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

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

Share of days with good air quality (US EPA AQI) in Green County was 90.9% in 2004, according to EPA. That is up 27.3 pts from 2003.

200490.9%
Change on 2003+27.3 pts
Series high90.92004
Series low63.62003

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Share of days with good air quality (US EPA AQI) in Green County, 2000 to 2004

60708090100200020012002200320042000: 79.2 %2001: 68.9 %2002: 65.2 %2003: 63.6 %2004: 90.9 %607080901002000200220042000: 79.2 %2001: 68.9 %2002: 65.2 %2003: 63.6 %2004: 90.9 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 5 values
Period%
200490.9
200363.6
200265.2
200168.9
200079.2

Green County compared with nearby places

Ashland County: 93.2 %Brown County: 69 %Columbia County: 88 %Dane County: 67.6 %Dodge County: 53.7 %Door County: 78.9 %Douglas County: 100 %Eau Claire County: 100 %Florence County: 91.2 %Fond du Lac County: 87.4 %Forest County: 92.8 %Grant County: 50 %Green County: 90.9 %Jefferson County: 84.4 %Kenosha County: 62.3 %Kewaunee County: 84.8 %Manitowoc County: 74.2 %Marathon County: 89.1 %Milwaukee County: 68.9 %Oneida County: 89.8 %Outagamie County: 71.3 %Ozaukee County: 71.7 %Racine County: 84.6 %Rock County: 82.8 %St. Croix County: 84 %Sauk County: 79.1 %Sheboygan County: 82.6 %Taylor County: 84.2 %Vernon County: 88.5 %Vilas County: 86.7 %Walworth County: 79.3 %Washington County: 84.6 %Waukesha County: 67.7 %Waupaca County: 62.5 %
  • Under 68
  • 68 to 79
  • 79 to 84
  • 84 to 87
  • 87 to 90
  • 90 and over
  • No data
Share of days with good air quality (US EPA AQI), 2004, %. Green 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), Green County, 2000 to 2004) [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), Green County, 2000 to 2004. 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/green-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), Green County, 2000 to 2004. 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/green-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), Green County, 2000 to 2004 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/green-county-wisconsin (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2004,
  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), Green County, 2000 to 2004}},
  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/green-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), Green County, 2000 to 2004
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/green-county-wisconsin
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/green-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 Green County?

Share of days with good air quality (US EPA AQI) in Green County was 90.9% in 2004, according to EPA. That is up 27.3 pts from 2003.

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 Green County?

90.9% in 2004, the highest value since 2000 in this series.

Related statistics for Green County

All statistics for Green County | Green County in figures