Air Quality in Brea, United States

Clear
30.0°C · 37.3% humidity
30.0°
Feels 30.0°
58
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Calibrated model

Nearby Monitoring Stations

AQI Forecast Calibrated
34 4pm
34
34
58 7pm
51
46
43 10pm
28
27
25 1am
24
24
23 4am
35
35
34 7am
22
34
34 10am
34
34
34 1pm
34
34
Station readings
38
33
25
CAMS model adj -32
66
66
66
66
66
66
66
54
54
54
54
54
54
66
66
66
54
66
66
66
66
66
66
66
AD 728×90

Air Quality Index Trend

47h · 1 stn

Brea's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Brea is 1.0× the WHO 24-hour guideline of 15 µg/m³.

37.3%
Humidity
33.9 km/h
Wind SW
1010.1 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5
58
15.27 µg/m³
PM10▲
60
73.05 µg/m³
050100150200300500

What is the weather forecast for Brea?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.515.27 µg/m³ ✓ WHO
Moderate
PM1073.05 µg/m³
Moderate
UV INDEX17.4
Extreme
AD 300×250

What is the 7-day forecast for Brea?

08-03
34.0° 23.6°
08-04
32.4° 24.7°
08-05
35.9° 23.7°
08-06
34.3° 20.7°
08-07
29.7° 24.1°
08-08
32.9° 21.1°
08-09
30.9° 20.1°
Both models agree Avg diff: 2.7°C

Where are air quality stations near Brea?

54
Garfield HS/Monterey CHS (8677)
26.9 km PM2.5: 13.4 µg/m³
25
united-states-of-america-san-marino-sierra-madre-boulevard
30.6 km 36.7°C 29.0% RH PM2.5: 6.0 µg/m³ PM10: 6.0 µg/m³
45
Sierra Park ES (6753)
30.9 km PM2.5: 10.8 µg/m³
50
Sierra Vista ES (6767)
31.1 km PM2.5: 12.0 µg/m³

What cities are near Brea?

75 La Habra 46 Placentia 55 Fullerton 75 Rowland Heights 51 Yorba Linda 55 Anaheim 75 La Mirada 74 Buena Park 42 Hacienda Heights 42 South San Jose Hills
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T02:58 UTC.