Air Quality in Watertown, United States

Rain
16.9°C · 96.5% humidity
16.9°
Feels 16.9°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
4 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
62 2pm
62
62
60 5pm
62
62
62 8pm
62
55
55 11pm
53
53
52 2am
52
52
52 5am
52
52
52 8am
52
52
52 11am
52
53
Station readings
65
65
71
CAMS model adj +28
34
34
34
34
34
34
34
34
27
27
25
25
24
24
24
24
24
24
24
24
24
24
24
25
AD 728×90

Air Quality Index Trend

47h · 1 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. Current PM2.5 concentration in Watertown is 1.1× the WHO 24-hour guideline of 15 µg/m³.

96.5%
Humidity
76.4 km/h
Wind NNE
1012.7 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
60
16.31 µg/m³
PM10
25
27.45 µg/m³
050100150200300500

What is the weather forecast for Watertown?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.516.31 µg/m³ ×1.1 WHO
Moderate
PM1027.45 µg/m³
Good
UV INDEX4.4
Moderate
AD 300×250
Station readings (4 stations within 25 km)
16.31
Median
13.6
Average
10.6
Low
19.65
High
PM2.5 µg/m³ · Model: 13.7 · Bias: -2.6

What is the 7-day forecast for Watertown?

07-21
27.2° 18.8°
4.19 mm
07-22
22.7° 14.9°
9.25 mm
07-23
27.7° 16.7°
1.81 mm
07-24
26.5° 14.9°
2.31 mm
07-25
35.5° 20.6°
2.88 mm
07-26
23.5° 17.0°
1.63 mm
07-27
28.8° 14.9°
5.94 mm
Both models agree Avg diff: 3.6°C

Where are air quality stations near Watertown?

71
Magazine Beach Park
5.8 km PM2.5: 21.5 µg/m³ PM10: 22.5 µg/m³
53
Nubian Square - DEP Station
9.4 km PM2.5: 13.2 µg/m³
9
Boston Roxbury
9.5 km PM2.5: 2.2 µg/m³
52
Boston
10.2 km PM2.5: 12.6 µg/m³
42
Boston
10.2 km PM2.5: 10.1 µg/m³
21
Milton Blue Hill Observatory
18.6 km PM2.5: 5.0 µg/m³

What cities are near Watertown?

59 Belmont 62 Brighton 58 Waltham 60 Chestnut Hill 66 Allston 61 Cambridge 60 Brookline 58 Somerville 58 Mission Hill 60 Fenway/Kenmore
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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 2026-07-21T21:28 UTC.