This guide contains federal emission standards for on-road and nonroad vehicles and engines, and related fuel sulfur standards. Each table includes the standards, useful life, warranty period, and the availability of averaging, banking, and trading (ABT). In addition, the applicable Code of Federal Regulations (CFR) citations are provided.

This guide is for reference purposes only; it does not include detailed information about all variations and restrictions associated with the standards.  The regulated community should refer to the CFR for complete information on all standards to ensure compliance.

• Learn about the Emission Standards Reference Guide
• All federal emission standards
  • Light-duty vehicles and trucks and motorcycles emission standards
  • Heavy-duty highway engines and vehicles emission standards
  • Nonroad engines and vehicles emission standards
  • Fuel sulfur standards
• Vehicle weight classifications