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In-Use Testing for Heavy-Duty Engines and Vehicles

For a list of Heavy-Duty Highway regulations and standards, go to the Regulations and Standards page.

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.

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