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Air quality · United States

Illinois Air Quality (AQI) Now

18 Good
European Air Quality Index
PM2.5
1.1µg/m³WHO limit 15
PM10
1.1µg/m³WHO limit 45
NO₂
3.4µg/m³
O₃
55µg/m³
Desert dust
0µg/m³
UV index
0.0
US AQI
39

Updated: · Source: Copernicus CAMS · Open-Meteo

Air quality in Illinois is good right now: European Air Quality Index 18. Fine particulate matter (PM2.5) is 1.1 µg/m³, below the WHO guideline. Fine for all outdoor activities. Pollution is expected to peak around 15:00 over the next 48 hours (index 31, fair).

Illinois 48-hour air quality forecast

09:00: 1609:0010:00: 1611:00: 1712:00: 1813:00: 1814:00: 1815:00: 1815:0016:00: 1817:00: 1918:00: 2019:00: 2120:00: 2121:00: 1921:0022:00: 1923:00: 1900:00: 1901:00: 1902:00: 1903:00: 1803:0004:00: 1805:00: 1606:00: 1507:00: 1408:00: 1509:00: 1609:0010:00: 1811:00: 2112:00: 2413:00: 2714:00: 2915:00: 3115:0016:00: 3117:00: 2718:00: 2219:00: 2220:00: 2521:00: 2821:0022:00: 2923:00: 27

Air quality across Illinois

Cleanest to most polluted.

Frequently asked questions

Is Illinois polluted today?
Air quality in Illinois is good right now: European Air Quality Index 18. Fine for all outdoor activities.
Is it safe to exercise outdoors in Illinois today?
Yes, air quality is good right now; fine for outdoor exercise.
How is the air quality index calculated?
The European Air Quality Index is set by the worst of PM2.5, PM10, nitrogen dioxide, ozone and sulphur dioxide: 0–20 good, 20–40 fair, 40–60 moderate, 60–80 poor, 80–100 very poor, above 100 extremely poor.

Values are Copernicus Atmosphere Monitoring Service (CAMS) model forecasts and may differ from local monitoring stations.

Illinois air quality: details

Pollutants and recent days

Nitrogen dioxide (NO₂) is 3.4 µg/m³ and ozone (O₃) 55 µg/m³; WHO guideline values are 25 (24 h) and 100 µg/m³ (8 h).