Halifax pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Halifax is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing.
7-Day Trend
Over the next week mugwort will decrease; cypress, grass, and willow will remain stable.
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Features and forecast availability vary by region.
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) | Low | 1/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 30/100 |
Local Environmental Conditions
Halifax's parks and green spaces feature rowan and birch as the main tree pollen sources, with exposure varying between these greener areas and the more built-up town centre. The nearby parkland nearby is a notable secondary source, feeding pollen into town whenever the wind shifts to the south. It's a pattern shared by plenty of similarly sized towns nearby, shaped more by geography than anything unusual locally.
The tree pollen story in Halifax is really about rowan and birch, in that order. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. Rowan gets going around May and tapers off by June, with birch picking up between March and May. Something to plan around if pollen usually gets to you.
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Frequently Asked Questions About Pollen in Calderdale
Is pollen high in Halifax right now?
On 20 September 2026, overall pollen levels in Halifax are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Halifax tomorrow?
On 21 September 2026, pollen conditions in Halifax will be different from today, with artemisia increasing
Is pollen expected to decrease in Halifax this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Halifax?
On 20 September 2026, Artemisia is the dominant pollen source in Halifax. cypress, grass, and willow are not currently active.
When is pollen season in Halifax?
How often is the Halifax pollen forecast updated?
The Halifax pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Halifax 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 Halifax 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 Halifax, 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).
