The Calculation of Pollution from Road Traffic

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The text on this page is taken from an equivalent page of the IEHIAS-project.

The CAR-International model (Calculation of Pollution from Road Traffic, international version) developed in the Netherlands is a Gaussion-based screening model.

Model description

Purpose

CAR has been developed to estimate air pollution levels around city streets

Boundaries

Field of model: Outdoor Air

Spatial:' Car calculates kerb level estimates

Temporal: Annual percentile values and average concentrations

Pollutants covered: non-reactive pollutants and NO2

Source types of emissions: Traffic only

Input

Annual average traffic density

Vehicle distribution and speed

Emission factors for 4 categories of traffic speed:

  • motorways
  • other roads around city
  • 'normal' city traffic
  • stagnating city traffic

Output

Pollutant concentrations at kerbside (between 5 and 30m away from the road).

Rationale

CAR is a spreadsheet-based model, providing estimates of air pollutant concentrations, primarily on the basis of empirically derived statistical relationships between measured pollution and source/environmental factors. It was initially developed in the Netherlands, where it has been widely tested and used as a screening tool for air quality management purposes. The models were subsequently adapted to provide an 'international version, whuch was designed to be more widely applicable.

References

  • Boeft et al. 1996 CAR International: a simple model to determine city air quality. Sci Tot Env 189/190. 321-326

See also

Integrated Environmental Health Impact Assessment System
IEHIAS is a website developed by two large EU-funded projects Intarese and Heimtsa. The content from the original website was moved to Opasnet.
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