More Than 800 Canadian Wildfires Source of Hazardous Air Quality Across Midwest

Hazardous air quality readings across Michigan and other Midwest and Northern states are off the charts, and it’s not being caused by explosive diarrhea.

More than 800 wildfires in Canada seem poised to affect more than 115 million Americans across the Midwest, Mid-Atlantic and Northeast through Friday, with smoke and heat causing hazardous conditions to all, not just those with compromising health conditions.

On Thursday morning, Detroit was listed as having the worst air quality in the world, with an AQI reading of 602.

*Current local AQI where Yours Truly lives: 522 — with white haze in overcast skies and distinct smell of smoke

The air was so bad early Thursday in Michigan that Detroit was listed as having the world's worst air quality in the IQAir database. Here's what you need to know.

CBS Detroit (@cbsdetroit.bsky.social) 2026-07-16T13:00:17.371Z

The smoke drifted into Philadelphia and Wilmington, Delaware, during the early hours of Thursday morning and was tracking southward. By Thursday night, the smoke plume accelerates south, engulfing much of Virginia and parts of North Carolina — conditions that are forecast to last through Friday night.

Air quality levels predicted through 2am Saturday:

Greetings from Marquette, Michigan, where the air is usually fresh and clear. Wildfire smog is a glimpse of our future, unless we get serious about protecting our climate.

Barb McQuade (@barbmcquade.bsky.social) 2026-07-16T12:55:27.164Z

Detroit News, WaPo, BBC

Listen to audio transcript
00:00 / 01:06