Air Quality in Waltham, United States

Cloudy
13.9°C · 70.4% humidity
13.9°
Feels 13.9°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations

Nearby Monitoring Stations

AQI Forecast
34 11pm
54
54
25 2am
33
39
43 5am
46
49
30 8am
24
23
24 11am
24
24
24 2pm
25
25
25 5pm
25
25
25 8pm
34
34
AD 728×90

Air Quality Index Trend

46h · 4 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.

70.4%
Humidity
19.7 km/h
Wind SW
999.7 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
25
5.95 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Waltham?

Temperature & Precipitation

PM2.5 Trend

46h · 4 stations
PM2.55.95 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (3 stations within 25 km)
5.95
Median
6.23
Average
5.3
Low
7.2
High
PM2.5 µg/m³ · Model: 9.65 · Bias: +3.7

What is the 7-day forecast for Waltham?

06-09
34.8° 13.9°
0.06 mm
06-10
22.5° 12.4°
1.81 mm
06-11
25.8° 9.8°
06-12
21.5° 14.7°
1.25 mm
06-13
30.7° 17.2°
0.5 mm
06-14
24.6° 9.1°
6.5 mm
06-15
24.9° 14.0°
0.38 mm
Both models agree Avg diff: 6.9°C

Where are air quality stations near Waltham?

22
Nubian Square - DEP Station
13.6 km PM2.5: 5.3 µg/m³
16
Boston Roxbury
13.6 km PM2.5: 3.8 µg/m³
21
Boston
14.6 km PM2.5: 5.0 µg/m³
9
Boston
14.6 km PM2.5: 2.2 µg/m³
21
Milton Blue Hill Observatory
20.9 km PM2.5: 5.0 µg/m³

What cities are near Waltham?

25 Watertown 25 Belmont 24 Brighton 24 Chestnut Hill 24 Allston 24 Wellesley 24 Needham 24 Brookline 24 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 2026-06-09T06:37 UTC.