It's happened again: scientists discover record breaking ozone hole above the Arctic | Space, Military and Medicine | News.com.au
The hole in the ozone in the Antarctic was caused by human produced chemicals and unusually long winters.[Via Greenie Watch]
The extremely cold conditions trigger a chemical reaction that converts atmospheric chlorine from human-produced chemicals into ozone destroying forms.
The Arctic is usually less affected by ozone loss because it is considerably warmer than the Antarctic.
But researchers found that this year the Arctic cold snap lasted more than 30 days longer than any previously studied winter, causing the rare ozone depletion.
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