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Carbon dioxide is commonly measured indoors because it acts as

  • A.A measure of particulate loading
  • B.An indicator of radon entry
  • C.A surrogate for the adequacy of ventilation per occupant
  • D.A directly toxic pollutant at indoor levels

Answer: C

Occupants generate it at a fairly predictable rate, so its steady concentration above the outdoor value reflects the outdoor air supplied per person. It says nothing about sources unrelated to people, which is the usual misreading of the measurement.

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