Outdoor
Consider keeping outdoor activity lighter until conditions improve.
Why: AQI or pollutant levels are elevated, so this guidance is more cautious.
Toronto, Canada
Toronto air quality today
Consider keeping outdoor activity lighter until conditions improve.
Air quality status: ModerateUpdated (city local time): 18 Jul 2026, 06:00Data: Open-Meteo current data
Practical guidance
Running
A lighter indoor option may be more comfortable today.
Why: Air quality indicators are elevated, so the running guidance is more cautious.
Ventilation
Consider waiting before longer ventilation.
Why: PM2.5, PM10, NO2 or ozone is elevated, so longer ventilation may bring more outdoor pollution indoors.
Air quality and outdoor metrics
US AQI
Air Quality Index
89
Moderate
PM2.5
Fine particulate matter
82.0µg/m³
High
PM10
Coarse particulate matter
84.1µg/m³
High
NO₂
Nitrogen dioxide
15µg/m³
Low
O₃
Ozone
73µg/m³
Moderate
UV index
Sun exposure level
0
Low
Pollen
Pollen availability
Not available
Not available
Temperature
Air temperature
20°C
Comfortable
Feels like
Apparent temperature
20°C
Comfortable
Wind
Wind speed
13km/h
Breezy
Humidity
Relative humidity
86%
Humid
Data source and license
Air quality and weather data provided by Open-Meteo. Air quality forecasts are based on CAMS air quality data. Values are general estimates and may not reflect street-level conditions.
Open-Meteo · Updated (city local time): 18 Jul 2026, 06:00
Some metrics from current data are unavailable: Pollen
Disclaimer
This information is a general estimate only and is not medical advice.
Location
Toronto, Canada
Coordinates: 43.6532, -79.3832 · America/Toronto
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.
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.