Worst air pollution Joliet, today and tomorrow
Today (16 July): 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 11:00 AM (O3: 36.7/100).
Tomorrow (17 July 2026): Air quality in Joliet is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 37.6/100). 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 - 16 July | Pollution peaks at 11:00
AQI:
Fair
36.7/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
10.9/100
NO2 (nitrogen dioxide):
Good
10.2/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.5/100
PM1 (ultrafine particles):
Good
7.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
37.6/100
PM2.5 (fine particles):
Good
6.9/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
12.9/100
O3 (ozone):
Fair
37.6/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
5.7/100
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 16 July 2026, overall air quality in Joliet is fair. AQI is the main air quality indicator at 36.7/100. Pollution peaks around 11:00 AM (O3: 36.7/100).
Will air quality be worse tomorrow in Joliet?
On 17 July 2026, air quality conditions in Joliet will be similar to today, with AQI forecast at fair at 37.6/100. Pollution peaks around 12:00 PM (O3: 37.6/100).
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.
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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