air quality assessment & management
Reference and User Manual
AirWare   On-line Reference Manual
  Release Level 7.0
  Revision Level beta
  Release Date 2015 03

Emission factors

Emissions for industrial or commercial activities, primarily combustion related sources are stored in one or more emission factor data bases; Based on emission source characteristics, these values can be used to estimate emission (tier 1,2) from any given source.

The primary Emission Factor data base implements the emission data from the EMEP/EEA inventory guidebook - 2013, see also: EMEP/EEA air pollutant emission inventory guidebook - 2013

    EEA Technical report No 12/2013: Technical guidance to prepare national emission inventories. The joint EMEP/EEA air pollutant emission inventory guidebook supports the reporting of emissions data under the UNECE Convention on Long-range Transboundary Air Pollution (CLRTAP) and the EU National Emission Ceilings Directive. It provides expert guidance on how to compile an atmospheric emissions inventory. The Guidebook is published by the EEA with the CLRTAP Task Force on Emission Inventories and Projections responsible for the technical content of the chapters. The present edition replaces all earlier versions.

The Emission factor data base in AirWare currently holds 399 objects, open for user defined data sets.

Individual emission factor data sets (multiple pollutants by "activity" are tagged with

  • a explanatory generic name
  • the associated NFR code
  • economic sector
  • economic sub-sector.

The data sets can be found efficiently by name (including substrings), or generating sub-sets for Sector or Subsectors, as well as by the NFR code (to filter type the seach string into the window oover the corresponding column in the selector list.

Each data set consiste of the

  • META data (name, META text, owner and modification date;
  • Classification: NFR code, ISIC code, Tier, Economic Sector and Sub-sector, Fuel and technology.
  • Apollutant specific editor, with
    • Substance (from a pre-defined menu/list)
    • a data filed for the emission factor (value)
    • and a unit, of the form: POLLUTANT unit / FUEL unit
    A button" add will add the data triple to the table "Factors by Pollutant".

The ADD an entire new data set, use the new button at the class selector/listing level.


  • The set of fuel types the system uses and offers as choices for editing with each emission source is defined as a set of values for a Descriptor fuel_type in the Knowledge Base; the user can add or delete fuel types as required;
  • The set of pollutants considered is driven by the descriptor emission_pollutant,
    and can be changed in the Knowledgebase. The current default set includes:

    • CO, CO2, NO, NOx, NO2, SO2, PM10, PM2.5, VOC, plus in addition: As, Cd, CH4, Cr, Cu, Hg, Ni, NH3, NMVOC, PCB, Pb, Se, Zn, TSP.
    Database:       AIR
    Table:          EMISSION_FACTOR
    ID            int(10) unsigned
    DESCRIPTOR    varchar(64)
    VALUE         varchar(255)
    primary key   (ID, DESCRIPTOR)
    Valid descriptor/ value pairs are:
    OWNER=Text (=username)

    The Emission Estimation Strategy

    The basic emission estimates are implemented as follows: the emission factor defines the amount of pollutant generated (in g) from one unit of "activity" like burning one unit of fuel. This is then converted to the required emission unit of g/s by correcting for the number of seconds in a year and the annual fuel consuption data values.

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