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

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

Share of days with good air quality (US EPA AQI) in Audrain County was 100% in 1998, according to EPA. That is unchanged from 1997.

1998100%
Change on 19970 pts
Series high1001986
Series low881985

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 Audrain County, 1985 to 1998

87.59092.59597.510019851987198919911993199519981985: 88 %1986: 100 %1987: 97.9 %1988: 100 %1989: 98 %1990: 100 %1991: 100 %1992: 98.3 %1993: 100 %1994: 98.4 %1995: 96.4 %1996: 100 %1997: 100 %1998: 100 %8590951001985199019981985: 88 %1986: 100 %1987: 97.9 %1988: 100 %1989: 98 %1990: 100 %1991: 100 %1992: 98.3 %1993: 100 %1994: 98.4 %1995: 96.4 %1996: 100 %1997: 100 %1998: 100 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 14 values
Period%
1998100
1997100
1996100
199596.4
199498.4
1993100
199298.3
1991100
1990100
198998
1988100
198797.9
1986100
198588

Audrain County compared with nearby places

Audrain County: 100 %Buchanan County: 76.2 %Cedar County: 47.8 %Clay County: 71 %Greene County: 78.9 %Jackson County: 77.8 %Jefferson County: 57.6 %Monroe County: 63.8 %Platte County: 77.2 %St. Charles County: 68.8 %Ste. Genevieve County: 49.1 %St. Louis County: 69.6 %St. Louis city: 68.2 %
  • Under 60
  • 60 to 69
  • 69 to 72
  • 72 to 78
  • 78 and over
  • No data
Share of days with good air quality (US EPA AQI), 1998, %. Audrain 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), Audrain County, 1985 to 1998) [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), Audrain County, 1985 to 1998. 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/audrain-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), Audrain County, 1985 to 1998. 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/audrain-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), Audrain County, 1985 to 1998 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/audrain-county-missouri (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_1998,
  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), Audrain County, 1985 to 1998}},
  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/audrain-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), Audrain County, 1985 to 1998
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/audrain-county-missouri
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/audrain-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 Audrain County?

Share of days with good air quality (US EPA AQI) in Audrain County was 100% in 1998, according to EPA. That is unchanged from 1997.

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 Audrain County?

100% in 1986, the highest value since 1985 in this series.

Related statistics for Audrain County

All statistics for Audrain County | Audrain County in figures