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)

Benton County had the highest share of days with good air quality (US EPA AQI) of 33 counties in 1995, at 100%. Jefferson County had the lowest, at 26.3%. The median was 69.5%. Source: EPA.

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Highest100Benton County
Lowest26.3Jefferson County
Median69.533 counties

Map of counties, 1995

Anderson County: 40.7 %Benton County: 100 %Blount County: 51 %Bradley County: 97.8 %Claiborne County: 58.1 %Coffee County: 69.5 %Davidson County: 63.3 %DeKalb County: 58.3 %Dickson County: 61.5 %Dyer County: 64 %Giles County: 100 %Hamblen County: 100 %Hamilton County: 68.5 %Haywood County: 53.6 %Henry County: 85.5 %Jefferson County: 26.3 %Knox County: 71.8 %Loudon County: 100 %McMinn County: 97.4 %Madison County: 87.4 %Maury County: 95.3 %Montgomery County: 98.3 %Putnam County: 84.1 %Roane County: 95.3 %Rutherford County: 77.7 %Sevier County: 32.2 %Shelby County: 57.3 %Sullivan County: 62.2 %Sumner County: 40.7 %Union County: 86.7 %Washington County: 96.6 %Williamson County: 47.7 %Wilson County: 52.6 %
  • Under 52
  • 52 to 60
  • 60 to 70
  • 70 to 87
  • 87 to 98
  • 98 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

Benton County: 100 %Benton County100Giles County: 100 %Giles County100Hamblen County: 100 %Hamblen County100Loudon County: 100 %Loudon County100Montgomery County: 98.3 %Montgomery County98.3Bradley County: 97.8 %Bradley County97.8McMinn County: 97.4 %McMinn County97.4Washington County: 96.6 %Washington County96.6Maury County: 95.3 %Maury County95.3Roane County: 95.3 %Roane County95.3Madison County: 87.4 %Madison County87.4Union County: 86.7 %Union County86.7Henry County: 85.5 %Henry County85.5Putnam County: 84.1 %Putnam County84.1Rutherford County: 77.7 %Rutherford County77.7Knox County: 71.8 %Knox County71.8Coffee County: 69.5 %Coffee County69.5Hamilton County: 68.5 %Hamilton County68.5Dyer County: 64 %Dyer County64Davidson County: 63.3 %Davidson County63.3Sullivan County: 62.2 %Sullivan County62.2Dickson County: 61.5 %Dickson County61.5DeKalb County: 58.3 %DeKalb County58.3Claiborne County: 58.1 %Claiborne County58.1Shelby County: 57.3 %Shelby County57.3Haywood County: 53.6 %Haywood County53.6Wilson County: 52.6 %Wilson County52.6Blount County: 51 %Blount County51Williamson County: 47.7 %Williamson County47.7Anderson County: 40.7 %Anderson County40.7Sumner County: 40.7 %Sumner County40.7Sevier County: 32.2 %Sevier County32.2Jefferson County: 26.3 %Jefferson County26.3Benton County: 100 %Benton County100Giles County: 100 %Giles County100Hamblen County: 100 %Hamblen County100Loudon County: 100 %Loudon County100Montgomery County: 98.3 %Montgomery County98.3Bradley County: 97.8 %Bradley County97.8McMinn County: 97.4 %McMinn County97.4Washington County: 96.6 %Washington County96.6Maury County: 95.3 %Maury County95.3Roane County: 95.3 %Roane County95.3Madison County: 87.4 %Madison County87.4Union County: 86.7 %Union County86.7Henry County: 85.5 %Henry County85.5Putnam County: 84.1 %Putnam County84.1Rutherford County: 77.7 %Rutherford County77.7Knox County: 71.8 %Knox County71.8Coffee County: 69.5 %Coffee County69.5Hamilton County: 68.5 %Hamilton County68.5Dyer County: 64 %Dyer County64Davidson County: 63.3 %Davidson County63.3Sullivan County: 62.2 %Sullivan County62.2Dickson County: 61.5 %Dickson County61.5DeKalb County: 58.3 %DeKalb County58.3Claiborne County: 58.1 %Claiborne County58.1Shelby County: 57.3 %Shelby County57.3Haywood County: 53.6 %Haywood County53.6Wilson County: 52.6 %Wilson County52.6Blount County: 51 %Blount County51Williamson County: 47.7 %Williamson County47.7Anderson County: 40.7 %Anderson County40.7Sumner County: 40.7 %Sumner County40.7Sevier County: 32.2 %Sevier County32.2Jefferson County: 26.3 %Jefferson County26.3
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1995 (%)Change on 1994
1Benton County100n/a
1Giles County1000 pts
1Hamblen County100+29.3 pts
1Loudon County100n/a
5Montgomery County98.3+0.3 pts
6Bradley County97.8+25.5 pts
7McMinn County97.4+1.6 pts
8Washington County96.6-1.5 pts
9Maury County95.3+22.5 pts
9Roane County95.3-0.8 pts
11Madison County87.4+16.2 pts
12Union County86.7-1.6 pts
13Henry County85.5n/a
14Putnam County84.1n/a
15Rutherford County77.7+17.5 pts
16Knox County71.8-1.4 pts
17Coffee County69.5n/a
18Hamilton County68.5-3.3 pts
19Dyer County64n/a
20Davidson County63.3+2.5 pts
21Sullivan County62.2-10.4 pts
22Dickson County61.5+0.9 pts
23DeKalb County58.3-18.4 pts
24Claiborne County58.1-14.1 pts
25Shelby County57.3+3.1 pts
26Haywood County53.6-4.5 pts
27Wilson County52.6-14.2 pts
28Blount County51-6.4 pts
29Williamson County47.7-23.2 pts
30Anderson County40.7-12.2 pts
30Sumner County40.7-6.5 pts
32Sevier County32.2-19.8 pts
33Jefferson County26.3-23.9 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. 9 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 Tennessee 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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=1995 (Accessed: 12 October 2026).

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

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

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

Jefferson County, with 26.3% 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. 9 counties have no value for 1995 and are not ranked.

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

Counties in Tennessee: more rankings