Monitoring Air Quality
To support the Air Quality Health Index (AQHI), the Ministry monitors up to 6 common pollutants at each of the 38 stations across the provincial AQHI network, including:
- ozone
- fine particulate matter
- nitrogen dioxide
- sulphur dioxide
- carbon monoxide
- total reduced sulphur compounds
Ontario Air Quality Health Index Monitoring Network
| CITY/TOWN | O3 | PM2.5 | NO2 | SO2 | CO | TRS |
|---|---|---|---|---|---|---|
| Barrie | X | X | X | - | - | - |
| Belleville | X | X | X | - | - | - |
| Brampton | X | X | X | - | - | - |
| Brantford | X | X | X | - | - | - |
| Burlington | X | X | X | - | - | - |
| Chatham | X | X | X | - | - | - |
| Cornwall | X | X | X | - | - | - |
| Dorset | X | X | - | - | - | - |
| Grand Bend | X | X | X | - | - | - |
| Guelph | X | X | X | - | - | - |
| Hamilton Downtown | X | X | X | X | X | X |
| Hamilton Mountain | X | X | X | X | - | - |
| Hamilton West | X | X | X | - | - | - |
| Kingston | X | X | X | - | - | - |
| Kitchener | X | X | X | - | - | - |
| London | X | X | X | - | - | - |
| Milton | X | X | X | X | - | - |
| Mississauga | X | X | X | - | - | - |
| Newmarket | X | X | X | - | - | - |
| North Bay | X | X | X | - | - | - |
| Oakville | X | X | X | - | - | - |
| Oshawa | X | X | X | - | - | - |
| Ottawa Downtown | X | X | X | - | - | - |
| Parry Sound | X | X | X | - | - | - |
| Peterborough | X | X | X | - | - | - |
| Port Stanley | X | X | X | - | - | - |
| Sarnia | X | X | X | X | - | X |
| Sault Ste. Marie | X | X | X | X | - | - |
| St. Catharines | X | X | X | - | - | - |
| Sudbury | X | X | X | X | - | - |
| Thunder Bay | X | X | X | - | - | - |
| Tiverton | X | X | - | - | - | - |
| Toronto Downtown | X | X | X | - | - | - |
| Toronto East | X | X | X | - | - | - |
| Toronto North | X | X | X | X | X | - |
| Toronto West | X | X | X | X | X | - |
| Windsor Downtown | X | X | X | X | X | - |
| Windsor West | X | X | X | X | - | X |
For current AQHI information, please visit Air Quality Ontario, Environment and Climate Change Canada, or call the AQHI Reporting System line at: 416-246-0411 in the Toronto area or toll-free at 1-800-387-7768.
