What is the air quality in Hamilton?

Hamilton, Canada has an annual US AQI of 49 (Reasonable) and average PM2.5 of 9.6 µg/m³, ranking #681 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Hamilton?

October is typically the cleanest month (AQI 41) and July the most polluted (AQI 55).

Where does Hamilton's air quality data come from?

PM2.5: 1998–2026 (monitors 2011–2026, satellite 1998–2010; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Hamilton, Canada — Air Quality & Clean City Guide 2026

Hamilton Air Quality Data

Global rank	City	Continent	AQI	PM2.5
681	Hamilton, Canada	North America	AQI 49	PM2.5 9.6 µg/m³