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

 CH₄ _ SMO5009 _ surface - insitu _ NOAA _ ccgg

Updated Date	Version # : used for analysis in the WMO GHG Bulletin (#Volume) † met : with meteorological data	Details
2026-08-26	0002-5009-1002-01-01-3001 -2026-08-12-1013	The latest version