Cote-des-Neiges-Notre-Dame-de-Grace, Montréal Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Cote-des-Neiges-Notre-Dame-de-Grace is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (NO2: 18.5/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Cote-des-Neiges-Notre-Dame-de-Grace is moderate. AQI worsens to moderate; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 4:00 PM (NO2: 41.4/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Good | 18.5/100 |
| PM2.5 (fine particles) | Good | 11.6/100 |
| PM10 (coarse particles) | Good | 11.7/100 |
| NO2 (nitrogen dioxide) | Good | 18.5/100 |
| O3 (ozone) | Good | 11.7/100 |
| SO2 (sulfur dioxide) | Good | 0.5/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 1.3/100 |
| PM1 (ultrafine particles) | Good | 5.4/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 41.4/100 |
| PM2.5 (fine particles) | Good | 17.7/100 |
| PM10 (coarse particles) | Good | 16.4/100 |
| NO2 (nitrogen dioxide) | Moderate | 41.4/100 |
| O3 (ozone) | Good | 11.6/100 |
| SO2 (sulfur dioxide) | Good | 0.4/100 |
| CO (carbon monoxide) | Good | 0.7/100 |
| HCHO (formaldehyde) | Good | 1.8/100 |
| PM1 (ultrafine particles) | Good | 10.4/100 |
Local Environmental Conditions
This site in Montréal is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. In cold weather, wood burning and other home heating become a noticeable source of fine particles. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation. Air arriving from elsewhere in the region adds to what is produced locally.
Cold spells from November to April, at around -9°C on average, are when smoke from home heating and traffic lingers longest. By contrast, hot afternoons from July to August, averaging 23°C in the warmest month, are when ozone is most likely to build up. On the plus side, stronger winds around March, about 20 km/h on average, usually bring some of the cleanest air of the year.
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Frequently Asked Questions About Air Quality in Quebec
Is air quality bad in Cote-des-Neiges-Notre-Dame-de-Grace right now?
On 10 October 2026, overall air quality in Cote-des-Neiges-Notre-Dame-de-Grace is good. AQI is the main air quality indicator at 18.5/100. Pollution peaks around 4:00 PM (NO2: 18.5/100).
Will air quality be worse tomorrow in Cote-des-Neiges-Notre-Dame-de-Grace?
On 11 October 2026, air quality conditions in Cote-des-Neiges-Notre-Dame-de-Grace will be worse than today, with AQI forecast at moderate at 41.4/100. Pollution peaks around 4:00 PM (NO2: 41.4/100).
When is air pollution at its worst in Cote-des-Neiges-Notre-Dame-de-Grace?
Cold spells from November to April, at around -9°C on average, are when smoke from home heating and traffic lingers longest. By contrast, hot afternoons from July to August, averaging 23°C in the warmest month, are when ozone is most likely to build up. On the plus side, stronger winds around March, about 20 km/h on average, usually bring some of the cleanest air of the year.
Are air quality levels in Cote-des-Neiges-Notre-Dame-de-Grace 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. |