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Large scale exceedances of PM10 and N02 ambient air limit values will continue in Germany despite the implementation of national and international policies. An integrated approach has therefore been developed to assess different cost-effective mitigation strategies for all source groups on a national level. On-road and ofT-road transport emission abatement strategies such as more stringent emission limit values, cost internalisation, speed limits and levelling of fuel taxes can contribute to the overarching goal of an improved air quality.

According to projected and modelled ambient air concentrations, large scale exceedances of PM10 limit values in Germany will continue despite implementation of current national and international legislation. Identification of the causes of these (current and projected) exceedances is crucial to develop successful mitigation options. Furthermore, it is necessary to examine in what way further national abatement measures are able to effectively ensure the PM10 limit values as well as the expected PM2.5 limit values in the near future. This paper presents a method that is suitable to determine the causes for exceedances of PM10 and to identify appropriate and cost efficient abatement measures to reduce the PM10 concentrations in Germany. The contribution from transboundary transported particle precursors as well as the influence of biogenic and natural emission sources are explicitly considered in this methodology. About 100 measures for all considered emission sources and pollutants will be assessed. Nearly 300 concentration scenarios will be calculated and evaluated. The progress of the work is being documented.