# Counties in Arkansas by highest daily Air Quality Index (US EPA), 2003

All 21 values come from U.S. Environmental Protection Agency for 2003, so the places are comparable. 5 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/arkansas-counties

| Rank | Place | index |
|---:|---|---:|
| 1 | Crittenden County | 203 |
| 2 | Newton County | 169 |
| 3 | Pulaski County | 151 |
| 4 | Clark County | 126 |
| 5 | Faulkner County | 108 |
| 5 | Montgomery County | 108 |
| 7 | Phillips County | 107 |
| 8 | Craighead County | 102 |
| 9 | Jefferson County | 100 |
| 10 | Arkansas County | 98 |
| 11 | Ashley County | 91 |
| 12 | Mississippi County | 90 |
| 12 | Pope County | 90 |
| 14 | Sebastian County | 89 |
| 15 | Washington County | 87 |
| 16 | Garland County | 85 |
| 17 | Polk County | 84 |
| 18 | Union County | 82 |
| 18 | White County | 82 |
| 20 | Miller County | 80 |
| 21 | Marion County | 68 |