The DYMOS system and its application to urban areas

During hot mid-summer periods, high concentrations of surface-near ozone arise in many urban and industrial areas all around the world. In Germany, federal authorities are bound by law to protect the public from the exceeding of health-critical concentrations, e.g. by imposing a national driving ban for cars without emission reduction. In order to support governmental administrations and industry responsible for air pollution management, complex air pollution simulation systems are necessary. DYMOS is a parallelly implemented air pollution simulation system for mesoscale applications, consisting of different meteorological models, an air–chemistry model, a database, and a graphic user–interface. Using the DYMOS system, various case studies in urban areas have been carried out or are in preparation (e.g. in the regions of Berlin, Munich, Budapest, Gdansk, Athens, Sao Paulo). This paper concentrates on the application of REGOZON, a subsystem of DYMOS, in two densely populated areas (Berlin, Munich) in Germany. On the behalf of the Senate of Berlin and the Ministry of Environmental Protection of Brandenburg, a measuring campaign in 1994 of ozone and ozone precursor substances in the region Berlin–Brandenburg was accompanied by computer simulations with REGOZON. Commissioned by Greenpeace, the influence of emissions caused by traffic in Munich on the ozone concentration in the larger Munich region was analyzed for a typical mid-summer day in 1994