Air pollution is accurately described by which of the following?

A. Air pollution occurs when more pollutants are emitted into the atmosphere than can be safely absorbed and diluted by natural processes.
B. The EPA has identified hundreds of "criteria" pollutants, relatively common harmful substances that serve as indicators of overall levels of air pollution.
C. A majority of the people in the United States breathe unsafe air for at least part of the year.
D. Air pollution caused by particulate matter is responsible for fewer than 600 premature or unnecessary deaths annually.


Answer: A

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