The core premise of the Clean Air Act was passed by Congress in 1970, with amendments in 1977 and 1990 to extend deadlines and specify new strategies. The standards set by the EPA on new sources of pollution is an overall success. Emissions of toxic lead has decreased by 98%, emissions of sulfur dioxide has decreased 35%, and carbon monoxide had decreased 32%. Concerns are still evident with many violations risking the health of the environment, but the Clean Air Act provides structure in attempting to protect air quality.
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