Canada wildfires darken U.S. skies, trigger air quality alerts

Hundreds of wildfires in Canada darkened skies in the U.S. on Wednesday. A big shift in the wind prompted air quality alerts in at least 16 states across the Midwest and Northeast. Tom Hanson reports. "CBS Evening News" delivers the day's most important stories, delivering context and depth to bring greater understanding to your world. Check local listings for "CBS Evening News" broadcast times. Subscribe to the "CBS Evening News" YouTube channel:    / cbseveningnews   Watch full episodes of "CBS Evening News": https://cbsnews.com/evening-news/full... Follow "CBS Evening News" on Instagram:   / cbseveningnews   Like "CBS Evening News" on Facebook:   / cbseveningnews   Follow "CBS Evening News" on X:   / cbseveningnews   Download the CBS News app: https://cbsnews.com/mobile/ Try Paramount+ free: https://paramountplus.com/?ftag=PPM-0... For video licensing inquiries, contact: [email protected]