Question

Example of secondary pollutants.

Options

• Smog

• O₃

• PAN

• All of these

Answer 1

O₃ 

Explanation:

Ozone, which is generated when hydrocarbons (HC) and nitrogen oxides (NO₂) combine in the presence of sunlight, NO₂, which is formed when no oxygen in the air combines, and acid rain are examples of secondary pollutants.