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Heavy Trucks, Buses, and Engines

Nonconformance Penalties

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.

The Clean Air Act created a path for EPA to establish a mechanism for manufacturers to pay a penalty instead of meeting current emission standards. This authority is currently limited to heavy-duty highway engines and highway motorcycles, but EPA may seek to expand the authority for setting nonconformance penalties in the future. This page includes rulemaking activities related to heavy-duty highway engines.


This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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