An Interscale Approach to Assess No2 and Ozone Levels in Urban Areas

Abstract

Urban air quality depends on both regional and local scale transport and transformation phenomena. Therefore an interscale approach is needed for reliable assessments of air pollution levels in conurbations. Microscale models taking into account chemical processes can provide mesoscale models with more accurate emission data. This is demonstrated by the aid of simulations with a CFD model. Furthermore, a suitable combination of a regional and local scale photochemical model is needed for properly describing ozone formation at the urban scale. An efficient combination of that type is proposed which may be used for reliable assessments of longer term air pollution levels and the effectiveness of control strategies.