Worst air pollution Green Bay, today and tomorrow
Today (9 August): Air quality in Green Bay is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 40.9/100).
Tomorrow (10 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 10:00 AM (O3: 34.0/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
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.
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 - 9 August | Pollution peaks at 08:00
AQI:
Medium
40.9/100
PM2.5 (fine particles):
Good
13.1/100
PM10 (coarse particles):
Good
9.1/100
NO2 (nitrogen dioxide):
Fair
23.0/100
O3 (ozone):
Medium
40.9/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.2/100
PM1 (ultrafine particles):
Good
9.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
9.4/100
PM10 (coarse particles):
Good
6.3/100
NO2 (nitrogen dioxide):
Fair
20.6/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.3/100
PM1 (ultrafine particles):
Good
6.6/100
Pollen forecast in Green Bay
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Green Bay
Frequently Asked Questions
Is air quality bad in Green Bay right now?
On 9 August 2026, overall air quality in Green Bay is fair. NO2 is the main pollutant at 23.0/100. Pollution peaks around 8:00 AM (O3: 40.9/100).
Will air quality be worse tomorrow in Green Bay?
On 10 August 2026, air quality conditions in Green Bay will be similar to today, with AQI forecast at fair at 34.0/100. Pollution peaks around 10:00 AM (O3: 34.0/100).
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.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
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.
Get the full experience in the Airmine app.