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

 O₂/N₂ ratio _ RYO2012 _ surface - insitu _ AIST _ data1

Updated Date	Version † met : with meteorological data	Details
2024-12-25	0006-2012-7001-01-01-9999 -2025-01-01-0006	The latest version
2023-11-10	0006-2012-7001-01-01-9999 -2023-11-08-0331	Included in Yearly Fixed Dataset 2024