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jan 1, 1970 - Clean Air Act - acid emission regulations

Description:

U.S. Congress imposed acid emission regulations through the Clean Air Act, strengthened two decades later in 1990. By the 2000s, sulfate and nitrate in precipitation had decreased by some 40 percent.

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Health and Wellness

Bychyelle Jiazten milgrom
9 Nov 2019
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Date:

jan 1, 1970
Now
~ 55 years ago
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