Which one of the following pollutant (or) pairs of pollutants is formed due to photochemical reactions?
Which one of the following pollutant (or) pairs of pollutants is formed due to photochemical reactions?

Q. Which one of the following pollutant (or) pairs of pollutants is formed due to photochemical reactions?

  1. O3 and PAN
  2. CO alone
  3. NH3 and CO
  4. PAN and NH3

Answer: O3 and PAN

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