At its peak, the 2003 Southern Hemisphere/Antarctic Ozone Hole (a heavily-researched hole in the ozone layer), which is slightly larger than the one in the Northern Hemisphere, reached an area of 10.9 million square miles, recorded on September 11, 2003. Since then, the hole has gotten smaller due to the balanced content of chlorine in the stratosphere. However variations in temperature and increased human activities may alter the growth of the hole.
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