Sydney pollen forecast — Hornsby neighborhood
Pollen Today
Today (16 September) pollen in Hornsby, Sydney is low; acacia, cypress, and eucalyptus are low.
Pollen Tomorrow
Tomorrow (17 September 2026) acacia increasing, cypress increasing, eucalyptus increasing.
7-Day Trend
Over the next week acacia, cypress, and eucalyptus will decrease; grass will remain stable.
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Pollen Risk
Today - 16 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Low | 6/100 |
| Cypress (Cupressaceae) | Low | 21/100 |
| Eucalyptus (Myrtaceae) | Low | 13/100 |
| Grass (Poaceae) | None | 0/100 |
Tomorrow - 17 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | Moderate | 29/100 | |
| Cypress (Cupressaceae) | Moderate | 44/100 | |
| Eucalyptus (Myrtaceae) | Moderate | 37/100 | |
| Grass (Poaceae) | None | 0/100 |
Local Environmental Conditions
Hornsby, on Sydney's upper north shore sandstone plateau, is bordered by extensive Sydney blue gum high forest and turpentine-ironbark bushland in deep, moist gullies, among the most significant remnant native forest close to the city. Suburban gardens carry both native and exotic plantings. This extensive surrounding bushland gives Hornsby one of the strongest eucalypt pollen signatures of any Sydney suburb, particularly during the spring flowering of blue gum and turpentine.
Hornsby's position amid the bushland of the upper north shore, bordering Ku-ring-gai Chase National Park, gives it a strong tree pollen presence from surrounding eucalypt forest, peaking August-September, alongside grass pollen from suburban lawns and ovals through October-December. The area's elevation and extensive bushland cover mean tree pollen plays a larger relative role here than in Sydney's more built-up, low-lying suburbs. Cool valley air pooling overnight in the district's gullies can hold pollen close to the ground until midmorning.
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Frequently Asked Questions About Pollen in New South Wales
Is pollen high in Sydney right now?
On 16 September 2026, overall pollen levels in Sydney are low. Acacia is the main contributor to airborne pollen, while cypress and myrtle remain at lower levels
Will pollen levels change in Sydney tomorrow?
On 17 September 2026, pollen conditions in Sydney will be different from today, with acacia, cypress, myrtle increasing
Is pollen expected to decrease in Sydney this week?
According to the five-day outlook, acacia, cypress, and myrtle pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Sydney?
On 16 September 2026, Acacia is the dominant pollen source in Sydney. cypress and myrtle are also present but at lower levels. grass are not currently active.
When is pollen season in Sydney?
How often is the Sydney pollen forecast updated?
The Sydney pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Sydney come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Sydney based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Sydney, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
