The domain described by AERIS consists of a grid of 4550 cells of 16 × 16 km, arranged in a grid of 75 × 60 (m × n) cells centred in 40°N and 3°W which covers the entire Iberian Peninsula, and the Balearic Islands as well as Andorra, parts of France, Morocco and Algeria ( Fig. 1). The election of the resolution is usually a result of the compromise between an assumable computational cost (in terms of the hardware infrastructure), the availability of data and their representativeness at that scale. Additionally, analysis at this scale is able to describe approximately emission abatement strategies and air quality changes relevant at mesoscale.