Worst air pollution Greeley, today and tomorrow
Today (16 July): Air quality in Greeley is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 36.2/100).
Tomorrow (17 July 2026): Air quality in Greeley is fair. All pollutants stay as today. Pollution peaks around 7:00 AM (O3: 38.9/100). 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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Greeley's air quality reflects the Northern Colorado oil and gas extraction region's unique air quality challenge, with the Weld County DJ Basin's massive concentrated oil and gas well field generating elevated VOCs, methane, and benzene from thousands of surrounding wells that create some of the US's highest urban-proximate oil and gas extraction emission densities. The Front Range position provides mountain westerly ventilation, while the concentrated extraction operations make Greeley's air quality distinctly different from standard vehicle-dominated US urban profiles.
Today - 16 July | Pollution peaks at 07:00
AQI:
Fair
36.2/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
9.7/100
NO2 (nitrogen dioxide):
Good
11.9/100
O3 (ozone):
Fair
36.2/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Good
6.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 07:00
AQI:
Fair
38.9/100
PM2.5 (fine particles):
Good
10.3/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Good
13.0/100
O3 (ozone):
Fair
38.9/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Good
6.0/100
Pollen forecast in Greeley
View pollen forecastFrequently Asked Questions
Is air quality bad in Greeley right now?
On 16 July 2026, overall air quality in Greeley is fair. AQI is the main air quality indicator at 36.2/100. Pollution peaks around 7:00 AM (O3: 36.2/100).
Will air quality be worse tomorrow in Greeley?
On 17 July 2026, air quality conditions in Greeley will be similar to today, with AQI forecast at fair at 38.9/100. Pollution peaks around 7:00 AM (O3: 38.9/100).
When is air pollution at its worst in Greeley?
Greeley sees air quality change through the year. In short, autumn is often the cleanest stretch, between wildfire season and the onset of winter inversions, whereas winter temperature inversions can trap cold air and pollution in valleys and basins for days at a time. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Greeley 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