Air Quality in Waltham, United States
Windy
27.1°C · 30.1% humidity
27.1°
Feels 27.1°
42
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Waltham's air quality — share it
AQI Forecast
Calibrated
55
7pm
55
55
42
10pm
46
48
50
1am
52
53
53
4am
54
54
61
7am
62
55
55
10am
55
55
55
1pm
55
55
55
4pm
55
55
Station readings
58
51
CAMS model
adj +28
27
27
27
27
27
27
27
27
27
27
27
27
34
34
27
27
27
27
27
27
27
27
27
27
Air Quality Index Trend
6h · 1 stnWaltham's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
30.1%
Humidity
53.2 km/h
Wind W
1009.1 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
10.0 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Waltham?
Temperature & Precipitation
PM2.5 Trend
6h · 1 stationPM2.510.0 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX2.2
Moderate
What is the 7-day forecast for Waltham?
08-03
27.1° 17.5°
0.44 mm
08-04
37.6° 18.1°
08-05
33.7° 22.7°
08-06
28.8° 17.0°
1.44 mm
08-07
32.1° 21.0°
4.63 mm
08-08
28.5° 19.4°
0.06 mm
08-09
40.6° 23.1°
Both models agree
Avg diff: 3.8°C
Where are air quality stations near Waltham?
51
Magazine Beach Park
53
Nubian Square - DEP Station
36
Boston Roxbury
36
Boston
36
Boston
36
Boston
34
Lynn Water Treatment Plant
What cities are near Waltham?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T02:35 UTC.