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The primary pollutant that leads to photochemical smog is: (1) acrolein (2) ozone (3) sulphur dioxide (4) nitrogen oxides

1. acrolein
2. ozone
3. sulphur dioxide
4. nitrogen oxides

Correct answer: nitrogen oxides

Solution

Nitrogen oxides are the main contributors to the formation of photochemical smog, as they react with sunlight and volatile organic compounds to produce ozone and other harmful pollutants.

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