Frequent Questions on EPA Greenhouse Gas (GHG) Provisions for Vehicle and Engine Conversions to be Used on Clean Alternative Fuel

View frequent questions on EPA GHG provisions for conversions of light-duty vehicles, medium-duty passenger vehicles, and certain classes of heavy-duty vehicles for clean alternative fuel.

• Frequently Asked Questions: EPA Greenhouse Gas Provisions for Clean Alternative Fuel Conversions of Light-Duty Vehicles and Medium-Duty Passenger Vehicles (pdf) (1.98 MB, August 2012, EPA-420-F-12-056)
• Frequently Asked Questions: EPA Greenhouse Gas Provisions for Clean Alternative Fuel Conversions of Heavy-Duty Vehicles that are Class 2b and 3 (pdf) (615.15 KB, October 2015, EPA-420-F-15-047)