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)

Warren County had the highest share of days with good air quality (US EPA AQI) of 37 counties in 1995, at 100%. Hancock County had the lowest, at 49.3%. The median was 68.2%. Source: EPA.

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Highest100Warren County
Lowest49.3Hancock County
Median68.237 counties

Map of counties, 1995

Bell County: 76.4 %Boone County: 68.2 %Boyd County: 71.2 %Bullitt County: 74.7 %Campbell County: 78.8 %Carter County: 91.5 %Christian County: 57.1 %Daviess County: 72.6 %Edmonson County: 59.3 %Fayette County: 71.8 %Floyd County: 96.6 %Graves County: 74.3 %Greenup County: 61.1 %Hancock County: 49.3 %Hardin County: 52.6 %Harlan County: 91.5 %Henderson County: 69.3 %Jefferson County: 63 %Jessamine County: 63.4 %Kenton County: 60 %Lawrence County: 71.6 %Livingston County: 57.1 %McCracken County: 80.3 %McLean County: 53.4 %Madison County: 95 %Marshall County: 95.1 %Morgan County: 54.8 %Oldham County: 60 %Perry County: 76.1 %Pike County: 60.9 %Pulaski County: 61.8 %Scott County: 57.3 %Simpson County: 66.7 %Trigg County: 59.5 %Warren County: 100 %Washington County: 53.2 %Whitley County: 93 %
  • Under 57
  • 57 to 61
  • 61 to 68
  • 68 to 74
  • 74 to 92
  • 92 and over
  • No data
%, 1995. 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, 1995

Warren County: 100 %Warren County100Floyd County: 96.6 %Floyd County96.6Marshall County: 95.1 %Marshall County95.1Madison County: 95 %Madison County95Whitley County: 93 %Whitley County93Carter County: 91.5 %Carter County91.5Harlan County: 91.5 %Harlan County91.5McCracken County: 80.3 %McCracken County80.3Campbell County: 78.8 %Campbell County78.8Bell County: 76.4 %Bell County76.4Perry County: 76.1 %Perry County76.1Bullitt County: 74.7 %Bullitt County74.7Graves County: 74.3 %Graves County74.3Daviess County: 72.6 %Daviess County72.6Fayette County: 71.8 %Fayette County71.8Lawrence County: 71.6 %Lawrence County71.6Boyd County: 71.2 %Boyd County71.2Henderson County: 69.3 %Henderson County69.3Boone County: 68.2 %Boone County68.2Simpson County: 66.7 %Simpson County66.7Jessamine County: 63.4 %Jessamine County63.4Jefferson County: 63 %Jefferson County63Pulaski County: 61.8 %Pulaski County61.8Greenup County: 61.1 %Greenup County61.1Pike County: 60.9 %Pike County60.9Kenton County: 60 %Kenton County60Oldham County: 60 %Oldham County60Trigg County: 59.5 %Trigg County59.5Edmonson County: 59.3 %Edmonson County59.3Scott County: 57.3 %Scott County57.3Christian County: 57.1 %Christian County57.1Livingston County: 57.1 %Livingston County57.1Morgan County: 54.8 %Morgan County54.8McLean County: 53.4 %McLean County53.4Washington County: 53.2 %Washington County53.2Hardin County: 52.6 %Hardin County52.6Hancock County: 49.3 %Hancock County49.3Warren County: 100 %Warren County100Floyd County: 96.6 %Floyd County96.6Marshall County: 95.1 %Marshall County95.1Madison County: 95 %Madison County95Whitley County: 93 %Whitley County93Carter County: 91.5 %Carter County91.5Harlan County: 91.5 %Harlan County91.5McCracken County: 80.3 %McCracken County80.3Campbell County: 78.8 %Campbell County78.8Bell County: 76.4 %Bell County76.4Perry County: 76.1 %Perry County76.1Bullitt County: 74.7 %Bullitt County74.7Graves County: 74.3 %Graves County74.3Daviess County: 72.6 %Daviess County72.6Fayette County: 71.8 %Fayette County71.8Lawrence County: 71.6 %Lawrence County71.6Boyd County: 71.2 %Boyd County71.2Henderson County: 69.3 %Henderson County69.3Boone County: 68.2 %Boone County68.2Simpson County: 66.7 %Simpson County66.7Jessamine County: 63.4 %Jessamine County63.4Jefferson County: 63 %Jefferson County63Pulaski County: 61.8 %Pulaski County61.8Greenup County: 61.1 %Greenup County61.1Pike County: 60.9 %Pike County60.9Kenton County: 60 %Kenton County60Oldham County: 60 %Oldham County60Trigg County: 59.5 %Trigg County59.5Edmonson County: 59.3 %Edmonson County59.3Scott County: 57.3 %Scott County57.3Christian County: 57.1 %Christian County57.1Livingston County: 57.1 %Livingston County57.1Morgan County: 54.8 %Morgan County54.8McLean County: 53.4 %McLean County53.4Washington County: 53.2 %Washington County53.2Hardin County: 52.6 %Hardin County52.6Hancock County: 49.3 %Hancock County49.3
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1995 (%)Change on 1994
1Warren County100+1.6 pts
2Floyd County96.6+0.4 pts
3Marshall County95.1-1.4 pts
4Madison County95-3.2 pts
5Whitley County93-3.5 pts
6Carter County91.5+2.2 pts
6Harlan County91.5+6 pts
8McCracken County80.3+1.1 pts
9Campbell County78.8+1.1 pts
10Bell County76.4-6.6 pts
11Perry County76.1-1 pts
12Bullitt County74.7-6.5 pts
13Graves County74.3-5 pts
14Daviess County72.6-3 pts
15Fayette County71.8-1.4 pts
16Lawrence County71.6-5.5 pts
17Boyd County71.2-1.1 pts
18Henderson County69.3-3.9 pts
19Boone County68.2+8.8 pts
20Simpson County66.7-10.8 pts
21Jessamine County63.4-6.3 pts
22Jefferson County63+7.7 pts
23Pulaski County61.8-9.4 pts
24Greenup County61.1-0.6 pts
25Pike County60.9-17.7 pts
26Kenton County60-9.3 pts
26Oldham County60+2.2 pts
28Trigg County59.5-7.8 pts
29Edmonson County59.3-7.8 pts
30Scott County57.3+5.4 pts
31Christian County57.1+9.4 pts
31Livingston County57.1-3.7 pts
33Morgan County54.8-13.8 pts
34McLean County53.4-3.1 pts
35Washington County53.2-12.1 pts
36Hardin County52.6-10.9 pts
37Hancock County49.3-9.9 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 1995 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), 1995) [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), 1995. 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=1995. 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), 1995. 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=1995.

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), 1995 [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=1995 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_kentucky_by_1995,
  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), 1995}},
  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=1995. 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), 1995
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=1995
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/kentucky-counties?period=1995.
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)?

Warren County, with 100% in 1995, according to EPA.

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

Hancock County, with 49.3% in 1995.

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 1995 and are not ranked.

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

Counties in Kentucky: more rankings