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NewsColony The largest ozone hole ever seen above the Arctic has closed again just weeks after being announced The largest ozone hole ever documented above the North Pole has closed almost as quickly as it formed. The hole formed earlier this year and reached its maximum size in March some 11 miles above the surface of the Earth.   It was the largest ozone hole ever documented over the Arctic, beating the previous record holder, which was observed during the 2011 winter. Scroll down for video  The largest hole ever documented above the Arctic, which was observed in March, has closed against a matter of weeks after it was first made public Researchers with Copernicus’ Atmospheric Monitoring Service believed the hole was caused by an unusually strong polar vortex, which explained its relatively sudden growth, according to a report in CNN . The polar vortex is a high altitude current that circulates in an irregular ring-like pattern around the Arctic and helps ...