What is the air quality in London?

London, Canada has an annual US AQI of 45 (Reasonable) and average PM2.5 of 8.6 µg/m³, ranking #465 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in London?

October is typically the cleanest month (AQI 38) and July the most polluted (AQI 53).

Where does London's air quality data come from?

PM2.5: 1998–2026 (monitors 2001, 2003–2026, satellite 1998–2000, 2002, 2010; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

London, Canada — Air Quality & Clean City Guide 2026

London Air Quality Data

Global rank	City	Continent	AQI	PM2.5
465	London, Canada	North America	AQI 45	PM2.5 8.6 µg/m³