Stay updated with real-time air quality in Millbrae, 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)
33
Good
Millbrae, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
28.82 μg/m³
0
55
155
255
425
605+
26.21 ppb
0
55
71
86
201
201+
0.56 ppb
0
36
76
186
605
1005+
2.21 ppb
0
54
101
361
1250
2050+
0.32 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Millbrae, California
Millbrae, California
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AQI 27
Good
5.16μg/m³
PM2.5
23.81μg/m³
PM10
25.36ppb
O3
0.59ppb
SO2
2.34ppb
NO2
0.34ppm
CO
AQI 38
Good
6.52μg/m³
PM2.5
22.73μg/m³
PM10
25.70ppb
O3
0.58ppb
SO2
2.34ppb
NO2
0.33ppm
CO
AQI 38
Good
6.63μg/m³
PM2.5
22.71μg/m³
PM10
25.50ppb
O3
0.58ppb
SO2
2.34ppb
NO2
0.34ppm
CO
AQI 38
Good
6.52μg/m³
PM2.5
22.73μg/m³
PM10
25.70ppb
O3
0.58ppb
SO2
2.34ppb
NO2
0.33ppm
CO
AQI 38
Good
6.73μg/m³
PM2.5
24.63μg/m³
PM10
25.98ppb
O3
0.58ppb
SO2
2.32ppb
NO2
0.34ppm
CO
AQI 27
Good
5.13μg/m³
PM2.5
25.86μg/m³
PM10
25.24ppb
O3
0.59ppb
SO2
2.40ppb
NO2
0.34ppm
CO
Air quality measurements for California, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Millbrae, California is updated on an hourly basis.
The worst air quality in Millbrae, California was recorded at 11:00:00 on 2026-08-08.
The best air quality in Millbrae, California was recorded at 09:00:00 on 2026-08-08.
The real-time air quality index in Millbrae, California is 38, currently categorized as Good.
The most common pollutant in Millbrae, California is PM2.5.
If the air quality in Millbrae, California is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Millbrae, California at present are 7.012 μg/m3.
The current PM10 levels in Millbrae, California are 27.164 μg/m3.
The current carbon monoxide (CO) level in Millbrae, California is 0.34 ppm.
The current sulfur dioxide (SO2) levels in Millbrae, California are 0.591 ppb.
The current ozone (O3) levels at Millbrae, California is 26.8 ppm.
The current nitrogen dioxide (NO2) levels at Millbrae, California is 2.42 ppb.
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