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Which one of the following air pollution can affect blood stream leading to death ?

  • A.Lead
  • B.Carbon monoxide
  • C.Asbestos dust
  • D.Cadmium

Answer: B

Carbon monoxide acts on the bloodstream and can kill.

It binds to haemoglobin about 240 times more strongly than oxygen does, forming carboxyhaemoglobin, so the blood can no longer carry oxygen. Being colourless and odourless it gives no warning.

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