Biology, 05.02.2021 01:00 theresamarieuehling2

Please help! I will give 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.

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Please help! I will give x Why was 1990 an important year regarding air quality?

The Un...