Worst air pollution Montréal, today and tomorrow
Today (16 July): Air quality in Montréal 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: 36.7/100).
Tomorrow (17 July 2026): Air quality in Montréal is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 30.9/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Montréal's air quality reflects its St. Lawrence River island position, with vehicle traffic on the 20 and 40 the primary local source. Summer humidity and industrial East End refineries elevate ozone on hot days.
Today - 16 July | Pollution peaks at 07:00
AQI:
Fair
36.7/100
PM2.5 (fine particles):
Good
6.0/100
PM10 (coarse particles):
Good
2.3/100
NO2 (nitrogen dioxide):
Good
12.0/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
5.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
30.9/100
PM2.5 (fine particles):
Good
7.5/100
PM10 (coarse particles):
Good
2.7/100
NO2 (nitrogen dioxide):
Good
11.7/100
O3 (ozone):
Fair
30.9/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.9/100
PM1 (ultrafine particles):
Good
6.5/100
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Frequently Asked Questions
Is air quality bad in Montréal right now?
On 16 July 2026, overall air quality in Montréal is fair. AQI is the main air quality indicator at 36.7/100. Pollution peaks around 7:00 AM (O3: 36.7/100).
Will air quality be worse tomorrow in Montréal?
On 17 July 2026, air quality conditions in Montréal will be similar to today, with AQI forecast at fair at 30.9/100. Pollution peaks around 8:00 AM (O3: 30.9/100).
When is air pollution at its worst in Montréal?
Montréal's air quality follows a seasonal rhythm tied to its dense island core, heavy traffic and mix of downtown high-rises and industry. The warmest months typically see the poorest air quality, with heat and heavy traffic driving up smog levels on windless days, whereas fall and winter tend to bring cleaner, more variable conditions. A day of rain or wind usually clears things up quickly.
Are air quality levels in Montréal 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.
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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