Consider the relevance of the following features for causing

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Civil Engineering

54

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Consider the relevance of the following features for causing photochemical smog:
1) Air stagnation
2) Abundant sunlight
3) High concentration of NO_x in atmosphere.
4) High concentration of SO₂ in atmosphere.
Which of the above statements are correct?

[ESE (IES) CE 2016 P2]

A 1, 2 and 4 only

B 3 and 4 only

C 1, 2 and 3 only

D 1, 2, 3 and 4