Ground based in situ observations of low_vol_sampler at Saint-Nazaire-le-Désert (FR0023R). 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: arsenic in pm10 (mass_concentration_of_arsenic_in_pm10_in_air), cadmium in pm10 (mass_concentration_of_cadmium_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)