The Eötvös Loránd University is the reference university in Hungary. As part of the collaboration with RI-URBANS, it can provide 10-year long data sets containing particle number size distributions from 6 to 1000 nm, criteria air pollutants, carbonaceous species and meteorological data for the joint studies. Data on illness and hospital admittance records of the last years can also be provided, together with the interpretation of the scientific outcomes.