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)
28
Good
Belmont, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.36 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
14.32 μg/m³
0
55
155
255
425
605+
29.90 ppb
0
55
71
86
201
201+
0.44 ppb
0
36
76
186
605
1005+
3.63 ppb
0
54
101
361
1250
2050+
0.25 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
2.96μg/m³
PM2.5
12.30μg/m³
PM10
28.80ppb
O3
0.46ppb
SO2
3.75ppb
NO2
0.22ppm
CO
AQI 28
Good
3.53μg/m³
PM2.5
15.17μg/m³
PM10
30.45ppb
O3
0.43ppb
SO2
3.61ppb
NO2
0.26ppm
CO
AQI 26
Good
2.71μg/m³
PM2.5
11.03μg/m³
PM10
28.02ppb
O3
0.46ppb
SO2
3.80ppb
NO2
0.20ppm
CO
AQI 30
Good
4.94μg/m³
PM2.5
29.65μg/m³
PM10
31.87ppb
O3
0.43ppb
SO2
3.73ppb
NO2
0.35ppm
CO
AQI 26
Good
2.71μg/m³
PM2.5
11.03μg/m³
PM10
28.02ppb
O3
0.46ppb
SO2
3.80ppb
NO2
0.20ppm
CO
AQI 33
Good
5.20μg/m³
PM2.5
35.53μg/m³
PM10
34.12ppb
O3
0.42ppb
SO2
3.77ppb
NO2
0.37ppm
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 05:00:00 on 2026-06-12.
In the last 24 hours, the best air quality in Belmont, California was observed at 05:00:00 on 2026-06-12.
As of now, the AQI in Belmont, California is 28, indicating Good conditions.
Belmont, California air has the highest levels of O3.
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 3.356 μg/m3.
The PM10 concentration in Belmont, California is 14.317 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belmont, California is 0.251 ppm.
Currently, Belmont, California has a sulfur dioxide (SO2) concentration of 0.439 ppb.
The current ozone (O3) level in Belmont, California at the moment is 29.9 ppm.
Nitrogen dioxide (NO2) level in Belmont, California at the moment is 3.631 ppb.
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