Answered

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please help! I will give brainly! x

Why was 1990 an important year regarding air quality?

The United States took first steps to keep the air clean.
The United States created the Environmental Protection Agency.
Modifications and improvements were made to the Clean Air Act.
Funding was established under the Clean Air Act to study air pollution.

Sagot :

Ragnarok74

Answer:

C. Modifications and improvements were made to the clean Air Act.

Explanation:

Btw I answered first

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