This work analyses the improvements in urban air quality for the temporal horizon of the year 2015 by using the WRF-ARW/HERMES/CMAQ modelling system applied with very high resolution (1 km x 1 km and 1 hour) to the north-eastern Iberian Peninsula, focusing on the coastal city of Barcelona (Spain). Several scenarios related to the management of the vehicular mobility and modifications of the vehicular park are defined considering the fleet tendency for the year 2015. These scenarios have been compared to a base case scenario defined for the year 2004 (year of reference in the HERMES emission model). The scenarios plan modifications in the emissions of all sectors, but mainly focus on the technological improvements of the vehicular park, together with modifications in the mobility (re-distribution of the current urban road network into “super-square blocks”, and also changes in the direction of circulation). The results of the air quality modelling system indicate that the strategic management measures, the technological improvements, the use of alternative fuels and the projection of the emissions from different sectors induce a reduction in the average concentrations of atmospheric pollutants in Barcelona downtown, but also in the outskirts and metropolitan area