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)
41
Good
Brea, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.12 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
18.38 μg/m³
0
55
155
255
425
605+
43.74 ppb
0
55
71
86
201
201+
0.85 ppb
0
36
76
186
605
1005+
11.51 ppb
0
54
101
361
1250
2050+
0.48 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Very high
Brea, California
Brea, California
Scroll To Air Quality MapLoading...
AQI 44
Good
5.14μg/m³
PM2.5
18.49μg/m³
PM10
47.96ppb
O3
0.83ppb
SO2
6.24ppb
NO2
0.42ppm
CO
AQI 44
Good
5.69μg/m³
PM2.5
19.98μg/m³
PM10
48.37ppb
O3
0.69ppb
SO2
11.65ppb
NO2
0.56ppm
CO
AQI 44
Good
5.50μg/m³
PM2.5
20.15μg/m³
PM10
48.02ppb
O3
0.69ppb
SO2
13.19ppb
NO2
0.56ppm
CO
AQI 44
Good
4.85μg/m³
PM2.5
18.66μg/m³
PM10
48.06ppb
O3
0.79ppb
SO2
8.69ppb
NO2
0.45ppm
CO
AQI 44
Good
4.55μg/m³
PM2.5
16.64μg/m³
PM10
47.14ppb
O3
0.80ppb
SO2
8.19ppb
NO2
0.42ppm
CO
AQI 44
Good
5.81μg/m³
PM2.5
21.65μg/m³
PM10
48.39ppb
O3
0.72ppb
SO2
13.66ppb
NO2
0.53ppm
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 09:00:00 on 2026-04-23.
In the last 24 hrs, the best air quality in Brea, California was observed at 10:00:00 on 2026-04-23.
The current air quality in Brea, California is 41, categorized as Good based on real-time data.
The most common pollutant in Brea, California is O3.
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 5.115 μg/m3.
The current PM10 concentration at Brea, California is 18.378 μg/m3.
The current carbon monoxide (CO) concentration at Brea, California is 0.485 ppm.
The current sulfur dioxide (SO2) concentration at Brea, California is 0.846 ppb.
The current ozone (O3) concentration at Brea, California is 43.744 ppm.
The current nitrogen dioxide (NO2) concentration at Brea, California is 11.513 ppb.
All Rights Reserved © Ambee Inc. 2025