# Counties in Texas by share of days with good air quality (US EPA AQI), 2025

All 45 values come from U.S. Environmental Protection Agency for 2025, so the places are comparable. 18 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/texas-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Karnes County | 100 |
| 1 | Wilson County | 100 |
| 3 | Rockwall County | 96.8 |
| 4 | Polk County | 94.8 |
| 5 | Potter County | 94.1 |
| 6 | Lubbock County | 92.9 |
| 7 | Hunt County | 91.7 |
| 8 | Smith County | 90.4 |
| 9 | Ellis County | 89.2 |
| 10 | Victoria County | 86.7 |
| 11 | Gregg County | 86.6 |
| 12 | Johnson County | 85.5 |
| 13 | Hood County | 83.4 |
| 14 | Randall County | 82.8 |
| 15 | Parker County | 81.8 |
| 16 | Brazoria County | 80.8 |
| 17 | Culberson County | 76.1 |
| 18 | Atascosa County | 76 |
| 19 | Collin County | 75.8 |
| 20 | Brewster County | 74.7 |
| 21 | Ector County | 72.3 |
| 22 | Brazos County | 68.5 |
| 23 | Bell County | 66 |
| 23 | Kaufman County | 66 |
| 25 | Harrison County | 64.4 |
| 26 | Maverick County | 63 |
| 27 | Orange County | 60.2 |
| 28 | Galveston County | 59.7 |
| 29 | Navarro County | 59.2 |
| 30 | Denton County | 57.8 |
| 31 | Bowie County | 55 |
| 32 | Kleberg County | 51.7 |
| 33 | Webb County | 49.9 |
| 34 | Jefferson County | 47.9 |
| 35 | McLennan County | 46.6 |
| 36 | Hidalgo County | 44.4 |
| 37 | Travis County | 43.6 |
| 38 | Bexar County | 43.3 |
| 39 | Dallas County | 40.5 |
| 39 | Nueces County | 40.5 |
| 41 | Montgomery County | 39.1 |
| 42 | Tarrant County | 31.8 |
| 43 | Cameron County | 29.9 |
| 44 | El Paso County | 18.1 |
| 45 | Harris County | 11 |