This guide contains tables listing 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). This guide is for reference purposes only; it does not include detailed information about all variations and restrictions associated with the standards. Refer to each table to find the applicable Code of Federal Regulations (CFR) citations which provide complete information on the standards.