{"abstract":"The Environmental Protection Agency (EPA) is proposing particulate matter (PM) emission standards and test procedures applicable to certain classes of engines used by civil subsonic jet airplanes (those engines with rated output of greater than 26.7 kilonewtons (kN)) to replace the existing smoke standard for aircraft. These proposed standards and test procedures are equivalent to the engine standards adopted by the United Nations' International Civil Aviation Organization (ICAO) in 2017 and 2020 and would apply to both new type design aircraft engines and in-production aircraft engines. The EPA, as well as the United States Federal Aviation Administration (FAA), actively participated in the ICAO proceedings in which these requirements were developed. These proposed standards would reflect the importance of the control of PM emissions and U.S. efforts to secure the highest practicable degree of uniformity in aviation regulations and standards. Additionally, the EPA is proposing to migrate, modernize, and streamline the existing regulations into a new part. As part of this update, the EPA is also proposing to align with ICAO by applying the smoke number standards to engines less than or equal to 26.7 kilonewtons rated output used in supersonic airplanes.","action":"Proposed rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2022/02/03/2022-01150.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"87","title":40},{"chapter":null,"citation_url":null,"part":"1030","title":40},{"chapter":null,"citation_url":null,"part":"1031","title":40}],"citation":"87 FR 6324","comment_url":null,"comments_close_on":"2022-04-04","correction_of":null,"corrections":[],"dates":"Comments on this proposal must be received on or before April 4, 2022.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2019-0660","FRL-7558-01-OAR"],"dockets":[{"supporting_documents":[{"title":"EPA Meeting with El Centro De La Raza/Beacon Hill Council - March 17, 2022, Memo to the Docket, Bryan Manning, March 25, 2022","document_id":"EPA-HQ-OAR-2019-0660-0173"},{"title":"EPA Meeting with Air Inc of East Boston and Somerville Transportation Equity Partnership (STEP) - March 16, 2022, EPA Memo to the Docket, Bryan Manning, March 24, 2022","document_id":"EPA-HQ-OAR-2019-0660-0172"},{"title":"EPA, Meeting with National Tribal Air Association (NTAA) Mobile Sources Work Group – February 3, 2022, Memo to the Docket, Bryan Manning, March 4, 2022","document_id":"EPA-HQ-OAR-2019-0660-0171"},{"title":"Aircraft PM Hearing Transcript - 2022-02-17","document_id":"EPA-HQ-OAR-2019-0660-0160"},{"title":"Ugrekhelidze, D., et al, Uptake and Transformation of Benzene and Toluene by Plant Leaves, Ecotoxicology and Environmental Safety 37, 24-29 (1997)","document_id":"EPA-HQ-OAR-2019-0660-0127"},{"title":"Rothman, N., et al, Hematotoxocity Among Chinese Workers Heavily Exposed to Benzene, American Journal of Industrial Medicine 29:236-246 (1996)","document_id":"EPA-HQ-OAR-2019-0660-0126"},{"title":"Qu, Q., et al, \"Hematological Changes Among Chinese Workers With a Broad Range of Benzene Exposures,\" American Journal of Industrial Medicine 42:275–285 (2002)","document_id":"EPA-HQ-OAR-2019-0660-0124"},{"title":"Perera, F. 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