(The Hill) — Parts of the Midwest and Northeast are experiencing poor air quality Monday as smoke from Canadian wildfires drifts into the U.S.

The National Oceanic and Atmospheric Administration (NOAA) said Monday in a social media post that “#Smoke from Canadian #wildfires is continuing to bring #AirQuality Alerts to parts of the Upper Midwest and Northeast today.”

“There is also a #SlightRisk of severe #thunderstorms across parts of the High Plains this afternoon,” NOAA added.

The government’s AirNow Fire and Smoke Map showed unhealthy air quality in cities including Milwaukee and Buffalo, N.Y., and parts of Detroit as of Monday morning. 

Other cities, including Grand Rapids and Lansing in Michigan and Cleveland, Ohio, were listed as having air quality that was unhealthy for sensitive groups. 

Several states were under air quality advisories on Monday morning. 

The Canadian Interagency Forest Fire Centre listed 743 active fires on Monday morning, including 298 that were considered out of control.