SIMAP emission factors: 2021 version
Comprehensive list of references used to calculate SIMAP emission factors, organized by reference
Updated January 2022
US GHG Inventory Annexes/Annex tables (Most widely used source in SIMAP emission factors):
https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks-1990-2019
- Table A-40: C Content Coefficients, used for many fuels (stationary and mobile).
- Table A-41: Annually Variable C Content Coefficients.
- Table A-42: Key Assumptions fpr Estimating CO2 Emissions
- Table A-43: Annually Variable C Content Coefficients by Year
- Table A-91: CH4 and N2O Emission Factors by Fuel Type and Sector.
- Table A-93: Energy Consumption by Fuel and Vehicle Type. Used in the CH4 and N2O per Gallon Calculations.
- Table A-95: Vehicle Miles Traveled for Gasoline On-Road Vehicles. Used in the CH4 and N2O per Gallon Calculations.
- Table A-96: Vehicle Miles Traveled for Diesel On-Road Vehicles. Used in the CH4 and N2O per Gallon Calculations.
- Table A-99: Detailed Vehicle Miles Traveled for Alternative Fuel On-Road Vehicles. Used in the CH4 and N2O per Gallon Calculations.
- Table A-99: Age Distribution by Vehicle/Fuel Type for On-Road Vehicles, 2014. Used in the CH4 and N2O per Gallon Calculations.
- Table A-101: VMT Distribution by Vehicle Age and Vehicle/Fuel Type, 2014. Used in the CH4 and N2O per Gallon Calculations.
- Table A-115: Emission Factors for CH4 Emissions from Non-Road Mobile Combustion. Used for Jet fuel.
- Table A-177: Annex I Countries’ Implied Emission Factors for Cattle by Year. Used for Cattle EFs.
- Table A-178: CH4 Emissions from Cattle.
- Table A-179: Emission Factors for Other Livestock.
- Table A-181: CH4 Emissions from Enteric Fermentation. Used for Cattle EFs.
- Table A-184: Livestock Population.
- Table A-195: Total Methane Emissions from Livestock Manure Management.
- Table A-196: Total (Direct and Indirect) Nitrous Oxide Emissions from Livestock Manure Management.
- This source is also used for wasteater CH4 and N2O emission factors
Bureau of Transportation Statistics Tables:
https://www.bts.gov/topics/national-transportation-statistics
- Table 1-11: Number of U.S. Aircraft, Vehicles, Vessels, and Other Conveyances. Used in the MPG calculations.
- Table 4-11: Light Duty Vehicle, Short Wheel Base and Motorcycle Fuel Consumption and Travel. Used in the MPG calculations and the CH4 and N2O per gallon calculations.
- Table 4-15: Bus Fuel Consumption and Travel. Used in the MPG calculations.
- Table 4-20: Energy Intensity of Passenger Modes (Btu per passenger-mile). Used in the EF Mobile Calculations.
- Table 4-24: Energy Intensity of Transit Motor Buses. Used in the MPG calculations.
American Public Transportation Fact Book (APTA) Tables and Annex Tables:
- Table 1: National Totals for selected Modes. Used in the MPG calculations.
- Table 3: Passenger Miles by Mode (A and B). Used in the MPG calculations.
- Table 9.11: Summary Statistics for Commuter Rail Operations, 1984–2016. Used in the MPG calculations.
- Table 9.12: Summary Statistics for Rail Transit Operations, 1970–2016. Used in the MPG calculations.
- Table A.14: Commuter Rail Fuel Use. Used in the MPG calculations.
- Table A.15: Transit Rail Fuel Use: Used in the MPG calculations.
EPA Motor Vehicle Emission Simulator (MOVES):
https://www.epa.gov/moves/latest-version-motor-vehicle-emission-simulator-moves
- Used in the CH4 and N2O per gallon calculations
2006 IPCC Guidelines for National GHG inventories:
https://www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/4_Volume4/V4_11_Ch11_N2O&CO2.pdf
- Volume 4 Chapter 11 - N2O EMISSIONS FROM MANAGED SOILS, AND CO2 EMISSIONS FROM LIME AND UREA APPLICATION. Used in Fertilizer Calculations.
- Equation 11.1
- Equation 11.9
- Equation 11.10
US Energy Information Administration (EIA) Monthly Energy Review (MER):
https://www.eia.gov/totalenergy/data/monthly/
- Table A1: Approximate Heat Content of Petroleum and Other liquids. Used in the GHG Stationary Combustion Calculations and the EF Mobile Calculations.
- Table A2: Approximate Heat Content of Petroleum Production, Imports, and Exports. Used in the GHG Stationary Combustion Calculations.
- Table A3: Approximate Heat Content of Petroleum Consumption and Fuel Ethanol. Used in the GHG Stationary Combustion Calculations.
- Table A4: Approximate Heat Content of Natural Gas. Used in the GHG Stationary Combustion Calculations.
- Table A5: Approximate Heat Content of Coal and Coke Coal. Used in the GHG Stationary Combustion Calculations.
The Climate Registry 2020 Default Emission Factor Document:
https://theclimateregistry.org/wp-content/uploads/2022/11/2022-Default-Emission-Factors-Final.pdf
- Table 1.1: Default Factors for Calculating CO2 Emissions from Combustion of Fossil Fuel and Biomass. Used for Biomass CO2 emissions.
US EPA Documentation for Greenhouse Gas Emission and Energy Factors Used in the Waste Reduction Model (WARM) – Management Practices Chapters:
- Exhibit 5-1: Gross GHG Emissions from MSW Combustion. Used in the GHG Stationary Combustion Calculations.
EPA Emissions & Generation Resource Integrated Database (eGRID)
https://www.epa.gov/energy/emissions-generation-resource-integrated-database-egrid
- Data file, SRL tab by eGrid subregion. Emission factors in terms of ‘total output emission rate (lb/MWh)’ used to calculate purchased electricity emission factors for scope 2 location-based method.
2021 Green-e Residual Mix Emissions Rates (2019 Data)
https://www.green-e.org/2021-residual-mix
- Residual mix rate emission factors used to calculate purchased electricity emission factors for scope 2 market-based method.
EPA Waste Reduction Model (WARM)
- Landfill emissions factors/sinks for CH4 and CO2; solid waste combustion for N2O;
Solid Waste Management and Greenhouse Gases: A Life-Cycle Assessment of Emissions and Sinks
https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=60000AVO.TXT
- CO2e sink for compost
Food reference details: