Furthermore, AERIS was been created to be simple and flexible without sacrificing the quality of the results. Its construction implied using country-specific data provided by national administrations, always working with a fine resolution (16 × 16 km2) which is very necessary when allocating abatement measures (Oxley and ApSimon, 2007 and Moussiopoulos et al., 2009). This resolution can be considered an intermediate step between the continental and the urban scales, which is appropriate for the multi-scalar nesting of models (Oxley et al., 2009). It is also worth noting that the quantification of emissions relied on the use of inventories which were constructed using data referred to the regional and local scales rather than European-scale estimates (i.e. EMEP).