Simulation of traffic-induced air pollution on regional to local scales

The model system CARLOS (Chemistry and Atmospheric transport in Regional an d LOcal Scale) has been developed with the aim to simulate atmospheric tran sport and air chemistry on local scales taking into account the influence o f large-scale transport. The system has been applied to a photochemical smo g episode in summer 1997. Multiple nested simulations from the European sca le down to a nest containing mainly the city of Wuppertal, Germany were car ried out. The emission inventory for Wuppertal is based on microscopic traf fic flow simulations. The simulated concentration pattern in Wuppertal is s trongly influenced by local properties like terrain and emission structure as well as by specific regional factors such as urban plumes of cities near by. (C) 2000 Elsevier Science Ltd. All rights reserved.