Worst air pollution Orillia, today and tomorrow
Today (16 July): Air quality in Orillia is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 37.0/100).
Tomorrow (17 July 2026): Air quality in Orillia is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 30.4/100). 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
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Orillia's air quality benefits from its position between two lakes at the gateway to Ontario's cottage country, with lake breezes providing reliable ventilation. Vehicle traffic on Highway 11 is the primary source.
Today - 16 July | Pollution peaks at 07:00
AQI:
Fair
37.0/100
PM2.5 (fine particles):
Good
5.7/100
PM10 (coarse particles):
Good
2.6/100
NO2 (nitrogen dioxide):
Good
1.6/100
O3 (ozone):
Fair
37.0/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
4.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
30.4/100
PM2.5 (fine particles):
Good
5.6/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
1.8/100
O3 (ozone):
Fair
30.4/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.4/100
PM1 (ultrafine particles):
Good
4.5/100
Pollen forecast in Orillia
View pollen forecastFrequently Asked Questions
Is air quality bad in Orillia right now?
On 16 July 2026, overall air quality in Orillia is fair. AQI is the main air quality indicator at 37.0/100. Pollution peaks around 7:00 AM (O3: 37.0/100).
Will air quality be worse tomorrow in Orillia?
On 17 July 2026, air quality conditions in Orillia will be similar to today, with AQI forecast at fair at 30.4/100. Pollution peaks around 8:00 AM (O3: 30.4/100).
When is air pollution at its worst in Orillia?
Seasonal air quality in Orillia is closely linked to its position between Lake Simcoe and Lake Couchiching. Air quality is typically excellent for much of the year, though summer weekends bring a rise in vehicle traffic from visitors, and occasional wildfire smoke can drift in during hot, dry stretches. Weekday air quality is often noticeably better than on busy summer weekends when visitor numbers peak.
Are air quality levels in Orillia 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