Ground based in situ observations of mercury_GEM at Villum Research Station, Station Nord (DK0010G) using Hg_mon. These measurements are gathered as a part of the following projects AMAP, EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: mercury_GEM in air (mass_concentration_of_gaseous_elemental_mercury_in_air)