Worst air pollution La Cite-Limoilou - Quebec City, today and tomorrow
Today (9 August): Air quality in La Cite-Limoilou is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 36.6/100).
Tomorrow (10 August 2026): Air quality in La Cite-Limoilou is fair. All pollutants stay as today. Pollution peaks around 11:00 AM (O3: 31.9/100). Airmine updates local air quality forecasts four times daily.
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La Cité-Limoilou's air quality reflects Quebec City's dense historic core, with pedestrian zones limiting traffic in Old Quebec while surrounding streets and the Dufferin-Montmorency Expressway contribute emissions.
Today - 9 August | Pollution peaks at 08:00
AQI:
Fair
36.6/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
8.8/100
NO2 (nitrogen dioxide):
Good
10.9/100
O3 (ozone):
Fair
36.6/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.7/100
PM1 (ultrafine particles):
Good
6.6/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 11:00
AQI:
Fair
31.9/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
6.2/100
NO2 (nitrogen dioxide):
Good
12.9/100
O3 (ozone):
Fair
31.9/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Good
5.5/100
Other Landmarks in Quebec City
Sports venues in Quebec City
Frequently Asked Questions
Is air quality bad in La Cite-Limoilou right now?
On 9 August 2026, overall air quality in La Cite-Limoilou is fair. AQI is the main air quality indicator at 36.6/100. Pollution peaks around 8:00 AM (O3: 36.6/100).
Will air quality be worse tomorrow in La Cite-Limoilou?
On 10 August 2026, air quality conditions in La Cite-Limoilou will be similar to today, with AQI forecast at fair at 31.9/100. Pollution peaks around 11:00 AM (O3: 31.9/100).
When is air pollution at its worst in La Cite-Limoilou?
La Cité-Limoilou sees clear seasonal swings in air quality, driven in part 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. Its position along the St. Lawrence River tends to moderate the sharpest seasonal extremes.
Are air quality levels in La Cite-Limoilou 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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