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

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

Madison County had the highest share of days with good air quality (US EPA AQI) of 32 counties in 1996, at 100%. Jefferson County had the lowest, at 33.8%. The median was 67.8%. Source: EPA.

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Highest100Madison County
Lowest33.8Jefferson County
Median67.832 counties

Map of counties, 1996

Anderson County: 45.5 %Benton County: 95.9 %Blount County: 51.1 %Bradley County: 98.9 %Claiborne County: 81.9 %Coffee County: 96 %Davidson County: 65.8 %DeKalb County: 69.4 %Dickson County: 98.6 %Giles County: 46.7 %Hamilton County: 66.4 %Haywood County: 48.6 %Henry County: 95.1 %Humphreys County: 66.2 %Jefferson County: 33.8 %Knox County: 65.6 %Loudon County: 65 %McMinn County: 96.6 %Madison County: 100 %Maury County: 98.4 %Montgomery County: 97.6 %Putnam County: 97 %Roane County: 97 %Rutherford County: 56.4 %Sevier County: 43 %Shelby County: 60.9 %Sullivan County: 69.1 %Sumner County: 47.7 %Union County: 89.4 %Washington County: 100 %Williamson County: 48.4 %Wilson County: 45.2 %
  • Under 48
  • 48 to 62
  • 62 to 68
  • 68 to 96
  • 96 to 98
  • 98 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

Madison County: 100 %Madison County100Washington County: 100 %Washington County100Bradley County: 98.9 %Bradley County98.9Dickson County: 98.6 %Dickson County98.6Maury County: 98.4 %Maury County98.4Montgomery County: 97.6 %Montgomery County97.6Putnam County: 97 %Putnam County97Roane County: 97 %Roane County97McMinn County: 96.6 %McMinn County96.6Coffee County: 96 %Coffee County96Benton County: 95.9 %Benton County95.9Henry County: 95.1 %Henry County95.1Union County: 89.4 %Union County89.4Claiborne County: 81.9 %Claiborne County81.9DeKalb County: 69.4 %DeKalb County69.4Sullivan County: 69.1 %Sullivan County69.1Hamilton County: 66.4 %Hamilton County66.4Humphreys County: 66.2 %Humphreys County66.2Davidson County: 65.8 %Davidson County65.8Knox County: 65.6 %Knox County65.6Loudon County: 65 %Loudon County65Shelby County: 60.9 %Shelby County60.9Rutherford County: 56.4 %Rutherford County56.4Blount County: 51.1 %Blount County51.1Haywood County: 48.6 %Haywood County48.6Williamson County: 48.4 %Williamson County48.4Sumner County: 47.7 %Sumner County47.7Giles County: 46.7 %Giles County46.7Anderson County: 45.5 %Anderson County45.5Wilson County: 45.2 %Wilson County45.2Sevier County: 43 %Sevier County43Jefferson County: 33.8 %Jefferson County33.8Madison County: 100 %Madison County100Washington County: 100 %Washington County100Bradley County: 98.9 %Bradley County98.9Dickson County: 98.6 %Dickson County98.6Maury County: 98.4 %Maury County98.4Montgomery County: 97.6 %Montgomery County97.6Putnam County: 97 %Putnam County97Roane County: 97 %Roane County97McMinn County: 96.6 %McMinn County96.6Coffee County: 96 %Coffee County96Benton County: 95.9 %Benton County95.9Henry County: 95.1 %Henry County95.1Union County: 89.4 %Union County89.4Claiborne County: 81.9 %Claiborne County81.9DeKalb County: 69.4 %DeKalb County69.4Sullivan County: 69.1 %Sullivan County69.1Hamilton County: 66.4 %Hamilton County66.4Humphreys County: 66.2 %Humphreys County66.2Davidson County: 65.8 %Davidson County65.8Knox County: 65.6 %Knox County65.6Loudon County: 65 %Loudon County65Shelby County: 60.9 %Shelby County60.9Rutherford County: 56.4 %Rutherford County56.4Blount County: 51.1 %Blount County51.1Haywood County: 48.6 %Haywood County48.6Williamson County: 48.4 %Williamson County48.4Sumner County: 47.7 %Sumner County47.7Giles County: 46.7 %Giles County46.7Anderson County: 45.5 %Anderson County45.5Wilson County: 45.2 %Wilson County45.2Sevier County: 43 %Sevier County43Jefferson County: 33.8 %Jefferson County33.8
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1996 (%)Change on 1995
1Madison County100+12.6 pts
1Washington County100+3.4 pts
3Bradley County98.9+1.1 pts
4Dickson County98.6+37.1 pts
5Maury County98.4+3.1 pts
6Montgomery County97.6-0.7 pts
7Putnam County97+12.9 pts
7Roane County97+1.7 pts
9McMinn County96.6-0.8 pts
10Coffee County96+26.5 pts
11Benton County95.9-4.1 pts
12Henry County95.1+9.6 pts
13Union County89.4+2.7 pts
14Claiborne County81.9+23.8 pts
15DeKalb County69.4+11.1 pts
16Sullivan County69.1+6.9 pts
17Hamilton County66.4-2.1 pts
18Humphreys County66.2n/a
19Davidson County65.8+2.5 pts
20Knox County65.6-6.2 pts
21Loudon County65-35 pts
22Shelby County60.9+3.6 pts
23Rutherford County56.4-21.3 pts
24Blount County51.1+0.1 pts
25Haywood County48.6-5 pts
26Williamson County48.4+0.7 pts
27Sumner County47.7+7 pts
28Giles County46.7-53.3 pts
29Anderson County45.5+4.8 pts
30Wilson County45.2-7.4 pts
31Sevier County43+10.8 pts
32Jefferson County33.8+7.5 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. 10 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 Tennessee 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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=1996 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_tennessee_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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=1996
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/tennessee-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)?

Madison County, with 100% in 1996, according to EPA.

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

Jefferson County, with 33.8% 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. 10 counties have no value for 1996 and are not ranked.

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

Counties in Tennessee: more rankings