Stay updated with real-time air quality in Chicago, Illinois featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
19
Good
Chicago, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
2.08 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
8.47 μg/m³
0
55
155
255
425
605+
20.48 ppb
0
55
71
86
201
201+
0.30 ppb
0
36
76
186
605
1005+
4.49 ppb
0
54
101
361
1250
2050+
0.19 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Chicago, Illinois
Chicago, Illinois
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AQI 52
Moderate
10.00μg/m³
PM2.5
45.00μg/m³
PM10
51.98ppb
O3
0.37ppb
SO2
2.90ppb
NO2
0.36ppm
CO
AQI 52
Moderate
10.12μg/m³
PM2.5
45.36μg/m³
PM10
51.69ppb
O3
0.38ppb
SO2
2.92ppb
NO2
0.37ppm
CO
AQI 52
Moderate
10.11μg/m³
PM2.5
45.37μg/m³
PM10
50.39ppb
O3
0.38ppb
SO2
2.91ppb
NO2
0.36ppm
CO
AQI 52
Moderate
10.12μg/m³
PM2.5
45.36μg/m³
PM10
50.70ppb
O3
0.38ppb
SO2
2.92ppb
NO2
0.36ppm
CO
AQI 52
Moderate
10.16μg/m³
PM2.5
41.61μg/m³
PM10
48.90ppb
O3
0.40ppb
SO2
2.98ppb
NO2
0.37ppm
CO
AQI 52
Moderate
10.12μg/m³
PM2.5
42.98μg/m³
PM10
50.41ppb
O3
0.39ppb
SO2
2.95ppb
NO2
0.37ppm
CO
Air quality measurements for Illinois, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Chicago, Illinois is updated on an hourly basis.
The worst air quality in Chicago, Illinois was recorded at 11:00:00 on 2025-07-15.
The best air quality in Chicago, Illinois was recorded at 03:00:00 on 2025-07-16.
The real-time air quality index in Chicago, Illinois is 49, currently categorized as Good.
The most common pollutant in Chicago, Illinois is PM2.5.
If the air quality in Chicago, Illinois is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Chicago, Illinois at present are 8.907 μg/m3.
The current PM10 levels in Chicago, Illinois are 39.247 μg/m3.
The current carbon monoxide (CO) level in Chicago, Illinois is 0.364 ppm.
The current sulfur dioxide (SO2) levels in Chicago, Illinois are 0.373 ppb.
The current ozone (O3) levels at Chicago, Illinois is 50.33 ppm.
The current nitrogen dioxide (NO2) levels at Chicago, Illinois is 3.322 ppb.
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