Figure

Maximum ozone hole extent over the southern hemisphere, from 1979 to 2019

Figure Created 09 Dec 2019 Published 04 Feb 2020 Last modified 04 Feb 2020

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Copernicus analyses of total ozone column over the Antarctic. The blue colours indicate lowest ozone columns, while yellow and red indicate higher ozone columns. Ozone columns are commonly measured in Dobson Units. One Dobson Unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimetres thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere. 300 DU corresponds to 3 millimetres of ozone.