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less new CFCs, but the ozone eaters stay in the upper atmosphere for 50 years. http://discovermagazine.com/2007/feb/ozone-hole-worsening
"In early October 2006, the Antarctic stratosphere was the coldest it has been since 1979, and the ozone hole loomed bigger than ever, spanning an area larger than North America. What's going on? ...Chlorine atoms (liberated by the breakdown of chlorine-containing products) convert ozone into molecular oxygen, which provides far less UV protection. A single chlorine atom can tear apart thousands of ozone molecules....Taking a long view, though, the news is good. In the last decade, global ozone levels have stabilized or increased only slightly. All the same, experts estimate that it will take 50 to 70 years for Antarctic ozone levels to get anywhere near pre-1980 levels. And that, of course, depends on continued control of the ozone eaters."
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