Worst air pollution Naperville, today and tomorrow
Today (9 August): Air quality in Naperville is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 31.7/100).
Tomorrow (10 August 2026): Air quality in Naperville is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 32.6/100). 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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Naperville's air quality benefits from the flat Illinois prairie providing generally good wind dispersal, with vehicle emissions from I-88 and I-355 the primary local sources in this affluent Chicago western suburb. The Fox River corridor provides limited natural ventilation, while the broader Chicago metropolitan regional ozone burden from prevailing southwesterly winds and the region's industrial and vehicle emissions represents the primary background air quality concern throughout the summer ozone season across this rapidly growing DuPage County city.
Today - 9 August | Pollution peaks at 10:00
AQI:
Fair
31.7/100
PM2.5 (fine particles):
Good
4.4/100
PM10 (coarse particles):
Good
1.6/100
NO2 (nitrogen dioxide):
Good
1.4/100
O3 (ozone):
Fair
31.7/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
4.2/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 12:00
AQI:
Fair
32.6/100
PM2.5 (fine particles):
Good
6.7/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
1.5/100
O3 (ozone):
Fair
32.6/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
5.2/100
Pollen forecast in Naperville
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Naperville
Frequently Asked Questions
Is air quality bad in Naperville right now?
On 9 August 2026, overall air quality in Naperville is fair. AQI is the main air quality indicator at 31.7/100. Pollution peaks around 10:00 AM (O3: 31.7/100).
Will air quality be worse tomorrow in Naperville?
On 10 August 2026, air quality conditions in Naperville will be similar to today, with AQI forecast at fair at 32.6/100. Pollution peaks around 12:00 PM (O3: 32.6/100).
When is air pollution at its worst in Naperville?
Naperville follows a fairly predictable seasonal air quality pattern — spring and autumn tend to bring the cleanest, most stable air, whereas 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 Naperville 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: 10 August 2026 at 02:34 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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