Data / Share of days with good air quality (US EPA AQI) / Sullivan County

Share of days with good air quality (US EPA AQI) in Sullivan County

Share of days with good air quality (US EPA AQI) in Sullivan County was 74.2% in 2020, according to EPA. That is up 11.3 pts from 2019.

202074.2%
Change on 2019+11.3 pts
Series high1001980
Series low59.72018

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Share of days with good air quality (US EPA AQI) in Sullivan County, 1980 to 2020

50607080901001980198219841986201720201980: 100 %1981: 99.7 %1982: 100 %1983: 98.9 %1984: 98.9 %1985: 98.9 %1986: 99.2 %1987: 100 %2017: 62.1 %2018: 59.7 %2019: 62.9 %2020: 74.2 %40608010019801984201720201980: 100 %1981: 99.7 %1982: 100 %1983: 98.9 %1984: 98.9 %1985: 98.9 %1986: 99.2 %1987: 100 %2017: 62.1 %2018: 59.7 %2019: 62.9 %2020: 74.2 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 12 values
Period%
202074.2
201962.9
201859.7
201762.1
1987100
198699.2
198598.9
198498.9
198398.9
1982100
198199.7
1980100

Sullivan County compared with nearby places

Allen County: 63.4 %Bartholomew County: 75.1 %Boone County: 93.8 %Brown County: 95.9 %Carroll County: 96.7 %Clark County: 50.8 %Delaware County: 83 %Dubois County: 63.4 %Elkhart County: 69.4 %Floyd County: 95.6 %Greene County: 86.4 %Hamilton County: 67.5 %Hendricks County: 95.1 %Henry County: 73.7 %Howard County: 72.7 %Knox County: 93.4 %Lake County: 44 %LaPorte County: 79.5 %Madison County: 63.7 %Marion County: 30.1 %Monroe County: 67.2 %Perry County: 96.2 %Porter County: 67.5 %Posey County: 94.6 %St. Joseph County: 56.6 %Shelby County: 94.8 %Spencer County: 65.6 %Sullivan County: 74.2 %Tippecanoe County: 48 %Vanderburgh County: 67.8 %Vigo County: 60.9 %Wabash County: 92.8 %Warrick County: 94.8 %Whitley County: 47.6 %
  • Under 59
  • 59 to 67
  • 67 to 73
  • 73 to 86
  • 86 to 95
  • 95 and over
  • No data
Share of days with good air quality (US EPA AQI), 2020, %. Sullivan County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020) [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, Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/sullivan-county-indiana. 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. Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/sullivan-county-indiana.

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, Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/sullivan-county-indiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2020,
  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: Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020}},
  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/en/good-air-quality-days-share/sullivan-county-indiana. 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: Share of days with good air quality (US EPA AQI), Sullivan County, 1980 to 2020
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/en/good-air-quality-days-share/sullivan-county-indiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/sullivan-county-indiana.
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

What is the share of days with good air quality (US EPA AQI) in Sullivan County?

Share of days with good air quality (US EPA AQI) in Sullivan County was 74.2% in 2020, according to EPA. That is up 11.3 pts from 2019.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Sullivan County?

100% in 1980, the highest value since 1980 in this series.

Related statistics for Sullivan County

All statistics for Sullivan County | Sullivan County in figures