The Toronto West AQHI station will experience a temporary interruption in public data reporting from Friday, April 10 to Sunday, April 12 due to scheduled maintenance activities. Air quality information from other Toronto monitoring stations will remain available.
Sunday, April 12, 2026, 8:00 am
Photo: Dorset Ambient Air Monitoring Site
| Station information | |
|---|---|
| Station name: | Dorset |
| Address: | 1026 Bellwood Acres Rd. |
| Latitude: | 45.224278 |
| Longitude: | -78.932944 |
| Station type: | Rural |
| Height of air intake: | 3 m |
| Elevation ASL: | 318 m |
| Pollutants measured: | O3, PM2.5 |
| Pollutant | Measured 1-hour concentration |
|---|---|
| O3 | 33 ppb![Ozone [O3]graph](/images/icon_trend_up.svg){kind=icon} |
| PM2.5 | 4 µg/m3 |
| Pollutant | Ontario 1-hour AAQC |
|---|---|
| O3 | 80 ppb |
Note: N/A (not available) denotes invalid or missing data.
