Stay updated with real-time air quality in Belvidere, 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)
28
Good
Belvidere, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.33 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
30.08 μg/m³
0
55
155
255
425
605+
15.46 ppb
0
55
71
86
201
201+
0.63 ppb
0
36
76
186
605
1005+
7.28 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Belvidere, Illinois
Belvidere, Illinois
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AQI 33
Good
5.82μg/m³
PM2.5
26.39μg/m³
PM10
14.99ppb
O3
1.16ppb
SO2
7.54ppb
NO2
0.22ppm
CO
AQI 33
Good
5.81μg/m³
PM2.5
26.39μg/m³
PM10
15.00ppb
O3
1.16ppb
SO2
7.54ppb
NO2
0.22ppm
CO
AQI 33
Good
6.00μg/m³
PM2.5
27.00μg/m³
PM10
14.05ppb
O3
1.19ppb
SO2
7.43ppb
NO2
0.22ppm
CO
AQI 33
Good
5.81μg/m³
PM2.5
26.24μg/m³
PM10
15.50ppb
O3
1.13ppb
SO2
7.60ppb
NO2
0.22ppm
CO
AQI 33
Good
5.78μg/m³
PM2.5
26.46μg/m³
PM10
16.85ppb
O3
1.10ppb
SO2
7.70ppb
NO2
0.23ppm
CO
AQI 33
Good
5.95μg/m³
PM2.5
15.06μg/m³
PM10
8.56ppb
O3
1.28ppb
SO2
8.18ppb
NO2
0.23ppm
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 Belvidere, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Belvidere, Illinois was at its worst at 03:00:00 on 2026-09-07.
In the last 24 hours, the best air quality in Belvidere, Illinois was observed at 01:00:00 on 2026-09-07.
As of now, the AQI in Belvidere, Illinois is 28, indicating Good conditions.
Belvidere, Illinois air has the highest levels of PM10.
Poor air quality in Belvidere, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Belvidere, Illinois are currently 5.334 μg/m3.
The PM10 concentration in Belvidere, Illinois is 30.08 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belvidere, Illinois is 0.245 ppm.
Currently, Belvidere, Illinois has a sulfur dioxide (SO2) concentration of 0.626 ppb.
The current ozone (O3) level in Belvidere, Illinois at the moment is 15.458 ppm.
Nitrogen dioxide (NO2) level in Belvidere, Illinois at the moment is 7.281 ppb.
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