Study Group: Good Health and Well-Being Return to Group

Background: Winter temperature inversions—layers of air in which temperature increases with altitude—trap air pollutants and lead to higher pollutant concentrations. Previous studies have evaluated associations between pollutants and emergency department (ED) visits for asthma, but none have considered inversions as independent risk factors for ED visits for asthma.

Objective: We aimed to assess associations between winter inversions and ED visits for asthma in Salt Lake County, Utah.

Methods: We obtained electronic records of ED visits for asthma and data on inversions, weather, and air pollutants for Salt Lake County, Utah, during the winters of 2003 through 2004 to 2007 through 2008. We identified 3,425 ED visits using a primary diagnosis of asthma. We used a time-stratified case-crossover design, and conditional logistic regression models to calculate odds ratios (ORs) and 95% confidence intervals (CIs) to estimate rate ratios of ED visits for asthma in relation to inversions during a 4-day lag period and prolonged inversions. We evaluated interactions between inversions and weather and pollutants.

Results:...

WASATCH VALLEY, Utah– The ugly brown snow that fell over much of Utah last week got everybody’s cars dirty. But it can also have an impact on spring runoff from the Wasatch Mountains.

McKenzie Skiles, an assistant professor of geography at the University of Utah studies the effects of windblown dust and air pollution on winter snowfall. Dust and soot make the snow darker, so it absorbs more sunlight and melts faster, she explained.

Utah’s polluted urban air also includes black soot that colors the...