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Why Is the Air Quality Bad Today in Iowa? Air Quality Alert Issued as More Smoke Moves In

NORTH IOWA, JUL 31 – The Iowa Department of Natural Resources issued an Air Quality Alert as fine particulate matter from Canadian wildfire smoke exceeds the 35 µg/m³ health standard, impacting residents.

  • The Iowa Department of Natural Resources warned that wildfire smoke from Northwestern Canada has converged over North Iowa, leading to an Air Quality Alert through Friday.
  • Wildfire smoke carries tiny particles and gases that can be harmful to breathe, drifting from northwestern Canada causing haze over Iowa.
  • Exceedances of the National Ambient Air Quality Standards for fine particulates are expected today and tomorrow over most of Iowa, with levels surpassing 35 micrograms per cubic meter, considered `unhealthy for sensitive groups`.
  • The Iowa Department of Natural Resources recommends sensitive groups such as people with heart or lung disease, older adults, children, teenagers, and outdoor workers avoid long or intense outdoor activity during the Air Quality Alert.
  • Weather experts say the haze will gradually decrease through the weekend, with haze possible on Aug. 2 and air quality improving by Aug. 3.
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KGAN broke the news in on Thursday, July 31, 2025.
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