MR. JUSTICE WHITE delivered the opinion of the Court.
The question for decision in this case is whether a State whose federally approved implementation plan forbids an air contaminant source to operate without a state permit may require existing federally owned or operated installations to secure such a permit. The case presents an issue of statutory construction requiring examination of the Clean Air Act, as amended, 42 U. S. C. § 1857 et seq., and its...
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