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

 C¹⁸O₂ _ CHL4004 _ surface - flask _ ECCC _ data1

Updated Date	Version † met : with meteorological data	Details
2024-12-19	0020-4004-1103-01-02-9999 -2025-01-01-0020	The latest version
2021-04-30	0020-4004-1103-01-02-9999 -2021-04-30-1104	Included in Yearly Fixed Dataset 2024
2019-10-15	0020-4004-1103-01-02-9999 -2019-09-30-2318	Included in Yearly Fixed Dataset 2020
2019-09-03	0020-4004-1103-01-02-9999 -2019-09-02-1446	Included in Yearly Fixed Dataset 2019
2018-06-08	0020-4004-1103-01-02-9999 -2018-02-28-1132	Included in Yearly Fixed Dataset 2018