This page provides links to regulations for controlling greenhouse gas (GHG) emissions, smog, soot and other air pollution from onroad vehicles.

Final Rule Improvements Heavy Duty Engine and Vehicle Test

Passenger Vehicles
(Light-Duty)

• Regulations for GHG emissions from passenger cars & trucks
• Regulations for smog, soot, and other air pollution from passenger cars & trucks

Commercial Trucks & Buses
(Heavy-Duty)

• Regulations for GHG emissions from commercial trucks & buses
• Regulations for smog, soot, and other air pollution from commercial trucks & buses

Motorcycles
(Light-Duty)

• Regulations for smog, soot, and other air pollution from non-electric motorcycles