Worst air pollution Cheyenne, today and tomorrow
Today (9 August): Air quality in Cheyenne is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 35.1/100).
Tomorrow (10 August 2026): Air quality in Cheyenne is fair. All pollutants stay as today. Pollution peaks around 10:00 AM (O3: 32.4/100). 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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Cheyenne's air quality benefits from the flat Wyoming high plains position at 1,848 metres, with consistent westerly winds from the Rocky Mountains providing generally good background ventilation. Vehicle emissions from I-25 and I-80 and the Francis E. Warren Air Force Base military operations are the primary local sources, while occasional winter inversions along the Wyoming Front Range corridor and summer ozone from regional vehicle traffic are the primary seasonal concerns.
Today - 9 August | Pollution peaks at 09:00
AQI:
Fair
35.1/100
PM2.5 (fine particles):
Good
13.4/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Fair
30.3/100
O3 (ozone):
Fair
35.1/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Good
15.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Fair
32.4/100
PM2.5 (fine particles):
Good
14.1/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Fair
29.3/100
O3 (ozone):
Fair
32.4/100
SO2 (sulfur dioxide):
Good
3.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
15.7/100
Pollen forecast in Cheyenne
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Cheyenne
Frequently Asked Questions
Is air quality bad in Cheyenne right now?
On 9 August 2026, overall air quality in Cheyenne is fair. AQI is the main air quality indicator at 35.1/100. Pollution peaks around 9:00 AM (O3: 35.1/100).
Will air quality be worse tomorrow in Cheyenne?
On 10 August 2026, air quality conditions in Cheyenne will be similar to today, with AQI forecast at fair at 32.4/100. Pollution peaks around 10:00 AM (O3: 32.4/100).
When is air pollution at its worst in Cheyenne?
Air quality across Cheyenne rises and falls with the seasons — spring and autumn generally bring the cleanest, most stable air, whereas valley and basin locations can see pollution trapped under cold air for days during winter inversions. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Cheyenne 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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