Freeport pollen forecast — Deer Hills neighborhood
Pollen Today
Today (20 September) pollen in Deer Hills, Freeport is moderate; ragweed is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed declining.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 33/100 |
Tomorrow - 21 September
| 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 | 24/100 |
Local Environmental Conditions
Deer Hills — Located within 139m of this spot, this area has the riverbank shelters hazel and willow, two trees whose pollen travels readily on the breeze. Oak and birch dominating the treeline, both heavy contributors to the spring pollen load; this sits just 139m from here. A park combining lawn grass and planted trees, both minor but real contributors to pollen here, about 590 meters off.
Near the bank, hazel and willow lead the seasonal calendar, usually peaking sometime between late winter and the end of March. The nearby oak and birch stands take the lead as spring progresses, usually peaking from April into May. Grass pollen builds through late spring and peaks in June, before ragweed takes over as the dominant allergen from mid-August through October.
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Frequently Asked Questions About Pollen in Illinois
Is pollen high in Freeport right now?
On 20 September 2026, overall pollen levels in Freeport are moderate. Ambrosia is the main contributor to airborne pollen
Will pollen levels change in Freeport tomorrow?
On 21 September 2026, pollen conditions in Freeport will be different from today, with ambrosia continuing to decline
Is pollen expected to decrease in Freeport this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Freeport?
On 20 September 2026, Ambrosia is the dominant pollen source in Freeport. artemisia and grass are not currently active.
When is pollen season in Freeport?
How often is the Freeport pollen forecast updated?
The Freeport pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Freeport 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 Freeport 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 Freeport, 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 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
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).
