Stay updated with real-time air quality in Westminster, California 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)
58
Moderate
Westminster, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
13.31 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
37.11 μg/m³
0
55
155
255
425
605+
31.34 ppb
0
55
71
86
201
201+
0.62 ppb
0
36
76
186
605
1005+
8.04 ppb
0
54
101
361
1250
2050+
0.29 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Westminster, California
Westminster, California
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AQI 33
Good
5.64μg/m³
PM2.5
22.73μg/m³
PM10
25.07ppb
O3
0.44ppb
SO2
13.72ppb
NO2
0.31ppm
CO
AQI 33
Good
5.72μg/m³
PM2.5
23.59μg/m³
PM10
25.12ppb
O3
0.43ppb
SO2
14.93ppb
NO2
0.39ppm
CO
AQI 33
Good
6.35μg/m³
PM2.5
29.77μg/m³
PM10
25.36ppb
O3
0.39ppb
SO2
11.78ppb
NO2
0.32ppm
CO
AQI 33
Good
5.69μg/m³
PM2.5
23.03μg/m³
PM10
25.12ppb
O3
0.43ppb
SO2
13.35ppb
NO2
0.27ppm
CO
AQI 38
Good
6.58μg/m³
PM2.5
24.50μg/m³
PM10
26.60ppb
O3
0.40ppb
SO2
14.68ppb
NO2
0.25ppm
CO
AQI 27
Good
5.44μg/m³
PM2.5
21.47μg/m³
PM10
25.40ppb
O3
0.40ppb
SO2
10.85ppb
NO2
0.21ppm
CO
Air quality data and pollutant measurements for California, 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 Westminster, California is updated every hour.
The worst air quality in Westminster, California in the last 24 hours was observed at 07:00:00 on 2025-07-09.
In the last 24 hrs, the best air quality in Westminster, California was observed at 04:00:00 on 2025-07-10.
The current air quality in Westminster, California is 38, categorized as Good based on real-time data.
The most common pollutant in Westminster, California is PM2.5.
If the air quality in Westminster, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Westminster, California is 6.783 μg/m3.
The current PM10 concentration at Westminster, California is 23.36 μg/m3.
The current carbon monoxide (CO) concentration at Westminster, California is 0.326 ppm.
The current sulfur dioxide (SO2) concentration at Westminster, California is 0.357 ppb.
The current ozone (O3) concentration at Westminster, California is 24.21 ppm.
The current nitrogen dioxide (NO2) concentration at Westminster, California is 14.085 ppb.
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