via guardian.co.uk
The glow of sunlight barely permeates the fog to illuminate this view from Clingman’s Dome. Dead fir trees, the result of aphid infestation due to air pollution, are fast becoming a common part of the landscape. The Smoky Mountains, on the border of North Carolina and Tennessee, are at the southern end of the Appalachian Trail. Known for its perennial blanket of smoky-blue mist – a natural effect of oily residues and water vapour from its richly diverse forests – it has become America’s most visited national park, attracting more than 9 million visitors annually. Today, the Great Smoky’s signature blue fog is being replaced by a toxic yellow haze caused by airborne pollutants which are trapped by the mountains
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