This dataset is operationally produced by the atmospheric dispersion models applied in ICARUS and contains data stored in two main subfolders as follows: 1) Folder “Air quality data of Representative days” which includes air quality data for the Representative days (RD) which were estimated by the EUROCORDEX climate data. This data has been derived from the application of a nesting approach at the urban scale of the Eulerian WRF/WRF-Chem model in the 9 pilot cities addressed in ICARUS i.e. Thessaloniki, Athens, Roskilde/Copenhagen, Basel, Brno, Milan, Madrid, Ljubljana and Stuttgart. On the urban scale, nine (9) nests with dimensions 2x2km have been used consisting of 42x42 grid cells each. Daily concentrations were produced and stored for NO2, O3, PM10, PM2.5. Data are stored in various subfolders named according to the city to which they are referring to and in further subfolders named according to the policy/measure assessed. Within these subfolders the filename convention is the following: Domain/date of the RD. 2) The “GHG” folder which includes GHGs (CO2 and CH4) concentration data calculated for each ICARUS city under the BaU emission scenario. The filename conventions is the following: Cityname.csv