Data / Highest daily Air Quality Index (US EPA) / Marquette County

Highest daily Air Quality Index (US EPA) in Marquette County

Highest daily Air Quality Index (US EPA) in Marquette County was 193 in 2025, according to the U.S. Environmental Protection Agency. That is up 126 from 2024.

2025, index193
Change on 2024+126
Series high1932025
Series low171998

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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Highest daily Air Quality Index (US EPA) in Marquette County, 1980 to 2025

05010015020019801989199119931995199720251980: 169 index1981: 147 index1989: 55 index1990: 62 index1991: 90 index1992: 49 index1993: 77 index1994: 44 index1995: 60 index1996: 86 index1997: 51 index1998: 17 index2024: 67 index2025: 193 index0501001502001980199220251980: 169 index1981: 147 index1989: 55 index1990: 62 index1991: 90 index1992: 49 index1993: 77 index1994: 44 index1995: 60 index1996: 86 index1997: 51 index1998: 17 index2024: 67 index2025: 193 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 14 values
Periodindex
2025193
202467
199817
199751
199686
199560
199444
199377
199249
199190
199062
198955
1981147
1980169

Marquette County compared with nearby places

Allegan County: 151 indexBay County: 139 indexBenzie County: 80 indexBerrien County: 147 indexCass County: 115 indexClinton County: 119 indexGenesee County: 126 indexHuron County: 108 indexIngham County: 153 indexKalamazoo County: 156 indexKent County: 163 indexKeweenaw County: 31 indexLenawee County: 147 indexMacomb County: 166 indexManistee County: 167 indexMarquette County: 193 indexMason County: 87 indexMissaukee County: 133 indexMuskegon County: 140 indexOakland County: 166 indexOttawa County: 159 indexSt. Clair County: 152 indexSchoolcraft County: 167 indexTuscola County: 112 indexWashtenaw County: 152 indexWayne County: 156 indexWexford County: 93 index
  • Under 110
  • 110 to 140
  • 140 to 150
  • 150 to 160
  • 160 and over
  • No data
Highest daily Air Quality Index (US EPA), 2025, index. Marquette 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/marquette-county-michigan. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/marquette-county-michigan.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/marquette-county-michigan (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025}},
  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/highest-daily-air-quality-index/marquette-county-michigan. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Marquette County, 1980 to 2025
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/highest-daily-air-quality-index/marquette-county-michigan
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/marquette-county-michigan.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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 highest daily Air Quality Index (US EPA) in Marquette County?

Highest daily Air Quality Index (US EPA) in Marquette County was 193 in 2025, according to the U.S. Environmental Protection Agency. That is up 126 from 2024.

Where does this figure come from?

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

What was the highest highest daily Air Quality Index (US EPA) in Marquette County?

193 in 2025, the highest value since 1980 in this series.

Related statistics for Marquette County

All statistics for Marquette County | Marquette County in figures