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

 CH₄ _ AMY2014 _ surface - flask _ NOAA _ ccgg

Updated Date	Version # : used for analysis in the WMO GHG Bulletin (#Volume) † met : with meteorological data	Details
2025-08-21	0002-2014-1002-01-02-3001 -2025-08-18-0749#21	The latest version
2024-12-25	0002-2014-1002-01-02-3001 -2025-01-01-0002
2024-08-30	0002-2014-1002-01-02-3001 -2024-08-01-0821#20	Included in Yearly Fixed Dataset 2024
2023-09-01	0002-2014-1002-01-02-3001 -2023-08-29-1037#19	Included in Yearly Fixed Dataset 2023
2022-08-17	0002-2014-1002-01-02-3001 -2022-08-02-1210	Included in Yearly Fixed Dataset 2022
2021-08-10	0002-2014-1002-01-02-3001 -2021-07-21-1345	Included in Yearly Fixed Dataset 2021
2020-08-13	0002-2014-1002-01-02-3001 -2020-07-31-0900	Included in Yearly Fixed Dataset 2020
2020-03-16	0002-2014-1002-01-02-3001 -2020-03-13-1521
2019-08-30	0002-2014-1002-01-02-3001 -2019-07-31-0735	Included in Yearly Fixed Dataset 2019
2018-10-18	0002-2014-1002-01-02-3001 -2018-10-18-0805	Included in Yearly Fixed Dataset 2018
2018-09-25	0002-2014-1002-01-02-3001 -2018-08-02-1629
2018-06-27	0002-2014-1002-01-02-3001 -2018-03-12-1311