Which of the following features are true about Peroxyacyl Nitrate (PAN)?

1.PANs are secondary pollutants

2.PANs are produced when a hydrocarbon radical reacts with nitrogen oxide

3.PANs cause respiratory diseases in human beings

4.PAN causes irritation to the eyes

A1, 2, 3 and 4 are true ✓ Correct

B2 and 3 are true

C1 and 3 are true

DOnly 1 is true

Correct answer: (A) 1, 2, 3 and 4 are true

Explanation

Statement 1 is correct, as peroxyacyl nitrates are secondary pollutants formed within the atmosphere.

Statement 2 is correct, since they form when a hydrocarbon radical reacts with nitrogen oxides.

Statement 3 is correct, as they cause respiratory disease in people.

Statement 4 is correct, since they irritate the eyes, a hallmark of photochemical smog.

All four descriptions of these pollutants therefore hold true.

Peroxyacyl nitrates are a key component of photochemical smog over congested cities.

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