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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
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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

User Ansate
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1 Answer

6 votes

Answer: the answer is carbon monoxide

Step-by-step explanation:

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User Iqbal S
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