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  3. Colorado

Colorado

United States

2026-09-21 03:00
AQI (US)
Good
Pollutants|Pollens
O3
μg/m³
87.2
PM2.5
μg/m³
3.7
PM10
μg/m³
15
NO2
μg/m³
9.8
CO
μg/m³
270.8
SO2
μg/m³
1.1
Weather
  • ℃
  • ℉
4℃
72%
1 kph
0 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (US)
  • Pollen
  • O3
  • PM2.5
  • PM10
  • NO2
  • CO
  • SO2
Places included
Adams County
AQI 38
Alamosa County
AQI 15
Arapahoe County
AQI 38
Archuleta County
AQI 34
Baca County
AQI 12
Bent County
AQI 15
Boulder County
AQI 44
Broomfield County
AQI 23
Chaffee County
AQI 12
Cheyenne County
AQI 6
Clear Creek County
AQI 43
Conejos County
AQI 15
Costilla County
AQI 10
Crowley County
AQI 11
Custer County
AQI 11
Delta County
AQI 24
Denver County
AQI 37
Dolores County
AQI 14
Douglas County
AQI 40
Eagle County
AQI 14
El Paso County
AQI 46
Elbert County
AQI 28
Fremont County
AQI 17
Garfield County
AQI 29
Gilpin County
AQI 45
Grand County
AQI 12
Gunnison County
AQI 30
Hinsdale County
AQI 18
Huerfano County
AQI 10
Jackson County
AQI 12
Jefferson County
AQI 45
La Plata County
AQI 40
Lake County
AQI 12
Larimer County
AQI 40
Las Animas County
AQI 16
Lincoln County
AQI 5
Logan County
AQI 8
Mesa County
AQI 40
Mineral County
AQI 12
Moffat County
AQI 14
Montezuma County
AQI 38
Montrose County
AQI 24
Morgan County
AQI 6
Otero County
AQI 24
Ouray County
AQI 37
Park County
AQI 12
Phillips County
AQI 9
Pitkin County
AQI 29
Prowers County
AQI 18
Pueblo County
AQI 39
Rio Blanco County
AQI 15
Rio Grande County
AQI 15
Routt County
AQI 29
Saguache County
AQI 13
San Juan County
AQI 37
San Miguel County
AQI 37
Sedgwick County
AQI 7
Summit County
AQI 13
Teller County
AQI 15
Washington County
AQI 6
Weld County
AQI 34
Yuma County
AQI 8
Data Sources
http://www.airnow.gov/

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