Ground based in situ observations of low_vol_sampler at Virolahti III (FI0018R). 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: anthracene in aerosol (mass_concentration_of_anthracene_in_dry_aerosol_particles_in _air), benz_a_anthracene in aerosol (mass_concentration_of_benz_a_anthracene_in_dry_aerosol_particles_in _air), benzo_a_pyrene in aerosol (mass_concentration_of_benzo_a_pyrene_in_dry_aerosol_particles_in _air), benzo_bjk_fluoranthenes in aerosol (mass_concentration_of_benzo_bjk_fluoranthenes_in_dry_aerosol_particles_in _air), benzo_ghi_perylene in aerosol (mass_concentration_of_benzo_ghi_perylene_in_dry_aerosol_particles_in _air), chrysene_triphenylene in aerosol (mass_concentration_of_chrysene_triphenylene_in_dry_aerosol_particles_in _air), dibenzo_ac_ah_anthracenes in aerosol (mass_concentration_of_dibenzo_ac_ah_anthracenes_in_dry_aerosol_particles_in _air), fluoranthene in aerosol (mass_concentration_of_fluoranthene_in_dry_aerosol_particles_in _air), inden_123cd_pyrene in aerosol (mass_concentration_of_inden_123cd_pyrene_in_dry_aerosol_particles_in _air), phenanthrene in aerosol (mass_concentration_of_phenanthrene_in_dry_aerosol_particles_in _air), pyrene in aerosol (mass_concentration_of_pyrene_in_dry_aerosol_particles_in _air)