Ground based in situ observations of filter_2pack at Lista (NO0099R). These measurements are gathered as a part of the following projects EMEP, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: arsenic in pm10_pm25 (mass_concentration_of_arsenic_in_pm10_minus_pm2p5_in_air), cadmium in pm10_pm25 (mass_concentration_of_cadmium_in_pm10_minus_pm2p5_in_air)