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)
77
Moderate
Westchester, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
22.65 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
99.39 μg/m³
0
55
155
255
425
605+
35.33 ppb
0
55
71
86
201
201+
0.26 ppb
0
36
76
186
605
1005+
3.59 ppb
0
54
101
361
1250
2050+
0.40 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Westchester, Illinois
Scroll To Air Quality MapLoading...
AQI 73
Moderate
20.67μg/m³
PM2.5
90.50μg/m³
PM10
23.79ppb
O3
0.37ppb
SO2
8.61ppb
NO2
0.30ppm
CO
AQI 75
Moderate
22.17μg/m³
PM2.5
97.14μg/m³
PM10
24.40ppb
O3
0.35ppb
SO2
8.52ppb
NO2
0.31ppm
CO
AQI 71
Moderate
20.25μg/m³
PM2.5
88.61μg/m³
PM10
23.32ppb
O3
0.38ppb
SO2
8.64ppb
NO2
0.30ppm
CO
AQI 73
Moderate
21.32μg/m³
PM2.5
93.53μg/m³
PM10
25.03ppb
O3
0.35ppb
SO2
8.53ppb
NO2
0.30ppm
CO
AQI 73
Moderate
20.75μg/m³
PM2.5
90.86μg/m³
PM10
23.74ppb
O3
0.37ppb
SO2
8.61ppb
NO2
0.30ppm
CO
AQI 71
Moderate
20.01μg/m³
PM2.5
87.53μg/m³
PM10
23.06ppb
O3
0.38ppb
SO2
8.66ppb
NO2
0.30ppm
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 2025-07-13.
In the last 24 hours, the best air quality in Westchester, Illinois was observed at 03:00:00 on 2025-07-13.
As of now, the AQI in Westchester, Illinois is 73, 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 21.202 μg/m3.
The PM10 concentration in Westchester, Illinois is 92.88 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Westchester, Illinois is 0.303 ppm.
Currently, Westchester, Illinois has a sulfur dioxide (SO2) concentration of 0.36 ppb.
The current ozone (O3) level in Westchester, Illinois at the moment is 24.165 ppm.
Nitrogen dioxide (NO2) level in Westchester, Illinois at the moment is 8.571 ppb.
All Rights Reserved © Ambee Inc. 2025