# Counties in Kansas by highest daily Air Quality Index (US EPA), 2009

All 15 values come from U.S. Environmental Protection Agency for 2009, so the places are comparable. 8 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/kansas-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Sedgwick County | 174 |
| 2 | Sumner County | 136 |
| 3 | Johnson County | 129 |
| 4 | Trego County | 112 |
| 5 | Wyandotte County | 108 |
| 6 | Brown County | 107 |
| 7 | Linn County | 101 |
| 7 | Shawnee County | 101 |
| 9 | Riley County | 97 |
| 10 | Leavenworth County | 90 |
| 11 | Chase County | 69 |
| 12 | Ford County | 66 |
| 13 | Sherman County | 61 |
| 14 | Montgomery County | 55 |
| 15 | Neosho County | 49 |