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

 CO₂ _ ESP4013 _ surface - flask _ ECCC _ data1

Updated Date	Version # : used for analysis in the WMO GHG Bulletin (#Volume) † met : with meteorological data	Details
2024-12-19	0020-4013-1001-01-02-9999 -2025-01-01-0020	The latest version
2022-09-02	0020-4013-1001-01-02-9999 -2022-08-29-1009	Included in Yearly Fixed Dataset 2024
2021-12-20	0020-4013-1001-01-02-9999 -2021-12-08-1047
2019-09-03	0020-4013-1001-01-02-9999 -2019-09-02-1446	Included in Yearly Fixed Dataset 2021
2018-10-25	0020-4013-1001-01-02-9999 -2018-10-24-0659	Included in Yearly Fixed Dataset 2019
2018-10-23	0020-4013-1001-01-02-9999 -2018-10-19-1633
2018-06-13	0020-4013-1001-01-02-9999 -2018-03-22-1202