Worst air pollution Janesville, today and tomorrow
Today (16 July): Air quality in Janesville is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 35.4/100).
Tomorrow (17 July 2026): Air quality in Janesville is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 33.6/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Janesville's air quality reflects the Rock River valley's flat Midwest Wisconsin terrain, with vehicle emissions from I-90 and the former GM Janesville Assembly Plant legacy — once the US's oldest automotive assembly plant — contributing local sources. The flat Wisconsin river plain provides generally good wind dispersal, while summer regional ozone from Great Lakes industrial sources is the primary warm-season concern and the Rock River valley provides limited additional ventilation throughout the year.
Today - 16 July | Pollution peaks at 11:00
AQI:
Fair
35.4/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
8.5/100
NO2 (nitrogen dioxide):
Good
8.4/100
O3 (ozone):
Fair
35.4/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.5/100
PM1 (ultrafine particles):
Good
4.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 09:00
AQI:
Fair
33.6/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
6.9/100
NO2 (nitrogen dioxide):
Good
7.2/100
O3 (ozone):
Fair
33.6/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
5.1/100
Pollen forecast in Janesville
View pollen forecastFrequently Asked Questions
Is air quality bad in Janesville right now?
On 16 July 2026, overall air quality in Janesville is fair. AQI is the main air quality indicator at 35.4/100. Pollution peaks around 11:00 AM (O3: 35.4/100).
Will air quality be worse tomorrow in Janesville?
On 17 July 2026, air quality conditions in Janesville will be similar to today, with AQI forecast at fair at 33.6/100. Pollution peaks around 9:00 AM (O3: 33.6/100).
When is air pollution at its worst in Janesville?
Janesville's air quality has a clear seasonal rhythm. In short, spring and autumn tend to bring the cleanest, most stable air, whereas prolonged summer heat waves are when air quality most often dips into unhealthy territory. Calm, cold winter spells can occasionally allow local pollution to build up before the next weather system clears it.
Are air quality levels in Janesville 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.
Want to see air quality forecasts for other cities in United States?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app