Thornhill Air Quality
Current air-quality information for Thornhill, Canada.
Air quality is generally considered satisfactory.
World Air Quality Index Project (WAQI) · Updated 2026-10-15T14:00:00-05:00Health context
At the current AQI of 18, Thornhill is in the Good category on the displayed AQI scale. Most people can continue normal outdoor activities. Current pollutant values shown for Thornhill are PM2.5 9 µg/m³, O₃ 18.4 µg/m³, NO₂ 2.7 µg/m³. The current reading is identified on this page as World Air Quality Index Project (WAQI).
Air-quality information is not medical advice. People with asthma, heart or lung disease, children, older adults and other sensitive groups may need to take additional precautions when pollution is elevated.
Recent History & Forecast
This chart shows atmospheric-model AQI history and forecast from Open-Meteo / Copernicus Atmosphere Monitoring Service (CAMS) model. It is separate from any monitoring-station observation shown in the Current AQI card.
What does AQI 18 mean in Thornhill?
Thornhill currently has an AQI of 18, which falls in the Good category. This indicates relatively low overall air pollution on the displayed AQI scale. Normal outdoor activity is generally appropriate for most people. The pollutant values currently shown for Thornhill are PM2.5 9 µg/m³, O₃ 18.4 µg/m³, NO₂ 2.7 µg/m³. The displayed current conditions are identified as World Air Quality Index Project (WAQI).
Nearby cities
- Richmond Hill air quality — approximately 6 km away
- Vaughan air quality — approximately 6 km away
- Markham air quality — approximately 14 km away
- Toronto air quality — approximately 18 km away
- Etobicoke air quality — approximately 22 km away
- Pickering air quality — approximately 25 km away
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