Sickening, lung-busting fog settles over Salt Lake City

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Toxic Fog Utah
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Toxic Fog Utah
A poor air quality warning is posted over a highway Wednesday, Jan. 23, 2013, in Salt Lake City. A group of doctors is declaring a health emergency over northern Utah's lingering pollution problem. Utah Physicians for a Healthy Environment planned to deliver a petition Wednesday demanding immediate action by elected officials. (AP Photo/Rick Bowmer)