Data / Highest daily Air Quality Index (US EPA) / Franklin County

Highest daily Air Quality Index (US EPA) in Franklin County

Highest daily Air Quality Index (US EPA) in Franklin County was 98 in 2011, according to the U.S. Environmental Protection Agency. That is up 15 from 2010.

2011, index98
Change on 2010+15
Series high1442001
Series low762009

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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Highest daily Air Quality Index (US EPA) in Franklin County, 1999 to 2011

608010012014016019992001200320052007200920111999: 100 index2000: 122 index2001: 144 index2002: 130 index2003: 103 index2004: 88 index2005: 134 index2006: 105 index2007: 122 index2008: 86 index2009: 76 index2010: 83 index2011: 98 index60801001201401601999200420111999: 100 index2000: 122 index2001: 144 index2002: 130 index2003: 103 index2004: 88 index2005: 134 index2006: 105 index2007: 122 index2008: 86 index2009: 76 index2010: 83 index2011: 98 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 13 values
Periodindex
201198
201083
200976
200886
2007122
2006105
2005134
200488
2003103
2002130
2001144
2000122
1999100

Franklin County compared with nearby places

Bell County: 97 indexBoone County: 115 indexBoyd County: 129 indexBullitt County: 187 indexCampbell County: 147 indexCarter County: 157 indexChristian County: 108 indexDaviess County: 147 indexEdmonson County: 108 indexFayette County: 133 indexFranklin County: 98 indexGreenup County: 151 indexHancock County: 129 indexHardin County: 112 indexHenderson County: 140 indexJefferson County: 177 indexJessamine County: 140 indexLivingston County: 122 indexMcCracken County: 159 indexMadison County: 77 indexMarshall County: 31 indexMorgan County: 108 indexOldham County: 179 indexPerry County: 87 indexPike County: 98 indexPulaski County: 144 indexSimpson County: 143 indexTrigg County: 112 indexWarren County: 100 indexWashington County: 112 index
  • Under 98
  • 98 to 110
  • 110 to 130
  • 130 to 140
  • 140 to 150
  • 150 and over
  • No data
Highest daily Air Quality Index (US EPA), 2011, index. Franklin 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/franklin-county-kentucky. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/franklin-county-kentucky.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/franklin-county-kentucky (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2011,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011}},
  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/highest-daily-air-quality-index/franklin-county-kentucky. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Franklin County, 1999 to 2011
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/highest-daily-air-quality-index/franklin-county-kentucky
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/franklin-county-kentucky.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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 highest daily Air Quality Index (US EPA) in Franklin County?

Highest daily Air Quality Index (US EPA) in Franklin County was 98 in 2011, according to the U.S. Environmental Protection Agency. That is up 15 from 2010.

Where does this figure come from?

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

What was the highest highest daily Air Quality Index (US EPA) in Franklin County?

144 in 2001, the highest value since 1999 in this series.

Related statistics for Franklin County

All statistics for Franklin County | Franklin County in figures