Marathon pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Marathon is high; ragweed is high; grass and mugwort are low. Tomorrow (10 August 2026) levels are similar. Over the following five days grass and ragweed will increase; 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
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Marathon's Lake Superior shoreline setting features spruce, birch, and pine as the main tree pollen sources, with exposure varying between boreal forest and the built-up remote northern Ontario mining-town centre.
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):
Low
14/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
20/100
-
Ragweed (Ambrosia):
High
52/100
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):
Low
20/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
22/100
-
Ragweed (Ambrosia):
High
58/100
Air quality in Marathon
View air qualityFrequently Asked Questions
Is pollen high in Marathon right now?
On 9 August 2026, overall pollen levels in Marathon are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Marathon tomorrow?
On 10 August 2026, pollen conditions in Marathon will be similar to today, with ambrosia at high levels, artemisia at low levels, grass at low levels
Is pollen expected to decrease in Marathon this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while ambrosia and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Marathon?
On 9 August 2026, Ambrosia is the dominant pollen source in Marathon. artemisia and grass are also present but at lower levels. cypress are not currently active.
When is pollen season in Marathon?
How often is the Marathon pollen forecast updated?
The Marathon pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Marathon 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 Marathon 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 Marathon, 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.
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 Marathon.
Get the full experience in the Airmine app.
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.