Las Vegas remains among the worst U.S. cities for smog, despite fewer unhealthy days of high ozone levels within the past few years, according to an American Lung Association report.
Report: Vegas remains as one of the worst U.S. cities for smog
Las Vegas remains among the worst U.S. cities for smog, despite fewer unhealthy days of high ozone levels within the past few years, according to an American Lung Association report.