Locarno pollen forecast — Verzasca Valley neighborhood
Pollen Today
Today (20 September) pollen in Verzasca Valley, Locarno is low; grass is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass no longer expected.
7-Day Trend
Over the next week cypress, grass, willow, and mugwort 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) | Low | 14/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
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) | None | 0/100 |
Local Environmental Conditions
Verzasca Valley's setting near Locarno features chestnut, oak, and Mediterranean vegetation as the main pollen sources, with exposure varying between the valley's granite riverbed and the forested Ticino hillside slopes above.
Verzasca Valley's pollen timeline opens with hazel and alder in January, birch surges through April and May, chestnut and oak keep the tree season going, and grass takes over across June and July. This stretch south of the Alps tends to hold onto pollen during still, sun-warmed spells, while nearby chestnut forest and lakeside greenery keep contributing. The warm, sheltered southern Alpine microclimate means the season here starts earlier than in northern Swiss cities.
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Frequently Asked Questions About Pollen in Ticino
Is pollen high in Locarno right now?
On 20 September 2026, overall pollen levels in Locarno are low. Grass is the main contributor to airborne pollen
Will pollen levels change in Locarno tomorrow?
On 21 September 2026, pollen conditions in Locarno will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Locarno this week?
According to the five-day outlook, pollen levels are expected to remain relatively stable.
Which pollen types are currently active in Locarno?
On 20 September 2026, Grass is the dominant pollen source in Locarno. willow, artemisia, and cypress are not currently active.
When is pollen season in Locarno?
How often is the Locarno pollen forecast updated?
The Locarno pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Locarno 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 Locarno 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 Locarno, 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).
