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

 CO₂ _ MKW2022 _ surface - insitu _ AICH _ data1

Updated Date	Version # : used for analysis in the WMO GHG Bulletin (#Volume) † met : with meteorological data	Details
2024-12-17	0005-2022-1001-01-01-9999 -2025-01-01-0005† met	The latest version
2020-02-27	0005-2022-1001-01-01-9999 -2019-11-22-2046† met	Included in Yearly Fixed Dataset 2024
2018-07-30	0005-2022-1001-01-01-9999 -2018-07-17-1502	Included in Yearly Fixed Dataset 2019