What is the air quality in Cardiff?

Cardiff, United Kingdom has an annual US AQI of 51 (Reasonable) and average PM2.5 of 10.7 µg/m³, ranking #902 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Cardiff?

July is typically the cleanest month (AQI 42) and March the most polluted (AQI 61).

Where does Cardiff's air quality data come from?

PM2.5: 1998–2026 (monitors 2008–2026, satellite 1998–2008, 2011–2012, 2015, 2018–2019, 2023, model 2025; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

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

Cardiff Air Quality Data

Global rank	City	Continent	AQI	PM2.5
902	Cardiff, United Kingdom	Europe	AQI 51	PM2.5 10.7 µg/m³