Which of the following statements is true of national ambient air quality standards (NAAQS)?

Question

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NAAQS are set at two different levels: primary and secondary. Primary standards are set to protect public health, while secondary standards are set to protect public welfare, including crops, animals, and buildings. NAAQS apply to both stationary sources of pollution (such as factories) and mobile sources (such as cars). While the federal government sets the standards, states are responsible for implementing and enforcing them.

Which of the Following Statements Is True of National Ambient