Valence pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Valence is low; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass no longer expected, mugwort no longer expected.
7-Day Trend
Over the next week grass and mugwort will increase; cypress 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) | Low | 17/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 17/100 |
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
Valence's Parc Jouvet and the Rhône River corridor feature oak, plane, and linden as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Drôme farmland and Vercors massif woodland contribute substantial tree and grass pollen, while the Rhône valley channels airflows and the warm Rhône plain microclimate extends the season compared to surrounding upland areas.
Valence sits in the Rhône valley where the river channels airflows and the warm plain microclimate extends the season compared to surrounding upland areas. Hazel and alder open from January before birch and plane peak through April and May, with grass from surrounding Drôme farmland peaking through May and June. The Vercors massif contributes additional tree pollen when winds blow from the west.
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Frequently Asked Questions About Pollen in Auvergne-Rhône-Alpes
Is pollen high in Valence right now?
On 20 September 2026, overall pollen levels in Valence are low. Artemisia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Valence tomorrow?
On 21 September 2026, pollen conditions in Valence will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Valence this week?
According to the five-day outlook, artemisia and grass pollen levels will increase later in the week.
Which pollen types are currently active in Valence?
On 20 September 2026, Artemisia is the dominant pollen source in Valence. grass are also present but at lower levels. cypress and willow are not currently active.
When is pollen season in Valence?
How often is the Valence pollen forecast updated?
The Valence pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Valence 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 Valence 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 Valence, 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).
