Worst air pollution Grand Junction, today and tomorrow
Today (16 July): Air quality in Grand Junction is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 35.2/100).
Tomorrow (17 July 2026): Air quality in Grand Junction is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 39.5/100). 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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Grand Junction's air quality reflects the Colorado River valley's partial topographic enclosure between the Book Cliffs to the north and the Uncompahgre Plateau to the south, with vehicle emissions from I-70 and the surrounding Piceance Basin oil and gas extraction operations generating elevated VOCs and NOₓ. Winter temperature inversions in the valley can trap emissions for extended periods, while summer ozone from the concentrated oil and gas extraction in the surrounding Grand Valley adds the primary warm-season air quality concern.
Today - 16 July | Pollution peaks at 11:00
AQI:
Fair
35.2/100
PM2.5 (fine particles):
Good
19.7/100
PM10 (coarse particles):
Good
13.1/100
NO2 (nitrogen dioxide):
Fair
34.7/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
6.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
13.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 10:00
AQI:
Fair
39.5/100
PM2.5 (fine particles):
Fair
23.8/100
PM10 (coarse particles):
Good
15.9/100
NO2 (nitrogen dioxide):
Fair
33.6/100
O3 (ozone):
Fair
39.5/100
SO2 (sulfur dioxide):
Good
6.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
15.7/100
Pollen forecast in Grand Junction
View pollen forecastFrequently Asked Questions
Is air quality bad in Grand Junction right now?
On 16 July 2026, overall air quality in Grand Junction is fair. AQI is the main air quality indicator at 35.2/100. Pollution peaks around 11:00 AM (O3: 35.2/100).
Will air quality be worse tomorrow in Grand Junction?
On 17 July 2026, air quality conditions in Grand Junction will be similar to today, with AQI forecast at fair at 39.5/100. Pollution peaks around 10:00 AM (O3: 39.5/100).
When is air pollution at its worst in Grand Junction?
Like most US cities, Grand Junction sees air quality shift from season to season. Typically, spring and autumn generally bring the cleanest, most stable air, while wildfire smoke drifting in from across the region is the main summer concern, while winter inversions can trap pollution locally. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Grand Junction 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