How much longer will Canadian wildfire smoke affect the Northern US?

Canadian wildfires are ongoing, with 876 active fires across Ontario, burning since early July. Smoke from the fires has invaded the U.S., causing hazardous air quality in over 130 million Americans, especially impacting Michigan, northern states, and major cities including New York and Chicago. The smoke is expected to linger until wind shifts later this week, with authorities warning of continued poor air conditions amid heat waves.

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