Data / Rankings / Median Air Quality Index (US EPA) / Counties in South Carolina

Counties in South Carolina by median Air Quality Index (US EPA)

Greenville County had the highest median Air Quality Index (US EPA) of 27 counties in 2000, at 63. Fairfield County had the lowest, at 21. The median was 50. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest63Greenville County
Lowest21Fairfield County
Median5027 counties

Map of counties, 2000

Abbeville County: 54 indexAiken County: 41 indexAnderson County: 48 indexBarnwell County: 41 indexBeaufort County: 55 indexBerkeley County: 38 indexCharleston County: 59 indexCherokee County: 47 indexChester County: 50 indexChesterfield County: 56 indexColleton County: 49 indexDarlington County: 42 indexEdgefield County: 48 indexFairfield County: 21 indexFlorence County: 59 indexGeorgetown County: 34 indexGreenville County: 63 indexGreenwood County: 60 indexHorry County: 52 indexLexington County: 52 indexOconee County: 45 indexPickens County: 61 indexRichland County: 58 indexSpartanburg County: 62 indexUnion County: 41 indexWilliamsburg County: 45 indexYork County: 53 index
  • Under 41
  • 41 to 48
  • 48 to 53
  • 53 to 59
  • 59 and over
  • No data
index, 2000. Hatched areas have no value for this period. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2000

Greenville County: 63 indexGreenville County63Spartanburg County: 62 indexSpartanburg County62Pickens County: 61 indexPickens County61Greenwood County: 60 indexGreenwood County60Charleston County: 59 indexCharleston County59Florence County: 59 indexFlorence County59Richland County: 58 indexRichland County58Chesterfield County: 56 indexChesterfield County56Beaufort County: 55 indexBeaufort County55Abbeville County: 54 indexAbbeville County54York County: 53 indexYork County53Horry County: 52 indexHorry County52Lexington County: 52 indexLexington County52Chester County: 50 indexChester County50Colleton County: 49 indexColleton County49Anderson County: 48 indexAnderson County48Edgefield County: 48 indexEdgefield County48Cherokee County: 47 indexCherokee County47Oconee County: 45 indexOconee County45Williamsburg County: 45 indexWilliamsburg County45Darlington County: 42 indexDarlington County42Aiken County: 41 indexAiken County41Barnwell County: 41 indexBarnwell County41Union County: 41 indexUnion County41Berkeley County: 38 indexBerkeley County38Georgetown County: 34 indexGeorgetown County34Fairfield County: 21 indexFairfield County21Greenville County: 63 indexGreenville County63Spartanburg County: 62 indexSpartanburg County62Pickens County: 61 indexPickens County61Greenwood County: 60 indexGreenwood County60Charleston County: 59 indexCharleston County59Florence County: 59 indexFlorence County59Richland County: 58 indexRichland County58Chesterfield County: 56 indexChesterfield County56Beaufort County: 55 indexBeaufort County55Abbeville County: 54 indexAbbeville County54York County: 53 indexYork County53Horry County: 52 indexHorry County52Lexington County: 52 indexLexington County52Chester County: 50 indexChester County50Colleton County: 49 indexColleton County49Anderson County: 48 indexAnderson County48Edgefield County: 48 indexEdgefield County48Cherokee County: 47 indexCherokee County47Oconee County: 45 indexOconee County45Williamsburg County: 45 indexWilliamsburg County45Darlington County: 42 indexDarlington County42Aiken County: 41 indexAiken County41Barnwell County: 41 indexBarnwell County41Union County: 41 indexUnion County41Berkeley County: 38 indexBerkeley County38Georgetown County: 34 indexGeorgetown County34Fairfield County: 21 indexFairfield County21
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2000
index		Change on 1999
1Greenville County63+11
2Spartanburg County62-1
3Pickens County61-6
4Greenwood County60-1
5Charleston County59+2
5Florence County59-1
7Richland County58+3
8Chesterfield County56n/a
9Beaufort County550
10Abbeville County540
11York County53-2
12Horry County52n/a
12Lexington County52-3
14Chester County50-8
15Colleton County49-5
16Anderson County48+4
16Edgefield County48+3
18Cherokee County47+1
19Oconee County45-3
19Williamsburg County45+4
21Darlington County42+1
22Aiken County41+6
22Barnwell County41+3
22Union County410
25Berkeley County38+2
26Georgetown County34+1
27Fairfield County210

Other periods

About this ranking

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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: median daily AQI. 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: median daily AQI (Counties in South Carolina by median Air Quality Index (US EPA), 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: median daily AQI, Counties in South Carolina by median Air Quality Index (US EPA), 2000. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/median-air-quality-index/south-carolina-counties?period=2000. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Counties in South Carolina by median Air Quality Index (US EPA), 2000. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/median-air-quality-index/south-carolina-counties?period=2000.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in South Carolina by median Air Quality Index (US EPA), 2000 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/median-air-quality-index/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: median daily AQI: Counties in South Carolina by median Air Quality Index (US EPA), 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/median-air-quality-index/south-carolina-counties?period=2000. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI: Counties in South Carolina by median Air Quality Index (US EPA), 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/median-air-quality-index/south-carolina-counties?period=2000
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/south-carolina-counties?period=2000.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Rank Counties in South Carolina by median Air Quality Index (US EPA) using official data, and cite the source.
rank_places {"indicator":"aqi_median","level":"province","within":"South Carolina","limit":10}
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Questions

Which county has the highest median Air Quality Index (US EPA)?

Greenville County, with 63 in 2000, according to the U.S. Environmental Protection Agency.

Which county has the lowest median Air Quality Index (US EPA)?

Fairfield County, with 21 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: median daily AQI. Retrieved 2026-10-12. 1 counties have no value for 2000 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in South Carolina: more rankings