Carbon References: Scope 1: Transport Fuels

This table contains reference materials for CO2.  Please, follow the link to see references for CH4 and for N2O.

Carbon References: Scope 1: Transport Fuels: CO2
CO2 Name Emissions factor Base Calculation Source URL Calculations (Separated) Full Calculations Notes
Direct transportation services Gasoline Fleet kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / gallon = (kg CO2 / MMBtu) x (MMBtu / gallon) Weighted average of gasoline passenger cars (96.5%) and gasoline light duty trucks (4.5%). 
Diesel Fleet kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / gallon = (kg CO2 / MMBtu) x (MMBtu / gallon) Summed NOx emissions and fuel consumption for the following types of diesel: Passenger cars, light-duty trucks, buses, medium- and heavy-duty trucks. The resulting emissions factor was a weighted by fuel consumption and emissions. 
Natural Gas Fleet kg CO2 / MMBtu  

[1] GREET 1.5 - Transportation Fuel-Cycle Model. Volume 2: Appendices of Data and Results. Table BI-1 (NOx emission factors).

[2] U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-94 (energy consumption) and Table A-99 (vehicle miles traveled for alternative fuel vehicles).

https://www.anl.gov/energy-systems/publication/greet-15-transportation-f..., https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...

  kg CO2 / MMBtu = (Tg C / Qbtu) * (% Oxidized) * (MT CO2 / MT C) * (QBtu / MMBtu) * (kg C / Tg C) Assumed passenger cars for emissions factors. Only included vehicle operation emissions. NOx emissions factor is an average of two near-term technologies for passenger cars: CNG bi-fuel and CNG dedicated (g/mi). Converted from g/mi to kg NOx/MMBtu using fuel economy in units MMBtu/mile. Fuel economy was calculated as the energy consumption of natural gas passenger cars divided by the vehicle miles traveled by light-duty cars (CNG ICE and CNG Bi-fuel). Used average emission factor across all years.
E85 Fleet kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / gallon = MMBtu / gallon * kg CO2 / MMBtu Assumed to be equal to gasoline fleet emissions factor.
B5 Fleet kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / gallon = MMBtu / gallon * kg CO2 / MMBtu Assumed to be equal to diesel fleet emissions factor.
B20 Fleet kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / gallon = MMBtu / gallon * kg CO2 / MMBtu Assumed to be equal to diesel fleet emissions factor.
B100 kg CO2 / Gallon   U.S. EPA. Inventory of U.S. Greenhouse Emissions and Sinks: 1990 - 2014. Released April 15, 2016. Annex 3, Section 3.1, Table A-93 (fuel consumption) and Table A-111 (NOx emissions) https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-a...   kg CO2 / MMBtu = (Tg C / Qbtu) * (% Oxidized) * (MT CO2 / MT C) * (QBtu / MMBtu) * (kg C / Tg C) Assumed to be equal to diesel fleet emissions factor.
Hydrogen kg CO2 / MMBtu   GREET 1.5 - Transportation Fuel-Cycle Model. Volume 2: Appendices of Data and Results. Table BII-1 (NOx emission factors).  https://www.anl.gov/energy-systems/publication/greet-15-transportation-f...   kg CO2 / MMBtu = (Tg C / Qbtu) * (% Oxidized) * (MT CO2 / MT C) * (QBtu / MMBtu) * (kg C / Tg C) Vehicle operation emissions from hydrogen vehicles are 0.
Other Fleet Fuel kg CO2 / MMBtu   n/a n/a n/a n/a Customized by users. No data entry here.