"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), Global Monitoring Laboratory, NOAA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Japan Meteorological Agency, University of Urbino, Dep. of Pure and Applied Sciences (DISPEA),

Alcide di Sarra (ENEA), Bradley D. Hall (NOAA), Damiano Sferlazzo (ENEA), Debra J. Mondeel (NOAA), Dickon Young (UNIVBRIS), Geoffrey S. Dutton (NOAA), J. David Nance (NOAA), Jgor Arduini (UNIURB), Martin Vollmer (Empa), Michela Maione (UNIURB), Paul Krummel (CSIRO), Ray F. Weiss (SIO), Ray Wang (EAS), SAITO Kazuyuki (JMA), Salvatore Chiavarini (ENEA), Salvatore Piacentino (ENEA), Simon O'Doherty (UNIVBRIS), Stefan Reimann (Empa), Stephen A. Montzka (NOAA), WDCGG; All CCl₄ data contributed to WDCGG by GAW stations and mobiles by 2021-08-13, https://doi.org/10.50849/WDCGG_CCL4_ALL_2021 (Reference date^*: YYYY/MM/DD)

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