Held. Yes. Reversed the judgment of the Court of Appeals. The EPA’s definition of the term “source” is a permissible construction of the statute which seeks to accommodate progress in reducing air pollution with economic growth. A review of the EPA’s varying interpretations of “source” over time demonstrated that it consistently viewed the term flexibly, in the context of implementing policy decisions in a technical and complex arena. It was not the agency, but the Court of Appeals, that read the statute inflexibly in 1980 to command a plant-wide definition for plants designed to maintain clean air, and a to forbid such a definition for programs designed to improve air quality. It was a basic legal error for the Court of Appeals to adopt a static definition of the term “stationary source” when it had decided that Congress itself had not commanded that definition. Dissent. None. Concurrence. None.
Discussion. Chevron was a landmark case that advocated giving agencies deference for their reasonable policy-making decisions.
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