Heilbronn pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Heilbronn 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, grass, 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) | Low | 10/100 |
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) | None | 0/100 |
Local Environmental Conditions
Heilbronn's parks and green spaces rely mainly on maple, chestnut, and linden as the main tree pollen sources, with exposure varying between these areas and the more built-up centre. Surrounding Swabian farmland and valley-floor orchards contribute substantial tree and grass pollen, while the sheltered valley floor can hold pollen under calm, still air.
Heilbronn's pollen season stretches across January to August, beginning with early alder and hazel in early January with birch peaking through April and May. Grass pollen peaks next, running through June and July. The Neckar valley and surrounding Swabian farmland around Heilbronn combine vineyards, orchards, and arable fields, contributing fruit-tree and grass pollen as the season progresses.
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Frequently Asked Questions About Pollen in Baden-Württemberg
Is pollen high in Heilbronn right now?
On 20 September 2026, overall pollen levels in Heilbronn are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Heilbronn tomorrow?
On 21 September 2026, pollen conditions in Heilbronn will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Heilbronn this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Heilbronn?
On 20 September 2026, Artemisia is the dominant pollen source in Heilbronn. cypress, grass, and willow are not currently active.
When is pollen season in Heilbronn?
How often is the Heilbronn pollen forecast updated?
The Heilbronn pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Heilbronn 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 Heilbronn 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 Heilbronn, 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).
