Toxic fog settles over Salt Lake City

The pollution has turned so bad that more than 100 Utah doctors called Jan. 23 on authorities to immediately lower highway speed limits, curb industrial activity and make mass transit free for the rest of winter. Doctors say the microscopic soot — a shower of combustion particles from tailpipe and other emissions — can tax the lungs of even healthy people.

Gallery View:Toxic fog settles over Salt Lake City
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  1. Dr. Gary Kunkel arrives at the Utah State Capitol wearing a breathing mask before a news conference Wednesday, Jan. 23, 2013, in Salt Lake City. A group of doctors is declaring a health emergency over
  2. Utah fog
  3. Utah fog
  4. 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
  5. Utah fog
  6. In this Jan. 9, 2013, photo, an inversion cloud covers downtown Salt Lake City. A group of Utah doctors is declaring a health emergency over the Salt Lake City area
  7. In this Jan. 9, 2013, photo, an inversion cloud covers downtown Salt Lake City. A group of Utah doctors is declaring a health emergency over the Salt Lake City area
  8. In this Jan. 9, 2013, photo, an inversion cloud covers downtown Salt Lake City. A group of Utah doctors is declaring a health emergency over the Salt Lake City area
  9. This Jan. 4, 2013, file photo, shows the haze from an inversion hanging over downtown Salt Lake City. The geography that makes Utah one of the world’s most beautiful places also brings the nation’s di