Antarctic Ozone Hole: 1979 to 2008

In 1979, Antarctic ozone levels dropped below 200 Dobson Units for the first time on record. This threshold became the standard for defining the ozone hole. In 2008, minimum ozone levels dropped to 100 Dobson Units on October 4.

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NASA images courtesy Goddard Space Flight Center Ozone Processing Team.

Published June 2, 2009
Data acquired September 17, 1979 - October 4, 2008

Source:

Aura > OMI