The OFIS model: an efficient tool for assessing ozone exposure and evaluating air pollution abatement strategies

The Ozone Fine Structure (OFIS) model describes transport and chemical tran sformation processes in an urban plume at very low computational effort. Th is newly developed Eulerian model may be used for calculating ozone levels for individual situations as well as for deriving ozone exceedance statisti cs based on large-scale meteorological and long-range transport information over a longer time period. Results are presented from the application of t he OFIS model to Stuttgart for the period April to September 1990. Compared to measurements, OFIS satisfactorily describes both the absolute maximum o zone values and cumulative AOT60 values in the area of interest. Results of the OFIS model allow conclusions regarding the influence of assumed ozone emission reductions on the urban scale to be drawn.