In this manuscript, we have presented Co, CO2
measurement data from an old radio tower tower (217.5 m) at Beromunster, Switzerland. From about 2 years of continuous CO, CO2
and CH4 measurement at five different heights, we have determined a long-term reproducibility of 2.79 ppb, 0.05 ppm and 0.29 ppb for CO, CO2
, respectively, compliant with the GAW requirements. We have also observed seasonal and diurnal variation of these species.