Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Kentucky

Counties in Kentucky by share of days with good air quality (US EPA AQI)

Floyd County had the highest share of days with good air quality (US EPA AQI) of 37 counties in 1993, at 100%. Greenup County had the lowest, at 61.2%. The median was 75.3%. Source: EPA.

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Highest100Floyd County
Lowest61.2Greenup County
Median75.337 counties

Map of counties, 1993

Bell County: 76.4 %Boone County: 65.1 %Boyd County: 69.9 %Bullitt County: 77.8 %Campbell County: 81.4 %Carter County: 96.6 %Christian County: 76.7 %Daviess County: 79.2 %Edmonson County: 67.1 %Fayette County: 69.9 %Floyd County: 100 %Graves County: 80.4 %Greenup County: 61.2 %Hancock County: 70.1 %Hardin County: 71.6 %Harlan County: 95 %Henderson County: 75.3 %Jefferson County: 70.1 %Jessamine County: 68.7 %Kenton County: 74.8 %Lawrence County: 71.7 %Livingston County: 64.2 %McCracken County: 88.8 %McLean County: 66.7 %Madison County: 98.3 %Marshall County: 91.1 %Morgan County: 83.7 %Oldham County: 68.2 %Perry County: 76.4 %Pike County: 71.6 %Pulaski County: 69.9 %Scott County: 66.3 %Simpson County: 82.6 %Trigg County: 95.3 %Warren County: 96.6 %Washington County: 64 %Whitley County: 100 %
  • Under 67
  • 67 to 70
  • 70 to 75
  • 75 to 80
  • 80 to 95
  • 95 and over
  • No data
%, 1993. 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, 1993

