Maximum historical depletion over the southern hemisphere (9 September 2000) and over the northern hemisphere (15 March 2011)

Figure Created 29 Feb 2016 Published 29 Aug 2016 Last modified 24 Oct 2016, 04:41 PM
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False-colour view of total ozone over the North (Arctic) and South (Antarctic) poles. The purple and blue colours indicate lowest ozone presence, while yellow and red indicate higher ozone presence. Ozone concentration is 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.

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