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Which of the following is the most dangerous pollutant?

  • A.Nitrous oxide
  • B.Carbon dioxide
  • C.Sulphur dioxide
  • D.Carbon monoxide

Answer: D

Carbon monoxide is the most dangerous of these pollutants. It is colourless and odourless and binds to haemoglobin about 240 times more strongly than oxygen does.

The blood is then unable to carry oxygen, and a few hundred parts per million can kill within hours without any warning to the victim.

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