Which policy law established air-quality standards and regulations on the source of pollutants?

• A. Clean Air Act of 1970
• B. National Environmental Policy Act
• C. Clean Water Act
• D. Endangered Species Act

Answer: (A)

The main idea here is about regulating air quality by setting standards and controlling where pollutants come from. The Clean Air Act does exactly that: it directs the EPA to establish National Ambient Air Quality Standards for pollutants that affect health and welfare, and it requires regulation of emissions from major sources through permits and technology-based standards. It also mandates state implementation plans to meet those standards and to regulate new or modified sources. This creates a comprehensive framework for both how clean the air should be and how emissions from factories, vehicles, and other sources must be controlled. The other laws focus on different areas—like how federal actions are reviewed for environmental impact, pollution in waterways, or protection of endangered species—so they don’t set air-quality standards and emission regulations in the same way.