Which is not a primary pollutant?
A)carbon monoxide
B)nitrogen dioxide
C)ground-level ozone
D)sulfur dioxide

Question

Quizplus · Accepted Answer

Ground-level ozone is a secondary pollutant, which means it is not directly emitted into the atmosphere but forms through chemical reactions between other pollutants. Carbon monoxide, nitrogen dioxide, and sulfur dioxide are all primary pollutants, meaning they are directly emitted into the atmosphere.

Which Is Not a Primary Pollutant