Boulogne-Billancourt pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Boulogne-Billancourt 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 | 14/100 |
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 | 3/100 |
Local Environmental Conditions
Boulogne-Billancourt's parks and the Seine River corridor feature oak, plane, and linden as the main tree pollen sources, with exposure varying between green areas and the densely built city centre. As part of the greater Paris metropolitan area, local sources dominate, though surrounding Île-de-France farmland and the Bois de Boulogne contribute additional tree and grass pollen under prevailing westerly winds.
Boulogne-Billancourt's pollen season runs from January through August, opening with hazel and alder from January before birch and plane peak through April and May. Grass pollen peaks through June and July. As part of the greater Paris metropolitan area, the season mirrors that of the capital, with the Bois de Boulogne and the Seine corridor contributing local tree and grass pollen alongside broader Île-de-France farmland exposure.
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Frequently Asked Questions About Pollen in Île-de-France
Is pollen high in Boulogne-Billancourt right now?
On 20 September 2026, overall pollen levels in Boulogne-Billancourt are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Boulogne-Billancourt tomorrow?
On 21 September 2026, pollen conditions in Boulogne-Billancourt will be similar to today, with artemisia at low levels
Is pollen expected to decrease in Boulogne-Billancourt this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Boulogne-Billancourt?
On 20 September 2026, Artemisia is the dominant pollen source in Boulogne-Billancourt. cypress, grass, and willow are not currently active.
When is pollen season in Boulogne-Billancourt?
How often is the Boulogne-Billancourt pollen forecast updated?
The Boulogne-Billancourt pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Boulogne-Billancourt 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 Boulogne-Billancourt 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 Boulogne-Billancourt, 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).
