# Counties in Texas by median Air Quality Index (US EPA), 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_median`
- Unit: index
- Definition: Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries. The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide). Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: median daily AQI (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Publisher page: https://invokely.ai/en/publishers/environmental-protection-agency
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/median-air-quality-index/texas-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | El Paso County | 70 |
| 2 | Harris County | 62 |
| 3 | Cameron County | 57 |
| 4 | Tarrant County | 56 |
| 5 | Dallas County | 53 |
| 5 | Montgomery County | 53 |
| 5 | Nueces County | 53 |
| 5 | Travis County | 53 |
| 9 | Bexar County | 52 |
| 9 | Hidalgo County | 52 |
| 11 | Jefferson County | 51 |
| 11 | McLennan County | 51 |
| 11 | Webb County | 51 |
| 14 | Kleberg County | 49 |
| 15 | Bowie County | 48 |
| 16 | Denton County | 47 |
| 16 | Navarro County | 47 |
| 18 | Bell County | 45 |
| 18 | Galveston County | 45 |
| 18 | Orange County | 45 |
| 21 | Harrison County | 44 |
| 21 | Kaufman County | 44 |
| 23 | Brewster County | 43 |
| 24 | Maverick County | 42 |
| 25 | Randall County | 41 |
| 26 | Brazos County | 40 |
| 26 | Collin County | 40 |
| 28 | Ector County | 39 |
| 29 | Hood County | 38 |
| 29 | Parker County | 38 |
| 31 | Johnson County | 37 |
| 32 | Gregg County | 36 |
| 33 | Atascosa County | 35 |
| 33 | Brazoria County | 35 |
| 33 | Ellis County | 35 |
| 33 | Smith County | 35 |
| 37 | Hunt County | 34 |
| 37 | Victoria County | 34 |
| 39 | Polk County | 33 |
| 40 | Culberson County | 32 |
| 41 | Rockwall County | 31 |
| 42 | Lubbock County | 24 |
| 43 | Potter County | 16 |
| 44 | Wilson County | 8 |
| 45 | Karnes County | 6 |