Wildfire smoke from Canada and Minnesota has driven high pollution in eastern Pennsylvania already today, and the smoke is expected to grow thicker in the Pittsburgh region as the day goes on.

Katie Blackley

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90.5 WESA

Katie Blackley

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90.5 WESA

Katie Blackley

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90.5 WESA

Wildfire smoke in West Mifflin, Pa.

Wildfire smoke in West Mifflin, Pa.

Kiley Koscinski

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90.5 WESA

Katie Blackley

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90.5 WESA

Allegheny County is under a rare Code Maroon alert — the most severe rating under the U.S. Air Quality Index, signifying "hazardous" conditions — and the entire state is under a Code Purple alert due to smoke from wildfires in Canada and Minnesota.

Niven Sabherwal

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For 90.5 WESA

Allegheny County is under a rare Code Maroon alert — the most severe rating under the U.S. Air Quality Index, signifying “hazardous” conditions — and the entire state is under a Code Purple alert due to smoke from wildfires in Canada and Minnesota.

Katie Blackley

/

90.5 WESA

A Pittsburgh highway with traffic and a smoky background.

Terry O’Reilly

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90.5 WESA