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 36 counties in 1996, at 100%. Washington County had the lowest, at 59.9%. The median was 75.9%. Source: EPA.

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Highest100Warren County
Lowest59.9Washington County
Median75.936 counties

Map of counties, 1996

Bell County: 86.9 %Boone County: 73.4 %Boyd County: 77 %Bullitt County: 78.6 %Campbell County: 80.9 %Christian County: 70.3 %Daviess County: 79.5 %Edmonson County: 62.6 %Fayette County: 80.9 %Floyd County: 98.2 %Graves County: 76.1 %Greenup County: 75.8 %Hancock County: 65.5 %Hardin County: 66 %Harlan County: 98.3 %Henderson County: 72.1 %Jefferson County: 71.9 %Jessamine County: 73.8 %Kenton County: 74 %Lawrence County: 88.6 %Livingston County: 68.5 %McCracken County: 85.2 %McLean County: 63.1 %Madison County: 98.3 %Marshall County: 98.3 %Morgan County: 68.5 %Oldham County: 69.3 %Perry County: 89 %Pike County: 76.5 %Pulaski County: 81.9 %Scott County: 69 %Simpson County: 74.1 %Trigg County: 68 %Warren County: 100 %Washington County: 59.9 %Whitley County: 100 %
  • Under 68
  • 68 to 72
  • 72 to 76
  • 76 to 81
  • 81 to 91
  • 91 and over
  • No data
%, 1996. 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, 1996

Warren County: 100 %Warren County100Whitley County: 100 %Whitley County100Harlan County: 98.3 %Harlan County98.3Madison County: 98.3 %Madison County98.3Marshall County: 98.3 %Marshall County98.3Floyd County: 98.2 %Floyd County98.2Perry County: 89 %Perry County89Lawrence County: 88.6 %Lawrence County88.6Bell County: 86.9 %Bell County86.9McCracken County: 85.2 %McCracken County85.2Pulaski County: 81.9 %Pulaski County81.9Campbell County: 80.9 %Campbell County80.9Fayette County: 80.9 %Fayette County80.9Daviess County: 79.5 %Daviess County79.5Bullitt County: 78.6 %Bullitt County78.6Boyd County: 77 %Boyd County77Pike County: 76.5 %Pike County76.5Graves County: 76.1 %Graves County76.1Greenup County: 75.8 %Greenup County75.8Simpson County: 74.1 %Simpson County74.1Kenton County: 74 %Kenton County74Jessamine County: 73.8 %Jessamine County73.8Boone County: 73.4 %Boone County73.4Henderson County: 72.1 %Henderson County72.1Jefferson County: 71.9 %Jefferson County71.9Christian County: 70.3 %Christian County70.3Oldham County: 69.3 %Oldham County69.3Scott County: 69 %Scott County69Livingston County: 68.5 %Livingston County68.5Morgan County: 68.5 %Morgan County68.5Trigg County: 68 %Trigg County68Hardin County: 66 %Hardin County66Hancock County: 65.5 %Hancock County65.5McLean County: 63.1 %McLean County63.1Edmonson County: 62.6 %Edmonson County62.6Washington County: 59.9 %Washington County59.9Warren County: 100 %Warren County100Whitley County: 100 %Whitley County100Harlan County: 98.3 %Harlan County98.3Madison County: 98.3 %Madison County98.3Marshall County: 98.3 %Marshall County98.3Floyd County: 98.2 %Floyd County98.2Perry County: 89 %Perry County89Lawrence County: 88.6 %Lawrence County88.6Bell County: 86.9 %Bell County86.9McCracken County: 85.2 %McCracken County85.2Pulaski County: 81.9 %Pulaski County81.9Campbell County: 80.9 %Campbell County80.9Fayette County: 80.9 %Fayette County80.9Daviess County: 79.5 %Daviess County79.5Bullitt County: 78.6 %Bullitt County78.6Boyd County: 77 %Boyd County77Pike County: 76.5 %Pike County76.5Graves County: 76.1 %Graves County76.1Greenup County: 75.8 %Greenup County75.8Simpson County: 74.1 %Simpson County74.1Kenton County: 74 %Kenton County74Jessamine County: 73.8 %Jessamine County73.8Boone County: 73.4 %Boone County73.4Henderson County: 72.1 %Henderson County72.1Jefferson County: 71.9 %Jefferson County71.9Christian County: 70.3 %Christian County70.3Oldham County: 69.3 %Oldham County69.3Scott County: 69 %Scott County69Livingston County: 68.5 %Livingston County68.5Morgan County: 68.5 %Morgan County68.5Trigg County: 68 %Trigg County68Hardin County: 66 %Hardin County66Hancock County: 65.5 %Hancock County65.5McLean County: 63.1 %McLean County63.1Edmonson County: 62.6 %Edmonson County62.6Washington County: 59.9 %Washington County59.9
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1996 (%)Change on 1995
1Warren County1000 pts
1Whitley County100+7 pts
3Harlan County98.3+6.8 pts
3Madison County98.3+3.3 pts
3Marshall County98.3+3.2 pts
6Floyd County98.2+1.6 pts
7Perry County89+12.9 pts
8Lawrence County88.6+17 pts
9Bell County86.9+10.5 pts
10McCracken County85.2+4.9 pts
11Pulaski County81.9+20.1 pts
12Campbell County80.9+2.1 pts
12Fayette County80.9+9.1 pts
14Daviess County79.5+6.9 pts
15Bullitt County78.6+3.9 pts
16Boyd County77+5.8 pts
17Pike County76.5+15.6 pts
18Graves County76.1+1.8 pts
19Greenup County75.8+14.7 pts
20Simpson County74.1+7.4 pts
21Kenton County74+14 pts
22Jessamine County73.8+10.4 pts
23Boone County73.4+5.2 pts
24Henderson County72.1+2.8 pts
25Jefferson County71.9+8.9 pts
26Christian County70.3+13.2 pts
27Oldham County69.3+9.3 pts
28Scott County69+11.7 pts
29Livingston County68.5+11.4 pts
29Morgan County68.5+13.7 pts
31Trigg County68+8.5 pts
32Hardin County66+13.4 pts
33Hancock County65.5+16.2 pts
34McLean County63.1+9.7 pts
35Edmonson County62.6+3.3 pts
36Washington County59.9+6.7 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. 19 counties with data in other periods have no value for 1996 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), 1996) [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), 1996. 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=1996. 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), 1996. 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=1996.

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), 1996 [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=1996 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_kentucky_by_1996,
  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), 1996}},
  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=1996. 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), 1996
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=1996
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/kentucky-counties?period=1996.
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 1996, according to EPA.

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

Washington County, with 59.9% in 1996.

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. 19 counties have no value for 1996 and are not ranked.

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

Counties in Kentucky: more rankings