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An emission standard differs from an ambient standard in that it applies to

  • A.Annual rather than daily averages
  • B.Industry rather than to vehicles
  • C.The source rather than the surrounding air
  • D.Indoor rather than outdoor air

Answer: C

It limits what a chimney, vent or tailpipe may release, usually as a concentration or a mass per unit of production. It is enforceable against an identifiable operator, which is why regulators use it as the working instrument.

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