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Illinois Air Quality

Current AQI at 40 monitors, highest 65 (Moderate) · Measured 10/26/2026, 1:00 PM PT

Monitors
40
Highest AQI
65
Moderate
Typical (median)
43
Good
Above 100
0

Monitoring sites in Illinois

Worst first. Times are local.

  • 65Granite City Fire StationModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 65PEORIA_JModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 65Wood_RiverModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 63DECATURModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 61BONDVILLEModerate · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 61JERSEYVLModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 58BRAIDWDModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 58CHI_COMModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 58ROCK_ISModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 57East St. LouisModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 57NORMALModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 55Springfield AgModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 54KNIGHT_PModerate · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 52HOUSTONModerate · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 47CHI_WASHGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 45ALSIPGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 45PEORIA_HGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 45QUINCYGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 44NILWOODGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 43EFFINGHMGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 43JolietGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 43THOMASGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 40CHI_SWFPGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 39SPFD_IBGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 37CHI_TAFTGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 37ZIONGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 35StocktonGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 34CARYGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 34DESPLNSGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 34EVANSTONGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 34PEORIA_FGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 33CICEROGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 33LEMONTGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 33NORTHBRKGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 30LISLEGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 29NapervilleGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 27Cicero LibertyGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT
  • 27ROCK_LPGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 27SCHILPRKGood · Ozone · Mon 10/26/2026, 2:00 PM CDT
  • 19CHI_SPGood · Fine particles (PM2.5) · Mon 10/26/2026, 2:00 PM CDT

By county

Highest current AQI among the county's monitors

What the AQI means

  • 0-50Good. Air quality is satisfactory and poses little or no risk.
  • 51-100Moderate. Acceptable. A few unusually sensitive people may have symptoms.
  • 101-150Unhealthy for Sensitive Groups. People with heart or lung disease, older adults, children and teens should limit long or heavy outdoor exertion.
  • 151-200Unhealthy. Everyone may begin to feel effects. Sensitive groups should avoid long or heavy outdoor exertion.
  • 201-300Very Unhealthy. Health alert: the risk of health effects is increased for everyone.
  • 301-500Hazardous. Health warning of emergency conditions. Everyone is more likely to be affected.

Frequently asked questions

Where is the air worst in Illinois right now?
Granite City Fire Station has the highest current reading at AQI 65 (Moderate).
How often are readings updated?
Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Source: EPA AirNow · Last updated 10/26/2026 · Data are preliminary and subject to change