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The annual NO₂ concentrations in many European cities exceed the established air quality standard. This situation is mainly caused by Diesel cars whose NO_x emissions are higher on the road than during type approval in the laboratory. Moreover, the fraction of NO₂ in the NO_x emissions of modern diesel cars appears to have increased as compared to previous models. In this paper, we assess 1) to which level the distance-specific NO_x emissions of Diesel cars should be reduced to meet established air quality standards and 2) if it would be useful to introduce a complementary NO₂ emissions limit. We develop a NO₂ pollution model that accounts in an analysis of 9 emission scenarios for changes in both, the urban background NO₂ concentrations and the local NO₂ emissions at street level. We apply this model to the city of Antwerp, Belgium. The results suggest that a reduction in NO_x emissions decreases the …