Question

Ozone is considered as secondary pollutant because

• A. It is formed by the oxidation of $O_2$ of the atmosphere
• B. It is formed by the transformation of $N{O}_x$ in sunlight
• C. It is not primarily important
• D. It develops secondary effects on living organisms

Answer 1

The correct option is B It is formed by the transformation of $N{O}_x$ in sunlight

Ozone is secondary pollutant because it is not emitted directly but is produced in a cycle of reactions involving two basic classes of compounds i.e., nitrogen oxides generically called NOx, including NO (nitric oxide) and NO2 and hydrocarbons.

So, the correct answer is option B.