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
5.52 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
29.65 μg/m³
0
55
155
255
425
605+
18.02 ppb
0
55
71
86
201
201+
0.66 ppb
0
36
76
186
605
1005+
3.69 ppb
0
54
101
361
1250
2050+
0.36 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Millbrae, California
Millbrae, California
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AQI 21
Good
3.40μg/m³
PM2.5
13.99μg/m³
PM10
23.14ppb
O3
2.30ppb
SO2
2.54ppb
NO2
0.32ppm
CO
AQI 23
Good
3.88μg/m³
PM2.5
14.32μg/m³
PM10
25.07ppb
O3
2.33ppb
SO2
2.44ppb
NO2
0.32ppm
CO
AQI 24
Good
3.43μg/m³
PM2.5
13.98μg/m³
PM10
25.68ppb
O3
2.31ppb
SO2
2.52ppb
NO2
0.32ppm
CO
AQI 23
Good
3.88μg/m³
PM2.5
14.32μg/m³
PM10
25.07ppb
O3
2.33ppb
SO2
2.44ppb
NO2
0.32ppm
CO
AQI 21
Good
3.39μg/m³
PM2.5
13.99μg/m³
PM10
22.85ppb
O3
2.30ppb
SO2
2.61ppb
NO2
0.32ppm
CO
AQI 21
Good
3.45μg/m³
PM2.5
13.97μg/m³
PM10
22.69ppb
O3
2.32ppb
SO2
2.43ppb
NO2
0.32ppm
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 2025-07-29.
The best air quality in Millbrae, California was recorded at 11:00:00 on 2025-07-29.
The real-time air quality index in Millbrae, California is 33, 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 5.827 μg/m3.
The current PM10 levels in Millbrae, California are 29.679 μg/m3.
The current carbon monoxide (CO) level in Millbrae, California is 0.318 ppm.
The current sulfur dioxide (SO2) levels in Millbrae, California are 1.438 ppb.
The current ozone (O3) levels at Millbrae, California is 21.076 ppm.
The current nitrogen dioxide (NO2) levels at Millbrae, California is 2.327 ppb.
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