Air quality in Toronto today
Canada · Updated Thursday 20:00 (local time) · Model data from the Copernicus Atmosphere Monitoring Service
Fair European AQI
Fine for almost everyone.
Pollutants right now
| Pollutant | Value | Level |
|---|---|---|
| PM2.5 | 4 µg/m³ | Good |
| PM10 | 4 µg/m³ | Good |
| NO₂ | 17 µg/m³ | Good |
| O₃ | 67 µg/m³ | Fair |
The pollutant that matters most in Toronto right now is O₃.
Forecast: next 24 hours
Over the next 24 hours the air in Toronto is expected to be worst around Thu 23:00 (AQI 44, moderate). The cleanest hour is expected around Fri 10:00.
| Time | AQI | Level | PM2.5 |
|---|---|---|---|
| Thu 21:00 | 36 | Fair | 5 |
| Fri 00:00 | 44 | Moderate | 8 |
| Fri 03:00 | 40 | Fair | 8 |
| Fri 06:00 | 27 | Fair | 5 |
| Fri 09:00 | 27 | Fair | 8 |
| Fri 12:00 | 33 | Fair | 7 |
| Fri 15:00 | 42 | Moderate | 6 |
| Fri 18:00 | 34 | Fair | 5 |
The last 30 days
Over the last 30 days the average daily AQI in Toronto was 34, with 0 day(s) rated poor or worse. The cleanest day was 19 Sept, the most polluted 1 Sept.
Questions and answers
- Is the air in Toronto good today?
- Right now the European Air Quality Index in Toronto is 29, which is fair. Fine for almost everyone.
- What pollutes the air in Toronto?
- At the moment O₃ contributes most to the air quality index in Toronto. The index takes the worst of fine particles (PM2.5), coarser particles (PM10), nitrogen dioxide, ozone and sulphur dioxide.
- When will the air in Toronto be cleanest?
- Over the next 24 hours the air in Toronto is expected to be worst around Thu 23:00 (AQI 44, moderate). The cleanest hour is expected around Fri 10:00.
- Where does this data come from?
- Wheezair shows model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), served by Open-Meteo: about 11 km resolution in Europe and 40 km elsewhere, updated daily. They are not station measurements, so a busy street can be worse than its city's value.