Worst air pollution Eau Claire, today and tomorrow
Today (30 August): Air quality in Eau Claire is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 18.3/100).
Tomorrow (31 August 2026): Air quality in Eau Claire is fair. AQI worsens to fair; NO2 increases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 22.5/100). Airmine updates local air quality forecasts four times daily.
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Eau Claire's air quality benefits from the flat western Wisconsin terrain providing generally good wind dispersal, with vehicle emissions from I-94 and the Chippewa River valley contributing local sources in this mid-sized university city. Regional ozone from agricultural and industrial sources across the Upper Midwest airshed can elevate summer readings, while the surrounding Wisconsin forest provides a clean-air backdrop on most days.
Today - 30 August | Pollution peaks at 11:00
AQI:
Good
18.3/100
PM2.5 (fine particles):
Good
5.1/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
12.5/100
O3 (ozone):
Good
18.3/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
3.5/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 10:00
AQI:
Fair
22.5/100
PM2.5 (fine particles):
Good
8.3/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Fair
20.5/100
O3 (ozone):
Fair
22.5/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
3.7/100
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Frequently Asked Questions
Is air quality bad in Eau Claire right now?
On 30 August 2026, overall air quality in Eau Claire is good. AQI is the main air quality indicator at 18.3/100. Pollution peaks around 11:00 AM (O3: 18.3/100).
Will air quality be worse tomorrow in Eau Claire?
On 31 August 2026, air quality conditions in Eau Claire will be worse than today, with AQI forecast at fair at 22.5/100. Pollution peaks around 10:00 AM (O3: 22.5/100).
When is air pollution at its worst in Eau Claire?
Conditions in Eau Claire vary noticeably across the seasons. Typically, spring and autumn tend to bring the cleanest, most stable air, while summer heat waves are the main driver of poor air quality, as ozone builds under stagnant, humid conditions. Lake-effect winds can help clear the air on many days near the Great Lakes shoreline.
Are air quality levels in Eau Claire 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: 30 August 2026 at 14:32 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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