Ground based in situ observations of susp_part_matter at Sniezka (PL0003R) using NA. 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: susp_part_matter in aerosol (mass_concentration_of_suspended_particulate_matter_in_dry_aerosol_particles_in _air)