Worst air pollution Cap-de-la-Madeleine (secteur) - Trois-Rivières, today and tomorrow
Today (9 August): Air quality in Cap-de-la-Madeleine (secteur) is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 35.7/100).
Tomorrow (10 August 2026): Air quality in Cap-de-la-Madeleine (secteur) is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 35.4/100). Airmine updates local air quality forecasts four times daily.
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The Cap-de-la-Madeleine sector's air quality reflects its position within greater Trois-Rivières on the St. Lawrence, with vehicle traffic and the region's paper-mill legacy contributing local sources.
Today - 9 August | Pollution peaks at 08:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
13.4/100
PM10 (coarse particles):
Good
9.8/100
NO2 (nitrogen dioxide):
Fair
24.9/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Good
8.7/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 12:00
AQI:
Fair
35.4/100
PM2.5 (fine particles):
Good
12.8/100
PM10 (coarse particles):
Good
8.3/100
NO2 (nitrogen dioxide):
Fair
31.0/100
O3 (ozone):
Fair
35.4/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
8.7/100
Other Landmarks in Trois-Rivières
Sports venues in Trois-Rivières
Frequently Asked Questions
Is air quality bad in Cap-de-la-Madeleine (secteur) right now?
On 9 August 2026, overall air quality in Cap-de-la-Madeleine (secteur) is fair. AQI is the main air quality indicator at 35.7/100. Pollution peaks around 8:00 AM (O3: 35.7/100).
Will air quality be worse tomorrow in Cap-de-la-Madeleine (secteur)?
On 10 August 2026, air quality conditions in Cap-de-la-Madeleine (secteur) will be similar to today, with AQI forecast at fair at 35.4/100. Pollution peaks around 12:00 PM (O3: 35.4/100).
When is air pollution at its worst in Cap-de-la-Madeleine (secteur)?
Seasonal air quality in Cap-de-la-Madeleine (secteur) is closely linked to its riverside industry along the St. Lawrence. Summer heat can worsen conditions when plant emissions combine with sunlight to form ground-level ozone, while winter inversions occasionally trap industrial pollutants close to the ground on still, cold days. Wind direction off the harbour plays a large role in how far pollutants travel into surrounding neighbourhoods.
Are air quality levels in Cap-de-la-Madeleine (secteur) 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: 10 August 2026 at 02:34 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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