Question

Nitrogen oxides are emitted from high temperature combustion reactions. Nitrogen oxides are an example of _______.
a. primary pollutants
b. secondary pollutants
c. tertiary pollutants
d. none of the above

Answer 1

The correct answer in this question is option B. Nitrogen oxides are an example of secondary pollutants. A secondary pollutant when emitted directly is not harmful. When it combines with other pollutants, it will lead to damage in the environment such as acid rain.