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

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

Highest daily Air Quality Index (US EPA) in Floyd County was 50 in 1999, according to the U.S. Environmental Protection Agency. That is up 14 from 1998.

1999, index50
Change on 1998+14
Series high1611982
Series low361998

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Highest daily Air Quality Index (US EPA) in Floyd County, 1981 to 1999

2550751001251501751981198319921994199619991981: 122 index1982: 161 index1983: 147 index1991: 65 index1992: 45 index1993: 50 index1994: 56 index1995: 75 index1996: 66 index1997: 52 index1998: 36 index1999: 50 index05010015020019811992199619991981: 122 index1982: 161 index1983: 147 index1991: 65 index1992: 45 index1993: 50 index1994: 56 index1995: 75 index1996: 66 index1997: 52 index1998: 36 index1999: 50 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 12 values
Periodindex
199950
199836
199752
199666
199575
199456
199350
199245
199165
1983147
1982161
1981122

Floyd County compared with nearby places

Bell County: 151 indexBoone County: 177 indexBoyd County: 187 indexBullitt County: 187 indexCampbell County: 166 indexCarter County: 190 indexChristian County: 204 indexDaviess County: 169 indexEdmonson County: 200 indexFayette County: 185 indexFloyd County: 50 indexFranklin County: 100 indexGraves County: 205 indexGreenup County: 201 indexHancock County: 190 indexHardin County: 192 indexHarlan County: 44 indexHenderson County: 185 indexJefferson County: 202 indexJessamine County: 177 indexKenton County: 177 indexLawrence County: 47 indexLivingston County: 206 indexMcCracken County: 192 indexMcLean County: 207 indexMadison County: 98 indexMarshall County: 59 indexMorgan County: 190 indexOldham County: 204 indexPerry County: 154 indexPike County: 171 indexPulaski County: 182 indexScott County: 190 indexSimpson County: 195 indexTrigg County: 200 indexWarren County: 114 indexWashington County: 204 indexWhitley County: 63 index
  • Under 100
  • 100 to 170
  • 170 to 190
  • 190 to 200
  • 200 and over
  • No data
Highest daily Air Quality Index (US EPA), 1999, index. Floyd 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), Floyd County, 1981 to 1999) [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), Floyd County, 1981 to 1999. 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/floyd-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), Floyd County, 1981 to 1999. 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/floyd-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), Floyd County, 1981 to 1999 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/floyd-county-kentucky (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_1999,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Floyd County, 1981 to 1999}},
  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/floyd-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), Floyd County, 1981 to 1999
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/floyd-county-kentucky
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/floyd-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 Floyd County?

Highest daily Air Quality Index (US EPA) in Floyd County was 50 in 1999, according to the U.S. Environmental Protection Agency. That is up 14 from 1998.

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 Floyd County?

161 in 1982, the highest value since 1981 in this series.

Related statistics for Floyd County

All statistics for Floyd County | Floyd County in figures