The Utah Department of Environmental Quality reminds people that January is inversion season. During an inversion cold air is trapped beneath warm air. The stagnated cold air traps pollutants, increasing their concentration giving a hazy, fog like look to the air. The air quality index at 11 a.m. on Tuesday in Tooele County was at the yellow or moderate level, meaning air quality is acceptable, but there may be some risk for people that are unusually sensitive. At the yellow level individuals are asked to voluntarily not use solid fuel burning devices, including wood and coal burning stove and fireplaces, reduce/stop open burning, and TravelWise by consolidating trips. Industry should optimize operations to minimize air pollution emissions. The air quality forecast for Tooele County shows moderate air quality through Thursday.