Worst air pollution Quebec City, today and tomorrow
Today (16 July): Air quality in Quebec City 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 Quebec City 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
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Quebec City's air quality benefits from its St. Lawrence River valley position, with vehicle traffic on Highway 40 the primary local source amid generally good river-valley ventilation.
Today - 16 July | Pollution peaks at 06:00
AQI:
Medium
48.7/100
PM2.5 (fine particles):
Good
10.7/100
PM10 (coarse particles):
Good
3.9/100
NO2 (nitrogen dioxide):
Good
7.8/100
O3 (ozone):
Medium
48.7/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.4/100
PM1 (ultrafine particles):
Good
12.5/100
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
7.1/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Good
6.5/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
8.6/100
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Frequently Asked Questions
Is air quality bad in Quebec City right now?
On 16 July 2026, overall air quality in Quebec City 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 Quebec City?
On 17 July 2026, air quality conditions in Quebec City 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 Quebec City?
Air quality in Quebec City shifts noticeably across the seasons, shaped by its historic clifftop old town overlooking the St. Lawrence River. 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. The surrounding Greenbelt helps buffer some neighbourhoods, though downtown corridors still see the sharpest seasonal shifts.
Are air quality levels in Quebec City 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