Chris Detrick | Tribune file photo
A new study indicates Salt Lake County residents drive more on days bad-air notices are in ef
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road a
Keith Johnson | The Salt Lake Tribune
Inversion hangs over Salt Lake City December 11, 2013.
Kim Raff | Tribune file photo
Utah regulators on Wednesday approved a plan to improve the Wasatch Front's wintertime air qualit
Steve Griffin | The Salt Lake Tribune
The Salt Lake City skyline is visible through an inversion that covers the Salt Lake Val
Jeremy Harmon | The Salt Lake Tribune
Salt Lake City's historic Rio Grande station is seen in this view looking west from the i
Francisco Kjolseth | Tribune file photo
A tenacious inversion keeping temperatures below freezing pushed the Salt Lake Valley ai
Chris Detrick | Tribune file photo
Utah regulators on Wednesday approved a plan to improve the Wasatch Front's wintertime air q
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road a
Trent Nelson | The Salt Lake Tribune
The layer of haze over Salt Lake City, seen from 400 South and 1100 East on Wednesday, Janu
Steve Griffin | The Salt Lake Tribune
Red-winged Blackbirds cling to the tops of frost covered reeds on Warm Springs Road and
Steve Griffin | The Salt Lake Tribune
Rice Eccles Stadium, on the University of Utah campus, can be seen through the inversion
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road a
Chris Detrick | Tribune file photo
Inversions like this one in January has earned the corridor from Salt Lake County to Weber Co
Chris Detrick | The Salt Lake Tribune
The inversion as seen from Vista Mound near Ensign Peak Wednesday January 2, 2013.
Chris Detrick | Tribune file photo
A new study indicates Salt Lake County residents drive more on days bad-air notices are in effect, often heading to places like Little Cottonwod Canyon, pictured here during an inversion on Jan. 11, 2011.
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road and 1200 North in Salt Lake City, Utah Wednesday, December 18, 2013. The pond at 700 west and 1200 north was steaming due to the cold temperatures in the valley.
Keith Johnson | The Salt Lake Tribune
Inversion hangs over Salt Lake City December 11, 2013.
Kim Raff | Tribune file photo
Utah regulators on Wednesday approved a plan to improve the Wasatch Front's wintertime air quality. Inversions like this one in February 2013 traps particulate pollution near the ground.
Steve Griffin | The Salt Lake Tribune
The Salt Lake City skyline is visible through an inversion that covers the Salt Lake Valley Friday, January 7, 2011.
Jeremy Harmon | The Salt Lake Tribune
Salt Lake City's historic Rio Grande station is seen in this view looking west from the intersection at 300 S 400 West on Wednesday, Dec. 18, 2013 just as the evening commute starts on a day when the city is cloaked in pollution from an inversion.
Francisco Kjolseth | Tribune file photo
A tenacious inversion keeping temperatures below freezing pushed the Salt Lake Valley air quality into the red for weeks at a time last winter.
Chris Detrick | Tribune file photo
Utah regulators on Wednesday approved a plan to improve the Wasatch Front's wintertime air quality. Inversions like this one in January 2013 traps particulate pollution near the ground.
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road and 1200 North in Salt Lake City, Utah Wednesday, December 18, 2013. The pond at 700 west and 1200 north was steaming due to the cold temperatures in the valley.
Trent Nelson | The Salt Lake Tribune
The layer of haze over Salt Lake City, seen from 400 South and 1100 East on Wednesday, January 23, 2013.
Steve Griffin | The Salt Lake Tribune
Red-winged Blackbirds cling to the tops of frost covered reeds on Warm Springs Road and 1200 North in Salt Lake City, Utah Wednesday, December 18, 2013.
Steve Griffin | The Salt Lake Tribune
Rice Eccles Stadium, on the University of Utah campus, can be seen through the inversion as walkers enjoy clearer air above Eleventh Avenue in Salt Lake City, Utah Monday, December 16, 2013.
Steve Griffin | The Salt Lake Tribune
Ducks can be seen through the steam that rises from a warm spring on Warm Springs Road and 1200 North in Salt Lake City, Utah Wednesday, December 18, 2013. The pond at 700 west and 1200 north was steaming due to the cold temperatures in the valley.
Chris Detrick | Tribune file photo
Inversions like this one in January has earned the corridor from Salt Lake County to Weber County a ranking among the nation's worst spots for air quality from the American Lung Association.
Chris Detrick | The Salt Lake Tribune
The inversion as seen from Vista Mound near Ensign Peak Wednesday January 2, 2013.