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Inversion smog lies near the Pancir hill in the Sumava mountains on... News PhotoCzech Republic,Environmental Damage,Environmental Issues,Hill,Horizontal,Mountain,Mountain Range,Outdoors,Smog,WeatherPhotographer Collection: Getty Images News 2012 isifaPANCIR, CZECH REPUBLIC - NOVEMBER 21: Inversion smog lies near the Pancir hill in the Sumava mountains on November 21, 2012 in Pancir, Czech Republic. An inversion occurs when a layer of warmer air lies at a higher altitude, which can trap smog close to the ground. (Photo by Ladislav Nemec/MAFRA/isifa/Getty Images)