Question

what are the most common air pollutants?

a. ozone, carbon monoxide, and sulfur dioxide.
b. ozone, carbon dioxide, and hydrogen.
c. carbon monoxide, sulfur dioxide, and nitrogen.
d. hydrogen, nitrogen, cyanide.

Explanation:

Ozone at ground - level, carbon monoxide from incomplete combustion, and sulfur dioxide from burning fossil fuels are common air pollutants. Carbon dioxide is a greenhouse gas but not as directly harmful as the others in small - scale air quality context. Hydrogen and nitrogen are not typical air pollutants in the same sense, and cyanide is not among the most common air pollutants compared to the ones in option A.

Answer:

A. Ozone, carbon monoxide, and sulfur dioxide.