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

 HFC-134a _ TOB6412 _ surface - insitu _ AGAGE _ gc-ms-medusa

Updated Date	Version † met : with meteorological data	Details
2025-08-18	0004-6412-1508-01-01-2023 -2025-08-12-1508	The latest version