Millions across the Midwest and Northeast are under hazardous air quality alerts as smoke from hundreds of Canadian wildfires spreads across the U.S. [▻](http

Millions across the Midwest and Northeast are under hazardous air quality alerts as smoke from hundreds of Canadian wildfires spreads across the U.S. [▻](https://video.twimg.com/amplify_video/2077711588983705600/vid/avc1/1280x720/6amVV-mfc4I4hdql.mp4)