What are "Emission Factors"?

Discussion in 'Atmospheric Emissions & Air Quality' started by Jason Joubert, May 28, 2010.

  1. Jason Joubert

    Jason Joubert Moderator

    An emission factor is a tool used to estimate emissions to the environment, and 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 ton of coal combusted).

    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).

    Emission factor based calculations are a cost effective means to "screen" one's emissions prior to, and in some instances in place of, actual testing.

    The US EPA has published emission factors for numerous activities after decades of investigation.
  2. Jason Joubert

    Jason Joubert Moderator

    Hi Harry,

    Emissions of lead is reduced through government regulation pertaining to the lead content of fuels. Hence our "Unleaded" and "Lead Replacement" (LRP) fuels in SA. Lead is only used as an additive (in some countries) in petrol and not diesel.

    Apex Emission Testing assists emitters of diesel emissions by periodically testing fleets to ascertain if the emissions of each vehicle are within legislated limits. Diesel vehicle testing is addressed in another thread. (http://forum.masterbuilders.co.za/showthread.php?273-Diesel-exhaust-emissions)

    Apex Emission Testing