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)
44
Good
Westminster, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
7.78 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
19.44 μg/m³
0
55
155
255
425
605+
38.29 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
5.18 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Westminster, California
Westminster, California
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AQI 26
Good
3.44μg/m³
PM2.5
12.95μg/m³
PM10
28.43ppb
O3
0.43ppb
SO2
8.82ppb
NO2
0.21ppm
CO
AQI 27
Good
3.29μg/m³
PM2.5
12.95μg/m³
PM10
28.77ppb
O3
0.42ppb
SO2
9.67ppb
NO2
0.25ppm
CO
AQI 28
Good
5.20μg/m³
PM2.5
27.31μg/m³
PM10
30.38ppb
O3
0.46ppb
SO2
6.09ppb
NO2
0.24ppm
CO
AQI 26
Good
3.98μg/m³
PM2.5
14.75μg/m³
PM10
27.93ppb
O3
0.44ppb
SO2
8.98ppb
NO2
0.21ppm
CO
AQI 27
Good
5.35μg/m³
PM2.5
22.34μg/m³
PM10
27.13ppb
O3
0.46ppb
SO2
12.82ppb
NO2
0.21ppm
CO
AQI 33
Good
5.72μg/m³
PM2.5
22.01μg/m³
PM10
25.73ppb
O3
0.48ppb
SO2
9.50ppb
NO2
0.19ppm
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 09:00:00 on 2025-07-23.
In the last 24 hrs, the best air quality in Westminster, California was observed at 03:00:00 on 2025-07-24.
The current air quality in Westminster, California is 24, categorized as Good based on real-time data.
The most common pollutant in Westminster, California is O3.
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 4.453 μg/m3.
The current PM10 concentration at Westminster, California is 12.057 μg/m3.
The current carbon monoxide (CO) concentration at Westminster, California is 0.254 ppm.
The current sulfur dioxide (SO2) concentration at Westminster, California is 0.399 ppb.
The current ozone (O3) concentration at Westminster, California is 25.583 ppm.
The current nitrogen dioxide (NO2) concentration at Westminster, California is 9.775 ppb.
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