Mason City pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Mason City is high; grass is high; mugwort and ragweed are medium. Tomorrow (10 August 2026) levels are similar - mugwort remains medium, ragweed remains medium, grass declining. Over the following five days ragweed will increase; grass and mugwort 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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Set on flat prairie farmland in north-central Iowa, Mason City's landscape is defined by corn and soybean fields alongside prairie grasses and riverside cottonwood, the main contributors to seasonal pollen exposure. None of this is unusual for a town with Mason City's particular mix of terrain and plant life. Allergy sufferers in Mason City generally plan around this same recurring seasonal rhythm.
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
55/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
46/100
-
Ragweed (Ambrosia):
Medium
49/100
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
44/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
34/100
-
Ragweed (Ambrosia):
Medium
39/100
Air quality in Mason City
View air qualityFrequently Asked Questions
Is pollen high in Mason City right now?
On 9 August 2026, overall pollen levels in Mason City are high. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Mason City tomorrow?
On 10 August 2026, pollen conditions in Mason City will be different from today, with ambrosia at medium levels, artemisia at medium levels and grass continuing to decline
Is pollen expected to decrease in Mason City this week?
According to the five-day outlook, artemisia and grass pollen levels are expected to gradually decrease, while ambrosia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Mason City?
On 9 August 2026, Grass is the dominant pollen source in Mason City. ambrosia and artemisia are also present but at lower levels. cypress are not currently active.
When is pollen season in Mason City?
How often is the Mason City pollen forecast updated?
The Mason City pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Mason City 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 Mason City 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 Mason City, 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 Mason City.
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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.