# Counties in Alabama by highest daily Air Quality Index (US EPA), 2005

All 24 values come from U.S. Environmental Protection Agency for 2005, so the places are comparable. 7 counties have no value for that period and are not ranked.

- Indicator id: `aqi_max`
- Unit: index
- Definition: Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: highest 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: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/highest-daily-air-quality-index/alabama-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Shelby County | 179 |
| 2 | Jefferson County | 177 |
| 3 | Tuscaloosa County | 164 |
| 4 | Russell County | 156 |
| 5 | Mobile County | 154 |
| 6 | Baldwin County | 147 |
| 7 | DeKalb County | 140 |
| 8 | Clay County | 136 |
| 8 | Morgan County | 136 |
| 10 | Madison County | 133 |
| 10 | Montgomery County | 133 |
| 12 | Colbert County | 126 |
| 12 | Lawrence County | 126 |
| 14 | Houston County | 124 |
| 15 | Etowah County | 120 |
| 16 | Barbour County | 119 |
| 17 | Sumter County | 117 |
| 18 | Walker County | 113 |
| 19 | Talladega County | 110 |
| 20 | Elmore County | 101 |
| 21 | Escambia County | 98 |
| 22 | Pike County | 51 |
| 23 | Marengo County | 49 |
| 24 | Jackson County | 39 |