Light-Duty Vehicles and Trucks and Motorcycles

Go to the light-duty vehicles and trucks page to see the following standards:

• Clean Fuel Fleet -- exhaust emission standards
• Clean Fuel Fleet flexible fuel and dual fuel vehicles -- non-methane organic gas standards
• Tier 0, Tier 1, and Clean Fuel Vehicle (CFV) exhaust emission standards (light-duty trucks only)
• Tier 0, Tier 1, and National Low Emission Vehicle (NLEV) implementation schedule
• Tier 0, Tier 1, NLEV, and CFV exhaust emission standards
• Tier 1 and NLEV Supplemental Federal Test Procedure (SFTP) exhaust emission standards
• Tier 1 and NLEV evaporative emission standards and implementation schedule
• Tier 2 and interim non-Tier 2 SFTP exhaust emission standards
• Tier 2 evaporative emission standards
• Tier 2 exhaust emission standards and implementation schedule

Driving Cycles

• EPA Federal Test Procedure (FTP)
• EPA SC03 SFTP with air conditioning
• EPA Urban Dynamometer Driving Schedule (UDDS)
• EPA US06 or SFTP
• LA92 "Unified" Dynamometer Driving Schedule

Heavy-Duty Highway Engines and Vehicles

Go to the heavy-duty vehicles and trucks page to see the following standards:

• Clean Fuel Fleet program -- exhaust emission standards
• Compression-ignition (CI) engines and urban buses -- exhaust emission standards
• Spark-ignition (SI) engines -- exhaust emission standards
• SI and CI engines -- evaporative emission standards

Nonroad Engines and Vehicles

Go to the nonroad engines and vehicles page to see the following standards:

• Aircraft -- exhaust emission standards
• CI engines -- exhaust emission standards
• Large SI engines -- exhaust and evaporative emission standards
• Locomotives -- exhaust emission standards
• Marine CI engines -- exhaust emission standards
• Marine SI engines and vessels -- exhaust emission standards
• Recreational engines and vehicles -- exhaust emission standards
• SI engines 19 kilowatts (kW) and below -- exhaust emission standards
• SI engines 19kW and below, recreational engines and vehicles, and marine SI engines -- evaporative emission standards

Fuel Sulfur Standards

Go to the fuel sulfur standards page to see the following standards:

• Gasoline sulfur standards
• Highway, nonroad, locomotive, and marine (NRLM) diesel fuel sulfur standards