Hillarys, Perth Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (7 October): Air quality in Hillarys is moderate. AQI and PM2.5 are moderate; PM10 and PM1 are fair; NO2, O3, SO2, CO, and HCHO are good. Pollution peaks around 1:00 AM (PM2.5: 40.5/100).
Air Quality Tomorrow
Tomorrow (8 October 2026): Air quality in Hillarys is fair. AQI improves to fair; PM2.5 decreases to fair; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 11:00 AM (PM2.5: 38.8/100).
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Air Quality
Today - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 40.5/100 |
| PM2.5 (fine particles) | Moderate | 40.5/100 |
| PM10 (coarse particles) | Fair | 21.3/100 |
| NO2 (nitrogen dioxide) | Good | 4.8/100 |
| O3 (ozone) | Good | 14.2/100 |
| SO2 (sulfur dioxide) | Good | 1.1/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 2.3/100 |
| PM1 (ultrafine particles) | Fair | 23.6/100 |
Tomorrow - 8 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Fair | 38.8/100 |
| PM2.5 (fine particles) | Fair | 38.8/100 |
| PM10 (coarse particles) | Fair | 28.1/100 |
| NO2 (nitrogen dioxide) | Good | 2.8/100 |
| O3 (ozone) | Good | 13.4/100 |
| SO2 (sulfur dioxide) | Good | 0.6/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.6/100 |
| PM1 (ultrafine particles) | Good | 2.5/100 |
Local Environmental Conditions
With buildings covering much of the area around this part of Perth, traffic and other urban emissions are the biggest local influence on air quality. Its position by the Indian Ocean brings breezes that often clear pollutants away. Pockets of trees and green space help filter a small share of the particles from traffic. Pollution carried in from the wider region can also raise levels at times.
Hot afternoons from December to April, averaging 24°C in the warmest month, are when ozone is most likely to build up. In contrast, cooler, still evenings from July to September, averaging about 16°C, tend to hold exhaust close to busy streets. On the plus side, stronger winds around December, about 25 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 Western Australia
Is air quality bad in Hillarys right now?
On 7 October 2026, overall air quality in Hillarys is moderate. AQI is the main air quality indicator at 40.5/100. Pollution peaks around 1:00 AM (PM2.5: 40.5/100).
Will air quality be worse tomorrow in Hillarys?
On 8 October 2026, air quality conditions in Hillarys will be better than today, with AQI forecast at fair at 38.8/100. Pollution peaks around 11:00 AM (PM2.5: 38.8/100).
When is air pollution at its worst in Hillarys?
Hot afternoons from December to April, averaging 24°C in the warmest month, are when ozone is most likely to build up. In contrast, cooler, still evenings from July to September, averaging about 16°C, tend to hold exhaust close to busy streets. On the plus side, stronger winds around December, about 25 km/h on average, usually bring some of the cleanest air of the year.
Are air quality levels in Hillarys 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. |