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New Emission Standards for Heavy-Duty Diesel Engines Use in Trucks and Buses

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.

October 1997 Final Rule - New Emission Standards for Heavy-duty Diesel Engines Used in Trucks and Buses 

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