An emission factor 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. These factors are usually expressed as the weight of pollutant
divided by a unit weight, volume, distance, or duration of the activity emitting
the pollutant (e. g., kilograms of particulate emitted per megagram of coal burned).
Such factors facilitate estimation of emissions from various sources of air pollution.
In most cases, these factors are simply averages of all available data of acceptable
quality, and are generally assumed to be representative of long-term averages for
all facilities in the source category (i. e., a population average).
Please Note: The use of any emission factor on or derived from this web page
is at the discretion the local air district were the factors will be used. Therefore
it is highly recommended that before any emission factor is utilized that the local
air district be consulted.