Ozone hole over Antarctica is 'largest' and 'deepest' it's been in years, researchers say
The ozone hole over Antarctica has grown to its "maximum size" just one year after researchers reported that it was at its smallest since its discovery.
The hole, which occurs annually, grew "rapidly" from mid-August and peaked in early October at about 9.2 million square miles, the World Meteorological Organization announced on Tuesday.
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