Altdorf pollen forecast — St. Gotthard Pass neighborhood

On 16 July 2026, overall pollen levels in Altdorf are moderate. Cypress is the main contributor to airborne pollen, while grass and willow remain at lower levels

On 17 July 2026, pollen conditions in Altdorf will be different from today, with grass at medium levels, willow at low levels and cypress continuing to decline

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

On 16 July 2026, Cypress is the dominant pollen source in Altdorf. grass and willow are also present but at lower levels. alder, artemisia, birch, and hazel are not currently active.

St. Gotthard Pass' pollen calendar is short, largely confined to June through August, when larch and alpine meadow grasses dominate the lower approaches to this high setting. The lowland tree pollen calendar barely applies here, since vegetation cover thins out quickly with altitude, leaving only sparse pollen sources near the summit.

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

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.

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 Altdorf, 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.