Decatur, Illinois, USA Air Quality

Monitoring Station · Springfield, United States
59
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
21 2am
33
59
33 5am
32
32
32 8am
32
32
32 11am
32
32
32 2pm
32
33
— 5pm
—
—
— 8pm
—
—
— 11pm
—
—
Station readings
21
59
CAMS model adj +8
24
25
25
25
24
24
24
24
24
24
24
24
24
24
25

Air Quality Forecast (24h)

PM2.515.9 µg/m³ ×1.1 WHO
Moderate
View city history →

Nearby Cities

22 Springfield 36 Mattoon 32 Champaign 32 Urbana 26 Bloomington 26 Normal 36 Charleston 20 Morton 20 Pekin

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-06-09T05:57 UTC.