Ground based in situ observations of organic_carbon at Birkenes II (NO0002R) using low_vol_sampler. These measurements are gathered as a part of the following projects ACTRIS, EMEP, GAW-WDCA, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: organic_carbon in pm25 (mass_concentration_of_organic_carbon_in_pm2p5_in_air)