Sartrouville pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Sartrouville is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
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 | 11/100 |
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) | Low | 2/100 |
Local Environmental Conditions
Sartrouville's Seine River waterfront and the Forêt de Saint-Germain fringe feature plane, oak, and linden as the main tree pollen sources, with exposure varying between these areas and the densely built suburban landscape. As part of the greater Paris metropolitan area, local sources dominate, while the Seine valley channels airflows and the nearby Forêt de Saint-Germain contributes locally significant tree pollen during spring.
Sartrouville's Seine valley position and the nearby Forêt de Saint-Germain make it one of the greener parts of the western Paris suburbs. Hazel and alder open from January before birch and plane peak through April and May, with grass peaking through June and July. The Seine corridor channels airflows, while the Forêt de Saint-Germain contributes locally significant tree pollen during spring.
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Frequently Asked Questions About Pollen in Île-de-France
Is pollen high in Sartrouville right now?
On 20 September 2026, overall pollen levels in Sartrouville are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Sartrouville tomorrow?
On 21 September 2026, pollen conditions in Sartrouville will be similar to today, with artemisia at low levels
Is pollen expected to decrease in Sartrouville this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Sartrouville?
On 20 September 2026, Artemisia is the dominant pollen source in Sartrouville. grass, willow, and cypress are not currently active.
When is pollen season in Sartrouville?
How often is the Sartrouville pollen forecast updated?
The Sartrouville pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Sartrouville 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 Sartrouville 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 Sartrouville, 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).
