What is the air quality in Ottawa?

Ottawa, Canada has an annual US AQI of 37 (Reasonable) and average PM2.5 of 6.3 µg/m³, ranking #181 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Ottawa?

October is typically the cleanest month (AQI 28) and July the most polluted (AQI 44).

Where does Ottawa's air quality data come from?

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

Ottawa, Canada — Air Quality & Clean City Guide 2026

Ottawa Air Quality Data

Global rank	City	Continent	AQI	PM2.5
181	Ottawa, Canada	North America	AQI 37	PM2.5 6.3 µg/m³