Stay updated with real-time air quality in Westchester, 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)
67
Moderate
Westchester, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
18.05 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
80.02 μg/m³
0
55
155
255
425
605+
37.98 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
3.83 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Westchester, Illinois
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AQI 69
Moderate
19.00μg/m³
PM2.5
84.25μg/m³
PM10
42.55ppb
O3
0.41ppb
SO2
3.68ppb
NO2
0.23ppm
CO
AQI 71
Moderate
20.07μg/m³
PM2.5
88.23μg/m³
PM10
40.63ppb
O3
0.42ppb
SO2
3.72ppb
NO2
0.23ppm
CO
AQI 69
Moderate
18.57μg/m³
PM2.5
82.69μg/m³
PM10
43.81ppb
O3
0.41ppb
SO2
3.64ppb
NO2
0.23ppm
CO
AQI 71
Moderate
19.68μg/m³
PM2.5
86.63μg/m³
PM10
39.96ppb
O3
0.41ppb
SO2
3.69ppb
NO2
0.23ppm
CO
AQI 69
Moderate
19.08μg/m³
PM2.5
84.55μg/m³
PM10
42.50ppb
O3
0.41ppb
SO2
3.69ppb
NO2
0.23ppm
CO
AQI 67
Moderate
18.26μg/m³
PM2.5
81.49μg/m³
PM10
44.57ppb
O3
0.41ppb
SO2
3.62ppb
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 Westchester, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Westchester, Illinois was at its worst at 10:00:00 on 2025-07-22.
In the last 24 hours, the best air quality in Westchester, Illinois was observed at 11:00:00 on 2025-07-23.
As of now, the AQI in Westchester, Illinois is 69, indicating Moderate conditions.
Westchester, Illinois air has the highest levels of PM2.5.
Poor air quality in Westchester, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Westchester, Illinois are currently 19.428 μg/m3.
The PM10 concentration in Westchester, Illinois is 85.814 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westchester, Illinois is 0.226 ppm.
Currently, Westchester, Illinois has a sulfur dioxide (SO2) concentration of 0.412 ppb.
The current ozone (O3) level in Westchester, Illinois at the moment is 41.551 ppm.
Nitrogen dioxide (NO2) level in Westchester, Illinois at the moment is 3.697 ppb.
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