Question

A secondary pollutant is

• A. CO
• B. CO${}_2$
• C. Aerosol
• D. PAN

Answer 1

The correct option is D PAN

Secondary pollutants

Secondary pollutants are those pollutants that are not directly emitted from a specific source but are formed in the atmosphere when primary pollutants interact in the atmosphere.

PAN

PAN stands for peroxyacetyl nitrate which is considered as a secondary pollutant as it is formed by the reaction of hydrocarbons, nitrogen oxides (emitted directly by the polluting sources) along with ozone in the presence of sunlight.

Final answer

(C) PAN