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Wildfire smoke leads to air quality alert for northern Illinois

NORTHERN ILLINOIS, JUL 31 – Smoke from Canadian wildfires has caused unhealthy air quality with some areas recording PM2.5 levels as high as 174, prompting health warnings and air pollution action days.

  • On August 1, an air quality alert covering all of Illinois was announced in response to the effects of wildfire smoke.
  • This alert follows widespread wildfire smoke drifting into the region, causing elevated fine particulate pollution harmful to heart and lung health.
  • Air quality index values exceeded 150, reaching unhealthy levels that posed health risks to the general population as well as vulnerable individuals throughout Chicago suburbs and the broader upper Midwest.
  • The National Weather Service recommended that individuals who are physically active, particularly those suffering from respiratory conditions like asthma, reduce the amount of time they spend outside.
  • Officials urged residents to reduce pollution by carpooling, avoiding idling, and rescheduling outdoor activities until air quality improves to protect vulnerable populations.
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NBC Chicago broke the news in Chicago, United States on Thursday, July 31, 2025.
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