| # | County | Median AQI |
|---|---|---|
| 1 | El Paso County | 67 |
| 2 | Cameron County | 61 |
| 3 | Harris County | 61 |
| 4 | Dallas County | 55 |
| 5 | Montgomery County | 55 |
| 6 | Hidalgo County | 54 |
| 7 | Tarrant County | 54 |
| 8 | Jefferson County | 53 |
| 9 | McLennan County | 53 |
| 10 | Bexar County | 52 |
| 11 | Travis County | 52 |
| 12 | Nueces County | 51 |
| 13 | Bowie County | 49 |
| 14 | Navarro County | 48 |
| 15 | Denton County | 47 |
| 16 | Bell County | 46 |
| 17 | Kaufman County | 46 |
| 18 | Webb County | 45 |
| 19 | Atascosa County | 44 |
| 20 | Galveston County | 44 |
| 21 | Harrison County | 44 |
| 22 | Orange County | 44 |
| 23 | Brewster County | 43 |
| 24 | Kleberg County | 43 |
| 25 | Randall County | 43 |
Source: EPA Air Quality Index annual summary (2024). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties with the Worst Air Quality in Texas”, https://gismap.land/rankings/texas/worst-air-quality-counties. Figures from EPA Air Quality Index annual summary (2024).
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