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

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

Share of days with good air quality (US EPA AQI) in Chippewa County was 98.4% in 2013, according to EPA. That is down 1.6 pts from 2012. That is the 4th highest of 32 counties in 2013.

201398.4%
Change on 2012-1.6 pts
Rank4th of 32Counties in Wisconsin ranked
Series high1001990
Series low86.31980

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 Chippewa County, 1980 to 2013

8590951001980199020102011201220131980: 86.3 %1990: 100 %2010: 100 %2011: 100 %2012: 100 %2013: 98.4 %8590951001980201020131980: 86.3 %1990: 100 %2010: 100 %2011: 100 %2012: 100 %2013: 98.4 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 6 values
Period%
201398.4
2012100
2011100
2010100
1990100
198086.3

Chippewa County compared with nearby places

Ashland County: 95.6 %Barron County: 93.7 %Brown County: 63 %Chippewa County: 98.4 %Columbia County: 81.7 %Dane County: 49.9 %Dodge County: 57.3 %Door County: 79.5 %Eau Claire County: 71.2 %Fond du Lac County: 88.4 %Forest County: 82.9 %Grant County: 61.5 %Jackson County: 100 %Jefferson County: 80.3 %Kenosha County: 47.6 %Kewaunee County: 78.4 %La Crosse County: 52.9 %Manitowoc County: 73.2 %Marathon County: 85.2 %Milwaukee County: 40 %Monroe County: 100 %Outagamie County: 57.8 %Ozaukee County: 65.3 %Racine County: 83.9 %Rock County: 76.8 %Sauk County: 67.3 %Sheboygan County: 66.8 %Taylor County: 71.2 %Trempealeau County: 100 %Vilas County: 91.4 %Walworth County: 85.1 %Waukesha County: 53.3 %
  • Under 57
  • 57 to 67
  • 67 to 78
  • 78 to 84
  • 84 to 93
  • 93 and over
  • No data
Share of days with good air quality (US EPA AQI), 2013, %. Chippewa 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), Chippewa County, 1980 to 2013) [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), Chippewa County, 1980 to 2013. 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/chippewa-county-wisconsin. 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), Chippewa County, 1980 to 2013. 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/chippewa-county-wisconsin.

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), Chippewa County, 1980 to 2013 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/chippewa-county-wisconsin (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2013,
  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), Chippewa County, 1980 to 2013}},
  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/chippewa-county-wisconsin. 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), Chippewa County, 1980 to 2013
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/chippewa-county-wisconsin
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/chippewa-county-wisconsin.
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 Chippewa County?

Share of days with good air quality (US EPA AQI) in Chippewa County was 98.4% in 2013, according to EPA. That is down 1.6 pts from 2012. That is the 4th highest of 32 counties in 2013.

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 Chippewa County?

100% in 1990, the highest value since 1980 in this series.

Related statistics for Chippewa County

All statistics for Chippewa County | Chippewa County in figures