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)
24
Good
Millbrae, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
4.24 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
16.67 μg/m³
0
55
155
255
425
605+
26.35 ppb
0
55
71
86
201
201+
1.36 ppb
0
36
76
186
605
1005+
4.07 ppb
0
54
101
361
1250
2050+
0.34 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Millbrae, California
Millbrae, California
Scroll To Air Quality MapLoading...
AQI 25
Good
4.35μg/m³
PM2.5
21.26μg/m³
PM10
26.78ppb
O3
1.34ppb
SO2
4.02ppb
NO2
0.34ppm
CO
AQI 27
Good
4.86μg/m³
PM2.5
26.48μg/m³
PM10
26.10ppb
O3
1.39ppb
SO2
4.05ppb
NO2
0.34ppm
CO
AQI 24
Good
4.24μg/m³
PM2.5
16.67μg/m³
PM10
26.35ppb
O3
1.36ppb
SO2
4.07ppb
NO2
0.34ppm
CO
AQI 27
Good
4.86μg/m³
PM2.5
26.48μg/m³
PM10
26.10ppb
O3
1.39ppb
SO2
4.05ppb
NO2
0.34ppm
CO
AQI 27
Good
5.07μg/m³
PM2.5
26.44μg/m³
PM10
26.36ppb
O3
1.32ppb
SO2
4.09ppb
NO2
0.34ppm
CO
AQI 25
Good
4.26μg/m³
PM2.5
19.10μg/m³
PM10
27.14ppb
O3
1.40ppb
SO2
3.88ppb
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 10:00:00 on 2025-06-05.
The best air quality in Millbrae, California was recorded at 08:00:00 on 2025-06-06.
The real-time air quality index in Millbrae, California is 24, currently categorized as Good.
The most common pollutant in Millbrae, California is O3.
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 4.243 μg/m3.
The current PM10 levels in Millbrae, California are 16.67 μg/m3.
The current carbon monoxide (CO) level in Millbrae, California is 0.341 ppm.
The current sulfur dioxide (SO2) levels in Millbrae, California are 1.356 ppb.
The current ozone (O3) levels at Millbrae, California is 26.349 ppm.
The current nitrogen dioxide (NO2) levels at Millbrae, California is 4.074 ppb.
All Rights Reserved © Ambee Inc. 2025