Data / Highest daily Air Quality Index (US EPA) / Johnson County

Highest daily Air Quality Index (US EPA) in Johnson County

Highest daily Air Quality Index (US EPA) in Johnson County was 80 in 2017, according to the U.S. Environmental Protection Agency. That is down 20 from 2016.

2017, index80
Change on 2016-20
Series high2062002
Series low712014

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Highest daily Air Quality Index (US EPA) in Johnson County, 1987 to 2017

501001502002501987200020042008201220171987: 185 index1997: 174 index1998: 169 index1999: 185 index2000: 164 index2001: 151 index2002: 206 index2003: 164 index2004: 129 index2005: 164 index2006: 136 index2007: 161 index2008: 119 index2009: 126 index2010: 105 index2011: 100 index2012: 140 index2013: 93 index2014: 71 index2015: 90 index2016: 100 index2017: 80 index501001502002501987200420171987: 185 index1997: 174 index1998: 169 index1999: 185 index2000: 164 index2001: 151 index2002: 206 index2003: 164 index2004: 129 index2005: 164 index2006: 136 index2007: 161 index2008: 119 index2009: 126 index2010: 105 index2011: 100 index2012: 140 index2013: 93 index2014: 71 index2015: 90 index2016: 100 index2017: 80 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 22 values
Periodindex
201780
2016100
201590
201471
201393
2012140
2011100
2010105
2009126
2008119
2007161
2006136
2005164
2004129
2003164
2002206
2001151
2000164
1999185
1998169
1997174
1987185

Johnson County compared with nearby places

Allen County: 105 indexBartholomew County: 93 indexBoone County: 101 indexBrown County: 90 indexCarroll County: 77 indexClark County: 101 indexDelaware County: 112 indexDubois County: 72 indexElkhart County: 105 indexFloyd County: 115 indexGreene County: 101 indexHamilton County: 105 indexHendricks County: 93 indexHenry County: 66 indexHoward County: 83 indexHuntington County: 100 indexJackson County: 93 indexJohnson County: 80 indexKnox County: 100 indexLake County: 173 indexLaPorte County: 147 indexMadison County: 105 indexMarion County: 122 indexMonroe County: 66 indexMorgan County: 64 indexPerry County: 101 indexPorter County: 136 indexPosey County: 126 indexSt. Joseph County: 133 indexShelby County: 108 indexSpencer County: 71 indexSullivan County: 69 indexTippecanoe County: 83 indexVanderburgh County: 115 indexVigo County: 105 indexWabash County: 105 indexWarrick County: 112 indexWhitley County: 87 index
  • Under 78
  • 78 to 93
  • 93 to 100
  • 100 to 110
  • 110 to 120
  • 120 and over
  • No data
Highest daily Air Quality Index (US EPA), 2017, index. Johnson 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest daily AQI. 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/johnson-county-indiana. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/johnson-county-indiana.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/johnson-county-indiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2017,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017}},
  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/highest-daily-air-quality-index/johnson-county-indiana. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Johnson County, 1987 to 2017
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/highest-daily-air-quality-index/johnson-county-indiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/johnson-county-indiana.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the highest daily Air Quality Index (US EPA) in Johnson County?

Highest daily Air Quality Index (US EPA) in Johnson County was 80 in 2017, according to the U.S. Environmental Protection Agency. That is down 20 from 2016.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Johnson County?

206 in 2002, the highest value since 1987 in this series.

Related statistics for Johnson County

All statistics for Johnson County | Johnson County in figures