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)
44
Good
Millbrae, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
7.77 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
23.46 μg/m³
0
55
155
255
425
605+
16.19 ppb
0
55
71
86
201
201+
0.84 ppb
0
36
76
186
605
1005+
4.93 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Millbrae, California
Millbrae, California
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AQI 33
Good
5.78μg/m³
PM2.5
20.65μg/m³
PM10
13.92ppb
O3
0.55ppb
SO2
3.96ppb
NO2
0.30ppm
CO
AQI 44
Good
8.30μg/m³
PM2.5
25.55μg/m³
PM10
23.74ppb
O3
0.55ppb
SO2
3.98ppb
NO2
0.30ppm
CO
AQI 33
Good
6.24μg/m³
PM2.5
20.60μg/m³
PM10
16.42ppb
O3
0.55ppb
SO2
4.00ppb
NO2
0.30ppm
CO
AQI 44
Good
8.30μg/m³
PM2.5
25.55μg/m³
PM10
23.74ppb
O3
0.55ppb
SO2
3.98ppb
NO2
0.30ppm
CO
AQI 33
Good
5.72μg/m³
PM2.5
20.48μg/m³
PM10
12.79ppb
O3
0.55ppb
SO2
3.77ppb
NO2
0.30ppm
CO
AQI 44
Good
8.45μg/m³
PM2.5
38.81μg/m³
PM10
23.83ppb
O3
0.55ppb
SO2
3.98ppb
NO2
0.30ppm
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 03:00:00 on 2025-10-23.
The best air quality in Millbrae, California was recorded at 08:00:00 on 2025-10-23.
The real-time air quality index in Millbrae, California is 44, 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 7.771 μg/m3.
The current PM10 levels in Millbrae, California are 23.46 μg/m3.
The current carbon monoxide (CO) level in Millbrae, California is 0.237 ppm.
The current sulfur dioxide (SO2) levels in Millbrae, California are 0.843 ppb.
The current ozone (O3) levels at Millbrae, California is 16.192 ppm.
The current nitrogen dioxide (NO2) levels at Millbrae, California is 4.931 ppb.
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