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

Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and other Technical Amendments

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