Decorah Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Decorah is moderate; mugwort, ragweed, and mold (cladosporium) are moderate; mold (alternaria) is low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (cladosporium) remains moderate, mugwort declining, ragweed declining, mold (alternaria) increasing.
7-Day Trend
Over the next week mugwort will increase; ragweed, mold (alternaria), and mold (cladosporium) will decrease; grass will remain stable.
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Pollen Risk
Today - 10 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 26/100 |
| Ragweed (Ambrosia) | Moderate | 40/100 |
| Mold (Alternaria) | Low | 24/100 |
| Mold (Cladosporium) | Moderate | 32/100 |
Tomorrow - 11 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) | Low | 3/100 | |
| Ragweed (Ambrosia) | Low | 17/100 | |
| Mold (Alternaria) | Moderate | 26/100 | |
| Mold (Cladosporium) | Moderate | 37/100 |
Local Environmental Conditions
Built-up land makes up around 38% of the area near the center of Decorah, with a good deal of woodland and some open grassland. With the Upper Iowa River nearby, riverside vegetation along its banks contributes to the local mix. Oak and pecan are among the allergenic trees nearby. Grass pollen adds noticeably to the overall load.
Oak and pecan lead the season in late spring, as temperatures climb to around 15°C, and tree pollen reaches its peak. Grasses take over in early summer, with temperatures around 20°C, and their pollen lingers into early fall. A smaller weed peak follows from early summer into early fall. Mold spores join in through summer, when damp, warm spells let them thrive. By late fall, pollen levels are low again.
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Frequently Asked Questions About Pollen in Iowa
Is pollen high in Decorah right now?
On 10 October 2026, overall pollen levels in Decorah are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels
Will pollen levels change in Decorah tomorrow?
On 11 October 2026, pollen conditions in Decorah will be different from today, with ambrosia, artemisia continuing to decline
Is pollen expected to decrease in Decorah this week?
According to the five-day outlook, ambrosia pollen levels are expected to gradually decrease, while artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Decorah?
On 10 October 2026, Ambrosia is the dominant pollen source in Decorah. artemisia are also present but at lower levels. grass are not currently active.
When is pollen season in Decorah?
How often is the Decorah pollen forecast updated?
The Decorah pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Decorah 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 Decorah 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 Decorah, 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. |
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).
