AnnualmeanNO2 concentrationscalculatedaturban scale(OFIS) andtheadditional streetincrementcalculatedatlocalscale(OSPM)forcitiesacrossEuropeinthereference year (2000) and the CLE and MFR scenarios (2030). The dashed line shows the limit value that should apply from 2010 onwards according to Directive 2008/50/EC.