Leland Grove pollen forecast - today, tomorrow and the week ahead

On 9 August 2026, overall pollen levels in Leland Grove are high. Artemisia is the main contributor to airborne pollen, while ambrosia and grass remain at lower levels

On 10 August 2026, pollen conditions in Leland Grove will be similar to today, with grass at low levels, ambrosia at medium levels, artemisia at high levels

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, Artemisia is the dominant pollen source in Leland Grove. ambrosia and grass are also present but at lower levels. cypress are not currently active.

The earliest pollen of the year here tends to come from willow and alder growing along the Spoon River, most active from late February through March. Tree pollen peaks next around Starved Rock area woodlots, where oak and hickory dominate the canopy through most of April and May. The stretch between Big Bureau Creek and Rock Run Rookery Preserve typically mirrors this timing fairly closely.

The Leland Grove 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 Leland Grove, 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.