Worst air pollution Green Bay, today and tomorrow
Today (30 August): Air quality in Green Bay is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 18.1/100).
Tomorrow (31 August 2026): Air quality in Green Bay is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 23.7/100). 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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Green Bay's air quality reflects the Lake Michigan coastal position in northeastern Wisconsin, with the bay's consistent lake winds providing maritime ventilation and the paper and packaging manufacturing industry in the Fox River corridor contributing elevated PM2.5 and sulfur compounds. The flat Wisconsin lake plain generally allows reasonable dispersal on most days, while summer regional ozone from Great Lakes industrial sources and the paper industry's VOC emissions contribute to the primary warm-season air quality concern.
Today - 30 August | Pollution peaks at 09:00
AQI:
Good
18.1/100
PM2.5 (fine particles):
Good
5.0/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
12.1/100
O3 (ozone):
Good
18.1/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
2.6/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 11:00
AQI:
Fair
23.7/100
PM2.5 (fine particles):
Good
8.6/100
PM10 (coarse particles):
Good
3.4/100
NO2 (nitrogen dioxide):
Good
15.7/100
O3 (ozone):
Fair
23.7/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
3.7/100
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Frequently Asked Questions
Is air quality bad in Green Bay right now?
On 30 August 2026, overall air quality in Green Bay is good. AQI is the main air quality indicator at 18.1/100. Pollution peaks around 9:00 AM (O3: 18.1/100).
Will air quality be worse tomorrow in Green Bay?
On 31 August 2026, air quality conditions in Green Bay will be worse than today, with AQI forecast at fair at 23.7/100. Pollution peaks around 11:00 AM (O3: 23.7/100).
When is air pollution at its worst in Green Bay?
Green Bay's air quality follows a clear seasonal pattern. Typically, the cleanest stretches usually come in spring and fall, between the summer ozone season and the calmer winter pollution episodes, while hot, humid summer conditions drive ozone formation, especially during heat waves. Calm, cold winter spells can occasionally allow local pollution to build up before the next weather system clears it.
Are air quality levels in Green Bay 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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