Worst Air Quality in Colorado

Top 100 cities ranked by worst air quality

Best Colorado Cities

Composite rankings combining multiple weighted metrics — 4 topics from climate and air quality data.

Best Climate Cities

Warm temperatures, plenty of sunshine and clean air.

Cleanest Air Cities

Lowest pollution levels for healthy outdoor living.

Sunniest Cities

Most days of sunshine per year, with warm and dry climate.

Most Urban Cities

Densely populated city centers with the largest urban footprints.

Population & Density

Largest Cities Smallest Cities Most Dense Least Dense

Economy

Highest Income Lowest Income Lowest Unemployment Highest Unemployment Lowest Poverty Highest Poverty Highest Wages Cheapest Cost of Living

Housing

Highest Home Value Most Affordable Highest Rent Lowest Rent Highest Homeownership Newest Housing Lowest Property Tax

Demographics & Education

Most Educated Best Schools Most Graduate Degrees Youngest Cities Oldest Cities Most Veterans

Health & Safety

Safest Cities Highest Crime Healthiest Cities Lowest Smoking Best Doctor Access Best Dental Access

Climate & Air

Warmest Cities Coldest Cities Rainiest Cities Driest Cities Sunniest Cities Snowiest Cities Cleanest Air Worst Air Quality

Quality of Life

Shortest Commute Most Work From Home

Civic & Politics

Most Republican Most Democratic Most Disasters

Geography & Infrastructure

Highest Elevation Best Broadband Most EV Stations Most Libraries Most Restaurants

All Countries · United States · Colorado

Worst Air Quality — Colorado

1 Denver AQI 55

2 Boulder AQI 49

3 Gunnison AQI 47

4 Pueblo AQI 44

5 Colorado Springs AQI 41

6 Aurora AQI 41

7 Fort Collins AQI 41

8 Lakewood AQI 41

9 Thornton AQI 41

10 Arvada AQI 41

11 Westminster AQI 41

12 Greeley AQI 41

13 Centennial AQI 41

14 Highlands Ranch AQI 41

15 Longmont AQI 41

16 Loveland AQI 41

17 Castle Rock AQI 41

18 Broomfield AQI 41

19 Grand Junction AQI 41

20 Commerce City AQI 41

21 Parker AQI 41

22 Littleton AQI 41

23 Brighton AQI 41

24 Security-Widefield AQI 41

25 Northglenn AQI 41

26 Windsor AQI 41

27 Pueblo West AQI 41

28 Dakota Ridge AQI 41

29 Englewood AQI 41

30 Ken Caryl AQI 41

31 Wheat Ridge AQI 41

32 Erie AQI 41

33 Lafayette AQI 41

34 Fountain AQI 41

35 Columbine AQI 41

36 Evans AQI 41

37 Four Square Mile AQI 41

38 Louisville AQI 41

39 Montrose AQI 41

40 Golden AQI 41

41 Clifton AQI 41

42 Sherrelwood AQI 41

43 Durango AQI 41

44 Cimarron Hills AQI 41

45 Fort Carson AQI 41

46 Johnstown AQI 41

47 Firestone AQI 41

48 Cañon City AQI 41

49 Welby AQI 41

50 Frederick AQI 41

51 Greenwood Village AQI 41

52 Black Forest AQI 41

53 Federal Heights AQI 41

54 Lone Tree AQI 41

55 Fruita AQI 41

56 Steamboat Springs AQI 41

57 Sterling AQI 41

58 Superior AQI 41

59 Castle Pines AQI 41

60 The Pinery AQI 41

61 Berthoud AQI 41

62 Wellington AQI 41

63 Fort Morgan AQI 41

64 Monument AQI 41

65 Cherry Creek AQI 41

66 Berkley AQI 41

67 Fairmount AQI 41

68 Rifle AQI 41

69 Gunbarrel AQI 41

70 Edwards AQI 41

71 Glenwood Springs AQI 41

72 Roxborough Park AQI 41

73 Severance AQI 41

74 Delta AQI 41

75 Stonegate AQI 41

76 Craig AQI 41

77 Cortez AQI 41

78 Woodmoor AQI 41

79 Redlands AQI 41

80 Milliken AQI 41

81 Derby AQI 41

82 Evergreen AQI 41

83 Fort Lupton AQI 41

84 Gypsum AQI 41

85 Trinidad AQI 41

86 Twin Lakes CDP (Adams County) AQI 41

87 Lochbuie AQI 41

88 Applewood AQI 41

89 Timnath AQI 41

90 Fruitvale AQI 41

91 Woodland Park AQI 41

92 Lamar AQI 41

93 Eagle AQI 41

94 La Junta AQI 41

95 Aspen AQI 41

96 Air Force Academy AQI 41

97 Orchard Mesa AQI 41

98 Carbondale AQI 41

99 Dacono AQI 41

100 Stratmoor AQI 41

Explore the top 100 cities ranked by worst air quality in Colorado.

City rankings help residents, researchers, and policymakers understand how communities compare across important quality-of-life measures.

Data is sourced from the U.S. Census Bureau, FBI Crime Statistics, and NOAA climate records.

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