Air Quality in Belmont, United States
Partly Cloudy
21.2°C · 52.6% humidity
21.2°
Feels 21.2°
64
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
Belmont's air quality — share it
AQI Forecast
54
11pm
54
34
64
2am
55
49
38
5am
42
40
38
8am
37
36
35
11am
35
35
35
2pm
34
34
34
5pm
54
54
54
8pm
54
54
Air Quality Index Trend
45h · 99 stnBelmont's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Belmont is 1.2× the WHO 24-hour guideline of 15 µg/m³.
52.6%
Humidity
30.3 km/h
Wind WNW
1011.2 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
18.1 µg/m³
PM10
59.3 µg/m³
050100150200300500
What is the weather forecast for Belmont?
Temperature & Precipitation
PM2.5 Trend
45h · 99 stationsPM2.518.1 µg/m³
×1.2 WHO
Moderate
PM1059.3 µg/m³
Moderate
UV INDEX12.9
Extreme
What is the 7-day forecast for Belmont?
08-03
22.8° 13.1°
08-04
21.3° 13.2°
08-05
23.8° 12.2°
08-06
23.1° 12.6°
08-07
21.3° 13.2°
08-08
22.5° 14.3°
08-09
24.3° 12.1°
Both models agree
Avg diff: 2.4°C
Where are air quality stations near Belmont?
35
Emerald Hills
21
Redwood City, San Mateo, California
57
Redwood City, San Mateo, California
28
Berkeley-Palo Alto
31
Belle Air School
37
Garden Ave Residence
35
Parkside Intermediate School
32
San Bruno School District Office
35
Pacific Ave Residence
38
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T09:17 UTC.