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:   Saturday, 18-Jul-15 14:09 CEST
Fleet composition Fleet compositions are named OBJECTS in AirWare. They are specified for all line sources in the overall domain:

A fleet composition OBJECTS consistes of the relative share (number of vehicles) for any user defined set of classes, for example:

  1. Gasoline Passenger cars
  2. Diesel Passenger cars
  3. LPG Passenger cars
  4. Gasoline Light Duty vehicles
  5. Diesel Light Duty vehicles
  6. Heavy Duty vehicles
  7. Urban Busses
  8. Coaches
  9. Motorcycles
  10. Other (new technologies).
The set of vehicle classes is user defined: a Descriptor vehicle_classes in the Knowledge Base contains the list of classes to be considered in the fleet composition and in the emission factor table, which is be kept consistent through a shared Knowledge Base Descriptor definition, but does not guarantee the availability of the vehicle specific emission data.

The fleet composition object consistes of the standard object header and META DATA, and a table of relative shares (in % of vehicles) that should sum to 100%

To edit a fleet composition, click on the percentage string of the desired vehicle class and edit with the edit dialog. Saving the new value will redraw the tabke, and update the pie chart, indicating any undefined (or overdefined) fraction.

Alternative fleet compositions can be selected at the level of emission scenarios.

The fleet composition is global, but several fleet compositions can be defined to be used in alternative scenarios;

To estimate emission from traffic, several components are required:

  1. traffic frequencies (number of vehicles pasing a segment per unit of time)
  2. average speed of traffic (km/hour)
  3. fleet composition.
  4. cold start fraction and road type dependent emission factors for each pollutant considered.

Please note that the vehicl casses selected must match the classes available in the traffic emission factor data base for the correct estimation of traffic generated emissions.

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