See the data version history.
The data of old versions are available only if the versions are included in Yearly fixed datasets.

 CO₂ _ MGK5058 _ surface - insitu _ ESNZ _ data1

Updated Date	Version # : used for analysis in the WMO GHG Bulletin (#Volume) † met : with meteorological data	Details
2026-07-22	0057-5058-1001-01-01-9999 -2026-07-21-0910	The latest version
2025-07-29	0057-5058-1001-01-01-9999 -2025-07-18-0356#21	Included in Yearly Fixed Dataset 2025