Harrismith pollen forecast — Sterkfontein Dam Nature Reserve neighborhood
Pollen Today
Today (20 September) pollen in Sterkfontein Dam Nature Reserve, Harrismith is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort no longer expected.
7-Day Trend
Over the next week mugwort will increase; cypress, eucalyptus, grass, oak, mulberry, plane, and nettle 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) | None | 0/100 |
| Eucalyptus (Myrtaceae) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Oak (Quercus) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 14/100 |
| Mulberry (Morus) | None | 0/100 |
| Plane (Platanus) | None | 0/100 |
| Nettle (Urtica) | None | 0/100 |
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) | None | 0/100 | |
| Eucalyptus (Myrtaceae) | None | 0/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Oak (Quercus) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Mulberry (Morus) | None | 0/100 | |
| Plane (Platanus) | None | 0/100 | |
| Nettle (Urtica) | None | 0/100 |
Local Environmental Conditions
Sterkfontein Dam Nature Reserve lies roughly 290 km east-northeast of Bloemfontein. Grassland, acacia, and eucalyptus make up most of the vegetation at Sterkfontein Dam Nature Reserve, with denser tree cover in older residential streets giving way to open country beyond town. The district's maize, sunflower, and grain farming operations adds to the mix, and grass pollen becomes the dominant source once summer rains set in, consistent with the wider Highveld plateau environment.
Sterkfontein Dam Nature Reserve sees its first tree pollen from acacia and eucalyptus in August, with Highveld grass following as the dominant source through October and November. The dry winter keeps things quiet until then, and the district's maize, sunflower, and grain farming operations means exposure varies between greener pockets and more built-up ground, a pattern typical of the wider Highveld region.
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Frequently Asked Questions About Pollen in Free State
Is pollen high in Harrismith right now?
On 20 September 2026, overall pollen levels in Harrismith are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Harrismith tomorrow?
On 21 September 2026, pollen conditions in Harrismith will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Harrismith this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Harrismith?
On 20 September 2026, Artemisia is the dominant pollen source in Harrismith. grass, oak, urtica, cypress, morus, myrtle, and platanus are not currently active.
When is pollen season in Harrismith?
How often is the Harrismith pollen forecast updated?
The Harrismith pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Harrismith 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 Harrismith 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 Harrismith, 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).
