Source: Mickey Ashmore 5. Linkages to other FoA/CCCs Preliminary Results Methodology Context -A detailed understanding of the distribution and behavior of pollutants in the air is a prerequisite for studies on the health impact of contaminated air. -Air quality data from monitoring stations is usually not representative for the concentration of contaminants within a larger (three-dimensional) area. -Common air quality models operate on a broad scale, with distances measured in kilometers. While

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... this approach works very well for regional (meso-scale) air pollution modeling, it is not suitable to estimate levels of contaminants within the urban system (micro-scale). -As traffic emissions account for an immense share of contaminants, their dispersion in the air is the most relevant of processes on the micro-scale to be considered when modeling urban air quality. Objective and research questions -The objective is to develop a modeling chain, starting with the simulation of the dispersion of traffic emissions within a street canyon and reaching up to modeling meteorology and air chemistry for grid cells of 3km by 3km. -How can I integrate models across scales? More specifically, how do chemical processes occurring on the micro-scale relate to those taken into account on the mesoscale? micro-scale meso-scale Traffic emission model GRAL Air quality model