U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 1039Subpart F - Subpart F—Test Procedures
§ 1039.501 - How do I run a valid emission test?
§ 1039.505 - How do I test engines using steady-state duty cycles, including ramped-modal testing?
§ 1039.510 - Which duty cycles do I use for transient testing?
§ 1039.515 - What are the test procedures related to not-to-exceed standards?
§ 1039.520 - What testing must I perform to establish deterioration factors?
§ 1039.525 - How do I adjust emission levels to account for infrequently regenerating aftertreatment devices?
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