{"abstract":"In this action, the U.S. Environmental Protection Agency (EPA) is proposing to repeal all greenhouse gas (GHG) emission standards for light-duty, medium-duty, and heavy-duty vehicles and engines to effectuate the best reading of Clean Air Act (CAA) section 202(a). We propose that CAA section 202(a) does not authorize the EPA to prescribe emission standards to address global climate change concerns and, on that basis, propose to rescind the Administrator's prior findings in 2009 that GHG emissions from new motor vehicles and engines contribute to air pollution which may endanger public health or welfare. We further propose, in the alternative, to rescind the Administrator's prior findings in 2009 because the EPA unreasonably analyzed the scientific record and because developments cast significant doubt on the reliability of the findings. Lastly, we propose to repeal all GHG emission standards on the alternative bases that no requisite technology for vehicle and engine emission control can address the global climate change concerns identified in the findings without risking greater harms to public health and welfare.","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/2025/08/01/2025-14572.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"85","title":40},{"chapter":null,"citation_url":null,"part":"86","title":40},{"chapter":null,"citation_url":null,"part":"600","title":40},{"chapter":null,"citation_url":null,"part":"1036","title":40},{"chapter":null,"citation_url":null,"part":"1037","title":40},{"chapter":null,"citation_url":null,"part":"1039","title":40}],"citation":"90 FR 36288","comment_url":null,"comments_close_on":"2025-09-15","correction_of":null,"corrections":[],"dates":"Comments. Comments must be received on or before September 15, 2025. Comments on the information collection provisions submitted to the Office of Management and Budget (OMB) under the Paperwork Reduction Act (PRA) are best assured of consideration by OMB if OMB receives a copy of your comments on or before September 2, 2025.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2025-0194","FRL-12715-01-OAR"],"dockets":[{"supporting_documents":[{"title":"Reincarnating the \"Major Questions\" Exception to Chevron Deference as a Doctrine of Non-Interference (Or Why Massachusetts v. 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Forecasting of Global Carbon Dioxide Emissions Reducing Uncertainties Using a Per Capita Approach","document_id":"EPA-HQ-OAR-2025-0194-0087"},{"title":"Climate Change 2021 The Physical Science Basis","document_id":"EPA-HQ-OAR-2025-0194-0085"},{"title":"How Much Has the Sun Influenced Northern Hemisphere Temperature Trends An Ongoing Debate","document_id":"EPA-HQ-OAR-2025-0194-0081"}],"agency_name":"EPA","documents":[{"comment_count":571676,"comment_start_date":"2025-08-01","updated_at":"2026-06-25T01:56:40.910-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OAR-2025-0194-0093","allow_late_comments":false,"id":"EPA-HQ-OAR-2025-0194-0093","comment_end_date":"2025-09-23","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":180,"id":"EPA-HQ-OAR-2025-0194","title":"Rescission of the Greenhouse Gas Endangerment Finding and Motor Vehicle Greenhouse Gas Emission Standards Under the Clean Air 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