Decorah pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Decorah is medium; grass and ragweed are medium; mugwort is low. Tomorrow (10 August 2026) levels are similar - grass remains medium, mugwort increasing, ragweed increasing. Over the following five days grass, mugwort, and ragweed will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The vegetation around Decorah, on the driftless-area bluffs above the Upper Iowa River, is dominated by oak-hickory forest and bur oak savanna, with riverside cottonwood adding further seasonal pollen exposure. Wind patterns across the area help determine how far pollen travels from these source plants. Residents who spend time outdoors around Decorah typically notice the shift as each season turns over.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Medium
40/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
24/100
-
Ragweed (Ambrosia):
Medium
47/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Medium
46/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
31/100
-
Ragweed (Ambrosia):
High
54/100
Air quality in Decorah
View air qualityFrequently Asked Questions
Is pollen high in Decorah right now?
On 9 August 2026, overall pollen levels in Decorah are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Decorah tomorrow?
On 10 August 2026, pollen conditions in Decorah will be different from today, with grass at medium levels and ambrosia, artemisia increasing
Is pollen expected to decrease in Decorah this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Decorah?
On 9 August 2026, Grass is the dominant pollen source in Decorah. ambrosia and artemisia are also present but at lower levels. cypress 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.
Want to see pollen forecasts for other cities in United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Decorah.
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Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.