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

All 18 values come from U.S. Environmental Protection Agency for 2005, so the places are comparable. 2 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/west-virginia-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Ohio County | 179 |
| 2 | Wood County | 169 |
| 3 | Berkeley County | 161 |
| 3 | Monongalia County | 161 |
| 5 | Kanawha County | 154 |
| 6 | Cabell County | 150 |
| 7 | Brooke County | 147 |
| 7 | Hancock County | 147 |
| 9 | Marshall County | 143 |
| 9 | Tucker County | 143 |
| 11 | Greenbrier County | 129 |
| 12 | Gilmer County | 122 |
| 12 | Marion County | 122 |
| 14 | Summers County | 118 |
| 15 | Harrison County | 113 |
| 16 | Mercer County | 96 |
| 17 | Raleigh County | 94 |
| 18 | Wayne County | 93 |