Wildfire smoke causes poor air quality in Midwest cities.

Hazy smoke from wildfires in Canada has moved into Lake and McHenry counties and the surrounding Chicago area, causing poor air quality. The US Environmental Protection Agency's AirNow reported an air quality index of more than 151, which is considered "unhealthy." Federal officials recommend residents in areas with unhealthy air to keep their activities outside light and short and go indoors if they have symptoms. Those in at-risk groups should consider moving all activities indoors. The National Weather Service says the poor air quality will continue into Tuesday.