Worst air pollution Chinatown Montreal - Montréal, today and tomorrow

On 30 August 2026, overall air quality in Chinatown Montreal is good. AQI is the main air quality indicator at 18.8/100. Pollution peaks around 1:00 PM (O3: 18.8/100).

On 31 August 2026, air quality conditions in Chinatown Montreal will be similar to today, with AQI forecast at good at 19.7/100. Pollution peaks around 8:00 AM (O3: 19.7/100).

Chinatown Montréal's air quality follows a seasonal rhythm tied to its dense downtown market streets. Summer tends to bring the year's worst stretches, as heat and traffic combine to push ground-level ozone and smog higher on stagnant days. Winter generally offers cleaner air, though cold snaps can trap exhaust and wood smoke closer to the ground on calm nights. A day of rain or wind usually clears things up quickly.

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.

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.