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

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

Hancock County had the highest share of days with good air quality (US EPA AQI) of 39 counties in 2014, at 98.9%. Lake County had the lowest, at 18.1%. The median was 60.7%. Source: EPA.

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Highest98.9Hancock County
Lowest18.1Lake County
Median60.739 counties

Map of counties, 2014

Allen County: 31.2 %Bartholomew County: 64.3 %Boone County: 78.1 %Brown County: 94.1 %Carroll County: 83.2 %Clark County: 36.7 %Delaware County: 76.7 %Dubois County: 40.2 %Elkhart County: 22.8 %Floyd County: 25.2 %Greene County: 68 %Hamilton County: 53.4 %Hancock County: 98.9 %Hendricks County: 95.6 %Henry County: 54.5 %Howard County: 38.7 %Huntington County: 95.5 %Jackson County: 81.2 %Johnson County: 96.6 %Knox County: 89.9 %Lake County: 18.1 %LaPorte County: 64 %Madison County: 45.1 %Marion County: 23.3 %Monroe County: 60.7 %Montgomery County: 35.6 %Morgan County: 81.2 %Perry County: 74.9 %Porter County: 36.1 %Posey County: 81.2 %St. Joseph County: 43.6 %Shelby County: 86.3 %Spencer County: 46.3 %Tippecanoe County: 56.3 %Vanderburgh County: 31.8 %Vigo County: 38.4 %Wabash County: 90.5 %Warrick County: 76.5 %Whitley County: 48.6 %
  • Under 36
  • 36 to 45
  • 45 to 61
  • 61 to 77
  • 77 to 89
  • 89 and over
  • No data
%, 2014. 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, 2014

