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)

Fairfield County had the highest share of days with good air quality (US EPA AQI) of 27 counties in 2000, at 98.3%. Greenwood County had the lowest, at 13.7%. The median was 53.1%. Source: EPA.

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Highest98.3Fairfield County
Lowest13.7Greenwood County
Median53.127 counties

Map of counties, 2000

Abbeville County: 44.7 %Aiken County: 62.7 %Anderson County: 53.2 %Barnwell County: 66.5 %Beaufort County: 32.7 %Berkeley County: 75.3 %Charleston County: 22.4 %Cherokee County: 54.7 %Chester County: 53.3 %Chesterfield County: 23.3 %Colleton County: 55 %Darlington County: 66.4 %Edgefield County: 53.1 %Fairfield County: 98.3 %Florence County: 24.6 %Georgetown County: 70.7 %Greenville County: 19.1 %Greenwood County: 13.7 %Horry County: 40 %Lexington County: 47.7 %Oconee County: 57.6 %Pickens County: 40.2 %Richland County: 38.5 %Spartanburg County: 20.2 %Union County: 68.8 %Williamsburg County: 65 %York County: 45.2 %
  • Under 26
  • 26 to 45
  • 45 to 54
  • 54 to 66
  • 66 and over
  • No data
%, 2000. 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, 2000

Fairfield County: 98.3 %Fairfield County98.3Berkeley County: 75.3 %Berkeley County75.3Georgetown County: 70.7 %Georgetown County70.7Union County: 68.8 %Union County68.8Barnwell County: 66.5 %Barnwell County66.5Darlington County: 66.4 %Darlington County66.4Williamsburg County: 65 %Williamsburg County65Aiken County: 62.7 %Aiken County62.7Oconee County: 57.6 %Oconee County57.6Colleton County: 55 %Colleton County55Cherokee County: 54.7 %Cherokee County54.7Chester County: 53.3 %Chester County53.3Anderson County: 53.2 %Anderson County53.2Edgefield County: 53.1 %Edgefield County53.1Lexington County: 47.7 %Lexington County47.7York County: 45.2 %York County45.2Abbeville County: 44.7 %Abbeville County44.7Pickens County: 40.2 %Pickens County40.2Horry County: 40 %Horry County40Richland County: 38.5 %Richland County38.5Beaufort County: 32.7 %Beaufort County32.7Florence County: 24.6 %Florence County24.6Chesterfield County: 23.3 %Chesterfield County23.3Charleston County: 22.4 %Charleston County22.4Spartanburg County: 20.2 %Spartanburg County20.2Greenville County: 19.1 %Greenville County19.1Greenwood County: 13.7 %Greenwood County13.7Fairfield County: 98.3 %Fairfield County98.3Berkeley County: 75.3 %Berkeley County75.3Georgetown County: 70.7 %Georgetown County70.7Union County: 68.8 %Union County68.8Barnwell County: 66.5 %Barnwell County66.5Darlington County: 66.4 %Darlington County66.4Williamsburg County: 65 %Williamsburg County65Aiken County: 62.7 %Aiken County62.7Oconee County: 57.6 %Oconee County57.6Colleton County: 55 %Colleton County55Cherokee County: 54.7 %Cherokee County54.7Chester County: 53.3 %Chester County53.3Anderson County: 53.2 %Anderson County53.2Edgefield County: 53.1 %Edgefield County53.1Lexington County: 47.7 %Lexington County47.7York County: 45.2 %York County45.2Abbeville County: 44.7 %Abbeville County44.7Pickens County: 40.2 %Pickens County40.2Horry County: 40 %Horry County40Richland County: 38.5 %Richland County38.5Beaufort County: 32.7 %Beaufort County32.7Florence County: 24.6 %Florence County24.6Chesterfield County: 23.3 %Chesterfield County23.3Charleston County: 22.4 %Charleston County22.4Spartanburg County: 20.2 %Spartanburg County20.2Greenville County: 19.1 %Greenville County19.1Greenwood County: 13.7 %Greenwood County13.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2000 (%)Change on 1999
1Fairfield County98.3-1.7 pts
2Berkeley County75.3-0.8 pts
3Georgetown County70.7-1.3 pts
4Union County68.8-1.5 pts
5Barnwell County66.5-6.9 pts
6Darlington County66.4-0.2 pts
7Williamsburg County65-5.8 pts
8Aiken County62.7-10.4 pts
9Oconee County57.6+4.1 pts
10Colleton County55+7.7 pts
11Cherokee County54.7-2.1 pts
12Chester County53.3+8.7 pts
13Anderson County53.2-7.5 pts
14Edgefield County53.1-6.5 pts
15Lexington County47.7+6.6 pts
16York County45.2+1.8 pts
17Abbeville County44.7-2.8 pts
18Pickens County40.2+4.1 pts
19Horry County40n/a
20Richland County38.5-4.2 pts
21Beaufort County32.7-0.6 pts
22Florence County24.6-3.1 pts
23Chesterfield County23.3n/a
24Charleston County22.4-7.5 pts
25Spartanburg County20.2-2.8 pts
26Greenville County19.1-28.3 pts
27Greenwood County13.7-6.9 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. 1 counties with data in other periods have no value for 2000 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), 2000) [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), 2000. 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=2000. 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), 2000. 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=2000.

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), 2000 [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=2000 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_south_carolina_2000,
  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), 2000}},
  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=2000. 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), 2000
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=2000
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties?period=2000.
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)?

Fairfield County, with 98.3% in 2000, according to EPA.

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

Greenwood County, with 13.7% in 2000.

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 2000 and are not ranked.

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

Counties in South Carolina: more rankings