Sanctuaire du Cap-de-la-Madeleine, Trois-Rivières Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Sanctuaire du Cap-de-la-Madeleine is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 AM (O3: 11.0/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Sanctuaire du Cap-de-la-Madeleine is good. All pollutants stay as today. Pollution peaks around 4:00 PM (NO2: 14.9/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Good | 11.0/100 |
| PM2.5 (fine particles) | Good | 8.3/100 |
| PM10 (coarse particles) | Good | 10.9/100 |
| NO2 (nitrogen dioxide) | Good | 9.2/100 |
| O3 (ozone) | Good | 11.0/100 |
| SO2 (sulfur dioxide) | Good | 0.3/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 1.1/100 |
| PM1 (ultrafine particles) | Good | 4.5/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Good | 14.9/100 |
| PM2.5 (fine particles) | Good | 11.8/100 |
| PM10 (coarse particles) | Good | 14.4/100 |
| NO2 (nitrogen dioxide) | Good | 14.9/100 |
| O3 (ozone) | Good | 10.9/100 |
| SO2 (sulfur dioxide) | Good | 0.4/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 1.3/100 |
| PM1 (ultrafine particles) | Good | 7.8/100 |
Local Environmental Conditions
Around this location in Trois-Rivières, a mix of built-up land and open space means traffic is an important, but not overwhelming, local pollution source. In cold weather, wood burning and other home heating become a noticeable source of fine particles. Pockets of trees and green space help filter a small share of the particles from traffic. Open water nearby lets breezes move freely across the area, helping to disperse pollutants.
Particle levels tend to be highest from November to April, when home heating and traffic add more emissions and cold, calm spells at around -11°C slow their dispersal. By contrast, hot afternoons in July, averaging 21°C in the warmest month, are when ozone is most likely to build up. From one day to the next, still, dry weather allows pollution to accumulate, and wind or rain clears it out.
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Frequently Asked Questions About Air Quality in Quebec
Is air quality bad in Sanctuaire du Cap-de-la-Madeleine right now?
On 10 October 2026, overall air quality in Sanctuaire du Cap-de-la-Madeleine is good. AQI is the main air quality indicator at 11.0/100. Pollution peaks around 1:00 AM (O3: 11.0/100).
Will air quality be worse tomorrow in Sanctuaire du Cap-de-la-Madeleine?
On 11 October 2026, air quality conditions in Sanctuaire du Cap-de-la-Madeleine will be similar to today, with AQI forecast at good at 14.9/100. Pollution peaks around 4:00 PM (NO2: 14.9/100).
When is air pollution at its worst in Sanctuaire du Cap-de-la-Madeleine?
Particle levels tend to be highest from November to April, when home heating and traffic add more emissions and cold, calm spells at around -11°C slow their dispersal. By contrast, hot afternoons in July, averaging 21°C in the warmest month, are when ozone is most likely to build up. From one day to the next, still, dry weather allows pollution to accumulate, and wind or rain clears it out.
Are air quality levels in Sanctuaire du Cap-de-la-Madeleine 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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |