© 2026 ABC News

At least 20 states are under air quality alerts Friday morning.

The smoke is expected to linger for one more day in the East before clearing for the July 4 holiday weekend.

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ABC News
PHOTO: At least 20 U.S. states were under air quality alerts on the morning of June 30, 2023, due to smoke from wildfires in neighboring Canada.
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The thickest smoke on Friday will stretch from the eastern Great Lakes to the Interstate 95 corridor and to parts of the Southeast.

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ABC News
PHOTO: The thickest smoke from Canadian wildfires affecting skies over the United States is forecast to stretch from the eastern Great Lakes to the Interstate 95 travel corridor and down to parts of the Southeast on June 30, 2023.
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By Saturday, skies are forecast to improve, with some light haze lingering for the East Coast.

\"PHOTO:
ABC News
PHOTO: Skies over the United States will be clearer by July 1, 2023, but some light haze from Canadian wildfire smoke could still hang over the East Coast.
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Smoke from the nearly 500 wildfires burning in Canada has been making its way to the U.S. for more than a month after an unprecedented start to the season in which a record 19.5 million acres has already burned. Canada has also broken its record for annual wildfire smoke emissions.

There is no end in sight for the wildfires due to dry conditions and extreme heat in the region.

Some parts of the Midwest measured at the lowest air quality in the world on Tuesday, including regions surrounding Minnesota, according to IQAir.

\"PHOTO:
Joshua A. Bickel/AP
PHOTO: A man tosses a fishing net into the Ohio River as smoke from wildfires is visible over downtown Cincinnati, June 28, 2023.
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Chicago air quality hit the \"very unhealthy\" category on Tuesday as the Air Quality Index soared to 250. Any number over 100 is considered unhealthy for sensitive groups, and 250, or \"Code Purple,\" is considered very unhealthy for all groups.

\"PHOTO:
Kerem Yucel/Minnesota Public Radio via AP
PHOTO: The Minneapolis skyline, seen from the Powderhorn Park, is obscured by wildfire smoke during the air quality alert, June 28, 2023, in Minneapolis.
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Once the AQI reaches 151 and above, breathing the polluted air could cause a host of symptoms -- even in healthy people with no preexisting conditions -- including weakening the immune system and causing damage to the body, including the lungs and heart.

\"PHOTO:
Scott Olson/Getty Images
PHOTO: A lifeguard stands watch along the lakefront as wildfire smoke clouds the skyline on June 28, 2023 in Chicago.
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Exposure to concentrated amounts of PM2.5 can cause short-term effects such as irritation of the eyes, nose and throat; coughing, sneezing and shortness of breath, and long-term effects such as worsening of conditions including asthma and heart disease, according to the U.S. Environmental Protection Agency.

Residents in states with air quality alerts are advised to wear a mask when outdoors limit their time outside, especially for strenuous activity.

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