Ground based in situ observations of filter_3pack at Zeppelin mountain (Ny-Ålesund) (NO0042G). These measurements are gathered as a part of the following projects AMAP, CAMP, EMEP, EUSAAR, GAW-WDCA, GAW-WDCRG, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: sulphate_total in aerosol (mass_concentration_of_total_sulphateexpressed_as_sulphur_in_dry_aerosol_particles_in_air), sulphate_total in aerosol (mass_concentration_of_total_sulphateexpressed_as_sulphur_in_dry_aerosol_particles_in_air), sulphur_dioxide in air (mass_concentration_of_sulphur_dioxide_expressed_as_sulphur_in_air)