© 2026 ABC News

\"PHOTO:
Kylie Cooper/Reuters
PHOTO: A person crosses the street as smoke from Canadian wildfires blankets Washington, July 17, 2026.
>

Philadelphia issued a \"Code Purple Air Quality Emergency Day\" Friday.

\"Everyone may experience negative health effects from particulate matter in the air,\" Philadelphia officials warned. \"Members of sensitive groups may experience more serious health effects.\"

\"PHOTO:
WPVI
PHOTO: The skyline of Philadelphia is shrouded by smoke from wildfires in Canada, July 17, 2026.
>

The worst air quality Friday afternoon is in northern Minnesota and Wisconsin.

In Milwaukee, where the air is in the hazardous category, the Milwaukee Brewers are allowing ticket holders to exchange tickets for Friday night's game for another regular season home game. 

In Cleveland, the Guardians postponed Friday night's home game due to the air quality. The game against the Pittsburgh Pirates will be rescheduled as part of a split double header on Saturday, the team said.

The air is expected to improve on Saturday in the Ohio Valley, Northeast and the Mid-Atlantic, when rain moves in. But parts of the Midwest and Great Lakes will continue to see dangerous air quality.

\"PHOTO:
Julia Demaree Nikhinson/AP Photo
PHOTO: The sun is obscured by wildfire smoke as people run in front of the Washington Monument and Lincoln Memorial Reflecting Pool, July 17, 2026, on the National Mall in Washington.
>

Smoke is probable over New York City on Sunday when Spain plays Argentina in the FIFA World Cup Final at MetLife Stadium in New Jersey, though it is still too early to know exactly where the smoke will be. Sources familiar with the situation told ABC News that \"all involved authorities are monitoring.\"

\"PHOTO:
Gary Hershorn/ABC News
PHOTO: Wildfire smoke from Canada shrouds the sun as it rises behind the skyline of midtown Manhattan and, the Chrysler Building and the Empire State Building in New York City, July 17, 2026.
>
\"PHOTO:
Gary Hershorn/ABC News
PHOTO: Smoke from wildfires in Canada shrouds midtown Manhattan and the Chrysler Building as a man looks out from the 86th-floor observation deck of the Empire State Building, July 16, 2026, in New York City.y
>

Smoke contains fine particles that can travel deep into the lungs. For those who need to work outdoors, are more sensitive to smoke or are in a high-risk group, Kai Chen, an associate professor of epidemiology at Yale School of Public Health, told ABC News that the best type of mask to wear is an N95, which is designed to filter at least 95% of airborne particles.

\"PHOTO:
Jim Lo Scalzo/EPA/Shutterstock
PHOTO: Haze from Canadian wildfires blankets the National Mall in Washington, July 17, 2026.
>

In New York City, Mayor Zohran Mamdani said free KN95 masks are available at hundreds of locations.

Click here to read more on how to stay safe.

ABC News' Michelle Simmons contributed to this report.

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