Opinion for the Court filed by Circuit Judge SCALIA.
SCALIA, Circuit Judge:
Section 207 of the Clean Air Act, 42 U.S.C. § 7541 (1982) provides that if the Administrator of the Environmental Protection Agency ("EPA") determines that a substantial number of any class or category of vehicles or engines fail during their statutorily defined useful life to conform to the regulations establishing maximum emission levels, the Administrator shall require the...
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