Boulder Hill pollen forecast — Prescott Mill neighborhood
Pollen Today
Today (20 September) pollen in Prescott Mill, Boulder Hill is moderate; ragweed is moderate; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains low, ragweed remains moderate, mugwort no longer expected.
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) | Low | 17/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 2/100 |
| Ragweed (Ambrosia) | Moderate | 42/100 |
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) | Low | 1/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 26/100 |
Local Environmental Conditions
Prescott Mill — Here, close enough to matter, at 0m, a waterway supports hazel and willow along its bank, both strongly allergenic wind-pollinated species. Located barely 19 meters away, this area has parkland with regularly mown grass and planted trees, both sources of grass and ragweed pollen. Year-to-year swings in rainfall and wind can shift this picture somewhat either way.
The bank's hazel and willow kick off the pollen season ahead of the rest, hitting its peak before most trees have even budded, around late winter into March. Through late spring, grass pollen climbs steadily toward its June peak, followed by ragweed's own peak stretch from mid-August into October. Local weather swings can shift these windows slightly, but the overall order tends to hold.
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Pollen forecast neighborhoods 3 neighborhoods
Frequently Asked Questions About Pollen in Illinois
Is pollen high in Boulder Hill right now?
On 20 September 2026, overall pollen levels in Boulder Hill are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Boulder Hill tomorrow?
On 21 September 2026, pollen conditions in Boulder Hill will be different from today, with grass at low levels, ambrosia at moderate levels
Is pollen expected to decrease in Boulder Hill 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 Boulder Hill?
On 20 September 2026, Ambrosia is the dominant pollen source in Boulder Hill. grass and artemisia are also present but at lower levels.
When is pollen season in Boulder Hill?
How often is the Boulder Hill pollen forecast updated?
The Boulder Hill pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Boulder Hill 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 Boulder Hill 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 Boulder Hill, 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. |
Get More in the Airmine Pollen app
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).
