Which is always present in photochemical smog?

Which is always present in photochemical smog?

Options

(a) ozone
(b) CO₂
(c) SO₂
(d) CH₄

Correct Answer:

ozone

Explanation:

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  • I think because photochemical smog includes PAN, ozone(O3), and NO, NO2. And Classical smog includes CO2, SO2 and H2S.

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