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The correct set of species responsible for the photochemical smog is:

1. NO, NO2, O3 and hydrocarbons
2. N2, NO2 and hydrocarbons
3. CO2, NO2, SO2 and hydrocarbons
4. N2, O2, O3 and hydrocarbons

Correct answer: NO, NO2, O3 and hydrocarbons

Solution

The correct option includes nitrogen oxides (NO and NO2), ozone (O3), and hydrocarbons, which are key components in the formation of photochemical smog through complex reactions driven by sunlight.

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