American Chemistry Council v. Environmental Protection Agency

Holding: The Clean Air Act neither compels nor permits the Environmental Protection Agency to adopt an interpretation of the Clean Air Act requiring a stationary source of pollution to obtain a “Prevention of Significant Deterioration” or Title V permit on the sole basis of its potential greenhouse-gas emission. However, EPA reasonably interpreted the Clean Air Act to require sources that would need permits based on their emission of chemical pollutants to comply with “best available control technology” for greenhouse gases.

JudgmentAffirmed in part and reversed in part. on June 23, 2014. Justice Scalia announced the judgement of the Court and delivered an opinion, Parts I and II of which were for the Court. Justice Thomas and Justice Alito joined the opinion as to Parts I, II-A, II-B-1, and Justice Ginsburg, Justice Breyer, Justice Sotomayor and Justice Kagan joined as to Part II-B-2. Justice Breyer filed an opinion concurring in part and dissenting in part, in which Justice Ginsburg, Justice Sotomayor, and Justice Kagan joined. Justice Alito filed an opinion concurring in part and dissenting in part, in which Justice Thomas joined.

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