Question

PAN (peroxyacetyl nitrate), an important constituent of photochemical smog is a

• A. Corollary pollutant
• B. Primary pollutant
• C. Natural pollutant
• D. Secondary pollutant

Answer 1

Answer: (D)

Secondary pollutant

Secondary air pollutants are produced photochemically from primary pollutants and are called photochemical oxidants. These occur in photochemical smog. Nitrogen oxides, oxygen and ketone bodies combine to form peroxy acyl nitrates or PAN, which is a major constituent of photochemical smog. PAN damages chloroplasts, inhibit electron system and spoil enzyme systems controlling cellular metabolism.

So, the correct answer is option D.