The ozone fine structure model: Model concept and options

The Ozone Fine Structure Model (OFIS) model allows an adequate description of urban photochemistry at a very low computational effort. Thus, it may be used for statistical analyses of urban scale ozone levels, including the a ssessment of control strategies and exposure estimates. Recent model extens ions allow taking properly into account emission inhomogeneities in the sur roundings of the considered city and local circulation systems. The perform ance of both the standard and the extended OFIS model versions is illustrat ed by its application to Stuttgart and Athens. The results reveal that the model extensions allow for more versatility in inhomogeneous situations.