Question

which of these is listed by epa as a criteria air pollutant? select one: a. chlorofluorocarbons b. mercury c. stratospheric ozone d. carbon monoxide

Explanation:

The U.S. Environmental Protection Agency (EPA) lists six major criteria air pollutants: particulate matter, ground - level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. Carbon monoxide is one of them. Chlorofluorocarbons are mainly related to ozone - layer depletion, mercury is a toxic heavy - metal but not a primary criteria air pollutant in the same sense, and stratospheric ozone is beneficial and not a pollutant on the criteria list.

Answer:

D. carbon monoxide