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

Median Air Quality Index (US EPA) in Fairfield County

Median Air Quality Index (US EPA) in Fairfield County was 13 in 2001, according to the U.S. Environmental Protection Agency. That is down 8 from 2000.

2001, index13
Change on 2000-8
Series high281991
Series low132001

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 Fairfield County, 1991 to 2001

10152025301991199319951997199920011991: 28 index1992: 21 index1993: 19 index1994: 21 index1995: 19 index1996: 22 index1997: 24 index1998: 24 index1999: 21 index2000: 21 index2001: 13 index10152025301991199520011991: 28 index1992: 21 index1993: 19 index1994: 21 index1995: 19 index1996: 22 index1997: 24 index1998: 24 index1999: 21 index2000: 21 index2001: 13 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
200113
200021
199921
199824
199724
199622
199519
199421
199319
199221
199128

Fairfield County compared with nearby places

Abbeville County: 50 indexAiken County: 42 indexAnderson County: 49 indexBarnwell County: 39 indexBeaufort County: 54 indexBerkeley County: 36 indexCharleston County: 57 indexCherokee County: 44 indexChester County: 49 indexChesterfield County: 56 indexColleton County: 44 indexDarlington County: 42 indexEdgefield County: 44 indexFairfield County: 13 indexFlorence County: 57 indexGeorgetown County: 31 indexGreenville County: 61 indexGreenwood County: 57 indexHorry County: 55 indexLexington County: 47 indexOconee County: 46 indexPickens County: 49 indexRichland County: 53 indexSpartanburg County: 59 indexUnion County: 43 indexWilliamsburg County: 40 indexYork County: 48 index
  • Under 42
  • 42 to 45
  • 45 to 49
  • 49 to 56
  • 56 and over
  • No data
Median Air Quality Index (US EPA), 2001, index. Fairfield 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), Fairfield County, 1991 to 2001) [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), Fairfield County, 1991 to 2001. 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/fairfield-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), Fairfield County, 1991 to 2001. 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/fairfield-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), Fairfield County, 1991 to 2001 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/fairfield-county-south-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2001,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Fairfield County, 1991 to 2001}},
  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/fairfield-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), Fairfield County, 1991 to 2001
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/fairfield-county-south-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/fairfield-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 Fairfield County?

Median Air Quality Index (US EPA) in Fairfield County was 13 in 2001, according to the U.S. Environmental Protection Agency. That is down 8 from 2000.

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 Fairfield County?

28 in 1991, the highest value since 1991 in this series.

Related statistics for Fairfield County

All statistics for Fairfield County | Fairfield County in figures