Floyd County: 100 %Floyd County100Whitley County: 100 %Whitley County100Madison County: 98.3 %Madison County98.3Carter County: 96.6 %Carter County96.6Warren County: 96.6 %Warren County96.6Trigg County: 95.3 %Trigg County95.3Harlan County: 95 %Harlan County95Marshall County: 91.1 %Marshall County91.1McCracken County: 88.8 %McCracken County88.8Morgan County: 83.7 %Morgan County83.7Simpson County: 82.6 %Simpson County82.6Campbell County: 81.4 %Campbell County81.4Graves County: 80.4 %Graves County80.4Daviess County: 79.2 %Daviess County79.2Bullitt County: 77.8 %Bullitt County77.8Christian County: 76.7 %Christian County76.7Bell County: 76.4 %Bell County76.4Perry County: 76.4 %Perry County76.4Henderson County: 75.3 %Henderson County75.3Kenton County: 74.8 %Kenton County74.8Lawrence County: 71.7 %Lawrence County71.7Hardin County: 71.6 %Hardin County71.6Pike County: 71.6 %Pike County71.6Hancock County: 70.1 %Hancock County70.1Jefferson County: 70.1 %Jefferson County70.1Boyd County: 69.9 %Boyd County69.9Fayette County: 69.9 %Fayette County69.9Pulaski County: 69.9 %Pulaski County69.9Jessamine County: 68.7 %Jessamine County68.7Oldham County: 68.2 %Oldham County68.2Edmonson County: 67.1 %Edmonson County67.1McLean County: 66.7 %McLean County66.7Scott County: 66.3 %Scott County66.3Boone County: 65.1 %Boone County65.1Livingston County: 64.2 %Livingston County64.2Washington County: 64 %Washington County64Greenup County: 61.2 %Greenup County61.2Floyd County: 100 %Floyd County100Whitley County: 100 %Whitley County100Madison County: 98.3 %Madison County98.3Carter County: 96.6 %Carter County96.6Warren County: 96.6 %Warren County96.6Trigg County: 95.3 %Trigg County95.3Harlan County: 95 %Harlan County95Marshall County: 91.1 %Marshall County91.1McCracken County: 88.8 %McCracken County88.8Morgan County: 83.7 %Morgan County83.7Simpson County: 82.6 %Simpson County82.6Campbell County: 81.4 %Campbell County81.4Graves County: 80.4 %Graves County80.4Daviess County: 79.2 %Daviess County79.2Bullitt County: 77.8 %Bullitt County77.8Christian County: 76.7 %Christian County76.7Bell County: 76.4 %Bell County76.4Perry County: 76.4 %Perry County76.4Henderson County: 75.3 %Henderson County75.3Kenton County: 74.8 %Kenton County74.8Lawrence County: 71.7 %Lawrence County71.7Hardin County: 71.6 %Hardin County71.6Pike County: 71.6 %Pike County71.6Hancock County: 70.1 %Hancock County70.1Jefferson County: 70.1 %Jefferson County70.1Boyd County: 69.9 %Boyd County69.9Fayette County: 69.9 %Fayette County69.9Pulaski County: 69.9 %Pulaski County69.9Jessamine County: 68.7 %Jessamine County68.7Oldham County: 68.2 %Oldham County68.2Edmonson County: 67.1 %Edmonson County67.1McLean County: 66.7 %McLean County66.7Scott County: 66.3 %Scott County66.3Boone County: 65.1 %Boone County65.1Livingston County: 64.2 %Livingston County64.2Washington County: 64 %Washington County64Greenup County: 61.2 %Greenup County61.2
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1993 (%)Change on 1992
1Floyd County1000 pts
1Whitley County1000 pts
3Madison County98.3+3.2 pts
4Carter County96.6-3.4 pts
4Warren County96.6-3.4 pts
6Trigg County95.3n/a
7Harlan County950 pts
8Marshall County91.1-3.6 pts
9McCracken County88.8+7.1 pts
10Morgan County83.7n/a
11Simpson County82.6-0.9 pts
12Campbell County81.4-7.1 pts
13Graves County80.4-5.9 pts
14Daviess County79.2-2.8 pts
15Bullitt County77.8-10.8 pts
16Christian County76.7n/a
17Bell County76.4-10.8 pts
17Perry County76.4-4.9 pts
19Henderson County75.3-2.8 pts
20Kenton County74.8-8.3 pts
21Lawrence County71.7-5.6 pts
22Hardin County71.6-11 pts
22Pike County71.6-17.2 pts
24Hancock County70.1+4.2 pts
24Jefferson County70.1-9.1 pts
26Boyd County69.9-8.5 pts
26Fayette County69.9-12.3 pts
26Pulaski County69.9-10.6 pts
29Jessamine County68.7-10.6 pts
30Oldham County68.2-14.7 pts
31Edmonson County67.1-1.9 pts
32McLean County66.7-0.9 pts
33Scott County66.3n/a
34Boone County65.1-13.3 pts
35Livingston County64.2+0.2 pts
36Washington County64-10.2 pts
37Greenup County61.2-18.4 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. 18 counties with data in other periods have no value for 1993 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 Kentucky by share of days with good air quality (US EPA AQI), 1993) [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 Kentucky by share of days with good air quality (US EPA AQI), 1993. 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/kentucky-counties?period=1993. 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 Kentucky by share of days with good air quality (US EPA AQI), 1993. 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/kentucky-counties?period=1993.

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 Kentucky by share of days with good air quality (US EPA AQI), 1993 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/kentucky-counties?period=1993 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_kentucky_by_1993,
  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 Kentucky by share of days with good air quality (US EPA AQI), 1993}},
  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/kentucky-counties?period=1993. 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 Kentucky by share of days with good air quality (US EPA AQI), 1993
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/kentucky-counties?period=1993
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/kentucky-counties?period=1993.
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)?

Floyd County, with 100% in 1993, according to EPA.

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

Greenup County, with 61.2% in 1993.

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. 18 counties have no value for 1993 and are not ranked.

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

Counties in Kentucky: more rankings