MR. JUSTICE REHNQUIST delivered the opinion of the Court.
The Clean Air Act authorizes the Administrator of the Environmental Protection Agency to promulgate "emission standards" for hazardous air pollutants "at the level which in his judgment provides an ample margin of safety to protect the public health." § 112 (b) (1) (B), 84 Stat. 1685, 42 U. S. C. § 1857c-7 (b) (1) (B). The emission of an air pollutant in
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