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If the smog density of an area increases, it indicates

1. Increase in agricultural waste
2. Increase in noise pollution
3. Vehicles of area is not under PUC norms
4. None of the above

Correct answer: Vehicles of area is not under PUC norms

Solution

Smog density rises when more pollutants are released into the air, especially from vehicles. If many vehicles fail PUC norms, their emissions are higher, which increases smog.

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