© 2026 ABC News

The worst air quality in the world Tuesday morning was in Wisconsin.

The state's Department of Natural Resources issued a statewide air quality advisory that's in effect until Thursday.

\"PHOTO:
Mike De Sisti/Milwaukee Journal Sentinel via USAToday Network
PHOTO: A haze of smoke hovers in the air of Milwaukee at Veteran's Park, June 27, 2023.
>

On Tuesday afternoon the AQI in Milwaukee registered in the \"very unhealthy\" category.

\"The most significant air quality and health impacts are anticipated between noon on Tuesday, 6/27 and noon on Wednesday, 6/28,\" Wisconsin's Department of Natural Resources said. \"This is a dynamic situation, and conditions may change rapidly over the next few days. It is important to pay close attention to the air quality in your area and take action, especially if you don’t feel well.\"

REMINDER: The DNR has issued a statewide multi-day air quality advisory due to another round of smoke from Canadian wildfires. The current advisory is in effect through noon on Thursday, 6/29. (1/5) pic.twitter.com/iISBCsas9t

— Wisconsin DNR (@WDNR) June 27, 2023

The air quality is at a very unhealthy level due to wildfire smoke in Canada. We are advising that everyone stay inside and avoid all outdoor activities.

Read more on the advisory here https://t.co/XNzuFgE9yO, and stay updated at https://t.co/3UryedE1P3.

Stay safe, #Milwaukee! pic.twitter.com/UyJYLQNZct

— City of Milwaukee Health Department (@MKEhealth) June 27, 2023

By Tuesday evening the densest smoke will be in cities including Springfield, Illinois; Peoria, Illinois; Louisville, Kentucky and Roanoke, Virginia.

Downtown Indy not visible from our camera at the Indianapolis Motor Speedway. We all see the smoke. Can you smell it? I can't. pic.twitter.com/EzdFqiygmW

— Kevin Gregory (@KevinGWRTV) June 27, 2023
\"PHOTO:
ABC news
PHOTO: Wildfire Smoke Forecast, Tues. 8PM
>

On Wednesday morning, the haze will be noticeable from Iowa to North Carolina. The smoke is forecast to be strongest in cities near Cedar Rapids, Iowa, and St. Louis, Missouri.

\"PHOTO:
ABC News
PHOTO: Wildfire Smoke Forecast, Wed. 7AM
>

On Wednesday afternoon, the smoke will start to weaken slightly but reduced air quality is still expected from Minnesota to North Carolina.

Even the Northeast could see an impact. New York City Mayor Eric Adams warned that New Yorkers could experience worse air quality on Wednesday and New York Gov. Kathy Hochul said air quality health advisories have been issued for several upstate New York regions.

\"PHOTO:
ABC News
PHOTO: Wildfire Smoke Forecast, Wed. 2PM
>

The smoke is expected to lessen significantly Wednesday night into Thursday. A milky sky is still expected from Michigan to Georgia and those with asthma and other respiratory issues may still have difficulty breathing.

The smoke is forecast to clear on Friday when showers and thunderstorms hit the region.

Earlier this month the Canadian wildfire smoke drifted toward the Northeast, blanketing New York City, Philadelphia and Washington, D.C., in a dangerous orange haze and prompting serious air quality alerts in over a dozen states. On June 7 New York City's AQI hit 484, the highest level on record.

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ABC News Photo Illustration
PHOTO: Air Quality Index (AQI)
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