Air Quality in Waltham, United States

Rain
24.5°C · 79.1% humidity
24.5°
Feels 24.5°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
4 stations

Nearby Monitoring Stations

AQI Forecast
27 8pm
34
34
26 11pm
27
25
25 2am
24
24
24 5am
24
24
24 8am
25
24
24 11am
24
24
24 2pm
24
25
24 5pm
24
24
AD 728×90

Air Quality Index Trend

45h · 6 stn

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▲
26
6.33 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Waltham?

Temperature & Precipitation

PM2.5 Trend

45h · 6 stations
PM2.56.33 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (4 stations within 25 km)
6.33
Median
5.97
Average
5.3
Low
7.98
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +1.0

What is the 7-day forecast for Waltham?

05-30
24.5° 9.2°
8.56 mm
05-31
25.5° 10.0°
0.5 mm
06-01
22.7° 8.1°
06-02
20.9° 12.2°
0.44 mm
06-03
27.3° 14.7°
06-04
22.8° 17.5°
0.13 mm
06-05
23.7° 11.0°
0.69 mm
Both models agree Avg diff: 5.2°C

Where are air quality stations near Waltham?

33
Nubian Square - DEP Station
13.6 km PM2.5: 8.0 µg/m³
25
Boston Roxbury
13.6 km PM2.5: 6.0 µg/m³
20
Boston
14.6 km PM2.5: 4.8 µg/m³
7
Boston
14.6 km PM2.5: 1.7 µg/m³
34
Milton Blue Hill Observatory
20.9 km PM2.5: 8.2 µg/m³

What cities are near Waltham?

27 Watertown 26 Belmont 28 Brighton 28 Chestnut Hill 28 Allston 26 Wellesley 26 Needham 30 Brookline 26 Cambridge 25 Somerville
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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 2026-05-30T03:00 UTC.