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

Greene County had the highest share of days with good air quality (US EPA AQI) of 30 counties in 2001, at 100%. Knox County had the lowest, at 13.7%. The median was 52.6%. Source: EPA.

Highest100Greene County

Lowest13.7Knox County

Median52.630 counties

Map of counties, 2001

Under 33
33 to 47
47 to 53
53 to 57
57 to 72
72 and over
No data

%, 2001. 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, 2001

%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2001 (%)	Change on 2000
1	Greene County	100	+10.9 pts
2	Bradley County	97.8	+1.8 pts
3	Union County	82.7	-0.3 pts
4	DeKalb County	75.6	+4.7 pts
5	McMinn County	74.4	+0.3 pts
6	Claiborne County	72	+3.5 pts
7	Wilson County	61.9	+11.9 pts
8	Haywood County	61.2	+11.7 pts
9	Rutherford County	61.1	+4.1 pts
10	Anderson County	58.3	+5.1 pts
11	Jefferson County	56	-2.7 pts
12	Hamblen County	55.9	n/a
12	Williamson County	55.9	+8.3 pts
14	Dyer County	53.2	+30.6 pts
15	Sullivan County	52.9	-0.4 pts
16	Lawrence County	52.2	+13.1 pts
17	Montgomery County	52	+8 pts
18	Meigs County	50.4	+7.6 pts
19	Obion County	49.8	n/a
20	Blount County	47.5	+10.8 pts
21	Putnam County	46.6	+15.2 pts
22	Sumner County	42.5	+10.2 pts
23	Hamilton County	39.9	+4.6 pts
24	Sevier County	38.6	+0.5 pts
25	Maury County	33.3	+15.1 pts
26	Madison County	32	+7 pts
27	Roane County	26.4	-19.1 pts
28	Shelby County	20.5	+6.6 pts
29	Davidson County	16.7	+5.5 pts
30	Knox County	13.7	-0.2 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. 12 counties with data in other periods have no value for 2001 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), 2001) [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), 2001. 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=2001. 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), 2001. 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=2001.

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), 2001 [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=2001 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_tennessee_by_2001,
  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), 2001}},
  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=2001. 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), 2001
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=2001
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/tennessee-counties?period=2001.
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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rank_places {"indicator":"aqi_good_days_share","level":"province","within":"Tennessee","limit":10}
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Questions

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

Greene County, with 100% in 2001, according to EPA.

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

Knox County, with 13.7% in 2001.

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. 12 counties have no value for 2001 and are not ranked.