Abstract

Athens is suffering under severe photochemical air pollution levels. The spatial variation of the photosmog characteristics in the Athens basin reveals that air pollution levels in Athens are largely affected by local wind circulation systems. A complete picture of wind field pattern and air pollutant dispersion in Athens can only be achieved with suitable mathematical models. In view of its complexity and its manifold peculiarities, the situation in Athens qualifies as a test case for prognostic mesoscale models and photochemical dispersion models. As the frame of model intercomparisons and of attempts to evaluate model simulation results, the APSIS project was initiated. With the participation of more than 30 scientific teams from four continents, this project is expected to contribute to the refinement of atmospheric environmental software.

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