Worst air pollution Leslieville - Toronto, today and tomorrow
Today (16 July): Air quality in Leslieville is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 32.0/100).
Tomorrow (17 July 2026): Air quality in Leslieville is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 29.1/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Leslieville's air quality reflects its dense east-end Toronto character, with vehicle traffic on Queen Street East and the surrounding converted-industrial streets contributing the primary local emissions.
Today - 16 July | Pollution peaks at 10:00
AQI:
Fair
32.0/100
PM2.5 (fine particles):
Good
6.4/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
1.8/100
O3 (ozone):
Fair
32.0/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
4.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
29.1/100
PM2.5 (fine particles):
Good
4.9/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
1.9/100
O3 (ozone):
Fair
29.1/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
3.5/100
Other Landmarks in Toronto
Sports venues in Toronto
Frequently Asked Questions
Is air quality bad in Leslieville right now?
On 16 July 2026, overall air quality in Leslieville is fair. AQI is the main air quality indicator at 32.0/100. Pollution peaks around 10:00 AM (O3: 32.0/100).
Will air quality be worse tomorrow in Leslieville?
On 17 July 2026, air quality conditions in Leslieville will be similar to today, with AQI forecast at fair at 29.1/100. Pollution peaks around 8:00 AM (O3: 29.1/100).
When is air pollution at its worst in Leslieville?
Leslieville's air quality follows a seasonal rhythm tied to its mix of converted industrial buildings and busy east-end streets. Warmer months usually bring elevated ozone and haze as heat, sunlight and vehicle emissions interact, while cooler months bring a marked improvement, apart from occasional temperature inversions that trap pollutants near the surface overnight. Local monitoring stations typically flag the sharpest changes during still, hot afternoons in July and August.
Are air quality levels in Leslieville based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Check air quality in other popular cities:
Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app