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)
75
Moderate
Brea, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
21.68 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
61.02 μg/m³
0
55
155
255
425
605+
2.95 ppb
0
55
71
86
201
201+
0.23 ppb
0
36
76
186
605
1005+
20.61 ppb
0
54
101
361
1250
2050+
0.65 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Brea, California
Brea, California
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AQI 69
Moderate
19.35μg/m³
PM2.5
67.48μg/m³
PM10
2.98ppb
O3
0.20ppb
SO2
20.41ppb
NO2
0.66ppm
CO
AQI 77
Moderate
22.61μg/m³
PM2.5
43.99μg/m³
PM10
3.21ppb
O3
0.26ppb
SO2
20.92ppb
NO2
0.63ppm
CO
AQI 75
Moderate
22.35μg/m³
PM2.5
50.21μg/m³
PM10
3.10ppb
O3
0.26ppb
SO2
20.83ppb
NO2
0.63ppm
CO
AQI 73
Moderate
20.96μg/m³
PM2.5
60.78μg/m³
PM10
3.00ppb
O3
0.24ppb
SO2
19.01ppb
NO2
0.65ppm
CO
AQI 75
Moderate
22.40μg/m³
PM2.5
78.41μg/m³
PM10
2.58ppb
O3
0.21ppb
SO2
20.35ppb
NO2
0.67ppm
CO
AQI 73
Moderate
20.72μg/m³
PM2.5
42.88μg/m³
PM10
3.32ppb
O3
0.28ppb
SO2
20.02ppb
NO2
0.62ppm
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 06:00:00 on 2026-01-22.
In the last 24 hrs, the best air quality in Brea, California was observed at 05:00:00 on 2026-01-23.
The current air quality in Brea, California is 75, categorized as Moderate 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 21.685 μg/m3.
The current PM10 concentration at Brea, California is 61.024 μg/m3.
The current carbon monoxide (CO) concentration at Brea, California is 0.648 ppm.
The current sulfur dioxide (SO2) concentration at Brea, California is 0.232 ppb.
The current ozone (O3) concentration at Brea, California is 2.946 ppm.
The current nitrogen dioxide (NO2) concentration at Brea, California is 20.614 ppb.
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