Air Quality by State

Pollution, when harmful substances are introduced into the environment, can cause serious issues, as it is harmful to both the planet and people. In people, air pollution can cause serious complications to the lungs and other parts of the respiratory (as well as the cardiovascular) system, including developing asthma, bronchitis, and even cancer. 

In response to the growing problem of air pollution, the Clean Air Act (“CAA”) was enacted by Congress to enable the Environmental Protection Agency (“EPA”) to establish National Ambient Air Quality Standards and regulate hazardous air pollutants. The EPA’s Air Quality Index (AQI) is calculated from the four major air pollutants regulated by the CAA (ground-level ozone, particle pollution, carbon monoxide, and sulfur dioxide) and runs from zero to 500, with zero being clean air and 500 being the most hazardous. An AQI of less than 100 is considered satisfactory.

See for yourself how air quality compares by state by looking at the data in the charts.

Good Air Quality Days by State

Alabama - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

85.8%

#17 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#1 in the US

MODERATE AIR QUALITY DAYShelp

14%

#31 in the US

Alaska - Good Air Quality Days

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92.3%

#3 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.3%

#34 in the US

MODERATE AIR QUALITY DAYShelp

6.4%

#50 in the US

Arizona - Good Air Quality Days

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64.6%

#50 in the US

UNHEALTHY AIR QUALITY DAYShelp

6.5%

#51 in the US

MODERATE AIR QUALITY DAYShelp

28.9%

#2 in the US

Arkansas - Good Air Quality Days

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83%

#23 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#2 in the US

MODERATE AIR QUALITY DAYShelp

16.8%

#22 in the US

California - Good Air Quality Days

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60.6%

#51 in the US

UNHEALTHY AIR QUALITY DAYShelp

8.4%

#52 in the US

MODERATE AIR QUALITY DAYShelp

31.1%

#1 in the US

Colorado - Good Air Quality Days

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75.4%

#45 in the US

UNHEALTHY AIR QUALITY DAYShelp

3.7%

#46 in the US

MODERATE AIR QUALITY DAYShelp

20.9%

#9 in the US

Connecticut - Good Air Quality Days

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83.4%

#24 in the US

UNHEALTHY AIR QUALITY DAYShelp

2.3%

#42 in the US

MODERATE AIR QUALITY DAYShelp

14.3%

#32 in the US

Delaware - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

80.3%

#31 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.7%

#3 in the US

MODERATE AIR QUALITY DAYShelp

19%

#11 in the US

District of Columbia - Good Air Quality Days

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69%

#49 in the US

UNHEALTHY AIR QUALITY DAYShelp

2.2%

#43 in the US

MODERATE AIR QUALITY DAYShelp

28.8%

#3 in the US

Florida - Good Air Quality Days

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89.8%

#7 in the US

UNHEALTHY AIR QUALITY DAYShelp

0%

#4 in the US

MODERATE AIR QUALITY DAYShelp

10.2%

#44 in the US

Georgia - Good Air Quality Days

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82.1%

#27 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.4%

#5 in the US

MODERATE AIR QUALITY DAYShelp

17.5%

#21 in the US

Hawaii - Good Air Quality Days

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99.4%

#1 in the US

UNHEALTHY AIR QUALITY DAYShelp

0%

#6 in the US

MODERATE AIR QUALITY DAYShelp

0.6%

#52 in the US

Idaho - Good Air Quality Days

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79%

#37 in the US

UNHEALTHY AIR QUALITY DAYShelp

2.9%

#44 in the US

MODERATE AIR QUALITY DAYShelp

18.1%

#16 in the US

Illinois - Good Air Quality Days

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75%

#46 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.8%

#7 in the US

MODERATE AIR QUALITY DAYShelp

24.3%

#5 in the US

Indiana - Good Air Quality Days

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80.9%

#32 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.3%

#8 in the US

MODERATE AIR QUALITY DAYShelp

18.8%

#17 in the US

Iowa - Good Air Quality Days

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78.3%

#41 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.4%

#9 in the US

MODERATE AIR QUALITY DAYShelp

21.3%

#8 in the US

Kansas - Good Air Quality Days

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80.8%

#33 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.9%

#10 in the US

MODERATE AIR QUALITY DAYShelp

18.3%

#18 in the US

Kentucky - Good Air Quality Days

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85.2%

#18 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#11 in the US

MODERATE AIR QUALITY DAYShelp

14.6%

#33 in the US

Louisiana - Good Air Quality Days

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87.9%

#10 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#12 in the US

MODERATE AIR QUALITY DAYShelp

11.9%

#43 in the US

Maine - Good Air Quality Days

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93.2%

#2 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.5%

#13 in the US

MODERATE AIR QUALITY DAYShelp

6.3%

#51 in the US

Maryland - Good Air Quality Days

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84.2%

#20 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.7%

#14 in the US

MODERATE AIR QUALITY DAYShelp

15.1%

#25 in the US

Massachusetts - Good Air Quality Days

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87.1%

#11 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.5%

#15 in the US

MODERATE AIR QUALITY DAYShelp

12.5%

#39 in the US

Michigan - Good Air Quality Days

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79.9%

#38 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.7%

#16 in the US

MODERATE AIR QUALITY DAYShelp

19.4%

#12 in the US

