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An ambient air quality standard specifies

  • A.A permissible concentration in the outdoor air people breathe
  • B.The permitted release rate from a chimney
  • C.The efficiency a control device must achieve
  • D.The height at which a stack must discharge

Answer: A

It is expressed as a concentration averaged over a stated period and applies to the general atmosphere rather than to any single source. Emission standards, control efficiencies and stack heights are all means of achieving it rather than the standard itself.

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