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Which of the following causes the photochemical smog?

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Which of the following causes the photochemical smog?

(a) Excess O2

(b) CO and CO2

(c) Soot and particulate matter

(d) NOx and HC

This question was posed to me in my homework.

I would like to ask this question from Engine Emissions topic in chapter Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

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The correct answer is (d) NOx and HC

Explanation: NOx is one of the primary causes of photochemical smog. This smog is formed by the photochemical reaction of automobile exhaust and atmospheric air in the presence of sunlight.

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