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Regulations and Standards

Below are the Heavy-Duty Highway Diesel regulations and standards. The links will either take you directly to the rulemaking document, if there's only one document, or the link will take you to a page that has the rulemaking document and all the associated documents for that rule.

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.

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