Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI and low pollutant levels support this guidance.
Toronto, Canada
Toronto air quality today
Current values look suitable for ordinary outdoor activity for most people.
Data: Hourly Open-Meteo model estimateThe latest update is older than expected, so this page is showing an estimate for the current hour.Detailed metrics and guidance use the latest available detailed data.
Practical guidance
Running
Current values look suitable for an easy outdoor run.
Why: Low AQI and low pollutant levels support this guidance.
Ventilation
Current values support brief ventilation.
Why: Low AQI and low pollutant levels support brief ventilation.
Official AQHI forecast
Official public AQHI period forecast. This is a forecast, not a current observation.
Forecast area: Toronto
Issued: 5 Sept 2026, 05:00 pm
AQHI uses a 1–10+ scale. Higher values mean greater health risk: 1–3 low, 4–6 moderate, 7–10 high, and 10+ very high. Each value is the forecast maximum for that period.
Valid for: Tonight
- AQHI
- 2Low risk
Valid for: Tomorrow
- AQHI
- 2Low risk
Valid for: Tomorrow Night
- AQHI
- 3Low risk
Valid for: Day 3
- AQHI
- 3Low risk
Environment and Climate Change Canada
Source: Environment and Climate Change Canada. Reuse does not imply endorsement by the Government of Canada.
Air quality and outdoor metrics
US AQI
Air Quality Index
42
Good
PM2.5
Fine particulate matter
3.9µg/m³
Low
PM10
Coarse particulate matter
3.9µg/m³
Low
NO₂
Nitrogen dioxide
16µg/m³
Low
O₃
Ozone
58µg/m³
Low
UV index
Sun exposure level
0
Low
Temperature
Air temperature
20°C
Comfortable
Feels like
Apparent temperature
20°C
Comfortable
Wind
Wind speed
11km/h
Light
Humidity
Relative humidity
84%
Humid
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Disclaimer
This information is a general estimate only and is not medical advice.
Location
Toronto, Canada
Coordinates: 43.6532, -79.3832 · America/Toronto
Interpret AQI for outdoor activity
Calculic's European AQI calculator assesses the value using your population group and planned activity intensity.
Interpret AQI in CalculicThis page's European AQI value, city and timestamp are passed to the calculator through the link.
What affects air quality in Toronto
The City of Toronto identifies traffic-related air pollution as Toronto's largest local source of air pollution.
This is evergreen citywide source context, not a statement about today's conditions or the provenance of the current US AQI shown here.
Local monitoring and context
Ontario's AQHI monitoring network lists four Toronto stations—Downtown, East, North and West—and monitors ozone, PM2.5 and nitrogen dioxide at each.
This describes Ontario's official AQHI monitoring context. It does not source the current US AQI model estimate or replace the separate official AQHI forecast on this page.
City air quality FAQ
How should I read the AQI for Toronto?
US AQI condenses air quality into one value. On this page, it helps you quickly judge whether conditions look good, moderate or more polluted than usual.
Is the air quality good for going outside?
Check the outdoor and running cards first. They combine AQI, particles, ozone, weather and other factors that can affect outdoor comfort.
Should I ventilate right now?
The ventilation card considers AQI and pollutants such as particles, nitrogen dioxide and ozone. If values are elevated, a shorter opening or a later moment may be better.
Why can air quality change during the day?
Weather, emissions, ozone formation, particles and air flow can shift local conditions, so the next hours can differ from the current reading.
Sources and methodology
Current data
This page uses US AQI.
Current and hourly air-quality values are CAMS-based model estimates, not measurements from a local monitoring station. They may not reflect street-level conditions.
- Displayed state
- This hour's model estimate
- Data time
- 5 Sept 2026, 09:00 pm
- Data source
- Open-Meteo
The latest update is older than expected, so this page is showing an estimate for the current hour.
Detailed metrics and guidance use the latest available detailed data.
Evergreen city statements
Each local statement is linked to a checked primary-authority source. A source check is editorial provenance and does not describe current-data freshness.
Local sources support the background claims below; they are not the source of the current data shown above unless explicitly stated otherwise.
Authoritative sources for local statements
Air Pollution
City of Toronto
- Scope
- Toronto
- Source checked
- 22 Aug 2026
Under ‘The sources of Toronto's air pollution’, identifies traffic-related air pollution as Toronto's largest local source.
Applicability: City of Toronto source inventory; the traffic statement is city-scoped and is not a current reading or forecast.
Based on this source: The City of Toronto identifies traffic-related air pollution as Toronto's largest local source of air pollution.
Monitoring air quality
Ontario Ministry of the Environment, Conservation and Parks
- Scope
- Toronto AQHI monitoring stations
- Source checked
- 22 Aug 2026
The Ontario AQHI network table lists Toronto Downtown, East, North and West and shows ozone, PM2.5 and nitrogen dioxide at all four.
Applicability: Official AQHI network inventory for Toronto stations; it is separate from this page's current US AQI model estimate and official AQHI forecast product.
Based on this source: Ontario's AQHI monitoring network lists four Toronto stations—Downtown, East, North and West—and monitors ozone, PM2.5 and nitrogen dioxide at each.