Which of the following statements are true in the context of particulate matter?

1.Particulate matter is basically a mist, more prevalent in winter weather

2.It is more prevalent in diesel-engine vehicles

3.Long-term exposure can harm the respiratory tract and lung functions

A1 and 2

B2 and 3 ✓ Correct

C1, 2 and 3

D1 and 3

Correct answer: (B) 2 and 3

Explanation

The true set is Statement 2 and Statement 3, on diesel prevalence and long-term lung harm.

Statement 1 is wrong: particulate matter is solid or liquid particles, not a mist, though it can seem heavier in winter.

Statement 2 is right: it is more prevalent in diesel-engine vehicles.

Statement 3 is right: long-term exposure can damage the respiratory tract and lung function.

A mist is suspended water droplets, a different thing from dry particulate matter.

Fine particulates are measured as PM2.5 and PM10 by diameter.

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