Emission factor

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The relationship between the amount of pollution produced and the amount of raw material processed. For example, an emission factor for a blast furnace making iron would be the number of pounds of particulates per ton of raw material. A value that represents the amount of a pollutant released into the Atmosphere via a given process or activity. Emission Factors are specific to the activities and processes that result in the Emissions, and are calculated by considering the intensity of the process (in terms of factors such as the weight and volume of the pollutants, and the duration of the activity) as well as the efficiency of the process.

Links

Clim'Foot: What is an emission factor?
GOV.UK: Government conversion factors for company reporting of greenhouse gas emissions