Air quality problems that flared up Friday had drifted away by Monday, said the Utah Division of Air Quality.
"It looks like values are in decline everywhere," said Bo Call, who oversees the state's air-pollution-monitoring network. "The trend is, with the wind and the front coming, [the pollution levels] are declining."
On Friday, as the Saratoga Springs Dump Fire billowed soot into the skies, spikes of both ozone and PM 2.5 registered on monitors up and down the Wasatch Front. At some locations, pollution rose briefly to alarming levels, according to U.S. Environmental Protection Agency standards.