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How much has air pollution been reduced in the last three decades?
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How much has air pollution been reduced in the last three decades?

User Dhh
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The clean Air Act of 1970 is a US federal law intended to reduce air pollution and protect air quality. The act-which underwent major revisions in 1990 and 2003 deals with ambient air pollution as well as source specific air pollution. 
User Vikas Dadheech
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