The new Swiss PM10 model simulates particles from primary PM10 emissions, secondary aerosols from precursor concentrations and regional PM10 components due to emissions from surrounding European countries. The model is implemented in a geographical information system. Results for 1997 of the first model version show that a large area of the Swiss Plateau, with most (sub-)urban locations, have concentration values above the ambient air quality standard of 20 mg m-3. Since mainly the built-up area is concerned, 61% of the inhabitants (4.3 million of persons) live within the area of excessive PM10 pollution levels. The model results are already used as a tool for regional air pollution management. The second version of the model, to be completed in the year 2000, will introduce separate modelling of PM10 and PM25 concentrations, new emission factors for road transport and a revised dispersion model. (A)
Abstract