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Carbon monoxide indoors is most commonly produced by

  • A.Incomplete combustion
  • B.Off-gassing from carpets
  • C.Photocopiers and printers
  • D.Damp building fabric

Answer: A

Any fuel-burning appliance short of air produces it, and an unvented or blocked flue delivers it straight into the occupied space. Because it is colourless and odourless the first warning is usually a symptom rather than a smell.

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