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A primary air pollutant is one that is

  • A.Emitted directly to the atmosphere from an identifiable source
  • B.Formed in the atmosphere by reaction between other pollutants
  • C.Present only indoors
  • D.Removed by wet deposition

Answer: A

Sulphur dioxide from a boiler stack and carbon monoxide from a vehicle exhaust are typical examples. Secondary pollutants such as ozone and much fine particulate form later in the air itself and cannot be traced to a single emission point.

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