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

Descrição:

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.

Adicionado na linha do tempo:

Health and Wellness

Bychyelle Jiazten milgrom
9 nov 2019
0
0
527

Data:

1 jan 1970 ano
Agora
~ 55 years ago
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