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Heavy Trucks, Buses, and Engines

Manufacturer-Run In-Use Testing

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EPA has adopted requirements for manufacturers of heavy-duty highway engines to perform in-use testing with certified engines. This page includes information from the rulemakings to adopt and modify these requirements. See heavy-duty highway engines for information on emission standards and other certification requirements.

Separate in-use testing requirements apply for Large SI engines and Marine SI engines.

Heavy-duty Highway Engines

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