# Counties in South Carolina by share of days with good air quality (US EPA AQI), 2007

All 25 values come from U.S. Environmental Protection Agency for 2007, so the places are comparable. 3 counties have no value for that period and are not ranked.

- Indicator id: `aqi_good_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Berkeley County | 91.4 |
| 2 | Georgetown County | 90.3 |
| 3 | Cherokee County | 85.4 |
| 4 | Colleton County | 77.7 |
| 5 | Barnwell County | 75.1 |
| 6 | Williamsburg County | 72.2 |
| 7 | Aiken County | 68 |
| 8 | Darlington County | 65.7 |
| 9 | Oconee County | 62.6 |
| 10 | Edgefield County | 61.8 |
| 11 | York County | 60.3 |
| 12 | Chesterfield County | 58.6 |
| 13 | Chester County | 56.6 |
| 14 | Union County | 53.6 |
| 15 | Beaufort County | 50.5 |
| 16 | Pickens County | 46.2 |
| 17 | Abbeville County | 45.6 |
| 18 | Horry County | 42.7 |
| 19 | Charleston County | 35.3 |
| 20 | Florence County | 34.5 |
| 21 | Greenwood County | 31.3 |
| 22 | Spartanburg County | 30.1 |
| 23 | Lexington County | 29.9 |
| 24 | Richland County | 25.5 |
| 25 | Greenville County | 18.6 |