Air Quality in Watertown, United States

Rain
24.5°C · 79.1% humidity
24.5°
Feels 24.5°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast

Nearby Monitoring Stations

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

Air Quality Index Trend

46h · 6 stn

Watertown'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
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
25
5.9 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Watertown?

Temperature & Precipitation

PM2.5 Trend

46h · 6 stations
PM2.55.9 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.9
Moderate
AD 300×250

What is the 7-day forecast for Watertown?

05-29
19.2° 11.2°
0.13 mm
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
Both models agree Avg diff: 5.3°C

Where are air quality stations near Watertown?

21
Nubian Square - DEP Station
9.4 km PM2.5: 5.1 µg/m³
44
Boston Roxbury
9.5 km PM2.5: 10.6 µg/m³
44
Boston
10.2 km PM2.5: 10.6 µg/m³
45
Boston
10.2 km PM2.5: 10.8 µg/m³
35
Milton Blue Hill Observatory
18.6 km PM2.5: 8.4 µg/m³

What cities are near Watertown?

25 Belmont 25 Brighton 25 Waltham 25 Chestnut Hill 25 Allston 25 Cambridge 25 Brookline 25 Somerville 25 Mission Hill 25 Fenway/Kenmore
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T21:10 UTC.