Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast. Air quality alerts were in effect Tuesday in several states, including Wisconsin,

An air quality alert was issued by the National Weather Service in Mount Holly at 3:47 a.m. on Tuesday, Aug. 5. This warning applies to Delaware, Philadelphia, Western Chester, Eastern Chester, Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks counties.