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What is the composition of photochemical smog?

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What is the composition of photochemical smog?

(a) Nitrogen oxides, ketones and ozone

(b) VOCs and hydrocarbons

(c) Peroxy-acetyl-nitrate, peroxy-benzoyl-nitrate, peroxy fornyl-nitrate

(d) All of the mentioned

I got this question in an interview for internship.

My enquiry is from Particulates in portion Particulates, Acid Rain & Aerosols of Environmental Engineering

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Correct answer is (d) All of the mentioned

Easiest explanation: The photochemical smog constitutes of oxides of nitrogen, aldehydes, ketones, ground level ozone as well as PAN, PBN, PFN which are the free radicals formed due to reaction of ketones, nitrogen oxides and oxygen in the presence of sunlight.

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