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)
38
Good
Brea, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
7.49 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
29.51 μg/m³
0
55
155
255
425
605+
35.69 ppb
0
55
71
86
201
201+
0.14 ppb
0
36
76
186
605
1005+
5.03 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Brea, California
Brea, California
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AQI 44
Good
8.04μg/m³
PM2.5
39.68μg/m³
PM10
35.98ppb
O3
0.15ppb
SO2
3.49ppb
NO2
0.10ppm
CO
AQI 38
Good
6.84μg/m³
PM2.5
21.27μg/m³
PM10
33.97ppb
O3
0.14ppb
SO2
5.64ppb
NO2
0.19ppm
CO
AQI 38
Good
7.17μg/m³
PM2.5
22.87μg/m³
PM10
35.19ppb
O3
0.14ppb
SO2
6.72ppb
NO2
0.22ppm
CO
AQI 49
Good
8.81μg/m³
PM2.5
31.72μg/m³
PM10
38.73ppb
O3
0.14ppb
SO2
4.88ppb
NO2
0.16ppm
CO
AQI 38
Good
7.35μg/m³
PM2.5
34.43μg/m³
PM10
35.31ppb
O3
0.15ppb
SO2
3.88ppb
NO2
0.13ppm
CO
AQI 44
Good
7.63μg/m³
PM2.5
24.20μg/m³
PM10
37.31ppb
O3
0.14ppb
SO2
7.38ppb
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 Brea, California is updated every hour.
The worst air quality in Brea, California in the last 24 hours was observed at 11:00:00 on 2025-09-09.
In the last 24 hrs, the best air quality in Brea, California was observed at 01:00:00 on 2025-09-09.
The current air quality in Brea, California is 38, 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 7.487 μg/m3.
The current PM10 concentration at Brea, California is 29.508 μg/m3.
The current carbon monoxide (CO) concentration at Brea, California is 0.167 ppm.
The current sulfur dioxide (SO2) concentration at Brea, California is 0.144 ppb.
The current ozone (O3) concentration at Brea, California is 35.689 ppm.
The current nitrogen dioxide (NO2) concentration at Brea, California is 5.029 ppb.
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