Heavy metals at Villum Research Station, Station Nord. 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: arsenic in aerosol (mass_concentration_of_arsenic_in_dry_aerosol_particles_in_air), cadmium in aerosol (mass_concentration_of_cadmium_in_dry_aerosol_particles_in_air), lead in aerosol (mass_concentration_of_lead_in_dry_aerosol_particles_in_air), nickel in aerosol (mass_concentration_of_nickel_in_dry_aerosol_particles_in_air)