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Here's Where Canadian Wildfires Are Impacting Air Quality in the US

CHICAGO AREA, ILLINOIS, AUG 7 – Smoke from Canadian wildfires and elevated ozone levels have caused a 25% rise in respiratory-related medical visits, prompting an Air Pollution Action Day declaration for the region.

  • On Wednesday, the National Weather Service said the air quality alert has been extended through Thursday for McHenry, Lake, Kane, DuPage, Kendall, Grundy, Cook and Will counties in Illinois and parts of southern Wisconsin.
  • Unhealthy ozone levels also contributed as sunlight mixes with pollutants to raise ozone, and a temperature inversion traps smoke and ozone near the surface, caused by Canadian wildfires.
  • Medical experts warn active children and adults with respiratory conditions to limit outdoor activity and use N95 masks and fresh indoor air filters.
  • On Thursday, the Illinois Environmental Protection Agency declared an Air Pollution Action Day and extended the alert from Wednesday afternoon to midnight Friday.
  • Forecast models suggest strong-to-severe thunderstorms Thursday could break the inversion, potentially improving air quality in the Chicago area.
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Here's where Canadian wildfires are impacting air quality in the US

Breathing in polluted air for extended periods of time can pose a serious health risk for people, especially for vulnerable populations.

·Cincinnati, United States
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NBC Chicago broke the news in Chicago, United States on Wednesday, August 6, 2025.
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