The ozone hole near the south pole this year is the smallest since it was discovered, but it is more due to freakish Antarctic weather than efforts to cut down on pollution, NASA reports. - NBCNewsMACH
Chlorine in the air needs cold temperatures in the stratosphere and clouds to convert into a form of the chemical that eats ozone, Newman said. The clouds go away when it warms up.
But this September and October, the southern polar vortex — which just like the northern one is a swirl of cold high-speed winds around the pole — started to break down. At 12 miles high in the atmosphere, temperatures were 29 degrees warmer than average. Winds dropped from a normal 161 mph to about 67 mph , NASA reported.
This is something that happens on occasion, occurring in 1988 and 2002, but not this extreme, Newman said.
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