What is the air quality in Colchester?

Colchester, United Kingdom has an annual US AQI of 56 (Reasonable) and average PM2.5 of 12.1 µg/m³, ranking #1440 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Colchester?

August is typically the cleanest month (AQI 48) and March the most polluted (AQI 65).

Where does Colchester's air quality data come from?

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

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

Colchester Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1440	Colchester, United Kingdom	Europe	AQI 56	PM2.5 12.1 µg/m³