How do I calculate emissions for a hydrogen fuel cell bus?
The bus emits only water, so the footprint lies in the hydrogen. Multiply kg of hydrogen used per km by the CO2 per kg from its production: high for hydrogen from natural gas, low for electrolysis on renewable power. Ask the supplier for that figure.
Scopes
No Scope 1 from the bus itself. Emissions from producing bought hydrogen sit in Scope 3 Category 3. If you make hydrogen on site, the electricity or gas you use is Scope 2 or Scope 1.
Compare fairly
Set a diesel or electric bus beside it on the same route, with the same km and passengers, before claiming a saving.
What Senseible does here
Senseible reads bills, fuel invoices and production records into dated, fingerprinted records, so the figure you send a buyer can be traced to its documents.
Sources: GHG Protocol Corporate Standard, GHG Protocol Corporate Value Chain (Scope 3) Standard, International Energy Agency
Last reviewed 2026-10-22.