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Since the implementation of the Clean Air Act, the concentrations of all major air pollutants have decreased.

Since the implementation of the Clean Air Act, the concentrations of all major air pollutants have decreased.
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Since the implementation of the Clean Air Act, the concentrations of all major air pollutants have decreased.

User Hiero De Paula
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Answer:

you are correct

Step-by-step explanation:

User Mannopson
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