Which statement is not true about photochemical smog?

• A

  Photochemical smog occurs in warm, dry and sunny climate.
• B

  Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxvacetyl nitrate.
• Correct answer
  C

  Photochemical smog is harmful to humans but has no effect on plants.
• D

  Plants like Pinus, Juniparus can help in reducing the photochemical smog.

Hence, the correct answer is option: 'C'.