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
2026-07-22	0120-7009-6001-01-02-9999 -2026-07-21-0851	The latest version
2025-07-22	0120-7009-6001-01-02-9999 -2025-07-22-1122	Included in Yearly Fixed Dataset 2025
2025-06-10	0120-7009-6001-01-02-9999 -2025-05-27-0029