"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

Global Monitoring Laboratory, NOAA, National Institute of Water & Atmospheric Research Ltd., National Physical Laboratory, Tohoku University,

Chris Rennick (NPL), Dafina Kikaj (NPL), Edward Chung (NPL), Emmal Safi (NPL), Gordon Brailsford (NIWA), Reid Clark (INSTAAR), Ryo Fujita (MRI), Shinji Morimoto (TU), Sylvia Michel (INSTAAR), Sylvia Nichol (NIWA), Taku Umezawa (NIES), WDCGG; All ¹³CH₄ data contributed to WDCGG by GAW stations and mobiles by 2025-09-10, (Reference date^*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.