Ground based in situ observations of steel_canister 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: 2-2-4-trimethylpentane in air (mass_fraction_of_224_trimethylpentane_in_air), n-octane in air (mass_fraction_of_octane_in_air)