What does this summer aqi ranking show?

It orders states by Summer air quality index. It is a comparison of this one published measure, not an overall ranking of where to live.

Where do these figures come from?

EPA AirData (2025) supplies this measure. States without a comparable published value are shown as not ranked rather than estimated.

How should I use this ranking?

Use it to narrow a search, then open a state or county profile for the underlying figures, source dates and caveats. A statewide number may not describe every neighbourhood.

Lowest summer aqi by state

Summer air quality index.

Average daily EPA Air Quality Index for June through August. Lower is cleaner; summer ozone and wildfire smoke can make this differ sharply from the annual average.

How to read this ranking

Alaska has the lowest published summer aqi in this comparison, at 22.7. The next states shown are Hawaii (23.6) and Montana (35.6).

The table orders 50 states by summer air quality index. It describes one published measure, not an overall judgment about where to live.

Use the result as a starting point, then compare the underlying source, dates, and local county figures before making a decision. Average daily EPA Air Quality Index for June through August. Lower is cleaner; summer ozone and wildfire smoke can make this differ sharply from the annual average.

1Alaska22.7
2Hawaii23.6
3Montana35.6
4Oregon36.9
5Washington37.6
6Idaho40.1
7Florida41.6
8Nebraska42.5
9Alabama42.7
10South Carolina42.9
11Georgia43.5
12Wyoming43.8
13Virginia44.0
14Maine44.4
15South Dakota44.4
16Louisiana44.5
17North Carolina44.5
18Mississippi44.8
19West Virginia44.9
20Tennessee46.1
21New Hampshire46.6
22Kansas47.2
23Vermont47.2
24Maryland47.3
25Missouri47.5
26Kentucky48.1
27Rhode Island48.1
28Arkansas49.0
29Massachusetts49.2
30Oklahoma50.5
31Iowa51.9
32Delaware52.1
33New Jersey52.4
34New York53.3
35Pennsylvania53.5
36Indiana54.5
37Wisconsin56.9
38Ohio57.0
39District of Columbia57.9
40Texas57.9
41New Mexico58.0
42Minnesota58.9
43Michigan59.5
44Colorado60.4
45North Dakota60.6
46Illinois65.7
47Utah66.0
48Arizona72.5
49Nevada75.2
50California87.2

Not ranked, because this measure is not published for them: Connecticut. EPA publishes this only for counties with nearby reporting monitors. A blank is no sufficiently complete monitoring record, not clean air.

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Frequently asked questions

What does this ranking show?: It orders states by Summer air quality index. It is one measure, not an overall verdict on where to live.
Where do the figures come from?: EPA AirData (2025). States without a comparable published figure are listed as not ranked rather than estimated.
How should I use it?: Use it to narrow your search, then open a state or county profile for the source date, caveats and local context.

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<iframe src="https://movermath.com/embed/summer-aqi" width="100%" height="420" style="border:0" loading="lazy" title="Summer air quality index by state"></iframe>

Source: EPA AirData (2025). · How this is built

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