Smoke from Canadian wildfires has spread across the United States, sending air quality plunging and shrouding skies in a thick brown haze. [▻](https://video.t

Smoke from Canadian wildfires has spread across the United States, sending air quality plunging and shrouding skies in a thick brown haze. [▻](https://video.twimg.com/amplify_video/2078230515723689985/vid/avc1/720x900/bC0oedRq5t9J7kGR.mp4)