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

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

Share of days with good air quality (US EPA AQI) in Cooper County was 42.9% in 2006, according to EPA. That is up 5.2 pts from 2005.

200642.9%
Change on 2005+5.2 pts
Series high42.92006
Series low29.82004

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 Cooper County, 2002 to 2006

2530354045200220032004200520062002: 33.3 %2003: 31.4 %2004: 29.8 %2005: 37.7 %2006: 42.9 %25303540452002200420062002: 33.3 %2003: 31.4 %2004: 29.8 %2005: 37.7 %2006: 42.9 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 5 values
Period%
200642.9
200537.7
200429.8
200331.4
200233.3

Cooper County compared with nearby places

Boone County: 43.3 %Buchanan County: 30.1 %Cass County: 53.2 %Cedar County: 38.8 %Clay County: 40.5 %Clinton County: 65 %Cooper County: 42.9 %Greene County: 62.7 %Jackson County: 26.4 %Jasper County: 86.6 %Jefferson County: 25.3 %Lincoln County: 61.5 %Monroe County: 62.2 %Perry County: 62.6 %St. Charles County: 61.6 %Ste. Genevieve County: 39.9 %St. Louis County: 32.9 %Stoddard County: 51.6 %Taney County: 67.8 %St. Louis city: 5.5 %
  • Under 32
  • 32 to 42
  • 42 to 57
  • 57 to 63
  • 63 and over
  • No data
Share of days with good air quality (US EPA AQI), 2006, %. Cooper 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), Cooper County, 2002 to 2006) [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), Cooper County, 2002 to 2006. 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/cooper-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), Cooper County, 2002 to 2006. 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/cooper-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), Cooper County, 2002 to 2006 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/cooper-county-missouri (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2006,
  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), Cooper County, 2002 to 2006}},
  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/cooper-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), Cooper County, 2002 to 2006
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/cooper-county-missouri
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/cooper-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 Cooper County?

Share of days with good air quality (US EPA AQI) in Cooper County was 42.9% in 2006, according to EPA. That is up 5.2 pts from 2005.

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 Cooper County?

42.9% in 2006, the highest value since 2002 in this series.

Related statistics for Cooper County

All statistics for Cooper County | Cooper County in figures