Worst air pollution GPO Colonnade - Sydney, today and tomorrow

On 17 September 2026, overall air quality in GPO Colonnade is moderate. AQI is the main air quality indicator at 45.9/100. Pollution peaks around 10:00 PM (NO2: 45.9/100).

On 18 September 2026, air quality conditions in GPO Colonnade will be worse than today, with AQI forecast at poor at 72.4/100. Pollution peaks around 8:00 PM (NO2: 72.4/100).

This part of the city typically experiences its worst air quality during the coldest months, as reduced winter air mixing lets traffic and heating emissions accumulate close to the ground. As the weather warms and fire risk rises, smoke haze typically overtakes everyday traffic pollution as the top concern here, with summer's combination of heat, dry vegetation, and traffic emissions driving both ozone and periodic bushfire smoke.

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.