Smoke that lingered throughout the Wasatch Front on Sunday night had drifted in from other areas.
This was the explanation from a forecaster with the National Weather Service in Salt Lake City.
"Up and down the whole Wasatch Front, it's kind of smoky," said Pete Wilensky, a lead forecaster with the service.
He named three fires, two in Tooele County and one in Utah County, that he believed were contributing to the situation.
The Dallas Canyon fire in the central portion of the Cedar Mountains in Tooele County, the Radio Tower fire in the north and central portion of Tooele County and a fire southwest of Utah Lake contributed to the haze.
"Between those three, there is a lot of smoke along the Wasatch Front," Wilensky said, noting that winds were blowing smoke into Weber and Davis counties from the south.
Farmington Fire Chief Guido Smith said Sunday's smoky conditions were typical of those seen when fires raged in the southwest.
"This is common from Tooele fires," he said. "They are typically very, very visible during sunset."