An air quality alert is currently in effect for select areas in Ontario.
Visit Environment and Climate Change Canada (ECCC) Weather Information for detailed information on the active alert.
Our website will be updated soon to reflect Environment and Climate Change Canada’s new colour coded alert system.
Thursday, March 5, 2026, 12:00 am
Photo: Hamilton Mountain Ambient Air Monitoring Site
| Station information | |
|---|---|
| Station name: | Hamilton Mountain |
| Address: | 250 Fennell Ave. W. |
| Latitude: | 43.241324 |
| Longitude: | -79.889328 |
| Station type: | Urban |
| Height of air intake: | 3 m |
| Elevation ASL: | 195 m |
| Pollutants measured: | O3, PM2.5, NO2, SO2 |
| Pollutant | Measured 1-hour concentration |
|---|---|
| O3 | 8 ppb![Ozone [O3]graph](/images/icon_trend_up.svg){kind=icon} |
| PM2.5 | 44 µg/m3 |
| NO2 | 20.8 ppb |
| SO2 | 0.5 ppb |
| Pollutant | Ontario 1-hour AAQC |
|---|---|
| O3 | 80 ppb |
| NO2 | 200 ppb |
| SO2 | 40 ppb |
Note: N/A (not available) denotes invalid or missing data.
