What is the air quality in Belmont today?

The current Air Quality Index (AQI) in Belmont is 20 (Good). PM2.5 concentration is 4.68 µg/m³.

What is the temperature in Belmont right now?

The current temperature in Belmont is 17.5°C (feels like 17.5°C). Humidity is 71.8% and wind speed is 51.9 km/h.

Is it safe to go outside in Belmont?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Belmont, United States

Windy

17.5°C · 71.8% humidity

17.5°

Feels 17.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

26 stations

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 105 stn

View full history →

Belmont's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

71.8%

Humidity

51.9 km/h

Wind W

1014.8 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.68 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Belmont?

Temperature & Precipitation

PM2.5 Trend

46h · 105 stations

PM2.54.68 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (26 stations within 25 km)

4.68

Median

4.5

Average

3.33

Low

6.7

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +1.1

What is the 7-day forecast for Belmont?

10-20

22.3° 12.4°

10-21

22.8° 12.8°

0.13 mm

10-22

24.0° 12.5°

10-23

20.9° 13.2°

10-24

21.3° 12.6°

10-25

21.8° 12.5°

3.25 mm

10-26

20.9° 12.6°

Both models agree Avg diff: 2.7°C

Where are air quality stations near Belmont?

Emerald Hills

7.3 km PM2.5: 3.8 µg/m³

Redwood City, San Mateo, California

7.6 km PM2.5: 6.7 µg/m³

Berkeley-Palo Alto

13.5 km PM2.5: 3.7 µg/m³

Belle Air School

16.2 km PM2.5: 4.1 µg/m³

Garden Ave Residence

16.3 km PM2.5: 4.4 µg/m³

Parkside Intermediate School

16.5 km PM2.5: 4.5 µg/m³

San Bruno School District Office

16.8 km PM2.5: 4.2 µg/m³

San Bruno City Hall

16.9 km PM2.5: 4.4 µg/m³

7th & Walnut Park

17.0 km PM2.5: 4.4 µg/m³

Forest Lane Park

17.7 km PM2.5: 4.7 µg/m³

What cities are near Belmont?

20 San Carlos 19 Foster City 23 Redwood City 19 San Mateo 19 Burlingame 20 Menlo Park 19 Millbrae 16 East Palo Alto 16 Palo Alto 19 San Bruno

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-20T23:43 UTC.