Zastron pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Zastron is moderate; eucalyptus is moderate; cypress, oak, mugwort, mulberry, plane, and nettle are low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort remains low, nettle remains low, cypress increasing, eucalyptus increasing, oak increasing, mulberry increasing, plane increasing.
7-Day Trend
Over the next week cypress, eucalyptus, oak, mugwort, mulberry, plane, and nettle will decrease; grass will remain stable.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Low | 11/100 |
| Eucalyptus (Myrtaceae) | Moderate | 37/100 |
| Grass (Poaceae) | None | 0/100 |
| Oak (Quercus) | Low | 13/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 4/100 |
| Mulberry (Morus) | Low | 25/100 |
| Plane (Platanus) | Low | 11/100 |
| Nettle (Urtica) | Low | 2/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | Moderate | 32/100 | |
| Eucalyptus (Myrtaceae) | High | 56/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Oak (Quercus) | Moderate | 34/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 23/100 | |
| Mulberry (Morus) | Moderate | 49/100 | |
| Plane (Platanus) | Moderate | 30/100 | |
| Nettle (Urtica) | Low | 20/100 |
Local Environmental Conditions
Zastron lies roughly 160 km south-southeast of Bloemfontein. Around Zastron, the vegetation is a patchwork of eucalyptus, acacia, and introduced oak in the older streets, thinning out into open Highveld grassland once you leave the built-up core, with maize, sunflower, and grain farming operations occupying much of that outer land. This split between wooded town and open plateau shapes exposure block by block.
Grass and acacia dominate the pollen picture at Zastron, with the season opening in August and peaking through October and November as Highveld grassland flowers. The dry winter months are largely pollen-free, while the surrounding maize, sunflower, and grain farming operations defines much of the land beyond the town itself, a pattern typical of the wider Highveld region.
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Frequently Asked Questions About Pollen in Free State
Is pollen high in Zastron right now?
On 20 September 2026, overall pollen levels in Zastron are moderate. Myrtle is the main contributor to airborne pollen, while oak, urtica, artemisia, cypress, morus, and platanus remain at lower levels
Will pollen levels change in Zastron tomorrow?
On 21 September 2026, pollen conditions in Zastron will be different from today, with urtica at low levels, artemisia at low levels and oak, cypress, morus, myrtle, platanus increasing
Is pollen expected to decrease in Zastron this week?
According to the five-day outlook, oak, urtica, artemisia, cypress, morus, myrtle, and platanus pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Zastron?
On 20 September 2026, Myrtle is the dominant pollen source in Zastron. oak, urtica, artemisia, cypress, morus, and platanus are also present but at lower levels. grass are not currently active.
When is pollen season in Zastron?
How often is the Zastron pollen forecast updated?
The Zastron pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Zastron 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 Zastron 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 Zastron, 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. |
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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).
