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Photochemical smog pollution does not contain

  1. Nitrogen dioxide
  2. Carbon dioxide
  3. PAN (peroxy acyl nitrate)
  4. Ozone

Correct answer: Carbon dioxide

Solution

Photochemical smog forms when nitrogen oxides and hydrocarbons react in sunlight, producing ozone and PAN among other oxidants. Carbon dioxide is not a characteristic component of this smog mixture.

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