La Roche-sur-Yon pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in La Roche-sur-Yon is medium; mugwort is medium. Tomorrow (10 August 2026) levels are similar - mugwort increasing, grass at low levels. Over the following five days grass and mugwort will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

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La Roche-sur-Yon's Parc Napoleon and the Yon River corridor feature oak, birch, and linden as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Vendée farmland and bocage woodland contribute substantial tree and grass pollen, while the Yon valley channels airflows and concentrates pollen across the planned Vendée capital throughout the season.

Today - 9 August

  • 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):

    Medium

    45/100

High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.

Tomorrow - 10 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    7/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    High

    60/100

Air quality in La Roche-sur-Yon

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Frequently Asked Questions

Is pollen high in La Roche-sur-Yon right now?

On 9 August 2026, overall pollen levels in La Roche-sur-Yon are moderate. Artemisia is the main contributor to airborne pollen

Will pollen levels change in La Roche-sur-Yon tomorrow?

On 10 August 2026, pollen conditions in La Roche-sur-Yon will be different from today, with grass at low levels and artemisia increasing

Is pollen expected to decrease in La Roche-sur-Yon this week?

According to the five-day outlook, artemisia and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

Which pollen types are currently active in La Roche-sur-Yon?

On 9 August 2026, Artemisia is the dominant pollen source in La Roche-sur-Yon. hazel, cypress, grass, and willow are not currently active.

When is pollen season in La Roche-sur-Yon?
La Roche-sur-Yon's Vendée bocage setting channels airflows and concentrates pollen across the planned capital city. Hazel and alder open from January before birch and oak peak through April and May. Grass from surrounding Vendée farmland peaks through June and July, while the Atlantic oceanic climate means frequent rainfall provides regular interruptions and the Yon valley concentrates pollen under calm conditions.
How often is the La Roche-sur-Yon pollen forecast updated?

The La Roche-sur-Yon pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in La Roche-sur-Yon 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 La Roche-sur-Yon 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 La Roche-sur-Yon, 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.

Want to see pollen forecasts for other cities in France?

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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for La Roche-sur-Yon.

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Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.