This action, effective May 24, 2024, adopts standards for measuring non-volatile particulate matter (nvPM) exhaust emissions from aircraft engines. With this rulemaking, the FAA implements the nvPM emissions standards adopted by the Environmental Protection Agency (EPA) last year, fulfilling the statutory obligations of the FAA under the Clean Air Act. Although the FAA has no authority to change any of the emission standards or procedures adopted by the EPA, the FAA is requesting comments from interested parties regarding the parts of this rulemaking that adopt the certification regulations in FAR Part 34 (Fuel Venting and Exhaust Emission Requirements for Turbine Engine Powered Airplanes) and implement them at the time of aircraft engine certification. The FAA will review and consider any comments received. Comments are due by June 24, 2024.
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