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Ozone is produced indoors by

  • A.Corona discharge equipment
  • B.Pressed wood products
  • C.Soil gas entry
  • D.Human respiration

Answer: A

Any device with a high voltage corona can generate it, and so can ozone-emitting air cleaners sold as purifiers. It also reacts with indoor organics to form irritating secondary products, so it is a poor thing to add deliberately.

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