Marshalltown pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Marshalltown is high; grass and ragweed are high; mugwort is medium. Tomorrow (10 August 2026) levels are similar - grass declining, mugwort declining, ragweed declining. Over the following five days grass, mugwort, and ragweed will increase. 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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Marshalltown sits on flat prairie farmland in central Iowa, where the dominant vegetation is a mix of corn and soybean fields, prairie grasses, and riverside willow, shaping the local pollen profile across the seasons. None of this is unusual for a town with Marshalltown's particular mix of terrain and plant life. Nearby towns with similar terrain tend to see a broadly similar pattern.
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):
High
51/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
28/100
-
Ragweed (Ambrosia):
High
53/100
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
30/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
6/100
-
Ragweed (Ambrosia):
Medium
32/100
Air quality in Marshalltown
View air qualityPollen forecast for neighborhoods and landmarks in Marshalltown
Frequently Asked Questions
Is pollen high in Marshalltown right now?
On 9 August 2026, overall pollen levels in Marshalltown are high. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Marshalltown tomorrow?
On 10 August 2026, pollen conditions in Marshalltown will be different from today, with artemisia, grass, ambrosia continuing to decline
Is pollen expected to decrease in Marshalltown this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in Marshalltown?
On 9 August 2026, Grass is the dominant pollen source in Marshalltown. ambrosia and artemisia are also present but at lower levels. cypress are not currently active.
When is pollen season in Marshalltown?
How often is the Marshalltown pollen forecast updated?
The Marshalltown pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Marshalltown 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 Marshalltown 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 Marshalltown, 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 Marshalltown.
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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.