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
4.95 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
22.14 μg/m³
0
55
155
255
425
605+
22.91 ppb
0
55
71
86
201
201+
0.36 ppb
0
36
76
186
605
1005+
2.78 ppb
0
54
101
361
1250
2050+
0.30 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
4.51μg/m³
PM2.5
20.05μg/m³
PM10
22.98ppb
O3
0.37ppb
SO2
2.72ppb
NO2
0.30ppm
CO
AQI 27
Good
5.06μg/m³
PM2.5
22.69μg/m³
PM10
22.91ppb
O3
0.35ppb
SO2
2.79ppb
NO2
0.30ppm
CO
AQI 22
Good
4.30μg/m³
PM2.5
19.02μg/m³
PM10
23.00ppb
O3
0.38ppb
SO2
2.70ppb
NO2
0.30ppm
CO
AQI 27
Good
4.38μg/m³
PM2.5
22.34μg/m³
PM10
28.55ppb
O3
0.36ppb
SO2
2.88ppb
NO2
0.32ppm
CO
AQI 22
Good
4.30μg/m³
PM2.5
19.02μg/m³
PM10
23.00ppb
O3
0.38ppb
SO2
2.70ppb
NO2
0.30ppm
CO
AQI 25
Good
4.27μg/m³
PM2.5
20.60μg/m³
PM10
27.06ppb
O3
0.35ppb
SO2
2.71ppb
NO2
0.32ppm
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 2026-07-27.
In the last 24 hours, the best air quality in Belmont, California was observed at 01:00:00 on 2026-07-27.
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 4.947 μg/m3.
The PM10 concentration in Belmont, California is 22.138 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belmont, California is 0.302 ppm.
Currently, Belmont, California has a sulfur dioxide (SO2) concentration of 0.358 ppb.
The current ozone (O3) level in Belmont, California at the moment is 22.914 ppm.
Nitrogen dioxide (NO2) level in Belmont, California at the moment is 2.78 ppb.
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