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Formaldehyde in indoor air comes mainly from

  • A.Unvented kerosene heaters alone
  • B.Outdoor infiltration
  • C.Human respiration
  • D.Pressed wood products and their resins

Answer: D

Urea-formaldehyde resins in particle board, plywood and medium density fibreboard release the gas slowly for years, and the rate rises with temperature and humidity. Emission falls roughly exponentially as the material ages.

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