Château-Gontier pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Château-Gontier is high; mugwort is high.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort declining.
7-Day Trend
Over the next week mugwort will decrease; 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) | High | 58/100 |
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 | 48/100 |
Local Environmental Conditions
Around Château-Gontier, green spaces along the Vilaine feature oak and plane as the dominant tree pollen sources, with exposure varying across the town. Loire valley and Vendee farmland nearby contribute meaningful grass and crop pollen exposure, and the oceanic climate creates some local variation in exposure through the season.
Château-Gontier sees its pollen season begin in late winter, with hazel and alder the first to appear, with oak and plane rising to a peak by mid-spring, before the season closes with grass from Vendee farmland through early summer, a pattern typical of the oceanic climate here.
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Frequently Asked Questions About Pollen in Pays de la Loire
Is pollen high in Château-Gontier right now?
On 20 September 2026, overall pollen levels in Château-Gontier are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Château-Gontier tomorrow?
On 21 September 2026, pollen conditions in Château-Gontier will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Château-Gontier 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 Château-Gontier?
On 20 September 2026, Artemisia is the dominant pollen source in Château-Gontier. cypress, grass, and willow are not currently active.
When is pollen season in Château-Gontier?
How often is the Château-Gontier pollen forecast updated?
The Château-Gontier pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Château-Gontier 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-Gontier 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-Gontier, 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).
