Bellevue pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Bellevue is low; grass is low. Tomorrow (26 June 2026) levels are similar. Over the following five days grass will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Bellevue's Seine River waterfront and street tree corridors 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 surrounding Île-de-France farmland contributes additional grass and tree pollen under prevailing westerly winds.

Today - 25 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    25/100

  • Willow (Salicaceae):

    None

    0/100

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 - 26 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    22/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Bellevue right now?

On 25 June 2026, overall pollen levels in Bellevue are low. Grass is the main contributor to airborne pollen

Will pollen levels change in Bellevue tomorrow?

On 26 June 2026, pollen conditions in Bellevue will be similar to today, with grass at low levels

Is pollen expected to decrease in Bellevue this week?

According to the five-day outlook, grass pollen levels are expected to gradually decrease, while cypress pollen will increase, suggesting mixed conditions later in the week.

Which pollen types are currently active in Bellevue?

On 25 June 2026, Grass is the dominant pollen source in Bellevue. alder, birch, hazel, cypress, and willow are not currently active.

When is pollen season in Bellevue?
Bellevue's Seine valley position in the greater Paris area connects it to the metropolitan pollen landscape. Hazel and alder open from January before birch and plane peak through April and May, with grass peaking through June and July. The urban heat island extends the season at both ends, while the dry Île-de-France climate means fewer rainfall interruptions than in Atlantic-facing French cities throughout.
How often is the Bellevue pollen forecast updated?

The Bellevue pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in Bellevue 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 Bellevue 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 Bellevue, 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?

Bordeaux Lille Lyon Marseille Montpellier Nantes Nice Paris Strasbourg Toulouse

Check pollen in other popular cities:

Sydney Rio de Janeiro Copenhagen Paris Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

Data provided by Airmine — Last update: 25 Jun 2026, 09:02 CET (Data is updated four times daily.)

This page provides the latest public pollen forecast for Bellevue.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.