Emphasis is put on the analysis of critical states in urban traffic systems.
The air chemistry model CBM-IV is dealing with 34 species in 82 reaction equations for simulating the photochemical processes in the lower atmosphere. Air pollution simulations require extremely large amounts of computing time. A message-passing version was developed from the sequential program and implemented on various parallel computers. Greenpeace commissioned an analysis of the influence of emissions caused by traffic in Munich on the ozone concentration in the Munich area. The analysis was performed for a typical mid-summer day in 1994.