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 pm10 (mass_concentration_of_anthracene_in_pm10_in_air), benz_a_anthracene in pm10 (mass_concentration_of_benz_a_anthracene_in_pm10_in_air), benzo_a_pyrene in pm10 (mass_concentration_of_benzo_a_pyrene_in_pm10_in_air), benzo_bjk_fluoranthenes in pm10 (mass_concentration_of_benzo_bjk_fluoranthenes_in_pm10_in_air), benzo_ghi_perylene in pm10 (mass_concentration_of_benzo_ghi_perylene_in_pm10_in_air), chrysene in pm10 (mass_concentration_of_chrysene_in_pm10_in_air), fluoranthene in pm10 (mass_concentration_of_fluoranthene_in_pm10_in_air), inden_123cd_pyrene in pm10 (mass_concentration_of_inden_123cd_pyrene_in_pm10_in_air), phenanthrene in pm10 (mass_concentration_of_phenanthrene_in_pm10_in_air), pyrene in pm10 (mass_concentration_of_pyrene_in_pm10_in_air)