Hornsby Heights Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (7 October): Air quality in Hornsby Heights is moderate. AQI and PM2.5 are moderate; PM10 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (PM2.5: 41.5/100).
Air Quality Tomorrow
Tomorrow (8 October 2026): Air quality in Hornsby Heights is moderate. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 AM (PM2.5: 44.9/100).
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Air Quality
Today - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 41.5/100 |
| PM2.5 (fine particles) | Moderate | 41.5/100 |
| PM10 (coarse particles) | Fair | 31.0/100 |
| NO2 (nitrogen dioxide) | Good | 12.0/100 |
| O3 (ozone) | Good | 10.5/100 |
| SO2 (sulfur dioxide) | Good | 2.2/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 2.3/100 |
| PM1 (ultrafine particles) | Good | 2.5/100 |
Tomorrow - 8 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 44.9/100 |
| PM2.5 (fine particles) | Moderate | 44.9/100 |
| PM10 (coarse particles) | Fair | 36.2/100 |
| NO2 (nitrogen dioxide) | Fair | 20.2/100 |
| O3 (ozone) | Good | 11.9/100 |
| SO2 (sulfur dioxide) | Good | 4.3/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 4.0/100 |
| PM1 (ultrafine particles) | Good | 4.9/100 |
Local Environmental Conditions
With little dense development around the heart of Hornsby Heights, local traffic emissions are modest. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation. Light average winds mean local emissions are not always carried away quickly. On some days, pollution drifting in from farther away outweighs local sources.
Summer sun from November to March cooks traffic fumes into ozone, especially in the warmest month, which averages 23°C. From June to August, cooler nights and lighter winds, with temperatures around 12°C, let traffic pollution linger near busy roads. From one day to the next, still, dry weather allows pollution to accumulate, and wind or rain clears it out.
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Frequently Asked Questions About Air Quality in New South Wales
Is air quality bad in Hornsby Heights right now?
On 7 October 2026, overall air quality in Hornsby Heights is moderate. AQI is the main air quality indicator at 41.5/100. Pollution peaks around 11:00 PM (PM2.5: 41.5/100).
Will air quality be worse tomorrow in Hornsby Heights?
On 8 October 2026, air quality conditions in Hornsby Heights will be similar to today, with AQI forecast at moderate at 44.9/100. Pollution peaks around 4:00 AM (PM2.5: 44.9/100).
When is air pollution at its worst in Hornsby Heights?
Summer sun from November to March cooks traffic fumes into ozone, especially in the warmest month, which averages 23°C. From June to August, cooler nights and lighter winds, with temperatures around 12°C, let traffic pollution linger near busy roads. From one day to the next, still, dry weather allows pollution to accumulate, and wind or rain clears it out.
Are air quality levels in Hornsby Heights 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. |