Stay updated with real-time air quality in Belmont, 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)
27
Good
Belmont, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.92 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.25 μg/m³
0
55
155
255
425
605+
20.55 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
0.97 ppb
0
54
101
361
1250
2050+
0.21 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Belmont, California
Belmont, California
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AQI 27
Good
4.50μg/m³
PM2.5
19.56μg/m³
PM10
18.76ppb
O3
0.37ppb
SO2
1.86ppb
NO2
0.20ppm
CO
AQI 22
Good
4.25μg/m³
PM2.5
18.45μg/m³
PM10
20.68ppb
O3
0.36ppb
SO2
1.73ppb
NO2
0.21ppm
CO
AQI 27
Good
4.60μg/m³
PM2.5
19.99μg/m³
PM10
18.02ppb
O3
0.37ppb
SO2
1.90ppb
NO2
0.20ppm
CO
AQI 22
Good
4.22μg/m³
PM2.5
17.33μg/m³
PM10
23.83ppb
O3
0.35ppb
SO2
1.78ppb
NO2
0.24ppm
CO
AQI 27
Good
4.60μg/m³
PM2.5
19.99μg/m³
PM10
18.02ppb
O3
0.37ppb
SO2
1.90ppb
NO2
0.20ppm
CO
AQI 23
Good
4.29μg/m³
PM2.5
18.30μg/m³
PM10
24.88ppb
O3
0.34ppb
SO2
1.83ppb
NO2
0.25ppm
CO
Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Belmont, California is updated every hour for accuracy.
In the past 24 hours, the air quality in Belmont, California was at its worst at 10:00:00 on 2026-09-20.
In the last 24 hours, the best air quality in Belmont, California was observed at 08:00:00 on 2026-09-21.
As of now, the AQI in Belmont, California is 27, indicating Good conditions.
Belmont, California air has the highest levels of PM2.5.
Poor air quality in Belmont, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Belmont, California are currently 4.916 μg/m3.
The PM10 concentration in Belmont, California is 21.254 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belmont, California is 0.21 ppm.
Currently, Belmont, California has a sulfur dioxide (SO2) concentration of 0.328 ppb.
The current ozone (O3) level in Belmont, California at the moment is 20.548 ppm.
Nitrogen dioxide (NO2) level in Belmont, California at the moment is 0.974 ppb.
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