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6 February, 09:41

Why was 1990 an important year regarding air quality?

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  1. 6 February, 09:49
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  2. 6 February, 09:53
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    Why was 1990 an important year regarding air quality? Check all that apply.

    2. Cost-effective ways to reduce pollution were emphasized.

    4. Modifications and improvements were made to the Clean Air Act.

    i just took the test this is 100% correct
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