# Counties in Alabama by median 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_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/alabama-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Jefferson County | 77 |
| 2 | Walker County | 58 |
| 3 | Escambia County | 57 |
| 4 | Barbour County | 55 |
| 5 | Shelby County | 54 |
| 6 | Russell County | 52 |
| 7 | Morgan County | 51 |
| 8 | Etowah County | 50 |
| 8 | Tuscaloosa County | 50 |
| 10 | Baldwin County | 49 |
| 10 | Clay County | 49 |
| 10 | Colbert County | 49 |
| 10 | Montgomery County | 49 |
| 14 | Houston County | 47 |
| 14 | Lawrence County | 47 |
| 16 | Madison County | 46 |
| 16 | Mobile County | 46 |
| 18 | DeKalb County | 44 |
| 18 | Sumter County | 44 |
| 18 | Talladega County | 44 |
| 21 | Elmore County | 42 |
| 22 | Jackson County | 28 |
| 23 | Marengo County | 19 |
| 23 | Pike County | 19 |