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

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

Highest daily Air Quality Index (US EPA) in Hancock County was 43 in 2011, according to the U.S. Environmental Protection Agency. That is up 4 from 2010.

2011, index43
Change on 2010+4
Series high451994
Series low312008

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 Hancock County, 1991 to 2011

3035404519911994199720002003200620111991: 44 index1992: 44 index1993: 44 index1994: 45 index1995: 44 index1996: 44 index1997: 44 index1998: 42 index1999: 33 index2000: 44 index2001: 38 index2002: 38 index2003: 36 index2004: 39 index2005: 42 index2006: 40 index2007: 33 index2008: 31 index2009: 39 index2010: 39 index2011: 43 index3035404519911998200520111991: 44 index1992: 44 index1993: 44 index1994: 45 index1995: 44 index1996: 44 index1997: 44 index1998: 42 index1999: 33 index2000: 44 index2001: 38 index2002: 38 index2003: 36 index2004: 39 index2005: 42 index2006: 40 index2007: 33 index2008: 31 index2009: 39 index2010: 39 index2011: 43 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 21 values
Periodindex
201143
201039
200939
200831
200733
200640
200542
200439
200336
200238
200138
200044
199933
199842
199744
199644
199544
199445
199344
199244
199144

Hancock County compared with nearby places

Adams County: 105 indexAllen County: 119 indexAshtabula County: 154 indexAthens County: 115 indexButler County: 172 indexClark County: 140 indexClermont County: 179 indexClinton County: 161 indexColumbiana County: 37 indexCuyahoga County: 157 indexDelaware County: 126 indexFayette County: 140 indexFranklin County: 156 indexGeauga County: 129 indexGreene County: 136 indexHamilton County: 179 indexHancock County: 43 indexJefferson County: 115 indexKnox County: 147 indexLake County: 161 indexLawrence County: 126 indexLicking County: 140 indexLorain County: 136 indexLucas County: 147 indexMadison County: 143 indexMahoning County: 140 indexMedina County: 129 indexMiami County: 126 indexMontgomery County: 172 indexNoble County: 97 indexPortage County: 122 indexPreble County: 136 indexScioto County: 94 indexStark County: 154 indexSummit County: 150 indexTrumbull County: 140 indexWarren County: 166 indexWashington County: 143 indexWood County: 129 index
  • Under 120
  • 120 to 130
  • 130 to 140
  • 140 to 150
  • 150 to 160
  • 160 and over
  • No data
Highest daily Air Quality Index (US EPA), 2011, index. Hancock 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), Hancock County, 1991 to 2011) [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), Hancock County, 1991 to 2011. 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/hancock-county-ohio. 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), Hancock County, 1991 to 2011. 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/hancock-county-ohio.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Hancock County, 1991 to 2011 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/hancock-county-ohio (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2011,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Hancock County, 1991 to 2011}},
  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/hancock-county-ohio. 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), Hancock County, 1991 to 2011
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/hancock-county-ohio
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/hancock-county-ohio.
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 Hancock County?

Highest daily Air Quality Index (US EPA) in Hancock County was 43 in 2011, according to the U.S. Environmental Protection Agency. That is up 4 from 2010.

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 Hancock County?

45 in 1994, the highest value since 1991 in this series.

Related statistics for Hancock County

All statistics for Hancock County | Hancock County in figures