Ground based in situ observations of high_vol_sampler at Villum Research Station, Station Nord (DK0010G). These measurements are gathered as a part of the following projects CAMP, EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: HCB in air (mass_concentration_of_hexachlorobenzene_in_air), PCB_101 in air (mass_concentration_of_polychlorinated_biphenyl_101_in_air), PCB_114 in air (mass_concentration_of_polychlorinated_biphenyl_114_in_air), PCB_138 in air (mass_concentration_of_polychlorinated_biphenyl_138_in_air), PCB_153 in air (mass_concentration_of_polychlorinated_biphenyl_153_in_air), PCB_170 in air (mass_concentration_of_polychlorinated_biphenyl_170_in_air), PCB_180 in air (mass_concentration_of_polychlorinated_biphenyl_180_in_air), PCB_194 in air (mass_concentration_of_polychlorinated_biphenyl_194_in_air), PCB_206 in air (mass_concentration_of_polychlorinated_biphenyl_206_in_air), PCB_209 in air (mass_concentration_of_polychlorinated_biphenyl_209_in_air), PCB_28 in air (mass_concentration_of_polychlorinated_biphenyl_28_in_air), PCB_3 in air (mass_concentration_of_polychlorinated_biphenyl_3_in_air), PCB_52 in air (mass_concentration_of_polychlorinated_biphenyl_52_in_air), PCB_8 in air