St. Clair County Real-time Air Quality Index (AQI) & Pollen Report - Air Matters

St. Clair County

Illinois

2026-04-16 17:00

AQI (India)

Moderately polluted

Pollutants|Pollens

O3

μg/m³

109.3

PM10

μg/m³

21.6

PM2.5

μg/m³

6

Weather

26℃

64%

13 kph

8 of 11

Historical Data

Places included

Canteen Township

Caseyville Township

Centreville Township

East St. Louis Township

Fayetteville Township

Freeburg Township

Lebanon Township

Lenzburg Township

Marissa Township

Mascoutah Township

Millstadt Township

New Athens Township

O'Fallon Township

Shiloh Valley Township

Smithton Township

St. Clair Township

Stites Township

Sugar Loaf Township

Data Sources

http://www.airnow.gov/

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