Stay updated with real-time air quality in Winnetka, 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)
31
Good
Winnetka, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.31 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
8.99 μg/m³
0
55
155
255
425
605+
33.41 ppb
0
55
71
86
201
201+
0.35 ppb
0
36
76
186
605
1005+
2.30 ppb
0
54
101
361
1250
2050+
0.14 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Winnetka, Illinois
Winnetka, Illinois
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AQI 30
Good
2.63μg/m³
PM2.5
10.25μg/m³
PM10
31.82ppb
O3
0.35ppb
SO2
2.01ppb
NO2
0.15ppm
CO
AQI 30
Good
2.62μg/m³
PM2.5
10.35μg/m³
PM10
31.99ppb
O3
0.35ppb
SO2
1.98ppb
NO2
0.15ppm
CO
AQI 28
Good
2.35μg/m³
PM2.5
9.18μg/m³
PM10
30.29ppb
O3
0.35ppb
SO2
2.05ppb
NO2
0.15ppm
CO
AQI 29
Good
2.46μg/m³
PM2.5
8.41μg/m³
PM10
31.46ppb
O3
0.35ppb
SO2
2.05ppb
NO2
0.15ppm
CO
AQI 30
Good
2.82μg/m³
PM2.5
11.44μg/m³
PM10
31.86ppb
O3
0.35ppb
SO2
2.02ppb
NO2
0.15ppm
CO
AQI 29
Good
2.69μg/m³
PM2.5
11.05μg/m³
PM10
30.65ppb
O3
0.35ppb
SO2
2.03ppb
NO2
0.15ppm
CO
Air quality data and pollutant measurements for Illinois, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Winnetka, Illinois is updated every hour.
The worst air quality in Winnetka, Illinois in the last 24 hours was observed at 11:00:00 on 2026-06-13.
In the last 24 hrs, the best air quality in Winnetka, Illinois was observed at 10:00:00 on 2026-06-14.
The current air quality in Winnetka, Illinois is 30, categorized as Good based on real-time data.
The most common pollutant in Winnetka, Illinois is O3.
If the air quality in Winnetka, Illinois is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Winnetka, Illinois is 2.564 μg/m3.
The current PM10 concentration at Winnetka, Illinois is 9.491 μg/m3.
The current carbon monoxide (CO) concentration at Winnetka, Illinois is 0.151 ppm.
The current sulfur dioxide (SO2) concentration at Winnetka, Illinois is 0.351 ppb.
The current ozone (O3) concentration at Winnetka, Illinois is 31.734 ppm.
The current nitrogen dioxide (NO2) concentration at Winnetka, Illinois is 2.032 ppb.
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