On 06-06-2022 access to the 'In situ total column ozone and ozone soundings from 1924 to present from the World Ozone and Ultraviolet Radiation Data Centre' data made available through the Climate Data Store (CDS) was disabled due to a technical issue.
Normal access is now been restored.
We apologise for the inconvenience this is causing in the meantime.
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ECMWF Support