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

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

Share of days with good air quality (US EPA AQI) in Daviess County was 61.9% in 2025, according to EPA. That is down 15.6 pts from 2024. That is the 20th highest of 36 counties in 2004.

202561.9%
Change on 2024-15.6 pts
Rank20th of 36Counties in Kentucky ranked
Series high891991
Series low31.62010

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Get an email when a new figure is out or this one is revised.

Share of days with good air quality (US EPA AQI) in Daviess County, 1980 to 2025

2040608010019801987199420012008201520251980: 78.1 %1981: 87.2 %1982: 70.4 %1983: 66.8 %1984: 75.1 %1985: 78.4 %1986: 75.9 %1987: 67.1 %1988: 69.1 %1989: 76.6 %1990: 78.1 %1991: 89 %1992: 82 %1993: 79.2 %1994: 75.6 %1995: 72.6 %1996: 79.5 %1997: 75 %1998: 71.5 %1999: 54.8 %2000: 67.9 %2001: 62.9 %2002: 58.4 %2003: 66.3 %2004: 68.9 %2005: 53.8 %2006: 63.8 %2007: 34.5 %2008: 43.3 %2009: 44.4 %2010: 31.6 %2011: 44.9 %2012: 52.2 %2013: 58.9 %2014: 61.6 %2015: 46.6 %2016: 34.7 %2017: 45.3 %2018: 57.7 %2019: 60.4 %2020: 69.4 %2021: 55.1 %2022: 63 %2023: 45.4 %2024: 77.5 %2025: 61.9 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Period%
202561.9
202477.5
202345.4
202263
202155.1
202069.4
201960.4
201857.7
201745.3
201634.7
201546.6
201461.6
201358.9
201252.2
201144.9
201031.6
200944.4
200843.3
200734.5
200663.8
200553.8
200468.9
200366.3
200258.4
200162.9
200067.9
199954.8
199871.5
199775
199679.5
199572.6
199475.6
199379.2
199282
199189
199078.1
198976.6
198869.1
198767.1
198675.9
198578.4
198475.1
198366.8
198270.4
198187.2
198078.1

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.

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), Daviess County, 1980 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: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), Daviess County, 1980 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/good-air-quality-days-share/daviess-county-kentucky. 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), Daviess County, 1980 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/good-air-quality-days-share/daviess-county-kentucky.

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), Daviess County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/daviess-county-kentucky (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2025,
  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), Daviess County, 1980 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/good-air-quality-days-share/daviess-county-kentucky. 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), Daviess County, 1980 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/good-air-quality-days-share/daviess-county-kentucky
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/daviess-county-kentucky.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest share of days with good air quality (US EPA AQI) in Daviess County? Cite the source.
get_value {"indicator":"aqi_good_days_share","place":"us-county-21059"}
GET https://invokely.ai/api/v1/value?indicator=aqi_good_days_share&place=us-county-21059

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the share of days with good air quality (US EPA AQI) in Daviess County?

Share of days with good air quality (US EPA AQI) in Daviess County was 61.9% in 2025, according to EPA. That is down 15.6 pts from 2024. That is the 20th highest of 36 counties in 2004.

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 Daviess County?

89% in 1991, the highest value since 1980 in this series.

Related statistics for Daviess County

All statistics for Daviess County | Daviess County in figures