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

Last modified on:   Sunday, 12-Jul-15 17:50 CEST

Air pollutants

AirWare can represent any number of pollutants, as well as air quality indices such as PSI, as well as the PSI contributions of each of the five pollutants used as the basis for the PSI calculations (PSIP):
the set of pollutants covered is completely open for monitoring data and emissions.

AirWare uses an open list of pollutants. These can be grouped into two distionct classes:

  1. Pollutants emitted (which includes CO2 and VOC, but excludes ozone)

  2. Pollutants modelled (which includes O3, ozone, but excludes CO2 and VOC)
The list of pollutants considered is, in principle, open and defined in a Descriptor in the systems Knowledge Base and can be changed by the system administrator. However, numerous and complex dependences make changing that list nontrivial.

The basic list of pollutants considered in

  • the emisison inventories
  • the emission factors for stationary combustion and road traffic
  • CO, CO2, SO2, NO, NO2, NOx, PM10, PM2.5, VOC

    For the individual models, there are restrictions based on the specific substance behavior and the corresponding model processes.

PSI contributions:
In addition to the PSI index value (based on data over the last 24 hours, the following individual subtance data are available as "individual pollutants" on an hourly, moving average, basis:
  • CO: maximum of the 8-hour-averages of the last 24 hours (in reference to the timestep)
  • O3: maximum of the 1-hour-averages of the last 24 hours (in reference to the timestep)
  • NO2: maximum of the 1-hour-averages of the last 24 hours (in reference to the timestep)
  • SO2: 24-hour-average (ending at the timestep)
  • PM10: 24-hour-average (ending at the timestep)

The basic set of pollutants can be grouped in terms of their behavior:
  1. Physical properties:
    • bouyant, dense/heavier than air (heavy gases, particles);
  2. Chemical properties:
    • conservative
    • first order decay, transformation (e.g., NO=>NO2, SO2=>SO4)
    • complex photochemistry (NOx+VOC=>O3)
Emission inventories for point, area, and line sources should include:
  1. CO2 (for statistical purposes only)
  2. SO2
  3. NOx (or NO/NO2)
  4. CO (for traffic)
  5. PM-10, PM-2.5
  6. Volatile Organic Compounds (VOC), fugitive from area and line sources.

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