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

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

Share of days with good air quality (US EPA AQI) in Adams County was 74.9% in 2020, according to EPA. That is down 15 pts from 2019.

202074.9%
Change on 2019-15 pts
Series high1001991
Series low21.32010

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Share of days with good air quality (US EPA AQI) in Adams County, 1987 to 2020

2040608010019871990199320102013201620201987: 96.8 %1988: 96.6 %1989: 93.4 %1990: 96.7 %1991: 100 %1992: 100 %1993: 98.3 %1994: 100 %1995: 98.7 %2010: 21.3 %2011: 53.3 %2012: 65.8 %2013: 72.1 %2014: 77.4 %2015: 82.7 %2016: 92.6 %2017: 93.4 %2018: 86.5 %2019: 89.9 %2020: 74.9 %204060801001987199420201987: 96.8 %1988: 96.6 %1989: 93.4 %1990: 96.7 %1991: 100 %1992: 100 %1993: 98.3 %1994: 100 %1995: 98.7 %2010: 21.3 %2011: 53.3 %2012: 65.8 %2013: 72.1 %2014: 77.4 %2015: 82.7 %2016: 92.6 %2017: 93.4 %2018: 86.5 %2019: 89.9 %2020: 74.9 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 20 values
Period%
202074.9
201989.9
201886.5
201793.4
201692.6
201582.7
201477.4
201372.1
201265.8
201153.3
201021.3
199598.7
1994100
199398.3
1992100
1991100
199096.7
198993.4
198896.6
198796.8

Adams County compared with nearby places

Adams County: 74.9 %Allen County: 80.3 %Ashtabula County: 92.9 %Athens County: 84.9 %Belmont County: 94.8 %Butler County: 76.2 %Clark County: 63.6 %Clermont County: 82 %Clinton County: 89.5 %Columbiana County: 100 %Cuyahoga County: 40.4 %Delaware County: 91 %Fayette County: 93.3 %Franklin County: 63.4 %Geauga County: 87.3 %Greene County: 89.8 %Hamilton County: 28.7 %Harrison County: 97 %Jefferson County: 73.3 %Knox County: 92.2 %Lake County: 80.9 %Lawrence County: 78.8 %Licking County: 93.9 %Lorain County: 80.7 %Lucas County: 70.6 %Madison County: 89.8 %Mahoning County: 68.8 %Medina County: 77.8 %Miami County: 94.8 %Montgomery County: 49 %Noble County: 93 %Portage County: 86.3 %Preble County: 71.6 %Scioto County: 94.8 %Stark County: 56.4 %Summit County: 53.5 %Trumbull County: 78.4 %Warren County: 68.7 %Washington County: 95.1 %Wood County: 94.3 %
  • Under 66
  • 66 to 76
  • 76 to 81
  • 81 to 90
  • 90 to 94
  • 94 and over
  • No data
Share of days with good air quality (US EPA AQI), 2020, %. Adams 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), Adams County, 1987 to 2020) [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), Adams County, 1987 to 2020. 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/adams-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), Adams County, 1987 to 2020. 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/adams-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), Adams County, 1987 to 2020 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/adams-county-ohio (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2020,
  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), Adams County, 1987 to 2020}},
  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/adams-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), Adams County, 1987 to 2020
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/adams-county-ohio
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/adams-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 Adams County?

Share of days with good air quality (US EPA AQI) in Adams County was 74.9% in 2020, according to EPA. That is down 15 pts from 2019.

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 Adams County?

100% in 1991, the highest value since 1987 in this series.

Related statistics for Adams County

All statistics for Adams County | Adams County in figures