What is the air quality in Chelmsford?

Chelmsford, United Kingdom has an annual US AQI of 55 (Reasonable) and average PM2.5 of 11.7 µg/m³, ranking #1315 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Chelmsford?

August is typically the cleanest month (AQI 47) and March the most polluted (AQI 62).

Where does Chelmsford'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.

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

Chelmsford Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1315	Chelmsford, United Kingdom	Europe	AQI 55	PM2.5 11.7 µg/m³