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)

Associated Press
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)
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)
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