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NEET levelSingle correct optionDifficulty 1 of 3ev004

Which of the following is present in photochemical smog but not in classical smog?

  1. ACoal smoke
  2. BPeroxyacetyl nitrate (PAN)
  3. CFog droplets
  4. DSulphur dioxide from burning coal

Answer: B

Photochemical smog contains , PAN, formaldehyde and acrolein formed from nitrogen oxides and hydrocarbons in sunlight. Classical smog is a mixture of smoke, fog and from coal burning, with no PAN.
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