Such a model has been developed at the National Environmental Research Institute,

Denmark. In this case the variable scale Atmospheric Chemistry and Deposition

(ACDEP) model is used for the long range transport and dispersion inside the urban

area. The results from this model are used as input to the Operational Street Pollution

Model (OSPM) for dispersion in a single street. OSPM accounts for the chemical

formation of NO2 in the street .

A modelling tool of this kind is necessary to study the result of different control

strategies on both pollution levels and, when coupled to an exposure model, on

population exposure to traffic air pollution.

However, a total assessment of the cost and benefits of the measures to be taken must

be based on integrated social-economic models, which in principles should include all

relevant aspects for the society.


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