Worst air pollution Portland, today and tomorrow
Today (10 August): Air quality in Portland is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 17.2/100).
Tomorrow (11 August 2026): Air quality in Portland is good. All pollutants stay as today. Pollution peaks around 12:00 AM (O3: 17.2/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Home to Victoria's only aluminium smelter, Portland's air quality is distinctively shaped by industrial emissions from this major point source, alongside strong, near-constant coastal winds off Portland Bay that generally disperse pollutants quickly across this exposed southwest Victorian port town. Southwest Victoria's frequent, unimpeded Southern Ocean winds mean pollutants from the smelter rarely linger for long, though occasional still, cold winter mornings can allow localised industrial haze to build before dispersing. Agricultural dust from surrounding grazing land is a minor additional factor compared with more cropping-intensive districts inland.
Today - 10 August | Pollution peaks at 23:00
AQI:
Good
17.2/100
PM2.5 (fine particles):
Good
7.9/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Good
17.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.5/100
PM1 (ultrafine particles):
Good
1.2/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 00:00
AQI:
Good
17.2/100
PM2.5 (fine particles):
Good
6.1/100
PM10 (coarse particles):
Good
2.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Good
17.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
1.5/100
Pollen forecast in Portland
View pollen forecastFrequently Asked Questions
Is air quality bad in Portland right now?
On 10 August 2026, overall air quality in Portland is good. AQI is the main air quality indicator at 17.2/100. Pollution peaks around 11:00 PM (O3: 17.2/100).
Will air quality be worse tomorrow in Portland?
On 11 August 2026, air quality conditions in Portland will be similar to today, with AQI forecast at good at 17.2/100. Pollution peaks around 12:00 AM (O3: 17.2/100).
When is air pollution at its worst in Portland?
Air quality is most affected on the rare occasions when wind direction carries smelter emissions toward residential areas rather than out to sea; otherwise the strong, persistent coastal winds typical of this exposed stretch of coastline keep the town's air clear most of the year.
Are air quality levels in Portland 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: 9 August 2026 at 20:27 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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