What is the air quality in Belmont today?

The current Air Quality Index (AQI) in Belmont is 20 (Good). PM2.5 concentration is 4.88 µg/m³.

What is the temperature in Belmont right now?

The current temperature in Belmont is 34.1°C (feels like 37.7°C). Humidity is 43.2% and wind speed is 61.4 km/h.

Is it safe to go outside in Belmont?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 12.9 (Extreme).

Air Quality in Belmont, United States

Windy

34.1°C · 43.2% humidity

34.1°

Feels 37.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

4 stations

Nearby Monitoring Stations

AQI Forecast Calibrated

4 10am

20 1pm

9 4pm

6 7pm

5 10pm

4 1am

4 4am

4 7am

Station readings

CAMS model adj -21

Air Quality Index Trend

47h · 1 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.

43.2%

Humidity

61.4 km/h

Wind WSW

1013.0 hPa

Pressure

12.9

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.88 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Belmont?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station

PM2.54.88 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX12.9

Extreme

Station readings (4 stations within 25 km)

4.88

Median

4.1

Average

0.8

Low

6.5

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +0.9

What is the 7-day forecast for Belmont?

09-05

34.1° 13.3°

10.0 mm

09-06

21.2° 17.9°

1.19 mm

09-07

21.1° 14.1°

09-08

19.6° 16.4°

6.75 mm

09-09

28.4° 12.8°

0.62 mm

09-10

24.4° 13.4°

3.25 mm

09-11

30.7° 12.8°

Both models agree Avg diff: 5.0°C

Where are air quality stations near Belmont?

Boston

10.6 km PM2.5: 5.0 µg/m³

Boston

10.6 km PM2.5: 6.5 µg/m³

Boston Roxbury

10.8 km PM2.5: 5.3 µg/m³

East Dedham

16.4 km 68.7°C 75.0% RH PM2.5: 0.7 µg/m³ PM10: 1.2 µg/m³

Lynn Water Treatment Plant

19.1 km PM2.5: 3.8 µg/m³

Lynn Water Treatment Plant

19.1 km PM2.5: 5.0 µg/m³

What cities are near Belmont?

20 Watertown 18 Waltham 20 Brighton 23 Allston 24 Cambridge 22 Medford 24 Somerville 18 Chestnut Hill 22 Brookline 23 Fenway/Kenmore

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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 2026-09-05T17:55 UTC.