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Cities with cleanest air in United States

Hilo, United States has the lowest pm2.5 — annual mean of the 30 cities compared: 2.66 µg/m³ (U.S. EPA Air Quality System / AirData, 2024-12-31).

JSON Markdown

United States cities ranked by annual PM2.5 concentration, not by current readings.

Items compared
30
Countries represented
1
Last checked
2026-08-06

Source-backed answers

Compare each answer with its unit and checked date; the complete source ledger is below.

Showing all 30 rows

Original rankCity or placeSource and scope
1Hilo, United States2.66 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
2Kīhei, United States2.87 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
3City of Sammamish, United States2.87 µg/m³2026-08-06
Source Scope: nearest_station · Period: 2024-12-31
4Green Valley, United States2.96 µg/m³2026-08-06
Source Scope: nearest_station · Period: 2024-12-31
5Rock Springs, United States3.21 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
6East Providence, United States3.46 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
7Cheyenne, United States3.75 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
8Hurricane, United States3.85 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
9Hillsboro, United States3.85 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
10Mesquite, United States3.9 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
11Mesquite, United States3.9 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
12Aloha, United States3.9 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
13San Luis, United States3.9 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
14San Luis Obispo, United States3.9 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
15Casper, United States3.91 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
16Bremerton, United States3.93 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
17Concord, United States3.93 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
18Concord, United States3.93 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
19Concord, United States3.93 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
20Juneau and borough, United States3.93 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
21Gilroy, United States3.96 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
22Silverdale, United States3.96 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
23Enterprise, United States3.99 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
24Kahului, United States4.02 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31
25Bangor, United States4.04 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
26Ridgecrest, United States4.13 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
27Lewiston, United States4.14 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
28Lewiston, United States4.14 µg/m³2026-07-29
Source Scope: city · Period: 2024-12-31
29Urban Honolulu, United States4.14 µg/m³2026-08-06
Source Scope: nearest_station · Period: 2024-12-31
30East Honolulu, United States4.19 µg/m³2026-08-05
Source Scope: nearest_station · Period: 2024-12-31

What the numbers say

  • Hilo, United States leads at 2.66 µg/m³.
  • East Honolulu, United States sits at the other end with 4.19 µg/m³.
  • The middle of this ranking is 3.93 µg/m³, across 30 places that publish the metric.
  • The spread between first and last is 1.53 µg/m³.

Quick answer

What does Cities with cleanest air in United States show?

Hilo, United States has the lowest pm2.5 — annual mean of the 30 cities compared: 2.66 µg/m³ (U.S. EPA Air Quality System / AirData, 2024-12-31).

How this list is built

Every row is a published pm2.5 — annual mean observation measured in µg/m³, ranked lowest first. The values were observed in 2024. A place appears only when it publishes this exact metric, so an absent place means missing data rather than a low value. Only published cities with at least 20,000 residents and city-level observations qualify.

  • Compare the displayed value, unit, source date and geographic grain together.
  • A city label does not change a regional observation into a city measurement.
Rows
30 places
Geographic grain
2 grains: nearest_station, city
Observation period
2024-12-31
Last checked
2026-08-06
With an official source link
30 of 30

Cite this page

Open a format to select or copy this ImmigrationDB compilation citation. The native disclosure and text fallback work without JavaScript.

APA citation
ImmigrationDB. (2026, October 16). Cities with cleanest air in United States [ImmigrationDB compilation; version 3d520a8ef1eaeb1fc09458c08aab3c75]. ImmigrationDB. https://immigrationdb.com/reports/united-states-cities-with-cleanest-air/ Retrieved 2026-10-16. Compilation license: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/
BibTeX citation
@misc{immigrationdb_immigrationdb_cities-with-cleanest-air-in-united-states_232b78df67ff,
  author = {ImmigrationDB},
  title = {Cities with cleanest air in United States},
  publisher = {ImmigrationDB},
  year = {2026},
  date = {2026-10-16},
  version = {3d520a8ef1eaeb1fc09458c08aab3c75},
  url = {https://immigrationdb.com/reports/united-states-cities-with-cleanest-air/},
  note = {Retrieved 2026-10-16. ImmigrationDB compilation. Compilation license: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/},
}
Markdown citation
[Cities with cleanest air in United States](https://immigrationdb.com/reports/united-states-cities-with-cleanest-air/) — ImmigrationDB; ImmigrationDB; version 3d520a8ef1eaeb1fc09458c08aab3c75; retrieved 2026-10-16; built 2026-10-16.

This citation identifies the ImmigrationDB compilation/page. Underlying source publishers and datasets retain their own terms; inspect the Sources section and cite those records separately. View the underlying source records.

Sources

  1. U.S. EPA Air Quality System / AirDataU.S. EPA Air Quality System / AirData · Checked 2026-08-05