Minnesota - Good Air Quality Days

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83.4%

#25 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.2%

#35 in the US

MODERATE AIR QUALITY DAYShelp

15.4%

#26 in the US

Mississippi - Good Air Quality Days

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85.5%

#19 in the US

UNHEALTHY AIR QUALITY DAYShelp

0%

#17 in the US

MODERATE AIR QUALITY DAYShelp

14.5%

#34 in the US

Missouri - Good Air Quality Days

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86.1%

#12 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.4%

#18 in the US

MODERATE AIR QUALITY DAYShelp

13.4%

#36 in the US

Montana - Good Air Quality Days

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80.8%

#34 in the US

UNHEALTHY AIR QUALITY DAYShelp

3.3%

#47 in the US

MODERATE AIR QUALITY DAYShelp

15.9%

#27 in the US

Nebraska - Good Air Quality Days

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86.8%

#13 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.5%

#19 in the US

MODERATE AIR QUALITY DAYShelp

12.6%

#40 in the US

Nevada - Good Air Quality Days

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72.5%

#47 in the US

UNHEALTHY AIR QUALITY DAYShelp

4.7%

#50 in the US

MODERATE AIR QUALITY DAYShelp

22.8%

#6 in the US

New Hampshire - Good Air Quality Days

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91%

#4 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.5%

#20 in the US

MODERATE AIR QUALITY DAYShelp

8.5%

#47 in the US

New Jersey - Good Air Quality Days

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82.3%

#28 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.8%

#21 in the US

MODERATE AIR QUALITY DAYShelp

16.9%

#23 in the US

New Mexico - Good Air Quality Days

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78.9%

#42 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.7%

#36 in the US

MODERATE AIR QUALITY DAYShelp

19.3%

#13 in the US

New York - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

88.7%

#8 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.6%

#22 in the US

MODERATE AIR QUALITY DAYShelp

10.6%

#45 in the US

North Carolina - Good Air Quality Days

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86.3%

#14 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.1%

#23 in the US

MODERATE AIR QUALITY DAYShelp

13.7%

#37 in the US

North Dakota - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

81.1%

#30 in the US

UNHEALTHY AIR QUALITY DAYShelp

3.2%

#48 in the US

MODERATE AIR QUALITY DAYShelp

15.8%

#28 in the US

Ohio - Good Air Quality Days

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80.9%

#35 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.3%

#24 in the US

MODERATE AIR QUALITY DAYShelp

18.8%

#19 in the US

Oklahoma - Good Air Quality Days

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76.7%

#44 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.1%

#37 in the US

MODERATE AIR QUALITY DAYShelp

22.2%

#7 in the US

Oregon - Good Air Quality Days

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83%

#26 in the US

UNHEALTHY AIR QUALITY DAYShelp

2.9%

#45 in the US

MODERATE AIR QUALITY DAYShelp

14.1%

#35 in the US

Pennsylvania - Good Air Quality Days

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79.2%

#39 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.6%

#25 in the US

MODERATE AIR QUALITY DAYShelp

20.2%

#10 in the US

Rhode Island - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

86.7%

#15 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.8%

#27 in the US

MODERATE AIR QUALITY DAYShelp

12.4%

#42 in the US

South Carolina - Good Air Quality Days

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84.9%

#21 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.1%

#28 in the US

MODERATE AIR QUALITY DAYShelp

15.1%

#29 in the US

South Dakota - Good Air Quality Days

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82.1%

#29 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.3%

#38 in the US

MODERATE AIR QUALITY DAYShelp

16.6%

#24 in the US

Tennessee - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

84.5%

#22 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.3%

#29 in the US

MODERATE AIR QUALITY DAYShelp

15.2%

#30 in the US

Texas - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

80.5%

#36 in the US

UNHEALTHY AIR QUALITY DAYShelp

1%

#39 in the US

MODERATE AIR QUALITY DAYShelp

18.5%

#20 in the US

Utah - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

70.2%

#48 in the US

UNHEALTHY AIR QUALITY DAYShelp

3.2%

#49 in the US

MODERATE AIR QUALITY DAYShelp

26.6%

#4 in the US

Vermont - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

91.3%

#5 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#30 in the US

MODERATE AIR QUALITY DAYShelp

8.5%

#48 in the US

Virginia - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

91.5%

#6 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.2%

#31 in the US

MODERATE AIR QUALITY DAYShelp

8.4%

#49 in the US

Washington - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

88.7%

#9 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.6%

#40 in the US

MODERATE AIR QUALITY DAYShelp

9.7%

#46 in the US

West Virginia - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

86.7%

#16 in the US

UNHEALTHY AIR QUALITY DAYShelp

0%

#32 in the US

MODERATE AIR QUALITY DAYShelp

13.2%

#38 in the US

Wisconsin - Good Air Quality Days

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GOOD AIR QUALITY DAYShelp

79.8%

#40 in the US

UNHEALTHY AIR QUALITY DAYShelp

0.9%

#33 in the US

MODERATE AIR QUALITY DAYShelp

19.3%

#14 in the US

Wyoming - Good Air Quality Days

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78.9%

#43 in the US

UNHEALTHY AIR QUALITY DAYShelp

1.8%

#41 in the US

MODERATE AIR QUALITY DAYShelp

19.3%

#15 in the US

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0%

#52 in the US