Worst air pollution Vieux-Quebec - Quebec City, today and tomorrow
Today (16 July): Air quality in Vieux-Quebec is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 48.7/100).
Tomorrow (17 July 2026): Air quality in Vieux-Quebec is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 34.1/100). 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.
Vieux-Québec's air quality reflects the city's dense historic core, with pedestrian zones limiting through-traffic while surrounding streets and tourist coaches contribute background emissions to this walled landmark district.
Today - 16 July | Pollution peaks at 06:00
AQI:
Medium
48.7/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
2.4/100
O3 (ozone):
Medium
48.7/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.4/100
PM1 (ultrafine particles):
Good
11.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 11:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
6.5/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
2.0/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
7.9/100
Other Landmarks in Quebec City
Sports venues in Quebec City
Frequently Asked Questions
Is air quality bad in Vieux-Quebec right now?
On 16 July 2026, overall air quality in Vieux-Quebec is medium. AQI is the main air quality indicator at 48.7/100. Pollution peaks around 6:00 AM (O3: 48.7/100).
Will air quality be worse tomorrow in Vieux-Quebec?
On 17 July 2026, air quality conditions in Vieux-Quebec will be worse than today, with AQI forecast at fair at 34.1/100. Pollution peaks around 11:00 AM (O3: 34.1/100).
When is air pollution at its worst in Vieux-Quebec?
Vieux-Québec sees clear seasonal swings in air quality, driven in part by its fortified old-town streets overlooking the St. Lawrence. 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. Breezes off the St. Lawrence River help disperse pollutants more quickly here than in inland areas.
Are air quality levels in Vieux-Quebec 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