Worst air pollution Cheyenne, today and tomorrow
Today (16 July): 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 10:00 AM (O3: 36.5/100).
Tomorrow (17 July 2026): Air quality in Cheyenne is fair. AQI improves to medium; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 9:00 PM (NO2: 40.1/100). 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 - 16 July | Pollution peaks at 10:00
AQI:
Fair
36.5/100
PM2.5 (fine particles):
Good
16.7/100
PM10 (coarse particles):
Good
17.3/100
NO2 (nitrogen dioxide):
Fair
34.1/100
O3 (ozone):
Fair
36.5/100
SO2 (sulfur dioxide):
Good
3.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Good
10.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 21:00
AQI:
Medium
40.1/100
PM2.5 (fine particles):
Good
12.8/100
PM10 (coarse particles):
Good
6.1/100
NO2 (nitrogen dioxide):
Medium
40.1/100
O3 (ozone):
Fair
38.5/100
SO2 (sulfur dioxide):
Good
4.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
8.6/100
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 16 July 2026, overall air quality in Cheyenne is fair. AQI is the main air quality indicator at 36.5/100. Pollution peaks around 10:00 AM (O3: 36.5/100).
Will air quality be worse tomorrow in Cheyenne?
On 17 July 2026, air quality conditions in Cheyenne will be similar to today, with O3 forecast at fair at 38.5/100. Pollution peaks around 9:00 PM (NO2: 40.1/100).
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.
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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