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

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

Share of days with good air quality (US EPA AQI) in Hancock County was 100% in 2011, according to EPA. That is unchanged from 2010.

2011100%
Change on 20100 pts
Series high1001991
Series low1001991

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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Share of days with good air quality (US EPA AQI) in Hancock County, 1991 to 2011

909510010511019911994199720002003200620111991: 100 %1992: 100 %1993: 100 %1994: 100 %1995: 100 %1996: 100 %1997: 100 %1998: 100 %1999: 100 %2000: 100 %2001: 100 %2002: 100 %2003: 100 %2004: 100 %2005: 100 %2006: 100 %2007: 100 %2008: 100 %2009: 100 %2010: 100 %2011: 100 %909510010511019911998200520111991: 100 %1992: 100 %1993: 100 %1994: 100 %1995: 100 %1996: 100 %1997: 100 %1998: 100 %1999: 100 %2000: 100 %2001: 100 %2002: 100 %2003: 100 %2004: 100 %2005: 100 %2006: 100 %2007: 100 %2008: 100 %2009: 100 %2010: 100 %2011: 100 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 21 values
Period%
2011100
2010100
2009100
2008100
2007100
2006100
2005100
2004100
2003100
2002100
2001100
2000100
1999100
1998100
1997100
1996100
1995100
1994100
1993100
1992100
1991100

Hancock County compared with nearby places

Adams County: 53.3 %Allen County: 67.6 %Ashtabula County: 72.5 %Athens County: 80.1 %Butler County: 56.2 %Clark County: 38.4 %Clermont County: 33.4 %Clinton County: 61.2 %Columbiana County: 100 %Cuyahoga County: 14.5 %Delaware County: 72.9 %Fayette County: 82.4 %Franklin County: 31.2 %Geauga County: 80.3 %Greene County: 46.9 %Hamilton County: 28.5 %Hancock County: 100 %Jefferson County: 32.6 %Knox County: 77.6 %Lake County: 49.3 %Lawrence County: 27.2 %Licking County: 73.8 %Lorain County: 57.2 %Lucas County: 45.2 %Madison County: 68.5 %Mahoning County: 37.8 %Medina County: 61.8 %Miami County: 67.8 %Montgomery County: 36.2 %Noble County: 79.9 %Portage County: 67.2 %Preble County: 39.5 %Scioto County: 81.1 %Stark County: 29.9 %Summit County: 53.2 %Trumbull County: 40.9 %Warren County: 27.1 %Washington County: 74.9 %Wood County: 77.6 %
  • Under 33
  • 33 to 44
  • 44 to 57
  • 57 to 70
  • 70 to 79
  • 79 and over
  • No data
Share of days with good air quality (US EPA AQI), 2011, %. 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

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), 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: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/hancock-county-ohio. 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), 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/good-air-quality-days-share/hancock-county-ohio.

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), Hancock County, 1991 to 2011 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/hancock-county-ohio (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2011,
  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), 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/good-air-quality-days-share/hancock-county-ohio. 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), 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/good-air-quality-days-share/hancock-county-ohio
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/hancock-county-ohio.
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 Hancock County?

Share of days with good air quality (US EPA AQI) in Hancock County was 100% in 2011, according to EPA. That is unchanged from 2010.

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 Hancock County?

100% in 1991, the highest value since 1991 in this series.

Related statistics for Hancock County

All statistics for Hancock County | Hancock County in figures