c10:No. 10-174

Justice Alito,
with whom Justice Thomas joins,
concurring in part and concurring in the judgment.
I concur in the judgment, and I agree with the Court’s displacement analysis on the assumption (which I make for the sake of argument because no party contends otherwise) that the interpretation of the Clean Air Act, 42 U. S. C. § 7401 et seq., adopted by the majority in Massachusetts v. EPA, 549 U. S. 497 (2007), is correct.

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