Data / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Scioto County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County was 0.5% in 2025, according to EPA. That is up 0.5 pts from 2024.

20250.5%
Change on 2024+0.5 pts
Series high5.31999
Series low01988

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 unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County, 1988 to 2025

024619881994200020062012201820251988: 0 %1989: 0 %1990: 0 %1991: 0.3 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0 %1998: 0 %1999: 5.3 %2000: 1.5 %2001: 5.2 %2002: 3.3 %2003: 0.8 %2004: 2 %2005: 1.1 %2006: 0.5 %2007: 0.8 %2008: 0 %2009: 0 %2010: 0 %2011: 0 %2012: 0 %2013: 0 %2014: 0 %2015: 0 %2016: 0.3 %2017: 0 %2018: 0 %2019: 0 %2020: 0 %2021: 0 %2022: 0 %2023: 1.9 %2024: 0 %2025: 0.5 %024619882001201420251988: 0 %1989: 0 %1990: 0 %1991: 0.3 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0 %1998: 0 %1999: 5.3 %2000: 1.5 %2001: 5.2 %2002: 3.3 %2003: 0.8 %2004: 2 %2005: 1.1 %2006: 0.5 %2007: 0.8 %2008: 0 %2009: 0 %2010: 0 %2011: 0 %2012: 0 %2013: 0 %2014: 0 %2015: 0 %2016: 0.3 %2017: 0 %2018: 0 %2019: 0 %2020: 0 %2021: 0 %2022: 0 %2023: 1.9 %2024: 0 %2025: 0.5 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 38 values
Period%
20250.5
20240
20231.9
20220
20210
20200
20190
20180
20170
20160.3
20150
20140
20130
20120
20110
20100
20090
20080
20070.8
20060.5
20051.1
20042
20030.8
20023.3
20015.2
20001.5
19995.3
19980
19970
19960
19950
19940
19930
19920
19910.3
19900
19890
19880

Scioto County compared with nearby places

Allen County: 0.3 %Ashtabula County: 1.2 %Athens County: 0 %Belmont County: 0.6 %Butler County: 1.4 %Clark County: 0.6 %Clermont County: 0.8 %Clinton County: 1.2 %Columbiana County: 0 %Cuyahoga County: 1.1 %Delaware County: 1.2 %Franklin County: 1.4 %Geauga County: 0.4 %Greene County: 0.8 %Hamilton County: 3.6 %Jefferson County: 0.3 %Knox County: 0.8 %Lake County: 1.4 %Lawrence County: 0 %Licking County: 0.4 %Lorain County: 0.4 %Lucas County: 2.5 %Madison County: 2 %Mahoning County: 0.6 %Medina County: 0.6 %Miami County: 0.4 %Montgomery County: 1.1 %Noble County: 0 %Portage County: 0.8 %Preble County: 0.5 %Scioto County: 0.5 %Stark County: 0.5 %Summit County: 0.8 %Trumbull County: 1.4 %Warren County: 1.9 %Washington County: 0.8 %Wood County: 0.4 %
  • Under 0.4
  • 0.4 to 0.5
  • 0.5 to 0.8
  • 0.8 to 1.1
  • 1.1 to 1.4
  • 1.4 and over
  • No data
Share of days unhealthy for sensitive groups or worse (US EPA AQI), 2025, %. Scioto 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 above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) 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; the counts are stored with each value.

Use the share rather than the number of days to compare counties, since the days with an AQI differ. 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: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025) [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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/scioto-county-ohio. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/scioto-county-ohio.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/unhealthy-air-quality-days-share/scioto-county-ohio (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_unhealthy_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025}},
  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/unhealthy-air-quality-days-share/scioto-county-ohio. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Scioto County, 1988 to 2025
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/unhealthy-air-quality-days-share/scioto-county-ohio
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/scioto-county-ohio.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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 unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County?

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County was 0.5% in 2025, according to EPA. That is up 0.5 pts from 2024.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: days with an AQI above 100 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 unhealthy for sensitive groups or worse (US EPA AQI) in Scioto County?

5.3% in 1999, the highest value since 1988 in this series.

Related statistics for Scioto County

All statistics for Scioto County | Scioto County in figures