Since 1970, transportation, power generation, and manufacturing have dramatically transformed as air pollutant emissions have fallen significantly. To evaluate the causal impacts of the Clean Air Act on these changes, we synthesize and review retrospective analyses of air quality regulations. The geographic heterogeneity in regulatory stringency common to many regulations has important implications for emissions, public health, compliance costs, and employment.
Looking Back at 50 Years of the Clean Air ActJoe Aldy, Maximilian Auffhammer, Maureen Cropper, Art Fraas, Richard Morgenstern ,
Looking Back at 50 Years of the Clean Air Act