Saint Charles pollen forecast - today, tomorrow and the week ahead

On 9 August 2026, overall pollen levels in Saint Charles are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels

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

According to the five-day outlook, ambrosia, artemisia, and grass 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 Saint Charles. artemisia are also present but at lower levels. cypress and grass are not currently active.

Along Poplar Creek, willow and alder are typically the first trees to shed pollen, with activity building through late winter into early March. The wooded areas near Poplar Creek Forest Preserve then carry the tree pollen load into its sharpest phase, typically centered on April and May. Nearby, around Tyler Creek and Brunner Family Forest Preserve, the same general pattern holds, shifted by only a few days in either direction.

The Saint Charles 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 Saint Charles, 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.