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

All 19 values come from U.S. Environmental Protection Agency for 2005, so the places are comparable. 10 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/mississippi-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Hinds County | 174 |
| 2 | DeSoto County | 172 |
| 3 | Forrest County | 156 |
| 3 | Harrison County | 156 |
| 3 | Lauderdale County | 156 |
| 6 | Jackson County | 147 |
| 7 | Lee County | 140 |
| 8 | Warren County | 137 |
| 9 | Hancock County | 136 |
| 10 | Bolivar County | 135 |
| 10 | Scott County | 135 |
| 12 | Jones County | 129 |
| 13 | Adams County | 126 |
| 14 | Yalobusha County | 122 |
| 15 | Lowndes County | 117 |
| 16 | Pearl River County | 106 |
| 17 | Grenada County | 95 |
| 18 | Rankin County | 64 |
| 19 | Marshall County | 47 |