"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."

Advanced Global Atmospheric Gases Experiment Science Team(AGAGE), Atmospheric Chemistry Research Group School of Chemistry University of Bristol, Global Monitoring Laboratory, NOAA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, University of Urbino, Dep. of Pure and Applied Sciences (DISPEA),

Bradley D. Hall (NOAA), Chris Lunder (NILU), Damiano Sferlazzo (ENEA), Daniel Say (UNIVBRIS), Dickon Young (UNIVBRIS), Geoffrey S. Dutton (NOAA), James W. Elkins (NOAA), Jgor Arduini (UNIURB), Martin Vollmer (Empa), Michela Maione (UNIURB), Paul Krummel (CSIRO), Ray F. Weiss (SIO), Ray Wang (EAS), Salvatore Chiavarini (ENEA), Simon O'Doherty (UNIVBRIS), Stefan Reimann (Empa), Stephen A. Montzka (NOAA), WDCGG; All CH₃Cl data contributed to WDCGG by GAW stations and mobiles by 2020-09-02, https://doi.org/10.50849/WDCGG_CH3CL_ALL_2020 (Reference date^*: YYYY/MM/DD)

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