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

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

Share of days with good air quality (US EPA AQI) in Clinton County was 84.6% in 2025, according to EPA. That is down 0.9 pts from 2024. That is the 10th highest of 21 counties in 2025.

202584.6%
Change on 2024-0.9 pts
Rank10th of 21Counties in Missouri ranked
Series high92.22020
Series low57.52012

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Share of days with good air quality (US EPA AQI) in Clinton County, 2004 to 2025

50607080901002004200820122016202020252004: 78.9 %2005: 60.3 %2006: 65 %2007: 64 %2008: 81.3 %2009: 80.8 %2010: 71.5 %2011: 71 %2012: 57.5 %2013: 77.1 %2014: 83.9 %2015: 78 %2016: 82.2 %2017: 80.8 %2018: 78.4 %2019: 86.9 %2020: 92.2 %2021: 90.2 %2022: 86.1 %2023: 68.6 %2024: 85.5 %2025: 84.6 %50607080901002004201220252004: 78.9 %2005: 60.3 %2006: 65 %2007: 64 %2008: 81.3 %2009: 80.8 %2010: 71.5 %2011: 71 %2012: 57.5 %2013: 77.1 %2014: 83.9 %2015: 78 %2016: 82.2 %2017: 80.8 %2018: 78.4 %2019: 86.9 %2020: 92.2 %2021: 90.2 %2022: 86.1 %2023: 68.6 %2024: 85.5 %2025: 84.6 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 22 values
Period%
202584.6
202485.5
202368.6
202286.1
202190.2
202092.2
201986.9
201878.4
201780.8
201682.2
201578
201483.9
201377.1
201257.5
201171
201071.5
200980.8
200881.3
200764
200665
200560.3
200478.9

Clinton County compared with nearby places

Andrew County: 86.9 %Boone County: 93.1 %Buchanan County: 56.4 %Callaway County: 89.6 %Cass County: 77.6 %Cedar County: 81.6 %Clay County: 74.4 %Clinton County: 84.6 %Greene County: 62.6 %Jackson County: 57.3 %Jasper County: 83.6 %Jefferson County: 73.4 %Lincoln County: 85 %Monroe County: 94 %Perry County: 84.7 %St. Charles County: 80.3 %Ste. Genevieve County: 91.4 %St. Louis County: 73.4 %Stoddard County: 100 %Taney County: 89.8 %St. Louis city: 34.2 %
  • Under 73
  • 73 to 80
  • 80 to 85
  • 85 to 90
  • 90 and over
  • No data
Share of days with good air quality (US EPA AQI), 2025, %. Clinton 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), Clinton County, 2004 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), Clinton County, 2004 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/clinton-county-missouri. 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), Clinton County, 2004 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/clinton-county-missouri.

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), Clinton County, 2004 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/clinton-county-missouri (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), Clinton County, 2004 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/clinton-county-missouri. 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), Clinton County, 2004 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/clinton-county-missouri
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/clinton-county-missouri.
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 Clinton County?

Share of days with good air quality (US EPA AQI) in Clinton County was 84.6% in 2025, according to EPA. That is down 0.9 pts from 2024. That is the 10th highest of 21 counties in 2025.

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 Clinton County?

92.2% in 2020, the highest value since 2004 in this series.

Related statistics for Clinton County

All statistics for Clinton County | Clinton County in figures