Inversion index: 7 of the most polluted cities in Utah

Utah residents suffer from an increased amount of short-term particle pollution during the winter. Decreased temperatures and increased atmospheric pressure cause polluted air and smog to gather near the ground.

Three Utah cities rank on the American Lung Association list of top short-term particle polluted cities. Out of 15 cities with dangerous air quality indexes, seven are located in Utah. The Deseret News has compiled a list of the top seven polluted cities in Utah based on the air quality index (AQI) from Tuesday, January 8, 2013.

Read more about action days, today's air quality index forecast and understanding and using the air quality index information.