Which of the following is not a secondary air pollutant ?
Correct answer: C. Sulphur dioxide
- A. Ozone
- B. Photochemical smog
- C. Sulphur dioxide
- D. All A., B. & C.
Explanation
Sulphur dioxide is emitted directly from fuel combustion and is therefore a primary pollutant. Ozone and photochemical smog form in the atmosphere through reactions involving primary pollutants, so they are secondary pollutants.
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