Question

what are the most common air pollutants?
a. carbon monoxide, sulfur dioxide, and nitrogen.
b. hydrogen, nitrogen, cyanide.
c. ozone, carbon monoxide, and sulfur dioxide.
d. ozone, carbon dioxide, and hydrogen.

Explanation:

Ozone, carbon monoxide, and sulfur dioxide are well - known air pollutants. Nitrogen, hydrogen are not primary air pollutants in the context.

Answer:

C. Ozone, carbon monoxide, and sulfur dioxide.