Worst air pollution Joliet, today and tomorrow
Today (9 August): Air quality in Joliet 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 Joliet 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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Joliet's air quality reflects its position at the Will County industrial gateway to the Chicago metropolitan area, with vehicle emissions from I-55 and I-80 and the surrounding intermodal freight terminals and industrial corridor generating elevated diesel PM2.5 from one of the US Midwest's busiest freight junctions. The Des Plaines River valley provides limited ventilation, while the flat Illinois prairie allows reasonable dispersal on most days and the greater Chicago regional ozone and PM2.5 burden from the southwest is the primary background concern.
Today - 9 August | Pollution peaks at 10:00
AQI:
Fair
31.7/100
PM2.5 (fine particles):
Good
4.8/100
PM10 (coarse particles):
Good
1.7/100
NO2 (nitrogen dioxide):
Good
4.4/100
O3 (ozone):
Fair
31.7/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
4.5/100
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
7.2/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Good
4.7/100
O3 (ozone):
Fair
32.6/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
5.6/100
Pollen forecast in Joliet
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Joliet
Frequently Asked Questions
Is air quality bad in Joliet right now?
On 9 August 2026, overall air quality in Joliet 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 Joliet?
On 10 August 2026, air quality conditions in Joliet 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 Joliet?
Air quality in Joliet shifts across the year. Typically, between summer ozone and occasional winter inversions, spring and fall are the year's cleanest stretch, 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 Joliet 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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