Ground based in situ observations of carbon_dioxide at Zeppelin mountain (Ny-Ă…lesund) (NO0042G) using online_crds. These measurements are gathered as a part of the following projects NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: carbon_dioxide in air (mass_fraction_of_carbon_dioxide_in_air), carbon_dioxide in air (mass_fraction_of_carbon_dioxide_in_air)