Most other areas of the state also will suffer diminished air-quality levels, though mostly in the orange or yellow (moderate) ranges. That means bans on wood-burning and open fires, along with advisories for residents to avoid prolonged outdoors exposure or unneeded driving.
The National Weather Service noted that a relatively weak storm system would ease the smog somewhat later this week, but the inversions will strengthen again going into the weekend.
The Wasatch Front looked for high temperatures Wednesday in the upper-30s with overnight lows in the upper-teens, unchanged from Tuesday's forecast.
Southern Utahns expected sunny skies and highs around 60 degrees with overnight lows in the low-30s.
The Utah Avalanche Center rated the risk for potentially deadly snowslides at "considerable" in the mountains above Logan and in the Uintas, while Ogden, Salt Lake and Provo were "moderate" and the mountains of Moab at "low."
For more extensive forecast information, visit The Tribune's weather page at http://www.sltrib.com/weather.
Town hall on Utah air quality on Jan. 29
O The Salt Lake Tribune's Jennifer Napier-Pearce will moderate a town-hall discussion on Utah's air-quality challenges with a panel of experts at 7 p.m. Jan. 29 at the Salt Lake City Main Library, 210 E. 400 South.
The discussion will be broadcast live on KCPW 88.3/105.3 FM and at sltrib.com. You can submit questions in advance by sending an email to email@example.com.