What is the air quality in Watford?

Watford, United Kingdom has an annual US AQI of 53 (Reasonable) and average PM2.5 of 10.9 µg/m³, ranking #1060 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Watford?

August is typically the cleanest month (AQI 45) and March the most polluted (AQI 61).

Where does Watford's air quality data come from?

PM2.5: 1998–2026 (monitors 2022–2026, satellite 1998–2022; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Watford, United Kingdom — Air Quality & Clean City Guide 2026

Watford Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1060	Watford, United Kingdom	Europe	AQI 53	PM2.5 10.9 µg/m³