(Francisco Kjolseth | Tribune file photo) This Dec. 11, 2017, file photo shows the Salt Lake Valley during a winter inversion that traps polluted air. A new BYU study found that air pollution causes thousands of premature deaths each year in the state and cuts into residents' life expectancy.
Brian Maffly has worked for The Tribune off and on since 1994. Maffly roams Utah, covering public land and environment.