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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 40
Chapter I
Part 1048
Subpart F - Subpart F—Test Procedures
§ 1048.501 - How do I run a valid emission test?
§ 1048.505 - How do I test engines using steady-state duty cycles, including ramped-modal testing?
§ 1048.510 - What transient duty cycles apply for laboratory testing?
§ 1048.515 - What are the field-testing procedures?
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