Hillerød pollen forecast - today, tomorrow and the week ahead

On 16 July 2026, overall pollen levels in Hillerød are moderate. Grass is the main contributor to airborne pollen, while cypress remain at lower levels

On 17 July 2026, pollen conditions in Hillerød will be different from today, with cypress at low levels, grass at medium levels, artemisia at low levels

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

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

Hillerød's pollen season begins with hazel in January and shifts to birch through April and May, the town's many mature parks amplifying the birch peak noticeably. Grass follows in June and July. Being inland and surrounded by forest rather than open coast, Hillerød sees less wind-driven dispersal than Denmark's coastal towns.

The Hillerød 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 Hillerød, 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.