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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 gen 1970 anni - Clean Air Act - acid emission regulations

Descrizione:

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.

Aggiunto al nastro di tempo:

Health and Wellness

Bychyelle Jiazten milgrom
9 nov 2019
0
0
527

Data:

1 gen 1970 anni
Adesso
~ 55 years ago
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