Belfast pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Belfast is moderate; mugwort and mulberry are moderate; cypress, eucalyptus, and plane are low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress remains low, eucalyptus remains low, mugwort remains moderate, plane remains low, mulberry declining.
7-Day Trend
Over the next week cypress, eucalyptus, mulberry, and plane will increase; mugwort will decrease; grass, oak, 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) | Low | 25/100 |
| Eucalyptus (Myrtaceae) | Low | 21/100 |
| Grass (Poaceae) | None | 0/100 |
| Oak (Quercus) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 33/100 |
| Mulberry (Morus) | Moderate | 26/100 |
| Plane (Platanus) | Low | 15/100 |
| 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) | Low | 18/100 | |
| Eucalyptus (Myrtaceae) | Low | 14/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Oak (Quercus) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 26/100 | |
| Mulberry (Morus) | Low | 19/100 | |
| Plane (Platanus) | Low | 8/100 | |
| Nettle (Urtica) | None | 0/100 |
Local Environmental Conditions
Belfast lies roughly 100 km west-southwest of Nelspruit. Belfast's Highveld setting features eucalyptus, acacia, and introduced oak as the main tree pollen sources alongside open grassland, with exposure varying between greener residential areas and the more built-up corridors. Surrounding grassland and farmland contribute substantial grass pollen through summer, a mix shaped locally by maize, sunflower, and grain farming operations, consistent with the wider Highveld plateau environment.
Dust and dry air define the Belfast winter until acacia and eucalyptus break the pattern in August, setting up a grass-dominated October-November peak amid maize, sunflower, and grain farming operations. Once the plateau's summer thunderstorms establish themselves, pollen and airborne dust both settle down considerably. This mirrors the broader seasonal pattern seen across much of the Highveld region.
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Frequently Asked Questions About Pollen in Mpumalanga
Is pollen high in Belfast right now?
On 20 September 2026, overall pollen levels in Belfast are moderate. Artemisia is the main contributor to airborne pollen, while morus, myrtle, platanus, and cypress remain at lower levels
Will pollen levels change in Belfast tomorrow?
On 21 September 2026, pollen conditions in Belfast will be different from today, with myrtle at low levels, platanus at low levels, artemisia at moderate levels, cypress at low levels and morus continuing to decline
Is pollen expected to decrease in Belfast this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while myrtle, platanus, cypress, and morus pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Belfast?
On 20 September 2026, Artemisia is the dominant pollen source in Belfast. morus, myrtle, platanus, and cypress are also present but at lower levels. grass, oak, and urtica are not currently active.
When is pollen season in Belfast?
How often is the Belfast pollen forecast updated?
The Belfast pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Belfast 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 Belfast 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 Belfast, 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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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).
