Protecting the Ozone Layer <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232416/ch02.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (23.0K)</a> This stratospheric ozone “hole” (the purple and black areas) in the region of Antarctica was at its 2006 minimum of 105 DU on September 25th and covered a maximum area of 28.0 million km2. The 2006 hole was almost as large as the record 2000 hole, which peaked at 28.4 million km2. Note: One Dobson unit (DU) corresponds to about one ozone molecule for every billion molecules and atoms present in air.
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