Which one of the following pairs of pollutants is formed due to photochemical reactions?

Which one of the following pairs of pollutants is formed due to photochemical reactions?

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

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

Answer: O3 and PAN

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