What is the air quality in Waltham today?

The current Air Quality Index (AQI) in Waltham is 32 (Good). PM2.5 concentration is 7.8 µg/m³.

What is the temperature in Waltham right now?

The current temperature in Waltham is 24.5°C (feels like 24.5°C). Humidity is 79.1% and wind speed is 53.7 km/h.

Is it safe to go outside in Waltham?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Waltham, United States

Rain

24.5°C · 79.1% humidity

24.5°

Feels 24.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

4 stations

Nearby Monitoring Stations

AQI Forecast

25 6pm

32 9pm

27 12am

24 3am

24 6am

25 9am

24 12pm

24 3pm

Air Quality Index Trend

45h · 7 stn

View full history →

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

79.1%

Humidity

53.7 km/h

Wind SW

1009.6 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.8 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Waltham?

Temperature & Precipitation

PM2.5 Trend

45h · 7 stations

PM2.57.8 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Station readings (4 stations within 25 km)

7.8

Median

7.76

Average

6.2

Low

9.4

High

PM2.5 µg/m³ · Model: 7.35 · Bias: -0.4

Both models agree Avg diff: 5.2°C

Where are air quality stations near Waltham?

Nubian Square - DEP Station

13.6 km PM2.5: 8.9 µg/m³

Boston Roxbury

13.6 km PM2.5: 6.0 µg/m³

Boston

14.6 km PM2.5: 5.0 µg/m³

Boston

14.6 km PM2.5: 4.1 µg/m³

Milton Blue Hill Observatory

20.9 km PM2.5: 3.4 µg/m³

What cities are near Waltham?

32 Watertown 32 Belmont 32 Brighton 32 Chestnut Hill 32 Allston 35 Wellesley 35 Needham 32 Brookline 32 Cambridge 32 Somerville

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-05-30T01:33 UTC.