Belfast pollen forecast — Cave Hill Country Park neighborhood
Pollen Today
Today (20 September) pollen in Cave Hill Country Park, Belfast is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing, grass at low levels.
7-Day Trend
Over the next week grass and mugwort will decrease; cypress and willow 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 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 31/100 |
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 | |
| Grass (Poaceae) | Low | 25/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | High | 62/100 |
Local Environmental Conditions
Residents in Cave Hill Country Park dealing with hay fever usually point to oak and ash as the culprits, particularly in spring near parks and gardens. Surrounding Belfast farmland contributes substantial grass and tree pollen, moving into town when winds blow from the south-west. Overall exposure follows the broader regional trend, moderated somewhat by the town's parks and gardens.
In Cave Hill Country Park, the pollen calendar starts with oak and rolls straight into ash. After that, grass pollen carries the season from May through to September, with June and July normally the toughest stretch. You'll usually see oak pollen from around April through May, with ash picking up between March and May. Handy to bear in mind before booking that garden party.
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Frequently Asked Questions About Pollen in Belfast
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
Will pollen levels change in Belfast tomorrow?
On 21 September 2026, pollen conditions in Belfast will be different from today, with grass at low levels and artemisia increasing
Is pollen expected to decrease in Belfast this week?
According to the five-day outlook, artemisia and grass pollen levels are expected to gradually decrease, suggesting improving 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. cypress, grass, and willow 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. |
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).
