Which of the following is a secondary pollutant?

Options

A ${SO}_{2}$
B ${CO}_{2}$
C $CO$
D ${O}_{3}$

Correct answer

D. ${O}_{3}$

Step-by-step solution

{O}_{3}

is a secondary pollutant. It is called a "secondary" pollutant because it is produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants are nitrogen oxides (NOx) and volatile organic compounds (VOCs)

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