2. Methodology
As already stated in the introduction, the evaluation of the air quality control policies undertaken by the different Spanish administrations in the two decades comprised between 2000 and 2020 was carried out fol- lowing the integrated assessment approach of the AERIS model. This section is devoted to explaining the origin and preparation of the neces- sary input data for running the model as well as outlining the method- ologies and criteria for the estimation of impacts and economic benefits, recently incorporated in AERIS.