Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in South Carolina

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

Berkeley County had the highest share of days with good air quality (US EPA AQI) of 26 counties in 2006, at 87.4%. Greenville County had the lowest, at 16.4%. The median was 60.8%. Source: EPA.

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Highest87.4Berkeley County
Lowest16.4Greenville County
Median60.826 counties

Map of counties, 2006

Abbeville County: 55.4 %Aiken County: 63.6 %Anderson County: 82.8 %Barnwell County: 74.5 %Beaufort County: 45.7 %Berkeley County: 87.4 %Charleston County: 28.5 %Cherokee County: 75.6 %Chester County: 65.9 %Chesterfield County: 57.4 %Colleton County: 75.9 %Darlington County: 60.8 %Edgefield County: 69.4 %Florence County: 29.2 %Georgetown County: 76.9 %Greenville County: 16.4 %Greenwood County: 25.6 %Horry County: 39.6 %Lexington County: 55 %Oconee County: 70.8 %Pickens County: 60.8 %Richland County: 20.5 %Spartanburg County: 28.7 %Union County: 58.8 %Williamsburg County: 75.7 %York County: 74.2 %
  • Under 29
  • 29 to 57
  • 57 to 66
  • 66 to 76
  • 76 and over
  • No data
%, 2006. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2006

Berkeley County: 87.4 %Berkeley County87.4Anderson County: 82.8 %Anderson County82.8Georgetown County: 76.9 %Georgetown County76.9Colleton County: 75.9 %Colleton County75.9Williamsburg County: 75.7 %Williamsburg County75.7Cherokee County: 75.6 %Cherokee County75.6Barnwell County: 74.5 %Barnwell County74.5York County: 74.2 %York County74.2Oconee County: 70.8 %Oconee County70.8Edgefield County: 69.4 %Edgefield County69.4Chester County: 65.9 %Chester County65.9Aiken County: 63.6 %Aiken County63.6Darlington County: 60.8 %Darlington County60.8Pickens County: 60.8 %Pickens County60.8Union County: 58.8 %Union County58.8Chesterfield County: 57.4 %Chesterfield County57.4Abbeville County: 55.4 %Abbeville County55.4Lexington County: 55 %Lexington County55Beaufort County: 45.7 %Beaufort County45.7Horry County: 39.6 %Horry County39.6Florence County: 29.2 %Florence County29.2Spartanburg County: 28.7 %Spartanburg County28.7Charleston County: 28.5 %Charleston County28.5Greenwood County: 25.6 %Greenwood County25.6Richland County: 20.5 %Richland County20.5Greenville County: 16.4 %Greenville County16.4Berkeley County: 87.4 %Berkeley County87.4Anderson County: 82.8 %Anderson County82.8Georgetown County: 76.9 %Georgetown County76.9Colleton County: 75.9 %Colleton County75.9Williamsburg County: 75.7 %Williamsburg County75.7Cherokee County: 75.6 %Cherokee County75.6Barnwell County: 74.5 %Barnwell County74.5York County: 74.2 %York County74.2Oconee County: 70.8 %Oconee County70.8Edgefield County: 69.4 %Edgefield County69.4Chester County: 65.9 %Chester County65.9Aiken County: 63.6 %Aiken County63.6Darlington County: 60.8 %Darlington County60.8Pickens County: 60.8 %Pickens County60.8Union County: 58.8 %Union County58.8Chesterfield County: 57.4 %Chesterfield County57.4Abbeville County: 55.4 %Abbeville County55.4Lexington County: 55 %Lexington County55Beaufort County: 45.7 %Beaufort County45.7Horry County: 39.6 %Horry County39.6Florence County: 29.2 %Florence County29.2Spartanburg County: 28.7 %Spartanburg County28.7Charleston County: 28.5 %Charleston County28.5Greenwood County: 25.6 %Greenwood County25.6Richland County: 20.5 %Richland County20.5Greenville County: 16.4 %Greenville County16.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2006 (%)Change on 2005
1Berkeley County87.40 pts
2Anderson County82.8+28.8 pts
3Georgetown County76.9+13.1 pts
4Colleton County75.9-3.7 pts
5Williamsburg County75.7-3.9 pts
6Cherokee County75.6-2.1 pts
7Barnwell County74.5-7.7 pts
8York County74.2+2.5 pts
9Oconee County70.8-1.1 pts
10Edgefield County69.4+4.3 pts
11Chester County65.9+2.9 pts
12Aiken County63.6+0.5 pts
13Darlington County60.8-13.7 pts
13Pickens County60.8-4.6 pts
15Union County58.8-10.6 pts
16Chesterfield County57.4-6.9 pts
17Abbeville County55.4-7.6 pts
18Lexington County55-5.8 pts
19Beaufort County45.7+11.3 pts
20Horry County39.6+7.7 pts
21Florence County29.2-3.8 pts
22Spartanburg County28.7+4.7 pts
23Charleston County28.5+2.7 pts
24Greenwood County25.6+0.4 pts
25Richland County20.5-0.3 pts
26Greenville County16.4-0.9 pts

Other periods

About this ranking

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.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 2 counties with data in other periods have no value for 2006 and are left out rather than filled from another source. Equal values share a rank.

How to cite

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.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_south_carolina_2006,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006. Publisher attribution: 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.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in South Carolina by share of days with good air quality (US EPA AQI), 2006
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2006.
N1  - Publisher attribution: 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.
ER  -
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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Berkeley County, with 87.4% in 2006, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Greenville County, with 16.4% in 2006.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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. Retrieved 2026-10-12. 2 counties have no value for 2006 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in South Carolina: more rankings