Final answer:
The Clean Air Act primarily affects industrial facilities and transportation sources by setting national standards to regulate emissions to protect public health and the environment.
Explanation:
The Clean Air Act primarily affects industrial facilities and transportation sources by setting national standards to regulate the emission of pollutants such as carbon monoxide, ground-level ozone, nitrogen dioxide, sulfur dioxide, lead, and particulate matter. These regulations aim to protect public health and the environment. State and local governments play a crucial role in monitoring air quality, enforcing regulations, and developing solutions for pollution problems under the Clean Air Act.
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