Wildfire smoke from western US and Canada wafted into the Midwestern US states on Thursday, August 17, CSU/CIRA & NOAA said, with air quality warnings in place near Lake Michigan.Footage released by CSU/CIRA & NOAA shows the smoke drifting west.AirNow, an air quality monitoring agency, issued yellow warnings in several cities on the coast of Lake Michigan and other Midwestern states. Credit: CSU/CIRA & NOAA via Storyful