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

 ¹⁴CO₂ _ ARH7009 _ surface - flask _ GNS _ data1

Updated Date	Version † met : with meteorological data	Details
2025-06-10	0120-7009-6001-01-02-9999 -2025-05-27-0029	The latest version