What is the air quality in London?

London, United Kingdom has an annual US AQI of 52 (Reasonable) and average PM2.5 of 11.2 µg/m³, ranking #1023 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in London?

July is typically the cleanest month (AQI 44) and March the most polluted (AQI 60).

Where does London's air quality data come from?

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

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

London Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1023	London, United Kingdom	Europe	AQI 52	PM2.5 11.2 µg/m³