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Looking Back at 50 Years of the Clean Air Act

By Joseph E. Aldy, Maximilian Auffhammer, Maureen Cropper, Arthur Fraas, and Richard Morgenstern

Journal of Economic Literature, March 2022

We synthesize and review retrospective analyses of federal air quality regulations to examine the contributions of the Clean Air Act (CAA) to the vast air quality improvements seen since 1970. Geographic heterogeneity in stringency affects emissions, publ...