Castricum pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in Castricum is medium; grass is medium. Tomorrow (17 July 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

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

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Local tree pollen in Castricum traces mainly to oak, birch, and linden in parks and gardens, and levels shift depending on how close residents are to parks versus the built-up core. Given Castricum's standing as a wooded dune village, the coastal dune reserve and nearby Noord-Holland farmland add noticeably to grass and tree pollen levels.

Today - 16 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    29/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    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 - 17 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    26/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

Air quality in Castricum

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Frequently Asked Questions

Is pollen high in Castricum right now?

On 16 July 2026, overall pollen levels in Castricum are moderate. Grass is the main contributor to airborne pollen

Will pollen levels change in Castricum tomorrow?

On 17 July 2026, pollen conditions in Castricum will be similar to today, with grass at medium levels

Is pollen expected to decrease in Castricum this week?

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

Which pollen types are currently active in Castricum?

On 16 July 2026, Grass is the dominant pollen source in Castricum. alder, artemisia, birch, hazel, cypress, and willow are not currently active.

When is pollen season in Castricum?
The pollen calendar in Castricum opens in January with hazel and alder, shifts to birch dominance through April, and continues to August. Oak and ash pollen build through April and May, handing off to grass as the leading source in June and July. Local dispersal is influenced by the coastal dune reserve, and Bergen and the PWN dune water-catchment area is characteristic of Castricum and its surroundings.
How often is the Castricum pollen forecast updated?

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

Does pollen in Castricum 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 Castricum 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 Castricum, 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 Netherlands?

Almere Amsterdam Breda Eindhoven Groningen Nijmegen Rotterdam The Hague Tilburg Utrecht

Check pollen in other popular cities:

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

Data provided by Airmine — Last update: 16 July 2026 at 05:36 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Castricum.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

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