Rosa Brook pollen forecast — Brown Hill Estate neighborhood
Pollen Today
Today (20 September) pollen in Brown Hill Estate, Rosa Brook is low; acacia, cypress, eucalyptus, and grass are low.
Pollen Tomorrow
Tomorrow (21 September 2026) acacia remains low, cypress remains low, grass remains low, eucalyptus no longer expected.
7-Day Trend
Over the next week acacia, cypress, eucalyptus, and grass will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Acacia (Acacia) | Low | 23/100 |
| Cypress (Cupressaceae) | Low | 20/100 |
| Eucalyptus (Myrtaceae) | Low | 10/100 |
| Grass (Poaceae) | Low | 20/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Acacia (Acacia) | Low | 13/100 | |
| Cypress (Cupressaceae) | Low | 10/100 | |
| Eucalyptus (Myrtaceae) | None | 0/100 | |
| Grass (Poaceae) | Low | 10/100 |
Local Environmental Conditions
River oak grows along the bank here, releasing fine wind-borne pollen typical of casuarina species; this sits close to this spot. A stand of eucalypt with wattle through the understorey, wattle ranked among the region's sharpest allergens, within easy reach. The broader area tends to mirror this pattern, with only minor local variation.
Along the waterway, river oak releases pollen first, building through the depths of winter into September. The nearby eucalypt and wattle stands take the lead as winter turns to spring, cresting around August and September in the year's sharpest tree-pollen spike. Spring brings rising grass pollen that crests in November, with the season extending well into summer before finally winding down in February.
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Frequently Asked Questions About Pollen in Western Australia
Is pollen high in Rosa Brook right now?
On 20 September 2026, overall pollen levels in Rosa Brook are low. Acacia is the main contributor to airborne pollen, while cypress, myrtle, and grass remain at lower levels
Will pollen levels change in Rosa Brook tomorrow?
On 21 September 2026, pollen conditions in Rosa Brook will be different from today, with acacia at low levels, cypress at low levels, grass at low levels
Is pollen expected to decrease in Rosa Brook this week?
According to the five-day outlook, acacia, cypress, myrtle, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Rosa Brook?
On 20 September 2026, Acacia is the dominant pollen source in Rosa Brook. cypress, myrtle, and grass are also present but at lower levels.
When is pollen season in Rosa Brook?
How often is the Rosa Brook pollen forecast updated?
The Rosa Brook pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Rosa Brook 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 Rosa Brook 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 Rosa Brook, 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).
