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

Counties in South Carolina by median Air Quality Index (US EPA), 2007

Greenville County had the highest median Air Quality Index (US EPA) of 25 counties in 2007, at 61. Georgetown County had the lowest, at 26. The median was 48. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest61Greenville County
Lowest26Georgetown County
Median4825 counties

Map of counties, 2007

Abbeville County: 51 indexAiken County: 42 indexBarnwell County: 40 indexBeaufort County: 50 indexBerkeley County: 36 indexCharleston County: 55 indexCherokee County: 39 indexChester County: 48 indexChesterfield County: 47 indexColleton County: 41 indexDarlington County: 47 indexEdgefield County: 44 indexFlorence County: 55 indexGeorgetown County: 26 indexGreenville County: 61 indexGreenwood County: 57 indexHorry County: 52 indexLexington County: 57 indexOconee County: 45 indexPickens County: 51 indexRichland County: 60 indexSpartanburg County: 59 indexUnion County: 50 indexWilliamsburg County: 44 indexYork County: 47 index
  • Under 42
  • 42 to 47
  • 47 to 50
  • 50 to 55
  • 55 and over
  • No data
index, 2007. 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, 2007

Greenville County: 61 indexGreenville County61Richland County: 60 indexRichland County60Spartanburg County: 59 indexSpartanburg County59Greenwood County: 57 indexGreenwood County57Lexington County: 57 indexLexington County57Charleston County: 55 indexCharleston County55Florence County: 55 indexFlorence County55Horry County: 52 indexHorry County52Abbeville County: 51 indexAbbeville County51Pickens County: 51 indexPickens County51Beaufort County: 50 indexBeaufort County50Union County: 50 indexUnion County50Chester County: 48 indexChester County48Chesterfield County: 47 indexChesterfield County47Darlington County: 47 indexDarlington County47York County: 47 indexYork County47Oconee County: 45 indexOconee County45Edgefield County: 44 indexEdgefield County44Williamsburg County: 44 indexWilliamsburg County44Aiken County: 42 indexAiken County42Colleton County: 41 indexColleton County41Barnwell County: 40 indexBarnwell County40Cherokee County: 39 indexCherokee County39Berkeley County: 36 indexBerkeley County36Georgetown County: 26 indexGeorgetown County26Greenville County: 61 indexGreenville County61Richland County: 60 indexRichland County60Spartanburg County: 59 indexSpartanburg County59Greenwood County: 57 indexGreenwood County57Lexington County: 57 indexLexington County57Charleston County: 55 indexCharleston County55Florence County: 55 indexFlorence County55Horry County: 52 indexHorry County52Abbeville County: 51 indexAbbeville County51Pickens County: 51 indexPickens County51Beaufort County: 50 indexBeaufort County50Union County: 50 indexUnion County50Chester County: 48 indexChester County48Chesterfield County: 47 indexChesterfield County47Darlington County: 47 indexDarlington County47York County: 47 indexYork County47Oconee County: 45 indexOconee County45Edgefield County: 44 indexEdgefield County44Williamsburg County: 44 indexWilliamsburg County44Aiken County: 42 indexAiken County42Colleton County: 41 indexColleton County41Barnwell County: 40 indexBarnwell County40Cherokee County: 39 indexCherokee County39Berkeley County: 36 indexBerkeley County36Georgetown County: 26 indexGeorgetown County26
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2007
index		Change on 2006
1Greenville County61-3
2Richland County60-1
3Spartanburg County59-1
4Greenwood County57-1
4Lexington County57+11
6Charleston County55-2
6Florence County55-2
8Horry County52-1
9Abbeville County51+3
9Pickens County51+4
11Beaufort County50-2
11Union County50+4
13Chester County48+4
14Chesterfield County47+1
14Darlington County470
14York County47+7
17Oconee County45+1
18Edgefield County44+1
18Williamsburg County44+4
20Aiken County42-1
21Colleton County41+1
22Barnwell County40+1
23Cherokee County39-1
24Berkeley County360
25Georgetown County26-5

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. 3 counties with data in other periods have no value for 2007 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), 2007) [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), 2007. 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. 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), 2007. 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.

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), 2007 [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 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_south_carolina_2007,
  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), 2007}},
  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. 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), 2007
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/south-carolina-counties.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

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}
GET https://invokely.ai/api/v1/rank?indicator=aqi_median&level=province&within=South%20Carolina&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

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

Greenville County, with 61 in 2007, according to the U.S. Environmental Protection Agency.

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

Georgetown County, with 26 in 2007.

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. 3 counties have no value for 2007 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in South Carolina: more rankings