AirWare   On-line Reference Manual

  Release Level 5.4
  Release Date 2008 10
  Revision Level 1.0
Last modified on:   Monday, 20-Jul-09 14:03 CEST

Volatile Organic Compounds

Volatile organic compaounds (VOCs) together with Oxides of Nitrogen (NOx) are the precursors of ozone formation.

Emissions of VOCs is usually from distributed, area sources rather than stacks, and due to evaporation rather than combustion processes. Fugitive VOC emisisons originate from industrial and commercial areas and households (e.g., from chemical production processes, use of points and solvents), and the transportation (fuel) system, including

  • gas stations
  • mobile vehicles
  • stationarty vehicles.
Models that go beyond the city areas may also include biogenic VOC sources.

Basic VOC groups required by the photochemical (ozone) models

  • 3D dynamic model   CAMx
  • Photochemical Box Model   PBM
include:
  • Source emission rate of CO from area and line sources (kg/hour)
  • Source emission rate of CO from point sources (kg/hour)
  • Source emission rate of NOx from area and line sources (kg/hour)
  • Source emission rate of NOx from point sources (kg/hour)
  • Source emission rate of total hydrocarbons (THC) from area and line sources (kg/hour)
  • Source emission rate of total hydrocarbons (THC) from point sources (kg/hour)
  • Source emission rate of hydrocarbon classes from point sources (moles/hour)
  • Source emission rate of hydrocarbon classes from area and line sources (moles/hour)
  • Ratio of NO2/NOx in area and line source NOx emissions
  • Ratio fo NO2/NOx in point source NOx emissions
  • Ratio of CH4/THC in area and line source THC emissions
  • Ratio fo CH4/THC in point source THC emissions
See also:

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