Holes in the ozone first began occuring 50 years ago when chemicals capable of destroying it were introduced into the atmosphere through photochemical processes. These chemicals are known as CFCs, halons, and methyl bromide. In most parts of the world, reactions to these chemicals are very slow and there is actually little damage done to the ozone. In Antartica however, there is a very large hole in the ozone layer that opens up every spring and closes by mid-summer.
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