POLISCOPE
Back to feed
NewsNBC Chicago – LocalJuly 17, 2026United States

Air Quality Alert Extended for Chicago Area Through Saturday Night

The National Weather Service has extended an air quality alert for several Illinois and Indiana counties through Saturday night due to returning wildfire smoke. While rain may provide temporary relief, meteorologists expect smoke levels to increase again by Saturday afternoon and potentially persist into Sunday.

air qualityweatherpublic healthenvironment
Read the full story at NBC Chicago – Local

Why It Matters

Residents in the affected counties face ongoing health risks from poor air quality, which may impact outdoor activities and require sensitive groups to take precautions through the weekend.

Key Facts

  • Air quality alerts are extended through Saturday night for McHenry, Lake, Kane, DuPage, Kendall, Grundy, Cook, and Will counties in Illinois.
  • Air quality alerts for DeKalb and LaSalle counties remain in effect through Friday night.
  • Air quality alerts are extended for Lake, Porter, Newton, and Jasper counties in Indiana.
  • An 'Air Pollution Action Day' is in effect for the Chicago Metropolitan Area through Saturday night, July 18th.
  • A 'Purple Forecast Air Pollution Action Day' (very unhealthy, 201-300 AQI) is in effect until midnight tonight.
  • Wildfire smoke is expected to return Saturday afternoon and evening, potentially thickening on Sunday.
  • Scattered storms are expected Friday and Saturday, with a risk of severe weather south of Interstate 88 on Saturday.
  • Temperatures are expected to drop into the 80s following a period of extreme heat.

Who's Mentioned

personIisha Scott“Meteorologist providing analysis on smoke patterns and storm risks.”organizationIllinois Environmental Protection Agency“Determined the 'Air Pollution Action Day' designation.”organizationNBC 5 Storm Team“Provided meteorological analysis and forecasts.”personAlicia Roman“Meteorologist providing analysis on smoke patterns.”organizationNational Weather Service“Issued and extended the air quality alerts.”locationInterstate 88“Geographic reference point for expected storm activity.”