New York Times: Utah has long been known as an outdoor lovers utopia. The skiing and mountain biking are among the best anywhere. And the snow-clotted mountains that tower around Salt Lake give this city a mythic quality during winter. But lately, the Wasatch Front, the corridor of cities and towns where most Utahans live, has acquired a reputation for a less enviable attribute: bad air. For the last few years, the area has been grappling with one of the nations most vexing pollution problems, where atmospheric...