Which of the following is NOT a feature of the Clean Air Act of 1970?

• A. Establish national standards for states
• B. Enforce strict auto emissions guidelines
• C. Regulate air pollution for private industry
• D. Provisions for water regulation

Answer: (D)

Air quality regulation is the core aim of the Clean Air Act. It creates national standards for air quality, requires states to develop plans to meet those standards, and tightens controls on emissions from major industries and from motor vehicles. A provision for water regulation belongs to the Clean Water Act, not the Clean Air Act, since water quality and discharges are handled separately. So the statement about water regulation is not a feature of the Clean Air Act, while the other options describe actions that the act does implement to improve air quality.