environment hard MCQ

Which of the following is classified as a secondary air pollutant?

  1. Carbon monoxide
  2. Sulphur dioxide
  3. Tropospheric Ozone
  4. Particulate Matter

Answer: Tropospheric Ozone

Secondary pollutants are not emitted directly but form when primary pollutants react in the atmosphere. Ground-level ozone is a classic example.

Topic Environmental Pollution
Exam Relevance UPSC, SSC
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