Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.Jump to contentThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged inAllNewsSportCultureLifestyleMillions of Americans could see hazy, yellow skies and worsening air quality over the next few days as smoke from hundreds of wildfires burning across Canada spreads across the Midwest, Great Lakes and Northeast.Wildfire smoke from over 830 active fires in Canada is spreading across the US, potentially affecting around 100 million Americans in the Midwest, Great Lakes, and Northeast. The smoke will first impact the Upper Midwest before moving east, bringing hazy skies and reduced air quality to major cities including New York City, Boston, Philadelphia, Detroit, and Washington D.C. Parts of the Upper Midwest could experience "Mars-like" skies and air quality deemed unhealthy for all residents, prompting air quality alerts across several states. Health officials recommend precautions such as limiting outdoor activity, keeping windows closed, and using KN95 masks, with relief from rain expected later in the week. In fullCanada wildfire smoke to spread across the US - here’s what to expectMore bulletinsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in

Over 800 wildfires are burning through forests in Canada, prompting heavy smoke warnings for millions of Americans.

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

A massive plume of smoke from wildfires burning across Canada has swept into the United States, degrading air quality across the Midwest, Northeast and Mid-Atlantic.

Residents have been warned to stay indoors to avoid both the smoke and the extreme heat