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Dobson unit
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==Ozone== NASA uses a baseline value of 220 DU for ozone. This was chosen as the starting point for observations of the Antarctic [[ozone hole]], since values of less than 220 Dobson units were not found before 1979. Also, from direct measurements over Antarctica, a column ozone level of less than 220 Dobson units is a result of the ozone loss from [[chlorine]] and [[bromine]] compounds.<ref>{{cite web |title=Ozone Hole Watch |url=http://ozonewatch.gsfc.nasa.gov/ |publisher=NASA |access-date=2007-10-21}}</ref>
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