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

 HFC-23 _ CMN6042 _ surface - insitu _ AGAGE _ gc-ms

Updated Date	Version † met : with meteorological data	Details
2026-09-02	0004-6042-1502-01-01-2022 -2026-08-10-0037	The latest version