environment medium MCQ

Which of the following pollutants is primarily responsible for the formation of photochemical smog?

  1. Sulphur dioxide and particulate matter
  2. Nitrogen oxides and volatile organic compounds
  3. Carbon monoxide and lead
  4. Methane and carbon dioxide

Answer: Nitrogen oxides and volatile organic compounds

Photochemical smog forms when sunlight triggers reactions between NOx and VOCs, producing ozone and other secondary pollutants.

Topic Environmental Pollution
Exam Relevance UPSC, SSC