Worst air pollution Normal, today and tomorrow
Today (9 August): Air quality in Normal is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 34.2/100).
Tomorrow (10 August 2026): Air quality in Normal is fair. PM2.5 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 35.6/100). Airmine updates local air quality forecasts four times daily.
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Normal's air quality in Illinois benefits from the flat Heartland prairie providing excellent wind dispersal, with vehicle emissions from I-55 and the Illinois State University campus and surrounding automotive manufacturing — Normal hosting Rivian's EV assembly plant — contributing local sources. Agricultural ammonia from surrounding Corn Belt farming contributes secondary particulate formation, while summer ozone from Midwest agricultural and industrial sources is the primary warm-season concern throughout the year.
Today - 9 August | Pollution peaks at 08:00
AQI:
Fair
34.2/100
PM2.5 (fine particles):
Good
14.8/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
10.6/100
O3 (ozone):
Fair
34.2/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.7/100
PM1 (ultrafine particles):
Good
19.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 09:00
AQI:
Fair
35.6/100
PM2.5 (fine particles):
Fair
20.1/100
PM10 (coarse particles):
Good
5.9/100
NO2 (nitrogen dioxide):
Good
13.2/100
O3 (ozone):
Fair
35.6/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.0/100
PM1 (ultrafine particles):
Fair
24.9/100
Pollen forecast in Normal
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Normal
Frequently Asked Questions
Is air quality bad in Normal right now?
On 9 August 2026, overall air quality in Normal is fair. AQI is the main air quality indicator at 34.2/100. Pollution peaks around 8:00 AM (O3: 34.2/100).
Will air quality be worse tomorrow in Normal?
On 10 August 2026, air quality conditions in Normal will be similar to today, with AQI forecast at fair at 35.6/100. Pollution peaks around 9:00 AM (O3: 35.6/100).
When is air pollution at its worst in Normal?
Normal's air quality follows a clear seasonal pattern, as the mildest, cleanest weather usually falls in spring and autumn; by contrast, prolonged summer heat waves are when air quality most often dips into unhealthy territory. Lake-effect winds can help clear the air on many days near the Great Lakes shoreline.
Are air quality levels in Normal 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: 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.
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