Worst air pollution Marathon, today and tomorrow
Today (9 August): Air quality in Marathon is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (NO2: 42.9/100).
Tomorrow (10 August 2026): Air quality in Marathon is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 9:00 PM (NO2: 35.7/100). Airmine updates local air quality forecasts four times daily.
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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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Marathon's air quality benefits from its remote Lake Superior shoreline position, with lake breezes providing reliable ventilation amid otherwise clean, sparsely populated boreal surroundings and legacy mining activity.
Today - 9 August | Pollution peaks at 00:00
AQI:
Medium
42.9/100
PM2.5 (fine particles):
Good
17.9/100
PM10 (coarse particles):
Good
15.0/100
NO2 (nitrogen dioxide):
Medium
42.9/100
O3 (ozone):
Fair
29.8/100
SO2 (sulfur dioxide):
Good
13.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.9/100
PM1 (ultrafine particles):
Good
18.3/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 21:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Fair
35.7/100
O3 (ozone):
Fair
28.8/100
SO2 (sulfur dioxide):
Good
10.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
8.7/100
Pollen forecast in Marathon
View pollen forecastFrequently Asked Questions
Is air quality bad in Marathon right now?
On 9 August 2026, overall air quality in Marathon is fair. O3 is the main pollutant at 29.8/100. Pollution peaks around 12:00 AM (NO2: 42.9/100).
Will air quality be worse tomorrow in Marathon?
On 10 August 2026, air quality conditions in Marathon will be similar to today, with AQI forecast at fair at 35.7/100. Pollution peaks around 9:00 PM (NO2: 35.7/100).
When is air pollution at its worst in Marathon?
The air over Marathon varies through the year, influenced by its pulp mill on the shore of Lake Superior. Air quality is generally very good outside of wildfire season, though hot, dry summers can bring smoky, hazy stretches when fires burn across the wider region. Because the population is small, local emissions rarely matter as much as what drifts in from distant fires.
Are air quality levels in Marathon based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
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.
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