Ground based in situ observations of bulk_sampler at Ulborg (DK0031R). These measurements are gathered as a part of the following projects CAMP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ammonium in precip (mass_concentration_of_ammonium_in_precipitation), arsenic in precip (mass_concentration_of_arsenic_in_precipitation), nitrate in precip (mass_concentration_of_nitrate_in_precipitation)