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)
58
Moderate
Belmont, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
12.58 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
57.33 μg/m³
0
55
155
255
425
605+
12.80 ppb
0
55
71
86
201
201+
0.33 ppb
0
36
76
186
605
1005+
24.87 ppb
0
54
101
361
1250
2050+
0.42 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Belmont, California
Belmont, California
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AQI 56
Moderate
12.41μg/m³
PM2.5
56.89μg/m³
PM10
9.75ppb
O3
0.33ppb
SO2
30.46ppb
NO2
0.47ppm
CO
AQI 58
Moderate
12.60μg/m³
PM2.5
57.32μg/m³
PM10
13.82ppb
O3
0.33ppb
SO2
23.10ppb
NO2
0.40ppm
CO
AQI 56
Moderate
12.40μg/m³
PM2.5
56.99μg/m³
PM10
8.04ppb
O3
0.33ppb
SO2
33.44ppb
NO2
0.50ppm
CO
AQI 49
Good
9.14μg/m³
PM2.5
27.50μg/m³
PM10
26.32ppb
O3
0.32ppb
SO2
9.81ppb
NO2
0.35ppm
CO
AQI 56
Moderate
12.40μg/m³
PM2.5
56.99μg/m³
PM10
8.04ppb
O3
0.33ppb
SO2
33.44ppb
NO2
0.50ppm
CO
AQI 52
Moderate
10.29μg/m³
PM2.5
50.84μg/m³
PM10
25.85ppb
O3
0.32ppb
SO2
10.19ppb
NO2
0.33ppm
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 2026-05-20.
In the last 24 hours, the best air quality in Belmont, California was observed at 02:00:00 on 2026-05-20.
As of now, the AQI in Belmont, California is 58, indicating Moderate 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 12.577 μg/m3.
The PM10 concentration in Belmont, California is 57.334 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Belmont, California is 0.416 ppm.
Currently, Belmont, California has a sulfur dioxide (SO2) concentration of 0.326 ppb.
The current ozone (O3) level in Belmont, California at the moment is 12.796 ppm.
Nitrogen dioxide (NO2) level in Belmont, California at the moment is 24.868 ppb.
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