Toronto Air Quality Index
Toronto, Canada · Real-time AQI data
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Pollutant Breakdown
PM2.5
61µg/m³
O₃
19.2ppm
NO₂
22.3ppb
SO₂
0.2ppb
CO
1.9ppm
Station: Toronto · Mar 17, 06:00 PM · Updates every 30 min
Health Recommendations
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
How does Toronto compare to other cities?
Compare →AQI Scale Reference
About Air Quality in Toronto
The Air Quality Index (AQI) in Toronto is measured using monitoring stations that track six key pollutants: PM2.5, PM10, ground-level ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide. The AQI is calculated using US EPA standards and ranges from 0 (excellent) to 500 (hazardous).
PM2.5 is typically the dominant pollutant in Toronto during high-pollution periods. Fine particulate matter from traffic, industry, and seasonal factors can push AQI above 150, which is considered unhealthy for all groups.
Check the health effects guide to understand what today's AQI means for your activity level, or see the global AQI rankings to compare Toronto with other cities worldwide.