This paper describes a multi-scale modelling approach designed to assess the impact of policy plans at various decision making levels (European, regional and local). The modelling framework is applied for a case study in Antwerp, Belgium. Various tunnel options and traffic management plans for the Antwerp ring road are evaluated with respect to their impact on air quality in 2020 and 2025. The modelling approach takes into account those local action plans as well as regional and European policies for these time horizons. It has been shown that reduction of traffic intensity is one of the most important measures, without which it is unlikely that current European limit values will be attained in the near future at all locations near the Antwerp ring road.
Keywords: urban air quality, EU limit values, local measures, tunnels