Castro pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Castro is low; cypress and willow are low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress increasing, willow increasing.
7-Day Trend
Over the next week cypress and willow will decrease; grass 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) | Low | 3/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 2/100 |
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) | High | 65/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Moderate | 35/100 |
Local Environmental Conditions
Castro commands the Paraná highland campos region as the dairy capital of Paraná on the Iapó River, where native campo grassland, Araucaria pine, and eucalyptus are the main pollen sources on this elevated Segundo Planalto. The subtropical highland climate produces a well-defined pollen season, with grass from the native campos peaking in spring and summer and the Araucaria pine contributing a distinctive local pollen source throughout this Paraná highland dairy municipality.
Castro's pollen season follows the region's typical pattern, led by Araucaria pine and eucalyptus pollen, with exposure varying across the year according to local seasonal rainfall and temperature patterns.
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Frequently Asked Questions About Pollen in Paraná
Is pollen high in Castro right now?
On 20 September 2026, overall pollen levels in Castro are low. Willow is the main contributor to airborne pollen, while cypress remain at lower levels
Will pollen levels change in Castro tomorrow?
On 21 September 2026, pollen conditions in Castro will be different from today, with willow, cypress increasing
Is pollen expected to decrease in Castro this week?
According to the five-day outlook, willow and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Castro?
On 20 September 2026, Willow is the dominant pollen source in Castro. cypress are also present but at lower levels. grass are not currently active.
When is pollen season in Castro?
How often is the Castro pollen forecast updated?
The Castro pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Castro 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 Castro 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 Castro, 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).
