Västerås pollen forecast - today, tomorrow and the week ahead

On 25 June 2026, overall pollen levels in Västerås are moderate. Grass is the main contributor to airborne pollen, while cypress remain at lower levels

On 26 June 2026, pollen conditions in Västerås will be different from today, with birch at low levels and grass, cypress increasing

According to the five-day outlook, grass, birch, and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

On 25 June 2026, Grass is the dominant pollen source in Västerås. cypress are also present but at lower levels. willow, alder, birch, and hazel are not currently active.

Västerås' pollen season runs from February through August, opening with alder from February before birch peaks strongly through May. Grass follows through June and July. The Svartån River corridor and Lake Mälaren position mean lake breezes can periodically disperse pollen, while surrounding Västmanland farmland extends grass and crop pollen into August under the well-defined continental Swedish seasonal progression.

The Västerås 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 Västerås, 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.