Ground based in situ observations of low_vol_sampler at Kosetice (NOAK) (CZ0003R). 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: calcium in pm25 (mass_concentration_of_calcium_in_pm2p5_in_air), magnesium in pm25 (mass_concentration_of_magnesium_in_pm2p5_in_air), potassium in pm25 (mass_concentration_of_potassium_in_pm2p5_in_air), sodium in pm25 (mass_concentration_of_sodium_in_pm2p5_in_air)