Michelle Francis keeps one eye on Utah's air quality index and the other on her 9-year-old daughter's chronic asthma these days. The air pollution is so awful in her Salt Lake City suburb that Francis keeps her daughter indoors on many days to prevent her cough from being aggravated. "When you add all the gunk in the air, it's too much," Francis said. The U.S. Environmental Protection Agency has singled out the greater Salt Lake region as having the nation's worst air for much of...
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