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

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

Highest daily Air Quality Index (US EPA) in Vermillion County was 30 in 1998, according to the U.S. Environmental Protection Agency. That is down 16 from 1997.

1998, index30
Change on 1997-16
Series high1241988
Series low301998

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 Vermillion County, 1988 to 1998

204060801001201401988199019921994199619981988: 124 index1989: 91 index1990: 78 index1991: 89 index1992: 65 index1993: 57 index1994: 54 index1995: 55 index1996: 52 index1997: 46 index1998: 30 index2550751001251988199219981988: 124 index1989: 91 index1990: 78 index1991: 89 index1992: 65 index1993: 57 index1994: 54 index1995: 55 index1996: 52 index1997: 46 index1998: 30 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
199830
199746
199652
199555
199454
199357
199265
199189
199078
198991
1988124

Vermillion County compared with nearby places

Allen County: 177 indexClark County: 228 indexDeKalb County: 59 indexDubois County: 47 indexElkhart County: 190 indexFloyd County: 215 indexHamilton County: 207 indexHancock County: 203 indexHendricks County: 149 indexJasper County: 91 indexJohnson County: 169 indexKnox County: 200 indexLake County: 201 indexLaPorte County: 204 indexMadison County: 203 indexMarion County: 192 indexMorgan County: 179 indexPerry County: 201 indexPorter County: 207 indexPosey County: 206 indexSt. Joseph County: 195 indexSpencer County: 122 indexVanderburgh County: 206 indexVermillion County: 30 indexVigo County: 169 indexWabash County: 185 indexWarrick County: 215 index
  • Under 150
  • 150 to 190
  • 190 to 200
  • 200 to 210
  • 210 and over
  • No data
Highest daily Air Quality Index (US EPA), 1998, index. Vermillion 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), Vermillion County, 1988 to 1998) [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), Vermillion County, 1988 to 1998. 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/vermillion-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), Vermillion County, 1988 to 1998. 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/vermillion-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), Vermillion County, 1988 to 1998 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/vermillion-county-indiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_1998,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Vermillion County, 1988 to 1998}},
  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/vermillion-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), Vermillion County, 1988 to 1998
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/vermillion-county-indiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/vermillion-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 Vermillion County?

Highest daily Air Quality Index (US EPA) in Vermillion County was 30 in 1998, according to the U.S. Environmental Protection Agency. That is down 16 from 1997.

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 Vermillion County?

124 in 1988, the highest value since 1988 in this series.

Related statistics for Vermillion County

All statistics for Vermillion County | Vermillion County in figures