Ground based in situ observations of wet_only_sampler at Westerland (DE0001R). 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: precipitation_amount in precip (lwe_thickness_of_precipitation_amount), PCB_101 in precip (mass_concentration_of_polychlorinated_biphenyl_101_in_precipitation), PCB_118 in precip (mass_concentration_of_polychlorinated_biphenyl_118_in_precipitation), PCB_138 in precip (mass_concentration_of_polychlorinated_biphenyl_138_in_precipitation), PCB_153 in precip (mass_concentration_of_polychlorinated_biphenyl_153_in_precipitation), PCB_180 in precip (mass_concentration_of_polychlorinated_biphenyl_180_in_precipitation), PCB_28 in precip (mass_concentration_of_polychlorinated_biphenyl_28_in_precipitation), PCB_52 in precip (mass_concentration_of_polychlorinated_biphenyl_52_in_precipitation), alpha_HCH in precip (mass_concentration_of_alpha_hexachlorocyclohexane_in_precipitation), benzo_a_pyrene in precip (mass_concentration_of_benzo_a_pyrene_in_precipitation), gamma_HCH in precip (mass_concentration_of_gamma_hexachlorocyclohexane_in_precipitation)