Le Roy Township pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Le Roy Township is high; ragweed is high; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed declining, 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 12/100 |
| Ragweed (Ambrosia) | High | 51/100 |
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 | 25/100 |
Local Environmental Conditions
For Le Roy Township, here, in the surrounding area, hazel and willow grow along the bank, contributing some of the season's earliest allergenic pollen. This area, in the vicinity, has this park's mix of turf and landscaped trees contributes a modest grass and ragweed pollen load. As with most local readings, actual levels can vary somewhat with short-term weather swings.
For Le Roy Township, the waterside hazel and willow are consistently first to release pollen each year, leading off the pollen calendar, with a peak generally falling in late winter. Late spring sees grass pollen build steadily toward a peak in June, followed by ragweed's own peak stretch from mid-August into October.
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Frequently Asked Questions About Pollen in Minnesota
Is pollen high in Le Roy Township right now?
On 20 September 2026, overall pollen levels in Le Roy Township are high. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels
Will pollen levels change in Le Roy Township tomorrow?
On 21 September 2026, pollen conditions in Le Roy Township will be different from today, with ambrosia continuing to decline
Is pollen expected to decrease in Le Roy Township 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 Le Roy Township?
On 20 September 2026, Ambrosia is the dominant pollen source in Le Roy Township. artemisia are also present but at lower levels. grass are not currently active.
When is pollen season in Le Roy Township?
How often is the Le Roy Township pollen forecast updated?
The Le Roy Township pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Le Roy Township 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 Le Roy Township 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 Le Roy Township, 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).
