Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Minnesota

Counties in Minnesota by share of days with good air quality (US EPA AQI)

Mille Lacs County had the highest share of days with good air quality (US EPA AQI) of 21 counties in 2023, at 89.9%. Scott County had the lowest, at 47.4%. The median was 61.4%. Source: EPA.

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Highest89.9Mille Lacs County
Lowest47.4Scott County
Median61.421 counties

Map of counties, 2023

Anoka County: 59.5 %Becker County: 61.4 %Beltrami County: 68.6 %Carlton County: 73.5 %Cass County: 72.4 %Cook County: 86.1 %Crow Wing County: 66.8 %Dakota County: 50.4 %Goodhue County: 83.2 %Hennepin County: 47.4 %Lake County: 77.3 %Lyon County: 57.1 %Mille Lacs County: 89.9 %Olmsted County: 51.8 %Ramsey County: 51.5 %St. Louis County: 60.5 %Scott County: 47.4 %Stearns County: 54.5 %Washington County: 80.8 %Winona County: 79.8 %Wright County: 52.4 %
  • Under 52
  • 52 to 60
  • 60 to 69
  • 69 to 80
  • 80 and over
  • No data
%, 2023. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Mille Lacs County: 89.9 %Mille Lacs County89.9Cook County: 86.1 %Cook County86.1Goodhue County: 83.2 %Goodhue County83.2Washington County: 80.8 %Washington County80.8Winona County: 79.8 %Winona County79.8Lake County: 77.3 %Lake County77.3Carlton County: 73.5 %Carlton County73.5Cass County: 72.4 %Cass County72.4Beltrami County: 68.6 %Beltrami County68.6Crow Wing County: 66.8 %Crow Wing County66.8Becker County: 61.4 %Becker County61.4St. Louis County: 60.5 %St. Louis County60.5Anoka County: 59.5 %Anoka County59.5Lyon County: 57.1 %Lyon County57.1Stearns County: 54.5 %Stearns County54.5Wright County: 52.4 %Wright County52.4Olmsted County: 51.8 %Olmsted County51.8Ramsey County: 51.5 %Ramsey County51.5Dakota County: 50.4 %Dakota County50.4Hennepin County: 47.4 %Hennepin County47.4Scott County: 47.4 %Scott County47.4Mille Lacs County: 89.9 %Mille Lacs County89.9Cook County: 86.1 %Cook County86.1Goodhue County: 83.2 %Goodhue County83.2Washington County: 80.8 %Washington County80.8Winona County: 79.8 %Winona County79.8Lake County: 77.3 %Lake County77.3Carlton County: 73.5 %Carlton County73.5Cass County: 72.4 %Cass County72.4Beltrami County: 68.6 %Beltrami County68.6Crow Wing County: 66.8 %Crow Wing County66.8Becker County: 61.4 %Becker County61.4St. Louis County: 60.5 %St. Louis County60.5Anoka County: 59.5 %Anoka County59.5Lyon County: 57.1 %Lyon County57.1Stearns County: 54.5 %Stearns County54.5Wright County: 52.4 %Wright County52.4Olmsted County: 51.8 %Olmsted County51.8Ramsey County: 51.5 %Ramsey County51.5Dakota County: 50.4 %Dakota County50.4Hennepin County: 47.4 %Hennepin County47.4Scott County: 47.4 %Scott County47.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Mille Lacs County89.9-10.1 pts
2Cook County86.1-13 pts
3Goodhue County83.2-12.3 pts
4Washington County80.8-12.6 pts
5Winona County79.8-13.6 pts
6Lake County77.3-18.5 pts
7Carlton County73.5-25.4 pts
8Cass County72.4-16.4 pts
9Beltrami County68.6-23.3 pts
10Crow Wing County66.8-22 pts
11Becker County61.4-29.3 pts
12St. Louis County60.5-27.7 pts
13Anoka County59.5-19.7 pts
14Lyon County57.1-28 pts
15Stearns County54.5-19.1 pts
16Wright County52.4-25.7 pts
17Olmsted County51.8-26.2 pts
18Ramsey County51.5-21.7 pts
19Dakota County50.4-28 pts
20Hennepin County47.4-19.4 pts
20Scott County47.4-29.9 pts

Other periods

About this ranking

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.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 19 counties with data in other periods have no value for 2023 and are left out rather than filled from another source. Equal values share a rank.

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 (Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023) [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, Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/minnesota-counties?period=2023. 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. Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/minnesota-counties?period=2023.

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, Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/minnesota-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_minnesota_by_2023,
  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: Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023}},
  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/rankings/good-air-quality-days-share/minnesota-counties?period=2023. 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: Counties in Minnesota by share of days with good air quality (US EPA AQI), 2023
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/rankings/good-air-quality-days-share/minnesota-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/minnesota-counties?period=2023.
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

Which county has the highest share of days with good air quality (US EPA AQI)?

Mille Lacs County, with 89.9% in 2023, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Scott County, with 47.4% in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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 2026-10-12. 19 counties have no value for 2023 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in Minnesota: more rankings