Stay updated with real-time air quality in West Allis, Wisconsin 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)
23
Good
West Allis, Wisconsin
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.05 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
14.34 μg/m³
0
55
155
255
425
605+
24.63 ppb
0
55
71
86
201
201+
1.25 ppb
0
36
76
186
605
1005+
9.25 ppb
0
54
101
361
1250
2050+
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
West Allis, Wisconsin
West Allis, Wisconsin
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AQI 23
Good
4.05μg/m³
PM2.5
15.39μg/m³
PM10
24.82ppb
O3
1.26ppb
SO2
8.81ppb
NO2
0.28ppm
CO
AQI 22
Good
4.01μg/m³
PM2.5
11.05μg/m³
PM10
24.28ppb
O3
1.22ppb
SO2
10.65ppb
NO2
0.29ppm
CO
AQI 22
Good
4.00μg/m³
PM2.5
10.27μg/m³
PM10
24.23ppb
O3
1.22ppb
SO2
10.95ppb
NO2
0.29ppm
CO
AQI 23
Good
4.01μg/m³
PM2.5
16.86μg/m³
PM10
24.83ppb
O3
1.28ppb
SO2
8.51ppb
NO2
0.28ppm
CO
AQI 22
Good
4.22μg/m³
PM2.5
11.21μg/m³
PM10
24.39ppb
O3
1.16ppb
SO2
10.32ppb
NO2
0.27ppm
CO
AQI 22
Good
4.30μg/m³
PM2.5
10.29μg/m³
PM10
24.39ppb
O3
1.13ppb
SO2
9.75ppb
NO2
0.25ppm
CO
Air quality data and pollutant measurements for Wisconsin, 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 West Allis, Wisconsin is updated every hour.
The worst air quality in West Allis, Wisconsin in the last 24 hours was observed at 05:00:00 on 2026-01-25.
In the last 24 hrs, the best air quality in West Allis, Wisconsin was observed at 01:00:00 on 2026-01-25.
The current air quality in West Allis, Wisconsin is 23, categorized as Good based on real-time data.
The most common pollutant in West Allis, Wisconsin is O3.
If the air quality in West Allis, Wisconsin is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at West Allis, Wisconsin is 4.046 μg/m3.
The current PM10 concentration at West Allis, Wisconsin is 14.335 μg/m3.
The current carbon monoxide (CO) concentration at West Allis, Wisconsin is 0.283 ppm.
The current sulfur dioxide (SO2) concentration at West Allis, Wisconsin is 1.246 ppb.
The current ozone (O3) concentration at West Allis, Wisconsin is 24.629 ppm.
The current nitrogen dioxide (NO2) concentration at West Allis, Wisconsin is 9.254 ppb.
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