FASST(R) is a source receptor model, an R version of the reduced-form TM5- FASST [5] model developed at JRC-Ispra, to compute the annual concentrations of several pollutants p, namely SO2 , NOx , fine Particulate Matter (PM2.5 ) and O3. The FASST(R) model produces concentrations on a world spatial grid of resolution of 1 ◦ × 1 ◦ , and the fine PM 2.5 concentrations include Particulate Organic Matter (POM), secondary inorganic PM, dust and sea-salt.