Salt Lake City and Logan are surrounded by mountains, which can trap pollution and create some of the worst air quality in the nation, particularly in winter. Red Alert action days happen several times a year (often for more than a week at a time) when strenuous activity, particularly by young and elderly people, is discouraged. Visit the Utah Department of Environmental Quality website to find out about air quality if you have asthma, allergies, or other breathing sensitivities.
Utah Department of Environmental Quality. www.airquality.utah.gov.