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), 2007

Berkeley County had the highest share of days with good air quality (US EPA AQI) of 25 counties in 2007, at 91.4%. Greenville County had the lowest, at 18.6%. The median was 56.6%. Source: EPA.

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Highest91.4Berkeley County
Lowest18.6Greenville County
Median56.625 counties

Map of counties, 2007

Abbeville County: 45.6 %Aiken County: 68 %Barnwell County: 75.1 %Beaufort County: 50.5 %Berkeley County: 91.4 %Charleston County: 35.3 %Cherokee County: 85.4 %Chester County: 56.6 %Chesterfield County: 58.6 %Colleton County: 77.7 %Darlington County: 65.7 %Edgefield County: 61.8 %Florence County: 34.5 %Georgetown County: 90.3 %Greenville County: 18.6 %Greenwood County: 31.3 %Horry County: 42.7 %Lexington County: 29.9 %Oconee County: 62.6 %Pickens County: 46.2 %Richland County: 25.5 %Spartanburg County: 30.1 %Union County: 53.6 %Williamsburg County: 72.2 %York County: 60.3 %
  • Under 34
  • 34 to 49
  • 49 to 61
  • 61 to 73
  • 73 and over
  • No data
%, 2007. 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, 2007

Berkeley County: 91.4 %Berkeley County91.4Georgetown County: 90.3 %Georgetown County90.3Cherokee County: 85.4 %Cherokee County85.4Colleton County: 77.7 %Colleton County77.7Barnwell County: 75.1 %Barnwell County75.1Williamsburg County: 72.2 %Williamsburg County72.2Aiken County: 68 %Aiken County68Darlington County: 65.7 %Darlington County65.7Oconee County: 62.6 %Oconee County62.6Edgefield County: 61.8 %Edgefield County61.8York County: 60.3 %York County60.3Chesterfield County: 58.6 %Chesterfield County58.6Chester County: 56.6 %Chester County56.6Union County: 53.6 %Union County53.6Beaufort County: 50.5 %Beaufort County50.5Pickens County: 46.2 %Pickens County46.2Abbeville County: 45.6 %Abbeville County45.6Horry County: 42.7 %Horry County42.7Charleston County: 35.3 %Charleston County35.3Florence County: 34.5 %Florence County34.5Greenwood County: 31.3 %Greenwood County31.3Spartanburg County: 30.1 %Spartanburg County30.1Lexington County: 29.9 %Lexington County29.9Richland County: 25.5 %Richland County25.5Greenville County: 18.6 %Greenville County18.6Berkeley County: 91.4 %Berkeley County91.4Georgetown County: 90.3 %Georgetown County90.3Cherokee County: 85.4 %Cherokee County85.4Colleton County: 77.7 %Colleton County77.7Barnwell County: 75.1 %Barnwell County75.1Williamsburg County: 72.2 %Williamsburg County72.2Aiken County: 68 %Aiken County68Darlington County: 65.7 %Darlington County65.7Oconee County: 62.6 %Oconee County62.6Edgefield County: 61.8 %Edgefield County61.8York County: 60.3 %York County60.3Chesterfield County: 58.6 %Chesterfield County58.6Chester County: 56.6 %Chester County56.6Union County: 53.6 %Union County53.6Beaufort County: 50.5 %Beaufort County50.5Pickens County: 46.2 %Pickens County46.2Abbeville County: 45.6 %Abbeville County45.6Horry County: 42.7 %Horry County42.7Charleston County: 35.3 %Charleston County35.3Florence County: 34.5 %Florence County34.5Greenwood County: 31.3 %Greenwood County31.3Spartanburg County: 30.1 %Spartanburg County30.1Lexington County: 29.9 %Lexington County29.9Richland County: 25.5 %Richland County25.5Greenville County: 18.6 %Greenville County18.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2007 (%)Change on 2006
1Berkeley County91.4+4 pts
2Georgetown County90.3+13.4 pts
3Cherokee County85.4+9.8 pts
4Colleton County77.7+1.8 pts
5Barnwell County75.1+0.6 pts
6Williamsburg County72.2-3.5 pts
7Aiken County68+4.4 pts
8Darlington County65.7+4.9 pts
9Oconee County62.6-8.2 pts
10Edgefield County61.8-7.6 pts
11York County60.3-13.9 pts
12Chesterfield County58.6+1.2 pts
13Chester County56.6-9.3 pts
14Union County53.6-5.2 pts
15Beaufort County50.5+4.8 pts
16Pickens County46.2-14.6 pts
17Abbeville County45.6-9.8 pts
18Horry County42.7+3.1 pts
19Charleston County35.3+6.8 pts
20Florence County34.5+5.3 pts
21Greenwood County31.3+5.7 pts
22Spartanburg County30.1+1.4 pts
23Lexington County29.9-25.1 pts
24Richland County25.5+5 pts
25Greenville County18.6+2.2 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. 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: 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), 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: 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), 2007. 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. 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), 2007. 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.

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), 2007 [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 (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: 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), 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/good-air-quality-days-share/south-carolina-counties. 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), 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/good-air-quality-days-share/south-carolina-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/south-carolina-counties.
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 91.4% in 2007, according to EPA.

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

Greenville County, with 18.6% 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: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 3 counties have no value for 2007 and are not ranked.

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

Counties in South Carolina: more rankings