Ground based in situ observations of filter_1pack at Knokke (BE0004R). 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: cadmium in pm10 (mass_concentration_of_cadmium_in_pm10_in_air), copper in pm10 (mass_concentration_of_copper_in_pm10_in_air), lead in pm10 (mass_concentration_of_lead_in_pm10_in_air), nickel in pm10 (mass_concentration_of_nickel_in_pm10_in_air), zinc in pm10 (mass_concentration_of_zinc_in_pm10_in_air)