Air quality is expected to start degrading in northern Utah with the weekend's "green" conditions changing to "yellow" Monday for Salt Lake, Davis, Cache, Utah and Weber counties.
The Utah Division of Air Quality predicts Tooele and Box Elder counties' air quality will maintain a green rating Monday.
A cold front moving through on Monday night should clear out inversion-related pollution in the valleys of northern Utah, and could also bring a little bit of snow, according to the National Weather Service.
Temperatures aren't expected to dip as low as they did last week, however, when a mass of arctic air moved through, said Pete Wilensky, lead forecaster with the National Weather Service. It will likely be in the mid-40s Sunday and Monday, dropping to the 30s on Tuesday, he said.
The front could also bring a couple of inches of snow to the valleys of northern Utah, and between 6 and 12 inches of snow to the mountains, Wilensky said. High winds may pick up at higher altitudes.
The mercury will begin to rise again late Wednesday, up to the low 40s by the end of the week, but that could also mean an inversion settling into the valleys again, Wilensky said.