 61% PFC-116

46% HFC-23 , 54% PFC-116

48.8% HCFC-22 , 51.2% CFC-115 

48.2% HFC-32 , 51.8% CFC-115

73.8% CFC-12 , 26.2% HFC-152a , 48.8% HCFC-22

47.5% HFC-227ea , 52.5% HFC-134a , 

50.5% HFC-125, 47% HFC-134a, 2.5% butane/pentane

51% HCFC-22 , 28.5% HCFC-124 , 16.5% HCFC-142b

5% HCFC-22 , 39% HCFC-124 , 9.5% HCFC-142b

46.6% HFC-125 , 5% HFC-134a , 3.4% butane

85.1% HFC-125 , 11.5% HFC-134a , 3.4% isobutane

65.1% HFC-125 , 31.5% HFC-134a , 3.4% isobutane

Source: 

100-year GWPs from IPCC Fourth Assessment Report (AR4), 2007. IPCC AR4 was published in 2007 and is among the most current and comprehensive peer-reviewed assessments of climate change. AR4 provides revised GWPs of 

several GHGs relative to the values provided in previous assessment reports, following advances in scientific knowledge on the radiative efficiencies and atmospheric lifetimes of these GHGs and of CO2. Because the GWPs provided in AR4 

reflect an improved scientific understanding of the radiative effects of these gases in the atmosphere, the values provided are more appropriate for supporting the overall goal of organizational GHG reporting than the Second Assessment 

Report (SAR) GWP values previously used in the Emission Factors Hub. 

While EPA recognizes that Fifth Assessment Report (AR5) GWPs have been published, in an effort to ensure consistency and comparability of GHG data between EPA’s voluntary and non-voluntary GHG reporting programs (e.g. GHG 

Reporting Program and National Inventory), EPA recommends the use of AR4 GWPs. The United States and other developed countries to the UNFCCC have agreed to submit annual inventories in 2015 and future years to the UNFCCC 

using GWP values from AR4, which will replace the current use of SAR GWP values. Utilizing AR4 GWPs improves EPA’s ability to analyze corporate, national, and sub-national GHG data consistently, enhances communication of GHG 

information between programs, and gives outside stakeholders a consistent, predictable set of GWPs to avoid confusion and additional burden.

Blend Composition

5.1% HFC-125, 93% HFC-134a, 1.9% butane/pentane

77.5% HFC-125 , 2% HFC-143a , 1.9% isobutane

63.2% HFC-125, 16% HFC-134a, 18% HFC-143a, 2.8% isobutane

50% HFC-32 , 50% HFC-125

45% HFC-32 , 55% HFC-125 

87.5% HCFC-22 , 11 HFC-152a , 1.5% propylene

94% HCFC-22 , 3% HFC-152a , 3% propylene

88% HFC-134a , 9% PFC-218 , 3% isobutane

23% HFC-32 , 25% HFC-125 , 52% HFC-134a

15% HFC-32 , 15% HFC-125 , 70% HFC-134a

25% HFC-32 , 15% HFC-125 , 60% HFC-134a

47% HCFC-22 , 7% HFC-125 , 46% HFC 143a

60% HCFC-22 , 25% HCFC-124 , 15% HCFC-142b