What is the air quality in Belfast?

Belfast, United Kingdom has an annual US AQI of 47 (Reasonable) and average PM2.5 of 9.5 µg/m³, ranking #586 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Belfast?

August is typically the cleanest month (AQI 35) and March the most polluted (AQI 57).

Where does Belfast's air quality data come from?

PM2.5: 1998–2026 (monitors 2008–2026, satellite 1998–2008, 2011, 2013, 2019; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

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

Belfast Air Quality Data

Global rank	City	Continent	AQI	PM2.5
586	Belfast, United Kingdom	Europe	AQI 47	PM2.5 9.5 µg/m³