Ozone hole remains size of North America, Nasa data shows

By John Vidal

Antarctic hole in protective layer of gas stands around same level as 2010, 2012 and 2013, but scientists say recovery is on track

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Via: http://www.theguardian.com/environment/2014/oct/31/ozone-hole-layer-remains-size-of-north-america-nasa-data-shows