VEHICLES

CH4 and N2O Emissions

Mobile Combustion CH4 and N2O Emissions

Unlike CO2 emissions, CH4 and N2O emissions from mobile combustion sources depend more on the emission control techniques employed in the vehicle rather than fuel type. Calculating emissions of CH4 and N2O requires data on vehicle characteristics (which takes into account emission control technologies) and vehicle miles traveled. Because of this distinction, guidance on calculating CO4 and N2O is provided separately from guidance on calculating CO2.

The recommended and alternate activity data and emission factors for calculating Scope 1 CH4 and N2O emissions from mobile combustion are found below:

Recommended Approach: Annual Mileage by Vehicle Type, Model Year and Fuel Type:

Alternate Approach 1: Fuel use by vehicle type, model year, and fuel type

Alternate Approach 2: Annual mileage by vehicle type and fuel type

Alternate Approach 3: Proxy year data

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