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)
33
Good
Belmont, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.66 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.80 μg/m³
0
55
155
255
425
605+
27.20 ppb
0
55
71
86
201
201+
1.06 ppb
0
36
76
186
605
1005+
9.81 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Belmont, California
Belmont, California
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AQI 38
Good
6.71μg/m³
PM2.5
29.96μg/m³
PM10
22.21ppb
O3
1.29ppb
SO2
15.28ppb
NO2
0.40ppm
CO
AQI 38
Good
6.71μg/m³
PM2.5
29.74μg/m³
PM10
22.50ppb
O3
1.28ppb
SO2
13.72ppb
NO2
0.39ppm
CO
AQI 38
Good
6.70μg/m³
PM2.5
30.00μg/m³
PM10
22.01ppb
O3
1.30ppb
SO2
15.89ppb
NO2
0.40ppm
CO
AQI 33
Good
6.41μg/m³
PM2.5
34.54μg/m³
PM10
31.45ppb
O3
1.27ppb
SO2
10.25ppb
NO2
0.39ppm
CO
AQI 38
Good
6.70μg/m³
PM2.5
30.00μg/m³
PM10
22.01ppb
O3
1.30ppb
SO2
15.89ppb
NO2
0.40ppm
CO
AQI 30
Good
5.03μg/m³
PM2.5
24.27μg/m³
PM10
31.87ppb
O3
1.26ppb
SO2
10.14ppb
NO2
0.39ppm
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 03:00:00 on 2026-10-07.
In the last 24 hours, the best air quality in Belmont, California was observed at 07:00:00 on 2026-10-07.
As of now, the AQI in Belmont, California is 38, 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 6.667 μg/m3.
The PM10 concentration in Belmont, California is 29.61 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belmont, California is 0.391 ppm.
Currently, Belmont, California has a sulfur dioxide (SO2) concentration of 1.285 ppb.
The current ozone (O3) level in Belmont, California at the moment is 22.393 ppm.
Nitrogen dioxide (NO2) level in Belmont, California at the moment is 14.011 ppb.
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