Glen Ellyn pollen forecast - today, tomorrow and the week ahead

On 9 August 2026, overall pollen levels in Glen Ellyn are low. Ambrosia is the main contributor to airborne pollen

On 10 August 2026, pollen conditions in Glen Ellyn will be different from today, with grass at medium levels, artemisia at medium levels and ambrosia increasing

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

On 9 August 2026, Ambrosia is the dominant pollen source in Glen Ellyn. cypress, grass, and artemisia are not currently active.

The earliest pollen of the year here tends to come from willow and alder growing along the DuPage River, most active from late February through March. Hardwoods around Blackwell Forest Preserve follow, pushing tree pollen to its height through April and into May. The stretch between Salt Creek and Salt Creek Woods typically mirrors this timing fairly closely. Grass pollen rises through late spring, usually cresting sometime in June.

The Glen Ellyn 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 Glen Ellyn, 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.