Watertown Real-time Air Quality Index (AQI) & Pollen Report - Air Matters

Watertown

Middlesex County, Massachusetts

2026-05-21 21:00

AQI (US)

Good

Pollutants|Pollens

PM10

μg/m³

40

PM2.5

μg/m³

3.7

Weather

18℃

45%

9 kph

1 of 11

Historical Data

Data Sources

http://www.airnow.gov/

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