Château-Thierry pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Château-Thierry 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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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 | 3/100 |
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
Château-Thierry's parks and the Deule corridor feature birch and oak as the main tree pollen sources, with exposure varying between green areas and the more built-up centre. Surrounding Picardy and Artois arable plains contribute substantial grass and scrub pollen, while the cool oceanic climate shapes how pollen disperses across the town.
Château-Thierry opens its pollen year with hazel and alder appearing from late January, and progresses through birch and oak from April into May, before grass from arable plains rounds out the season into summer, consistent with the wider cool oceanic character of the region.
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Frequently Asked Questions About Pollen in Hauts-de-France
Is pollen high in Château-Thierry right now?
On 20 September 2026, overall pollen levels in Château-Thierry are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Château-Thierry tomorrow?
On 21 September 2026, pollen conditions in Château-Thierry will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Château-Thierry this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Château-Thierry?
On 20 September 2026, Artemisia is the dominant pollen source in Château-Thierry. cypress, grass, and willow are not currently active.
When is pollen season in Château-Thierry?
How often is the Château-Thierry pollen forecast updated?
The Château-Thierry pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Château-Thierry 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 Château-Thierry 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 Château-Thierry, 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).
