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 27 counties in 2002, at 78%. Greenville County had the lowest, at 21.9%. The median was 58%. Source: EPA.

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Highest78Berkeley County
Lowest21.9Greenville County
Median5827 counties

Map of counties, 2002

Abbeville County: 54 %Aiken County: 71.7 %Anderson County: 55.1 %Barnwell County: 77.5 %Beaufort County: 45.8 %Berkeley County: 78 %Charleston County: 31.2 %Cherokee County: 68.5 %Chester County: 54.1 %Chesterfield County: 51.3 %Colleton County: 66.7 %Darlington County: 72.2 %Edgefield County: 61 %Florence County: 39.1 %Georgetown County: 70.1 %Greenville County: 21.9 %Greenwood County: 30.4 %Horry County: 40 %Lexington County: 63 %Oconee County: 61.1 %Orangeburg County: 56.4 %Pickens County: 59.1 %Richland County: 25.2 %Spartanburg County: 28.8 %Union County: 58 %Williamsburg County: 71.5 %York County: 58.2 %
  • Under 39
  • 39 to 55
  • 55 to 60
  • 60 to 70
  • 70 and over
  • No data
%, 2002. 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, 2002

Berkeley County: 78 %Berkeley County78Barnwell County: 77.5 %Barnwell County77.5Darlington County: 72.2 %Darlington County72.2Aiken County: 71.7 %Aiken County71.7Williamsburg County: 71.5 %Williamsburg County71.5Georgetown County: 70.1 %Georgetown County70.1Cherokee County: 68.5 %Cherokee County68.5Colleton County: 66.7 %Colleton County66.7Lexington County: 63 %Lexington County63Oconee County: 61.1 %Oconee County61.1Edgefield County: 61 %Edgefield County61Pickens County: 59.1 %Pickens County59.1York County: 58.2 %York County58.2Union County: 58 %Union County58Orangeburg County: 56.4 %Orangeburg County56.4Anderson County: 55.1 %Anderson County55.1Chester County: 54.1 %Chester County54.1Abbeville County: 54 %Abbeville County54Chesterfield County: 51.3 %Chesterfield County51.3Beaufort County: 45.8 %Beaufort County45.8Horry County: 40 %Horry County40Florence County: 39.1 %Florence County39.1Charleston County: 31.2 %Charleston County31.2Greenwood County: 30.4 %Greenwood County30.4Spartanburg County: 28.8 %Spartanburg County28.8Richland County: 25.2 %Richland County25.2Greenville County: 21.9 %Greenville County21.9Berkeley County: 78 %Berkeley County78Barnwell County: 77.5 %Barnwell County77.5Darlington County: 72.2 %Darlington County72.2Aiken County: 71.7 %Aiken County71.7Williamsburg County: 71.5 %Williamsburg County71.5Georgetown County: 70.1 %Georgetown County70.1Cherokee County: 68.5 %Cherokee County68.5Colleton County: 66.7 %Colleton County66.7Lexington County: 63 %Lexington County63Oconee County: 61.1 %Oconee County61.1Edgefield County: 61 %Edgefield County61Pickens County: 59.1 %Pickens County59.1York County: 58.2 %York County58.2Union County: 58 %Union County58Orangeburg County: 56.4 %Orangeburg County56.4Anderson County: 55.1 %Anderson County55.1Chester County: 54.1 %Chester County54.1Abbeville County: 54 %Abbeville County54Chesterfield County: 51.3 %Chesterfield County51.3Beaufort County: 45.8 %Beaufort County45.8Horry County: 40 %Horry County40Florence County: 39.1 %Florence County39.1Charleston County: 31.2 %Charleston County31.2Greenwood County: 30.4 %Greenwood County30.4Spartanburg County: 28.8 %Spartanburg County28.8Richland County: 25.2 %Richland County25.2Greenville County: 21.9 %Greenville County21.9
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2002 (%)Change on 2001
1Berkeley County78-4.9 pts
2Barnwell County77.5-0.2 pts
3Darlington County72.2+4.4 pts
4Aiken County71.7+1.6 pts
5Williamsburg County71.5-12.4 pts
6Georgetown County70.1-4.7 pts
7Cherokee County68.5+2.4 pts
8Colleton County66.7+0.2 pts
9Lexington County63+7.6 pts
10Oconee County61.1-2.5 pts
11Edgefield County61-2.6 pts
12Pickens County59.1+4.9 pts
13York County58.2+4.5 pts
14Union County58-10.2 pts
15Orangeburg County56.4n/a
16Anderson County55.1+1.4 pts
17Chester County54.1+0.5 pts
18Abbeville County54+1 pts
19Chesterfield County51.3+19.4 pts
20Beaufort County45.8+8.3 pts
21Horry County40+4 pts
22Florence County39.1+9.5 pts
23Charleston County31.2+3 pts
24Greenwood County30.4+5 pts
25Spartanburg County28.8+4.1 pts
26Richland County25.2-17.3 pts
27Greenville County21.9+0.5 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. 1 counties with data in other periods have no value for 2002 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), 2002) [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), 2002. 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=2002. 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), 2002. 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=2002.

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), 2002 [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=2002 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_south_carolina_2002,
  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), 2002}},
  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=2002. 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), 2002
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=2002
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2002.
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 78% in 2002, according to EPA.

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

Greenville County, with 21.9% in 2002.

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. 1 counties have no value for 2002 and are not ranked.

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

Counties in South Carolina: more rankings