Cherokees called the magnificent mountain range in eastern Tennessee "land ofthe blue mist," which European settlers later changed to "Smoky Mountains."Today, the Great Smoky Mountains National Park is one of SouthernAppalachia's leading tourist attractions. But that fabled blue mist isn't so blue-- orhealthy-- any longer. Particularly in the summer months, the "smoke" of the Smokies isa haze of sulfate particles and other pollutants released by coal-burning...