Ground based in situ observations of filter_1pack at Ispra (IT0004R). These measurements are gathered as a part of the following projects EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ammonium in pm10 (mass_concentration_of_ammonium_in_pm10_in_air), ammonium in pm25 (mass_concentration_of_ammonium_in_pm2p5_in_air), nitrate in pm10 (mass_concentration_of_nitrate_in_pm10_in_air), nitrate in pm25 (mass_concentration_of_nitrate_in_pm2p5_in_air), pm10_mass in pm10 (mass_concentration_of_pm10_ambient_aerosol_particles_in_air), sulphate_total in pm10 (mass_concentration_of_sulphate_total_in_pm10_in_air)