Ridderkerk pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Ridderkerk is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week grass and mugwort will increase; cypress 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 | 6/100 |
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 | 23/100 |
Local Environmental Conditions
Ridderkerk's parks and green spaces are dominated by oak, birch, and linden as the main tree pollen sources, and levels shift depending on how close residents are to parks versus the built-up core. the Nieuwe Maas and Noord rivers and the surrounding Zuid-Holland farmland add substantial grass and tree pollen to the mix, especially given Ridderkerk's role as a river-delta industrial town.
Ridderkerk sees its first pollen of the year from hazel and alder in January, with birch taking the lead through April and the season extending to August. Oak and ash step in during April and May, after which grass becomes the standout source over June and July. The presence of the Nieuwe Maas and Noord rivers nearby affects how pollen moves through the air, and the Rotterdam port hinterland is a distinctive feature of the Ridderkerk area.
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Frequently Asked Questions About Pollen in Zuid-Holland
Is pollen high in Ridderkerk right now?
On 20 September 2026, overall pollen levels in Ridderkerk are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Ridderkerk tomorrow?
On 21 September 2026, pollen conditions in Ridderkerk will be similar to today, with artemisia at low levels
Is pollen expected to decrease in Ridderkerk 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 Ridderkerk?
On 20 September 2026, Artemisia is the dominant pollen source in Ridderkerk. willow, cypress, and grass are not currently active.
When is pollen season in Ridderkerk?
How often is the Ridderkerk pollen forecast updated?
The Ridderkerk pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Ridderkerk 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 Ridderkerk 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 Ridderkerk, 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).
