Worst air pollution Aspen, today and tomorrow
Today (16 July): Air quality in Aspen is very poor. AQI and NO2 are very poor; O3 is fair; PM2.5, PM10, SO2, and PM1 are medium; CO and HCHO are good. Pollution peaks around 12:00 AM (NO2: 100/100).
Tomorrow (17 July 2026): Air quality in Aspen is very poor. All pollutants stay as today. Pollution peaks around 12:00 AM (NO2: 100/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Aspen's air quality is shaped largely by high-altitude thin air and winter inversions; valley inversions can trap wood-smoke haze on calm winter nights. These factors combine to give Aspen a fairly typical seasonal air quality pattern for this part of the country. Visitors and residents alike tend to notice the clearest air outside the warmest summer weeks.
Today - 16 July | Pollution peaks at 00:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Medium
49.4/100
PM10 (coarse particles):
Medium
43.1/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Medium
44.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Medium
42.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Medium
53.7/100
PM10 (coarse particles):
Medium
46.4/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Fair
39.5/100
SO2 (sulfur dioxide):
Medium
43.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Medium
44.3/100
Pollen forecast in Aspen
View pollen forecastFrequently Asked Questions
Is air quality bad in Aspen right now?
On 16 July 2026, overall air quality in Aspen is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 12:00 AM (NO2: 100/100).
Will air quality be worse tomorrow in Aspen?
On 17 July 2026, air quality conditions in Aspen will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 12:00 AM (NO2: 100/100).
When is air pollution at its worst in Aspen?
Aspen follows a fairly predictable seasonal air quality pattern, as autumn is often the cleanest stretch, between wildfire season and the onset of winter inversions; by contrast, summer brings regional wildfire smoke, while winter brings its own inversion-driven pollution episodes. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Aspen 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.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
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