Ground based in situ observations of online_gc at SIRTA Atmospheric Research Observatory (FR0020R). These measurements are gathered as a part of the following projects ACTRIS and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: 1-2-3-trimethylbenzene in air (mass_fraction_of_123_trimethylbenzene_in_air), 1-2-4-trimethylbenzene in air (mass_fraction_of_124_trimethylbenzene_in_air), 1-3-5-trimethylbenzene in air (mass_fraction_of_135_trimethylbenzene_in_air), 2-2-4-trimethylpentane in air (mass_fraction_of_224_trimethylpentane_in_air), benzene in air (mass_fraction_of_benzene_in_air), ethylbenzene in air (mass_fraction_of_ethylbenzene_in_air), isoprene in air (mass_fraction_of_isoprene_in_air), m-p-xylene in air (mass_fraction_of_m_p_xylene_in_air), n-heptane in air (mass_fraction_of_heptane_in_air), n-octane in air (mass_fraction_of_octane_in_air), o-xylene in air (mass_fraction_of_o_xylene_in_air), toluene in air (mass_fraction_of_toluene_in_air)