Ground based in situ observations of filter_3pack at Villum Research Station, Station Nord (DK0010G). 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: aluminium in aerosol (mass_concentration_of_aluminium_in_dry_aerosol_particles_in _air), arsenic in aerosol (mass_concentration_of_arsenic_in_dry_aerosol_particles_in _air), chromium in aerosol (mass_concentration_of_chromium_in_dry_aerosol_particles_in _air), copper in aerosol (mass_concentration_of_copper_in_dry_aerosol_particles_in _air), lead in aerosol (mass_concentration_of_lead_in_dry_aerosol_particles_in _air), manganese in aerosol (mass_concentration_of_manganese_in_dry_aerosol_particles_in _air), nickel in aerosol (mass_concentration_of_nickel_in_dry_aerosol_particles_in _air), selenium in aerosol (mass_concentration_of_selenium_in_dry_aerosol_particles_in _air), zinc in aerosol (mass_concentration_of_zinc_in_dry_aerosol_particles_in _air)