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 1994, at 98.4%. Christian County had the lowest, at 47.7%. The median was 73.2%. Source: EPA.

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Highest98.4Warren County
Lowest47.7Christian County
Median73.237 counties

Map of counties, 1994

Bell County: 83 %Boone County: 59.4 %Boyd County: 72.3 %Bullitt County: 81.2 %Campbell County: 77.7 %Carter County: 89.3 %Christian County: 47.7 %Daviess County: 75.6 %Edmonson County: 67.1 %Fayette County: 73.2 %Floyd County: 96.2 %Graves County: 79.3 %Greenup County: 61.7 %Hancock County: 59.2 %Hardin County: 63.5 %Harlan County: 85.5 %Henderson County: 73.2 %Jefferson County: 55.3 %Jessamine County: 69.7 %Kenton County: 69.3 %Lawrence County: 77.1 %Livingston County: 60.8 %McCracken County: 79.2 %McLean County: 56.5 %Madison County: 98.2 %Marshall County: 96.5 %Morgan County: 68.6 %Oldham County: 57.8 %Perry County: 77.1 %Pike County: 78.6 %Pulaski County: 71.2 %Scott County: 51.9 %Simpson County: 77.5 %Trigg County: 67.3 %Warren County: 98.4 %Washington County: 65.3 %Whitley County: 96.5 %
  • Under 59
  • 59 to 67
  • 67 to 73
  • 73 to 78
  • 78 to 86
  • 86 and over
  • No data
%, 1994. 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, 1994

Warren County: 98.4 %Warren County98.4Madison County: 98.2 %Madison County98.2Marshall County: 96.5 %Marshall County96.5Whitley County: 96.5 %Whitley County96.5Floyd County: 96.2 %Floyd County96.2Carter County: 89.3 %Carter County89.3Harlan County: 85.5 %Harlan County85.5Bell County: 83 %Bell County83Bullitt County: 81.2 %Bullitt County81.2Graves County: 79.3 %Graves County79.3McCracken County: 79.2 %McCracken County79.2Pike County: 78.6 %Pike County78.6Campbell County: 77.7 %Campbell County77.7Simpson County: 77.5 %Simpson County77.5Lawrence County: 77.1 %Lawrence County77.1Perry County: 77.1 %Perry County77.1Daviess County: 75.6 %Daviess County75.6Fayette County: 73.2 %Fayette County73.2Henderson County: 73.2 %Henderson County73.2Boyd County: 72.3 %Boyd County72.3Pulaski County: 71.2 %Pulaski County71.2Jessamine County: 69.7 %Jessamine County69.7Kenton County: 69.3 %Kenton County69.3Morgan County: 68.6 %Morgan County68.6Trigg County: 67.3 %Trigg County67.3Edmonson County: 67.1 %Edmonson County67.1Washington County: 65.3 %Washington County65.3Hardin County: 63.5 %Hardin County63.5Greenup County: 61.7 %Greenup County61.7Livingston County: 60.8 %Livingston County60.8Boone County: 59.4 %Boone County59.4Hancock County: 59.2 %Hancock County59.2Oldham County: 57.8 %Oldham County57.8McLean County: 56.5 %McLean County56.5Jefferson County: 55.3 %Jefferson County55.3Scott County: 51.9 %Scott County51.9Christian County: 47.7 %Christian County47.7Warren County: 98.4 %Warren County98.4Madison County: 98.2 %Madison County98.2Marshall County: 96.5 %Marshall County96.5Whitley County: 96.5 %Whitley County96.5Floyd County: 96.2 %Floyd County96.2Carter County: 89.3 %Carter County89.3Harlan County: 85.5 %Harlan County85.5Bell County: 83 %Bell County83Bullitt County: 81.2 %Bullitt County81.2Graves County: 79.3 %Graves County79.3McCracken County: 79.2 %McCracken County79.2Pike County: 78.6 %Pike County78.6Campbell County: 77.7 %Campbell County77.7Simpson County: 77.5 %Simpson County77.5Lawrence County: 77.1 %Lawrence County77.1Perry County: 77.1 %Perry County77.1Daviess County: 75.6 %Daviess County75.6Fayette County: 73.2 %Fayette County73.2Henderson County: 73.2 %Henderson County73.2Boyd County: 72.3 %Boyd County72.3Pulaski County: 71.2 %Pulaski County71.2Jessamine County: 69.7 %Jessamine County69.7Kenton County: 69.3 %Kenton County69.3Morgan County: 68.6 %Morgan County68.6Trigg County: 67.3 %Trigg County67.3Edmonson County: 67.1 %Edmonson County67.1Washington County: 65.3 %Washington County65.3Hardin County: 63.5 %Hardin County63.5Greenup County: 61.7 %Greenup County61.7Livingston County: 60.8 %Livingston County60.8Boone County: 59.4 %Boone County59.4Hancock County: 59.2 %Hancock County59.2Oldham County: 57.8 %Oldham County57.8McLean County: 56.5 %McLean County56.5Jefferson County: 55.3 %Jefferson County55.3Scott County: 51.9 %Scott County51.9Christian County: 47.7 %Christian County47.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1994 (%)Change on 1993
1Warren County98.4+1.8 pts
2Madison County98.2-0.1 pts
3Marshall County96.5+5.4 pts
3Whitley County96.5-3.5 pts
5Floyd County96.2-3.8 pts
6Carter County89.3-7.3 pts
7Harlan County85.5-9.5 pts
8Bell County83+6.6 pts
9Bullitt County81.2+3.4 pts
10Graves County79.3-1.1 pts
11McCracken County79.2-9.6 pts
12Pike County78.6+7 pts
13Campbell County77.7-3.7 pts
14Simpson County77.5-5.1 pts
15Lawrence County77.1+5.4 pts
15Perry County77.1+0.7 pts
17Daviess County75.6-3.6 pts
18Fayette County73.2+3.3 pts
18Henderson County73.2-2.1 pts
20Boyd County72.3+2.4 pts
21Pulaski County71.2+1.3 pts
22Jessamine County69.7+1 pts
23Kenton County69.3-5.5 pts
24Morgan County68.6-15.1 pts
25Trigg County67.3-28 pts
26Edmonson County67.10 pts
27Washington County65.3+1.3 pts
28Hardin County63.5-8.1 pts
29Greenup County61.7+0.5 pts
30Livingston County60.8-3.4 pts
31Boone County59.4-5.7 pts
32Hancock County59.2-10.9 pts
33Oldham County57.8-10.4 pts
34McLean County56.5-10.2 pts
35Jefferson County55.3-14.8 pts
36Scott County51.9-14.4 pts
37Christian County47.7-29 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 1994 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), 1994) [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), 1994. 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=1994. 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), 1994. 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=1994.

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), 1994 [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=1994 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_kentucky_by_1994,
  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), 1994}},
  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=1994. 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), 1994
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=1994
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/kentucky-counties?period=1994.
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 98.4% in 1994, according to EPA.

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

Christian County, with 47.7% in 1994.

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 1994 and are not ranked.

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

Counties in Kentucky: more rankings