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Rankings · Health
Fine particulate matter.
Average daily PM2.5 in micrograms per cubic metre — the fine particles from vehicle exhaust, industry and wildfire smoke that penetrate deepest into the lungs. The EPA annual standard is 9. Western counties can read high in wildfire years.
Hawaii has the lowest published air quality in this comparison, at 3.8 µg. The next states shown are Wyoming (5.1 µg) and New Hampshire (5.2 µg).
The table orders 50 states by fine particulate matter. 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 PM2.5 in micrograms per cubic metre — the fine particles from vehicle exhaust, industry and wildfire smoke that penetrate deepest into the lungs. The EPA annual standard is 9. Western counties can read high in wildfire years.
Not ranked, because this measure is not published for them: Connecticut. Depends on an EPA air monitor being sited nearby; many rural counties have none.
These guides combine this measure with other clearly named inputs; they are not overall state verdicts.
Free to use. The chart names its source and links back, so it stays honest wherever it ends up.
<iframe src="https://movermath.com/embed/air-quality" width="100%" height="420" style="border:0" loading="lazy" title="Fine particulate matter by state"></iframe>Source: County Health Rankings / EPA. · How this is built