State of California v. EPA, No. 21-1018 (D.C. Cir. 2023)
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After finding that certain greenhouse gases endanger public health, the Environmental Protection Agency (“EPA”) regulated the emission of these pollutants from aircraft engines. The Aircraft Rule aligns domestic aircraft emissions standards with those recently promulgated by the International Civil Aviation Organization (“ICAO”). Petitioners challenge the Aircraft Rule, arguing the EPA should have promulgated more stringent standards than those set by ICAO. They contend the agency acted unlawfully as well as arbitrarily and capriciously by aligning domestic standards with ICAO’s technology-following standards rather than establishing technology-forcing standards.
The DC Circuit denied the petitions. The court held that the Aircraft Rule is within the EPA’s authority under section 231 of the Clean Air Act and that the agency reasonably explained its decision to harmonize domestic regulation with the ICAO standards. The court reasoned that the EPA possesses substantial discretion to regulate aircraft emissions under section 231 of the Clean Air Act. In aligning domestic regulation with standards promulgated by ICAO, the EPA acted lawfully, and petitioners have not shown the agency’s decision was arbitrary and capricious.
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