Utah fog

Utah fog
Smog from an inversion hangs over the Utah State Capitol Wednesday, Jan. 23, 2013, in Salt Lake City. The U.S. Environmental Protection Agency has singled out the greater Salt Lake region as having the nation's worst air for much of January, when an icy fog smothers mountain valleys for days or weeks at a time and traps lung-busting soot. (AP Photo/Rick Bowmer)
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