Ground based in situ observations of PCB_99 at Birkenes (NO0001R) using bulk_sampler. These measurements are gathered as a part of the following projects CAMP, EMEP, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: PCB_99 in precip (mass_concentration_of_polychlorinated_biphenyl_99_in_precipitation)