Stay updated with real-time air quality in Winfield, 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)
27
Good
Winfield, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.54 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.82 μg/m³
0
55
155
255
425
605+
23.23 ppb
0
55
71
86
201
201+
0.27 ppb
0
36
76
186
605
1005+
6.90 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Winfield, Illinois
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AQI 24
Good
3.30μg/m³
PM2.5
15.11μg/m³
PM10
26.35ppb
O3
0.34ppb
SO2
9.45ppb
NO2
0.18ppm
CO
AQI 20
Good
3.37μg/m³
PM2.5
15.51μg/m³
PM10
22.43ppb
O3
0.35ppb
SO2
12.58ppb
NO2
0.18ppm
CO
AQI 21
Good
3.30μg/m³
PM2.5
14.64μg/m³
PM10
23.18ppb
O3
0.35ppb
SO2
10.73ppb
NO2
0.18ppm
CO
AQI 20
Good
3.34μg/m³
PM2.5
15.11μg/m³
PM10
22.09ppb
O3
0.35ppb
SO2
12.06ppb
NO2
0.18ppm
CO
AQI 20
Good
3.46μg/m³
PM2.5
15.97μg/m³
PM10
22.26ppb
O3
0.35ppb
SO2
13.02ppb
NO2
0.18ppm
CO
AQI 24
Good
3.30μg/m³
PM2.5
13.50μg/m³
PM10
26.39ppb
O3
0.35ppb
SO2
9.78ppb
NO2
0.19ppm
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 Winfield, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Winfield, Illinois was at its worst at 06:00:00 on 2026-03-10.
In the last 24 hours, the best air quality in Winfield, Illinois was observed at 02:00:00 on 2026-03-11.
As of now, the AQI in Winfield, Illinois is 27, indicating Good conditions.
Winfield, Illinois air has the highest levels of PM2.5.
Poor air quality in Winfield, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Winfield, Illinois are currently 4.541 μg/m3.
The PM10 concentration in Winfield, Illinois is 17.82 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Winfield, Illinois is 0.221 ppm.
Currently, Winfield, Illinois has a sulfur dioxide (SO2) concentration of 0.265 ppb.
The current ozone (O3) level in Winfield, Illinois at the moment is 23.229 ppm.
Nitrogen dioxide (NO2) level in Winfield, Illinois at the moment is 6.899 ppb.
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