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1 Jan 1970 Jahr - Clean Air Act - acid emission regulations

Beschreibung:

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.

Zugefügt zum Band der Zeit:

Health and Wellness

Bychyelle Jiazten milgrom
9 Nov 2019
0
0
521

Datum:

1 Jan 1970 Jahr
Jetzt
~ 55 years ago
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