Air Quality in Canada

Air quality can vary considerably across Canada because weather, local emissions, geography and regional transport can change from place to place and from day to day. AirQualityIndex.org monitors air-quality information from more than 25,000 monitoring locations worldwide. This country comparison page currently lists 86 major cities and locations across Canada, including Ottawa, Toronto, Vancouver, Montreal. Each listed location links to its own detailed air-quality page, while locations outside this comparison catalogue can be explored through Air Quality Near Me.

Use the search and filters to focus on a city type or AQI category, then sort the table by AQI, PM2.5, PM10, ozone (O₃), nitrogen dioxide (NO₂), data source or update time. Select any city to open its detailed air-quality page. Current values may include model-derived estimates and, where enabled, monitoring-station information; the displayed source should be considered when interpreting the results. The comparison catalogue is intentionally smaller than the wider AirQualityIndex.org monitoring-location database so the page remains fast and easy to use.