Canadian wildfires blanket eastern U.S. with smoke, causing poor air quality for millions

Hundreds of wildfires continue to burn across Canada and many of them are out of control. The smoke is putting millions of Americans under air quality alerts, prompting warnings to stay indoors to avoid exposure to pollution. Stephanie Sy reports. Stream your PBS favorites with the PBS app: Find more from PBS NewsHour at Subscribe to our YouTube channel: Follow us: TikTok: @pbsnews Twitter: Instagram: Facebook: Subscribe: PBS NewsHour podcasts: Newsletters: