Data / Median Air Quality Index (US EPA) / Darlington County

Median Air Quality Index (US EPA) in Darlington County

Median Air Quality Index (US EPA) in Darlington County was 40 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024.

2025, index40
Change on 20240
Series high641980
Series low322020

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Median Air Quality Index (US EPA) in Darlington County, 1980 to 2025

304050607019801990199820042010201620251980: 64 index1981: 49 index1982: 41 index1984: 47 index1986: 58 index1988: 44 index1990: 49 index1993: 48 index1994: 39 index1995: 35 index1996: 37 index1997: 41 index1998: 42 index1999: 41 index2000: 42 index2001: 42 index2002: 38 index2003: 37 index2004: 37 index2005: 41 index2006: 47 index2007: 47 index2008: 45 index2009: 35 index2010: 41 index2011: 44 index2012: 39 index2013: 36 index2014: 41 index2015: 40 index2016: 39 index2017: 39 index2018: 40 index2019: 38 index2020: 32 index2021: 35 index2022: 36 index2023: 40 index2024: 40 index2025: 40 index304050607019802000201420251980: 64 index1981: 49 index1982: 41 index1984: 47 index1986: 58 index1988: 44 index1990: 49 index1993: 48 index1994: 39 index1995: 35 index1996: 37 index1997: 41 index1998: 42 index1999: 41 index2000: 42 index2001: 42 index2002: 38 index2003: 37 index2004: 37 index2005: 41 index2006: 47 index2007: 47 index2008: 45 index2009: 35 index2010: 41 index2011: 44 index2012: 39 index2013: 36 index2014: 41 index2015: 40 index2016: 39 index2017: 39 index2018: 40 index2019: 38 index2020: 32 index2021: 35 index2022: 36 index2023: 40 index2024: 40 index2025: 40 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 40 values
Periodindex
202540
202440
202340
202236
202135
202032
201938
201840
201739
201639
201540
201441
201336
201239
201144
201041
200935
200845
200747
200647
200541
200437
200337
200238
200142
200042
199941
199842
199741
199637
199535
199439
199348
199049
198844
198658
198447
198241
198149
198064

Darlington County compared with nearby places

Aiken County: 39 indexAnderson County: 40 indexBerkeley County: 35 indexCharleston County: 47 indexChesterfield County: 44 indexDarlington County: 40 indexEdgefield County: 43 indexFlorence County: 44 indexGreenville County: 47 indexHorry County: 39 indexRichland County: 47 indexSpartanburg County: 48 indexYork County: 43 index
  • Under 39
  • 39 to 42
  • 42 to 44
  • 44 to 47
  • 47 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Darlington County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Median Air Quality Index (US EPA), Darlington County, 1980 to 2025) [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, Median Air Quality Index (US EPA), Darlington County, 1980 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/darlington-county-south-carolina. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Darlington County, 1980 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/darlington-county-south-carolina.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Darlington County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/darlington-county-south-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Darlington County, 1980 to 2025}},
  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/en/median-air-quality-index/darlington-county-south-carolina. 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: Median Air Quality Index (US EPA), Darlington County, 1980 to 2025
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/en/median-air-quality-index/darlington-county-south-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/darlington-county-south-carolina.
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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Questions

What is the median Air Quality Index (US EPA) in Darlington County?

Median Air Quality Index (US EPA) in Darlington County was 40 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Darlington County?

64 in 1980, the highest value since 1980 in this series.

Related statistics for Darlington County

All statistics for Darlington County | Darlington County in figures