Hancock County: 98.9 %Hancock County98.9Johnson County: 96.6 %Johnson County96.6Hendricks County: 95.6 %Hendricks County95.6Huntington County: 95.5 %Huntington County95.5Brown County: 94.1 %Brown County94.1Wabash County: 90.5 %Wabash County90.5Knox County: 89.9 %Knox County89.9Shelby County: 86.3 %Shelby County86.3Carroll County: 83.2 %Carroll County83.2Jackson County: 81.2 %Jackson County81.2Morgan County: 81.2 %Morgan County81.2Posey County: 81.2 %Posey County81.2Boone County: 78.1 %Boone County78.1Delaware County: 76.7 %Delaware County76.7Warrick County: 76.5 %Warrick County76.5Perry County: 74.9 %Perry County74.9Greene County: 68 %Greene County68Bartholomew County: 64.3 %Bartholomew County64.3LaPorte County: 64 %LaPorte County64Monroe County: 60.7 %Monroe County60.7Tippecanoe County: 56.3 %Tippecanoe County56.3Henry County: 54.5 %Henry County54.5Hamilton County: 53.4 %Hamilton County53.4Whitley County: 48.6 %Whitley County48.6Spencer County: 46.3 %Spencer County46.3Madison County: 45.1 %Madison County45.1St. Joseph County: 43.6 %St. Joseph County43.6Dubois County: 40.2 %Dubois County40.2Howard County: 38.7 %Howard County38.7Vigo County: 38.4 %Vigo County38.4Clark County: 36.7 %Clark County36.7Porter County: 36.1 %Porter County36.1Montgomery County: 35.6 %Montgomery County35.6Vanderburgh County: 31.8 %Vanderburgh County31.8Allen County: 31.2 %Allen County31.2Floyd County: 25.2 %Floyd County25.2Marion County: 23.3 %Marion County23.3Elkhart County: 22.8 %Elkhart County22.8Lake County: 18.1 %Lake County18.1Hancock County: 98.9 %Hancock County98.9Johnson County: 96.6 %Johnson County96.6Hendricks County: 95.6 %Hendricks County95.6Huntington County: 95.5 %Huntington County95.5Brown County: 94.1 %Brown County94.1Wabash County: 90.5 %Wabash County90.5Knox County: 89.9 %Knox County89.9Shelby County: 86.3 %Shelby County86.3Carroll County: 83.2 %Carroll County83.2Jackson County: 81.2 %Jackson County81.2Morgan County: 81.2 %Morgan County81.2Posey County: 81.2 %Posey County81.2Boone County: 78.1 %Boone County78.1Delaware County: 76.7 %Delaware County76.7Warrick County: 76.5 %Warrick County76.5Perry County: 74.9 %Perry County74.9Greene County: 68 %Greene County68Bartholomew County: 64.3 %Bartholomew County64.3LaPorte County: 64 %LaPorte County64Monroe County: 60.7 %Monroe County60.7Tippecanoe County: 56.3 %Tippecanoe County56.3Henry County: 54.5 %Henry County54.5Hamilton County: 53.4 %Hamilton County53.4Whitley County: 48.6 %Whitley County48.6Spencer County: 46.3 %Spencer County46.3Madison County: 45.1 %Madison County45.1St. Joseph County: 43.6 %St. Joseph County43.6Dubois County: 40.2 %Dubois County40.2Howard County: 38.7 %Howard County38.7Vigo County: 38.4 %Vigo County38.4Clark County: 36.7 %Clark County36.7Porter County: 36.1 %Porter County36.1Montgomery County: 35.6 %Montgomery County35.6Vanderburgh County: 31.8 %Vanderburgh County31.8Allen County: 31.2 %Allen County31.2Floyd County: 25.2 %Floyd County25.2Marion County: 23.3 %Marion County23.3Elkhart County: 22.8 %Elkhart County22.8Lake County: 18.1 %Lake County18.1
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Hancock County98.9+8.3 pts
2Johnson County96.6+8.3 pts
3Hendricks County95.6+1.7 pts
4Huntington County95.5-1.2 pts
5Brown County94.1n/a
6Wabash County90.5+3 pts
7Knox County89.9-1 pts
8Shelby County86.3+5.4 pts
9Carroll County83.2+4.2 pts
10Jackson County81.2-5.1 pts
10Morgan County81.2-0.2 pts
10Posey County81.2-5.7 pts
13Boone County78.10 pts
14Delaware County76.7+3.9 pts
15Warrick County76.5-3.3 pts
16Perry County74.9-7.6 pts
17Greene County68+5.2 pts
18Bartholomew County64.3-17.5 pts
19LaPorte County64+3.7 pts
20Monroe County60.7+1.2 pts
21Tippecanoe County56.3+30.4 pts
22Henry County54.5+2.8 pts
23Hamilton County53.4-37.8 pts
24Whitley County48.6+12.5 pts
25Spencer County46.3+2.2 pts
26Madison County45.1+2.1 pts
27St. Joseph County43.6+12.6 pts
28Dubois County40.2-0.6 pts
29Howard County38.7n/a
30Vigo County38.4-2.8 pts
31Clark County36.7+0.3 pts
32Porter County36.1-11 pts
33Montgomery County35.6n/a
34Vanderburgh County31.8-2.7 pts
35Allen County31.2-15.4 pts
36Floyd County25.2-23.8 pts
37Marion County23.3+7.1 pts
38Elkhart County22.8-14.6 pts
39Lake County18.1-6 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. 14 counties with data in other periods have no value for 2014 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 Indiana by share of days with good air quality (US EPA AQI), 2014) [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 Indiana by share of days with good air quality (US EPA AQI), 2014. 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/indiana-counties?period=2014. 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 Indiana by share of days with good air quality (US EPA AQI), 2014. 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/indiana-counties?period=2014.

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 Indiana by share of days with good air quality (US EPA AQI), 2014 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/indiana-counties?period=2014 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_indiana_by_2014,
  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 Indiana by share of days with good air quality (US EPA AQI), 2014}},
  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/indiana-counties?period=2014. 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 Indiana by share of days with good air quality (US EPA AQI), 2014
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/indiana-counties?period=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/indiana-counties?period=2014.
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)?

Hancock County, with 98.9% in 2014, according to EPA.

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

Lake County, with 18.1% in 2014.

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. 14 counties have no value for 2014 and are not ranked.

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

Counties in Indiana: more rankings