Ground based in situ observations of benz_a_anthracene at Schauinsland (DE0003R) using wet_only_sampler. 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: benz_a_anthracene in precip (mass_concentration_of_benz_a_anthracene_in_precipitation)