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This paper examines to what extent climate change policies will alter the effectiveness of agreed-upon or future policies to reduce regional air pollution in Europe and vice versa. And when is it cost-effective to combat regional air pollution with clean technology instead of add-on technology?For this exercise, several extensions were made to the energy model TIMER, to introduce add-on abatement technologies, specified in terms of costs and reduction potentials, in order to be able to calculate cost-effective emission reduction strategies for different scenarios and regions.The results show that add-on technologies to reduce regional air pollution remain necessary throughout the century. The costs to reach the NOx emission reduction targets in Europe are about three times as high as for SO2. Mitigation costs averaged over the century by add-on technologies can be reduced by climate measures by 50–70% for SO2 and around 50% for NOx. The costs of SO2 and NOx mitigation by add-on technology in a world without climate policy are comparable or in some periods even higher than the costs of an integrated mitigation of SO2, NOx and CO2 emissions if a reduction of specific costs by learning is, in contrast with energy technologies, not assumed for abatement technologies. So, the costs of SO2 and NOx add-on measures avoided by climate policies can outweigh the costs of these climate measures. The total annual costs are in the order of 1 or 2% of the present GDP, depending on the scenario. [Copyright &y& Elsevier]

The aim of this study was to develop consistent scenarios of emissions, climate change and regional air pollution to enable an integrated analysis of the linkage between climate change and regional air pollution in Europe. An integrated modeling framework was developed for this purpose. The framework integrates state-of-the-art models and concepts from the area of climate change and regional air pollution and was supplemented by new modules (e.g. modeling long-term NH3 emissions in Europe, modeling dispersion and transformation of air pollutants under climate change).Consistent climate and air pollution policies were derived, both driven by the desire to achieve certain environmental goals. According to an analysis of scenarios with various combinations of climate and regional air pollution policies the quantitatively most relevant interactions are the effect of climate change policies on the energy mix and the resulting air pollution emissions. In the long-term the global SO2 emissions are expected to decrease (again), accordingly their effect on climate will be minor. Tentatively it can be concluded that for regional air pollution the development of the air pollutant emissions is more important than the effect of climate change on the dispersion and chemical transformation of air pollutants. [Copyright &y& Elsevier]