An emission factor (EF) is a quantity of a pollutant emitted relative to an activity metric. It is a representative value that attempts to relate the quantity of a pollutant released to the atmosphere, with an activity associated with the release of that pollutant (USEPA, 1995).
For instance, an EF for the release of NO2 from combustion of coal would be expressed in grams (g) NO2 emitted per kilogram (kg) of coal combusted. EFs are usually expressed as the weight of pollutant divided by a unit weight, volume, distance, or duration of the activity emitting the pollutant.
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