Stay updated with real-time air quality in Brea, 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)
56
Moderate
Brea, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
12.11 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
32.44 μg/m³
0
55
155
255
425
605+
27.18 ppb
0
55
71
86
201
201+
0.22 ppb
0
36
76
186
605
1005+
5.30 ppb
0
54
101
361
1250
2050+
0.15 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Brea, California
Brea, California
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AQI 52
Moderate
10.17μg/m³
PM2.5
37.55μg/m³
PM10
37.05ppb
O3
0.41ppb
SO2
3.19ppb
NO2
0.23ppm
CO
AQI 52
Moderate
10.39μg/m³
PM2.5
27.65μg/m³
PM10
35.40ppb
O3
0.40ppb
SO2
5.36ppb
NO2
0.25ppm
CO
AQI 54
Moderate
10.56μg/m³
PM2.5
32.50μg/m³
PM10
37.32ppb
O3
0.40ppb
SO2
6.43ppb
NO2
0.29ppm
CO
AQI 54
Moderate
11.10μg/m³
PM2.5
37.01μg/m³
PM10
40.79ppb
O3
0.40ppb
SO2
4.61ppb
NO2
0.24ppm
CO
AQI 52
Moderate
10.13μg/m³
PM2.5
36.86μg/m³
PM10
37.53ppb
O3
0.41ppb
SO2
3.93ppb
NO2
0.23ppm
CO
AQI 54
Moderate
10.71μg/m³
PM2.5
34.61μg/m³
PM10
39.44ppb
O3
0.40ppb
SO2
7.07ppb
NO2
0.27ppm
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 Brea, California is updated every hour.
The worst air quality in Brea, California in the last 24 hours was observed at 10:00:00 on 2025-07-11.
In the last 24 hrs, the best air quality in Brea, California was observed at 11:00:00 on 2025-07-11.
The current air quality in Brea, California is 44, categorized as Good based on real-time data.
The most common pollutant in Brea, California is PM2.5.
If the air quality in Brea, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Brea, California is 8.279 μg/m3.
The current PM10 concentration at Brea, California is 36.494 μg/m3.
The current carbon monoxide (CO) concentration at Brea, California is 0.15 ppm.
The current sulfur dioxide (SO2) concentration at Brea, California is 3.523 ppb.
The current ozone (O3) concentration at Brea, California is 32.879 ppm.
The current nitrogen dioxide (NO2) concentration at Brea, California is 11.684 ppb.
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