US bus transport

Bus generic US data is from the GHGP worksheet GHG emissions from transport or mobile sources v2.0. This category allows the user to calculate emissions from a bus journey on a per vehicle basis, while the /perpassenger subcategory contains emissions calculations on a per passenger basis.

To use this category select the type of bus fuel from the following options using the drill-down fuelType:

• cng
• ethanol
• diesel
• gasoline

The distance is then set as a profile item value. The algorithm returns a sum of CO₂, N₂O and CH₄ emissions for the fuel type and distance specified.

Biomass fuels

The GHG protocol requires CO₂ emissions from biomass fuels to be reported separately, due to the fact that the CO₂ released from biomass fuels has only recently been sequestered from the atmosphere and so does not constitute a net increase in CO₂, unlike fossil fuel emissions or those of CH₄ and N₂O. Therefore, only the CH₄ and N₂ emissions for ethanol are included here, while the associated CO₂ emissions can be found in the biomass subcategory. If the user wishes to calculate their total GHG emissions from ethanol-powered bus travel (i.e. including the biomass CO2 component), they should use both categories in combination.