# Counties in Tennessee by share of days with good air quality (US EPA AQI), 2003

All 30 values come from U.S. Environmental Protection Agency for 2003, so the places are comparable. 12 counties have no value for that period and are not ranked.

- Indicator id: `aqi_good_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/good-air-quality-days-share/tennessee-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Bradley County | 100 |
| 2 | DeKalb County | 83.4 |
| 3 | Claiborne County | 81.9 |
| 4 | McMinn County | 78.8 |
| 5 | Humphreys County | 78.2 |
| 6 | Union County | 76.1 |
| 7 | Anderson County | 72.2 |
| 8 | Obion County | 69.5 |
| 9 | Jefferson County | 69 |
| 10 | Meigs County | 68 |
| 11 | Haywood County | 66.4 |
| 12 | Wilson County | 63.8 |
| 13 | Madison County | 63 |
| 14 | Rutherford County | 61 |
| 15 | Sullivan County | 59.7 |
| 16 | Williamson County | 59.4 |
| 17 | Sevier County | 53.7 |
| 18 | Lawrence County | 53.6 |
| 19 | Blount County | 50 |
| 20 | Putnam County | 44.8 |
| 21 | Sumner County | 42.8 |
| 22 | Hamilton County | 41.6 |
| 23 | Montgomery County | 41 |
| 24 | Dyer County | 39 |
| 25 | Roane County | 33 |
| 26 | Maury County | 28.4 |
| 27 | Loudon County | 21.3 |
| 28 | Knox County | 18.1 |
| 29 | Davidson County | 13.2 |
| 30 | Shelby County | 12.1 |