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Indoor concentrations of many pollutants exceed outdoor concentrations mainly because

  • A.Sources sit inside a small, poorly ventilated volume
  • B.Outdoor air is cleaner than it used to be
  • C.Indoor air is warmer
  • D.Buildings filter incoming air

Answer: A

A source releasing at a given rate into a room reaches a far higher steady concentration than the same source outdoors, because the diluting volume and the air exchange are both small. Tightening buildings for energy efficiency made the effect worse rather than better.

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