Multiple choice

Which of the following options is not a pollutant unless it is in excess?

  1. Sulphur dioxide

  2. Carbon monoxide

  3. Carbon dioxide

  4. Nitrogen dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. Carbon dioxide itself is not a pollutant but excess carbon dioxide in the atmosphere traps the heat of Sun.

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