An inversion settled into the valleys along the Wasatch Front the first half of this week, even so much as to delay flights bound for Salt Lake City on Wednesday. 

In 2019, where do Utah counties stand in the state for air pollution? Countyhealthrankings.org ranks each county for this year, used by latest data available from 2014 for this measure, based on the daily density of fine particulate matter (MP2.5). 

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