Air Quality in Watertown, United States
Windy
7.9°C · 80.4% humidity
7.9°
Feels 3.1°
32
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Watertown's air quality — share it
AQI Forecast
24
7am
24
24
32
10am
30
28
27
1pm
27
27
26
4pm
26
26
27
7pm
27
24
24
10pm
24
24
24
1am
24
24
24
4am
24
24
Air Quality Index Trend
33h · 1 stnWatertown'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 1.5× the WHO annual guideline of 5 µg/m³.
80.4%
Humidity
41.5 km/h
Wind NNE
1026.4 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.71 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Watertown?
Temperature & Precipitation
PM2.5 Trend
33h · 1 stationPM2.57.71 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
What is the 7-day forecast for Watertown?
05-29
20.4° 7.9°
0.81 mm
05-30
16.8° 7.7°
8.38 mm
05-31
20.1° 6.3°
0.06 mm
06-01
24.0° 13.4°
06-02
16.4° 10.4°
0.31 mm
06-03
22.6° 16.1°
1.44 mm
06-04
21.1° 11.8°
0.06 mm
Both models agree
Avg diff: 3.3°C
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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 2026-05-29T14:47 UTC.