Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

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.

An air quality advisory is in effect for New York City on Monday due to wildfire smoke from Canada, according to officials. Other areas that are affected by the advisory include the Hudson Valley, Adirondacks,