Arctic ozone hole expands rapidly
October 11th, 2011
A huge hole which appeared in the ozone layer above the Arctic is the largest recorded in the Northern Hemisphere, triggering worries the event could occur again and be even worse.
Since the 1980s, scientists have recorded an ozone hole every summer above the Antarctic at the bottom of the globe.
A matching hole above the Arctic was always much smaller, until March this year, when a combination of powerful wind patterns and intense cold high in the atmosphere created the right conditions for ozone-eating chlorine chemicals to damage the layer.
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