The U.S Environmental Protection Agency (EPA) has issued a notice of proposed rulemaking to adopt particulate matter emission standards and test procedures to replace the current smoke standard for large subsonic jet airplanes.
These would be applicable to aircraft engines with a maximum thrust available for takeoff greater than 26.7 kilonewtons. Standards for in-production airplanes would have different emission limits and they would depend on the rated output of the engines.
This proposal is separate from the recently adopted EPA regulation that established CO2 emission standards on large jets and turboprops. Comments on this proposal are due by April 4, 2022.
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S: AIN Online