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Colorado

United States

2026-09-21 22:00
AQI (China)
Excellent
Pollutants|Pollens
O3
μg/m³
118.3
PM10
μg/m³
11.8
PM2.5
μg/m³
3.1
NO2
μg/m³
5.1
CO
μg/m³
187.5
SO2
μg/m³
1.3
Weather
  • ℃
  • ℉
13℃
42%
14 kph
0 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (China)
  • Pollen
  • O3
  • PM10
  • PM2.5
  • NO2
  • CO
  • SO2
Places included
Adams County
AQI 40
Alamosa County
AQI 11
Arapahoe County
AQI 36
Archuleta County
AQI 37
Baca County
AQI 3
Bent County
AQI 2
Boulder County
AQI 42
Broomfield County
AQI 11
Chaffee County
AQI 3
Cheyenne County
AQI 3
Clear Creek County
AQI 37
Conejos County
AQI 11
Costilla County
AQI 3
Crowley County
AQI 3
Custer County
AQI 5
Delta County
AQI 10
Denver County
AQI 37
Dolores County
AQI 2
Douglas County
AQI 36
Eagle County
AQI 4
El Paso County
AQI 37
Elbert County
AQI 23
Fremont County
AQI 16
Garfield County
AQI 35
Gilpin County
AQI 39
Grand County
AQI 4
Gunnison County
AQI 37
Hinsdale County
AQI 8
Huerfano County
AQI 2
Jackson County
AQI 4
Jefferson County
AQI 43
La Plata County
AQI 35
Lake County
AQI 3
Larimer County
AQI 41
Las Animas County
AQI 2
Lincoln County
AQI 2
Logan County
AQI 2
Mesa County
AQI 35
Mineral County
AQI 3
Moffat County
AQI 5
Montezuma County
AQI 33
Montrose County
AQI 10
Morgan County
AQI 3
Otero County
AQI 2
Ouray County
AQI 13
Park County
AQI 3
Phillips County
AQI 2
Pitkin County
AQI 33
Prowers County
AQI 4
Pueblo County
AQI 36
Rio Blanco County
AQI 5
Rio Grande County
AQI 11
Routt County
AQI 11
Saguache County
AQI 4
San Juan County
AQI 13
San Miguel County
AQI 13
Sedgwick County
AQI 1
Summit County
AQI 4
Teller County
AQI 4
Washington County
AQI 2
Weld County
AQI 41
Yuma County
AQI 2
Data Sources
http://www.airnow.gov/

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AQI 23
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AQI 37
Breckenridge
AQI 4
Silverthorne
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Frisco
AQI 3
Wildernest
AQI 3
Bailey
AQI 36
Idaho Springs
AQI 38
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Winter Park
AQI 22