Schools across the U.S. East Coast canceled outdoor activities, airline traffic slowed, and millions of Americans were urged to stay indoors Wednesday as smoke from Canadian wildfires drifted south, blanketing cities in thick, yellow haze, Reuters reported. The U.S. National Weather Service issued air quality alerts for virtually the entire Atlantic seaboard.
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![A person wearing a face mask takes a picture of the Manhattan skyline while it's covered in haze and smoke caused by wildfires in Canada, in Brooklyn, New York, June 7, 2023.](https://gdb.voanews.com/01000000-0a00-0242-73db-08db682d830a_w1024_q10_s.jpg)
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A person wearing a face mask takes a picture of the Manhattan skyline while it's covered in haze and smoke caused by wildfires in Canada, in Brooklyn, New York, June 7, 2023.
![Traffic moves along in New York, June 7, 2023, amidst smokey haze from wildfires in Canada. ](https://gdb.voanews.com/01000000-c0a8-0242-3c2d-08db682d69ef_w1024_q10_s.jpg)
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Traffic moves along in New York, June 7, 2023, amidst smokey haze from wildfires in Canada.
![A Man talks on his phone as he looks through the haze at the George Washington Bridge from Fort Lee, New Jersey, June 7, 2023.](https://gdb.voanews.com/01000000-0a00-0242-c387-08db682d74e6_w1024_q10_s.jpg)
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A Man talks on his phone as he looks through the haze at the George Washington Bridge from Fort Lee, New Jersey, June 7, 2023.
![Evening commuters travel on Broad Street past a hazy City Hall, June 7, 2023, in Philadelphia, Pennsylvania. Smoke from Canadian wildfires poured into the U.S. East Coast and Midwest on Wednesday, covering the capitals of both nations in an unhealthy haze, and prompting people to fish out pandemic-era face masks.](https://gdb.voanews.com/01000000-0a00-0242-ec09-08db682d6a48_w1024_q10_s.jpg)
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Evening commuters travel on Broad Street past a hazy City Hall, June 7, 2023, in Philadelphia, Pennsylvania. Smoke from Canadian wildfires poured into the U.S. East Coast and Midwest on Wednesday, covering the capitals of both nations in an unhealthy haze, and prompting people to fish out pandemic-era face masks.