The WRF-ARW/HERMES-EMEP/CMAQ/BSC-DREAM8b modelling system provides high resolution air quality predictions for 48h in Europe –EU12- (12x12 km2, 1h), the Iberian Peninsula and Balearic Islands –IP4- (4x4 km2, 1h) and Canary Islands –CAN2- (2x2 km2, 1h) since July 2007, under the framework of the CALIOPE project (Baldasano et al., 2008; http://www.bsc.es/caliope/). A near real time evaluation system has been developed and it is on-line and in operation since January, 2009. Non validated near real time air quality data from more than 400 surface stations are compared to ground-concentration predictions in Spain. Seven ozonosondes are used to test the performance of the model in reproducing O3 vertical structures in Europe, Spain and Canary Islands. Additionally, OMI images are used to qualitatively assess the vertical column densities of NO2 predicted for Europe.Postprint (published version
