Downers Grove Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Downers Grove is moderate; mold (cladosporium) is moderate; grass, mugwort, ragweed, and mold (alternaria) are low.
Pollen Tomorrow
Tomorrow (12 October 2026) ragweed remains low, mold (alternaria) remains low, mold (cladosporium) remains moderate, grass no longer expected, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase; mold (alternaria) and mold (cladosporium) will decrease.
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Pollen Risk
Today - 11 October
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Low | 7/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 7/100 |
| Ragweed (Ambrosia) | Low | 11/100 |
| Mold (Alternaria) | Low | 16/100 |
| Mold (Cladosporium) | Moderate | 38/100 |
Tomorrow - 12 October
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 5/100 | |
| Mold (Alternaria) | Low | 11/100 | |
| Mold (Cladosporium) | Moderate | 27/100 |
Local Environmental Conditions
The heart of Downers Grove is surrounded mainly by woodland, which covers around 51% of the nearby area, with a good deal of built-up land. Close to running water, riverside trees such as poplar contribute to what is in the air. Of the allergenic trees nearby, oak matters most, while maple also contributes. Grass pollen is significant here, and ragweed contributes weed pollen.
Tree pollen peaks in late spring, when the weather warms to around 15°C and oak and maple are in full flower. Grasses take over in early summer, with temperatures around 20°C, and their pollen lingers into early fall. The season closes with ragweed from late summer into mid-fall. Summer is the wettest time of year, and heavy showers can bring short breaks in pollen.
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Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in Illinois
Is pollen high in Downers Grove right now?
On 11 October 2026, overall pollen levels in Downers Grove are low. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Downers Grove tomorrow?
On 12 October 2026, pollen conditions in Downers Grove will be different from today, with ambrosia at low levels
Is pollen expected to decrease in Downers Grove this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Downers Grove?
On 11 October 2026, Grass is the dominant pollen source in Downers Grove. ambrosia and artemisia are also present but at lower levels.
When is pollen season in Downers Grove?
How often is the Downers Grove pollen forecast updated?
The Downers Grove pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Downers Grove come from nearby or far away?
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.
Are pollen levels in Downers Grove based on measurements or forecasts?
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 Downers 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.
Understanding the Scale
The 0–100 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
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Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
