Data / Median Air Quality Index (US EPA) / Florence County

Median Air Quality Index (US EPA) in Florence County

Median Air Quality Index (US EPA) in Florence County was 34 in 2010, according to the U.S. Environmental Protection Agency. That is down 2 from 2009.

2010, index34
Change on 2009-2
Series high411998
Series low301992

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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Median Air Quality Index (US EPA) in Florence County, 1987 to 2010

3032.53537.54042.519871991199519992003200720101987: 33 index1988: 39 index1989: 40 index1990: 33 index1991: 34 index1992: 30 index1993: 31 index1994: 36 index1995: 34 index1996: 38 index1997: 33 index1998: 41 index1999: 38 index2000: 37 index2001: 39 index2002: 38 index2003: 41 index2004: 37 index2005: 39 index2006: 37 index2007: 37 index2008: 37 index2009: 36 index2010: 34 index3035404519871995200320101987: 33 index1988: 39 index1989: 40 index1990: 33 index1991: 34 index1992: 30 index1993: 31 index1994: 36 index1995: 34 index1996: 38 index1997: 33 index1998: 41 index1999: 38 index2000: 37 index2001: 39 index2002: 38 index2003: 41 index2004: 37 index2005: 39 index2006: 37 index2007: 37 index2008: 37 index2009: 36 index2010: 34 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 24 values
Periodindex
201034
200936
200837
200737
200637
200539
200437
200341
200238
200139
200037
199938
199841
199733
199638
199534
199436
199331
199230
199134
199033
198940
198839
198733

Florence County compared with nearby places

Ashland County: 34 indexBrown County: 46 indexChippewa County: 8 indexColumbia County: 40 indexDane County: 55 indexDodge County: 46 indexDoor County: 37 indexEau Claire County: 40 indexFlorence County: 34 indexFond du Lac County: 39 indexForest County: 36 indexGrant County: 49 indexJefferson County: 41 indexKenosha County: 47 indexKewaunee County: 39 indexLa Crosse County: 42 indexManitowoc County: 38 indexMarathon County: 38 indexMilwaukee County: 44 indexOneida County: 36 indexOutagamie County: 40 indexOzaukee County: 42 indexRacine County: 42 indexRock County: 41 indexSt. Croix County: 42 indexSauk County: 40 indexSheboygan County: 41 indexTaylor County: 36 indexVernon County: 39 indexVilas County: 37 indexWalworth County: 41 indexWashington County: 39 indexWaukesha County: 41 index
  • Under 36
  • 36 to 39
  • 39 to 40
  • 40 to 41
  • 41 to 43
  • 43 and over
  • No data
Median Air Quality Index (US EPA), 2010, index. Florence 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

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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: median daily AQI. 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: median daily AQI (Median Air Quality Index (US EPA), Florence County, 1987 to 2010) [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: median daily AQI, Median Air Quality Index (US EPA), Florence County, 1987 to 2010. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/florence-county-wisconsin. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Florence County, 1987 to 2010. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/florence-county-wisconsin.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Florence County, 1987 to 2010 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/florence-county-wisconsin (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2010,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Florence County, 1987 to 2010}},
  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/median-air-quality-index/florence-county-wisconsin. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI: Median Air Quality Index (US EPA), Florence County, 1987 to 2010
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/median-air-quality-index/florence-county-wisconsin
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/florence-county-wisconsin.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the median Air Quality Index (US EPA) in Florence County?

Median Air Quality Index (US EPA) in Florence County was 34 in 2010, according to the U.S. Environmental Protection Agency. That is down 2 from 2009.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Florence County?

41 in 1998, the highest value since 1987 in this series.

Related statistics for Florence County

All statistics for Florence County | Florence County in figures