Which substance in the air of U.S. cities has decreased least since the Clean Air Act began?
A. carbon monoxide
B. ground-level ozone
C. particulate matter
D. sulfur dioxide

Question

laurynmoon2008 laurynmoon2008

03-05-2022
Physics

Answered

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Which substance in the air of U.S. cities has decreased least since the Clean Air Act began?
A. carbon monoxide
B. ground-level ozone
C. particulate matter
D. sulfur dioxide

Sagot :

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