Stay updated with real-time air quality in Granite City, 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)
33
Good
Granite City, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.99 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
22.10 μg/m³
0
55
155
255
425
605+
29.22 ppb
0
55
71
86
201
201+
0.66 ppb
0
36
76
186
605
1005+
5.58 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Granite City, Illinois
Granite City, Illinois
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AQI 27
Good
5.41μg/m³
PM2.5
18.86μg/m³
PM10
29.25ppb
O3
0.65ppb
SO2
5.49ppb
NO2
0.18ppm
CO
AQI 33
Good
5.78μg/m³
PM2.5
24.84μg/m³
PM10
26.07ppb
O3
0.65ppb
SO2
5.49ppb
NO2
0.17ppm
CO
AQI 26
Good
4.39μg/m³
PM2.5
17.99μg/m³
PM10
28.32ppb
O3
0.62ppb
SO2
5.76ppb
NO2
0.19ppm
CO
AQI 26
Good
4.14μg/m³
PM2.5
17.55μg/m³
PM10
27.95ppb
O3
0.64ppb
SO2
5.87ppb
NO2
0.16ppm
CO
AQI 33
Good
5.98μg/m³
PM2.5
21.42μg/m³
PM10
29.45ppb
O3
0.70ppb
SO2
4.94ppb
NO2
0.16ppm
CO
AQI 26
Good
3.92μg/m³
PM2.5
15.55μg/m³
PM10
27.74ppb
O3
0.65ppb
SO2
5.60ppb
NO2
0.15ppm
CO
Air quality and pollutant data for Illinois, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Granite City, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Granite City, Illinois was at its worst at 02:00:00 on 2026-09-06.
In the last 24 hours, the best air quality in Granite City, Illinois was observed at 04:00:00 on 2026-09-07.
As of now, the AQI in Granite City, Illinois is 33, indicating Good conditions.
Granite City, Illinois air has the highest levels of PM2.5.
Poor air quality in Granite City, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Granite City, Illinois are currently 5.989 μg/m3.
The PM10 concentration in Granite City, Illinois is 22.103 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Granite City, Illinois is 0.176 ppm.
Currently, Granite City, Illinois has a sulfur dioxide (SO2) concentration of 0.661 ppb.
The current ozone (O3) level in Granite City, Illinois at the moment is 29.221 ppm.
Nitrogen dioxide (NO2) level in Granite City, Illinois at the moment is 5.584 ppb.
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