Add Yahoo as a preferred source to see more of our stories on Google. Poor air quality alerts are sweeping across the U.S. again as Canadian wildfire smoke continues to drift south. According to a map ...

Smoke from ongoing wildfires in Canada is creating unhealthy haze across the Midwest. A person rides a bicycle along the shore of Lake Michigan in Chicago as the downtown skyline is blanketed in haze ...

Bad air quality can contribute to bronchitis, particularly if there is pollution from cigarette smoke. Other pollutants in the environment, such as toxic gases and dust, can also increase the risk.