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 2022, at 100%. Hennepin County had the lowest, at 66.8%. The median was 88.8%. Source: EPA.

Keep it in a collection in your library.
Highest100Mille Lacs County
Lowest66.8Hennepin County
Median88.821 counties

Map of counties, 2022

Anoka County: 79.2 %Becker County: 90.7 %Beltrami County: 91.9 %Carlton County: 98.9 %Cass County: 88.8 %Cook County: 99.1 %Crow Wing County: 88.8 %Dakota County: 78.4 %Goodhue County: 95.5 %Hennepin County: 66.8 %Lake County: 95.8 %Lyon County: 85.1 %Mille Lacs County: 100 %Olmsted County: 78 %Ramsey County: 73.2 %St. Louis County: 88.2 %Scott County: 77.3 %Stearns County: 73.6 %Washington County: 93.4 %Winona County: 93.4 %Wright County: 78.1 %
  • Under 78
  • 78 to 85
  • 85 to 91
  • 91 to 96
  • 96 and over
  • No data
%, 2022. 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, 2022

Mille Lacs County: 100 %Mille Lacs County100Cook County: 99.1 %Cook County99.1Carlton County: 98.9 %Carlton County98.9Lake County: 95.8 %Lake County95.8Goodhue County: 95.5 %Goodhue County95.5Washington County: 93.4 %Washington County93.4Winona County: 93.4 %Winona County93.4Beltrami County: 91.9 %Beltrami County91.9Becker County: 90.7 %Becker County90.7Cass County: 88.8 %Cass County88.8Crow Wing County: 88.8 %Crow Wing County88.8St. Louis County: 88.2 %St. Louis County88.2Lyon County: 85.1 %Lyon County85.1Anoka County: 79.2 %Anoka County79.2Dakota County: 78.4 %Dakota County78.4Wright County: 78.1 %Wright County78.1Olmsted County: 78 %Olmsted County78Scott County: 77.3 %Scott County77.3Stearns County: 73.6 %Stearns County73.6Ramsey County: 73.2 %Ramsey County73.2Hennepin County: 66.8 %Hennepin County66.8Mille Lacs County: 100 %Mille Lacs County100Cook County: 99.1 %Cook County99.1Carlton County: 98.9 %Carlton County98.9Lake County: 95.8 %Lake County95.8Goodhue County: 95.5 %Goodhue County95.5Washington County: 93.4 %Washington County93.4Winona County: 93.4 %Winona County93.4Beltrami County: 91.9 %Beltrami County91.9Becker County: 90.7 %Becker County90.7Cass County: 88.8 %Cass County88.8Crow Wing County: 88.8 %Crow Wing County88.8St. Louis County: 88.2 %St. Louis County88.2Lyon County: 85.1 %Lyon County85.1Anoka County: 79.2 %Anoka County79.2Dakota County: 78.4 %Dakota County78.4Wright County: 78.1 %Wright County78.1Olmsted County: 78 %Olmsted County78Scott County: 77.3 %Scott County77.3Stearns County: 73.6 %Stearns County73.6Ramsey County: 73.2 %Ramsey County73.2Hennepin County: 66.8 %Hennepin County66.8
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Mille Lacs County100+5.3 pts
2Cook County99.1+5.8 pts
3Carlton County98.9+11.8 pts
4Lake County95.8+8.8 pts
5Goodhue County95.5+6.3 pts
6Washington County93.4+3.1 pts
6Winona County93.4+6.3 pts
8Beltrami County91.9+9.5 pts
9Becker County90.7+49.5 pts
10Cass County88.8+59.5 pts
10Crow Wing County88.8+7.8 pts
12St. Louis County88.2+10.7 pts
13Lyon County85.1+11.8 pts
14Anoka County79.2+8.5 pts
15Dakota County78.4+9.4 pts
16Wright County78.1+12.8 pts
17Olmsted County78+1.8 pts
18Scott County77.3+2.4 pts
19Stearns County73.6+1.5 pts
20Ramsey County73.2+4.2 pts
21Hennepin County66.8+8.4 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 2022 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), 2022) [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), 2022. 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=2022. 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), 2022. 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=2022.

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), 2022 [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=2022 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_minnesota_by_2022,
  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), 2022}},
  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=2022. 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), 2022
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=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/minnesota-counties?period=2022.
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 100% in 2022, according to EPA.

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

Hennepin County, with 66.8% in 2022.

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 2022 and are not ranked.

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

Counties in Minnesota: more rankings