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An emission factor expresses

  • A.Emitted mass per unit of activity
  • B.The concentration measured at a monitoring station
  • C.The efficiency of a control device
  • D.The ambient standard for a pollutant

Answer: A

Multiplying the factor by the activity level gives an emission estimate without measuring every source, which is how national inventories are built. Emission factors of this kind carry considerable uncertainty when applied to a different plant from the one measured.

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