Which of the following is a secondary air pollutant ?
Correct answer: C. Photochemical smog
- A. Nitrogen dioxide
- B. Sulphur dioxide
- C. Photochemical smog
- D. Dust particles
Explanation
Photochemical smog is formed in the atmosphere when nitrogen oxides and hydrocarbons react in sunlight, so it is a secondary pollutant. Sulphur dioxide and dust are directly released and are normally classified as primary pollutants.
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