This Report provides a summary of the work conducted in the European Commission 5th Framework project OSCAR (Optimised expert system for Conducting environmental Assessment of urban Road traffic). The overall aim of OSCAR was to deliver an optimised Assessment System to assess the impacts of road traffic on local air pollution, with the capability of identifying suitable impact reduction options for the end user. Information on local air quality and transport policies was reviewed for several European cities. A database of air quality, traffic and meteorological measurements at roadside sites in Athens, Helsinki, London, Madrid and other supplementary cities was developed for model evaluation and for further research. Driving cycles were measured and emissions estimated for congested traffic conditions in the OSCAR cities. The user-orientated Assessment System was then developed through consultation with users. The main features of the System included a modular architecture, a suite of air quality models, input data processing (emissions, traffic and meteorology), scenario analysis tools and visualisation tools. Models were developed for predicting short-term concentrations of NO2, PM10 and PM2.5 pollution levels in street conditions, and an improved description of turbulence and dispersion characteristics was achieved for complex street configurations. In addition, a web version of the OSCAR System was developed. This allows the user access to computational fluid dynamics (CFD) model simulations of complex street geometries for highly detailed analysis of air flows and pollutant concentrations. The OSCAR System was also evaluated at a range of sites.

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