Which of the following pairs is secondary precursors of photochemical smog –

SO₂ and NO₂

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SO₂ and hydrocarbons

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NO₂ and hydrocarbons

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O₃ and PAN

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Solution

The correct option is D
O₃ and PAN

Photochemical smog does not contain $S O_{2}$ . Hence we straight away discard options (a) and (b).

$N O_{2}$ and hydrocarbons are primary precursors while $O_{3}$ , PAN, Formaldehyde, and Acrolein are secondary precursor of photochemical smog.

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