Worst air pollution Fremantle, today and tomorrow
Today (20 September): Air quality in Fremantle is moderate. AQI and PM2.5 are moderate; PM10 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (PM2.5: 40.0/100).
Tomorrow (21 September 2026): Air quality in Fremantle is fair. AQI improves to fair; PM2.5 decreases to fair; PM10 decreases to good; all other pollutants stay as today. Pollution peaks around 1:00 PM (PM2.5: 36.2/100). Airmine updates local air quality forecasts four times daily.
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As a working port city at the mouth of the Swan River, Fremantle benefits from the reliable Indian Ocean sea breeze known locally as the Fremantle Doctor, which flushes the air on all but the stillest days. Air quality is generally very good year-round, with low humidity typical of the region's Mediterranean climate. The main seasonal risk comes each summer, December through March, when bushfire smoke can drift in from the surrounding hills or further afield and temporarily reduce visibility. Port and shipping activity adds a modest industrial contribution, but consistent onshore winds usually prevent any real build-up of pollutants.
Today - 20 September | Pollution peaks at 00:00
AQI:
Moderate
40.0/100
PM2.5 (fine particles):
Moderate
40.0/100
PM10 (coarse particles):
Fair
21.0/100
NO2 (nitrogen dioxide):
Good
14.0/100
O3 (ozone):
Good
13.3/100
SO2 (sulfur dioxide):
Good
2.6/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
1.4/100
PM1 (ultrafine particles):
Good
5.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 13:00
AQI:
Fair
36.2/100
PM2.5 (fine particles):
Fair
36.2/100
PM10 (coarse particles):
Good
17.8/100
NO2 (nitrogen dioxide):
Good
17.8/100
O3 (ozone):
Good
13.1/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
9.2/100
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Frequently Asked Questions
Is air quality bad in Fremantle right now?
On 20 September 2026, overall air quality in Fremantle is moderate. AQI is the main air quality indicator at 40.0/100. Pollution peaks around 12:00 AM (PM2.5: 40.0/100).
Will air quality be worse tomorrow in Fremantle?
On 21 September 2026, air quality conditions in Fremantle will be better than today, with AQI forecast at fair at 36.2/100. Pollution peaks around 1:00 PM (PM2.5: 36.2/100).
When is air pollution at its worst in Fremantle?
In Fremantle, air quality typically takes its biggest hit during hot, dry summer stretches, when bushfire smoke occasionally interrupts otherwise excellent air quality. Beyond bushfire risk, steady sea breezes keep the air remarkably clear most of the year. Sensitive groups should watch forecasts during that period rather than assume year-round conditions apply.
Are air quality levels in Fremantle 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: 20 September 2026 at 14:33 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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