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Yearly fixed datasets used for WMO GHG Bulletins and WDCGG Data Summaries are available in tgz format. See the data version history.
Unique DOIs are issued for individual yearly fixed archived datasets by WDCGG. The same file name is used for different years.

Updated Date Version Gas Species DOI WMO GHG
Bulletin Volume
Summary Volume
Included data period Details
2021-09-22 06:43:59 the latest version O2/N2 ratio click

These datasets are only available from 2018 onward.