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

Median Air Quality Index (US EPA) in Ingham County

Median Air Quality Index (US EPA) in Ingham County was 38 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024.

2025, index38
Change on 2024-1
Series high522005
Series low311982

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 Ingham County, 1980 to 2025

30354045505519801987199420012008201520251980: 43 index1981: 32 index1982: 31 index1983: 40 index1984: 36 index1985: 34 index1986: 31 index1987: 33 index1988: 36 index1989: 40 index1990: 39 index1991: 40 index1992: 36 index1993: 39 index1994: 40 index1995: 42 index1996: 42 index1997: 39 index1998: 48 index1999: 48 index2000: 47 index2001: 42 index2002: 51 index2003: 50 index2004: 41 index2005: 52 index2006: 47 index2007: 48 index2008: 44 index2009: 43 index2010: 40 index2011: 36 index2012: 38 index2013: 38 index2014: 48 index2015: 47 index2016: 43 index2017: 42 index2018: 43 index2019: 40 index2020: 37 index2021: 46 index2022: 43 index2023: 43 index2024: 39 index2025: 38 index3040506019801996201220251980: 43 index1981: 32 index1982: 31 index1983: 40 index1984: 36 index1985: 34 index1986: 31 index1987: 33 index1988: 36 index1989: 40 index1990: 39 index1991: 40 index1992: 36 index1993: 39 index1994: 40 index1995: 42 index1996: 42 index1997: 39 index1998: 48 index1999: 48 index2000: 47 index2001: 42 index2002: 51 index2003: 50 index2004: 41 index2005: 52 index2006: 47 index2007: 48 index2008: 44 index2009: 43 index2010: 40 index2011: 36 index2012: 38 index2013: 38 index2014: 48 index2015: 47 index2016: 43 index2017: 42 index2018: 43 index2019: 40 index2020: 37 index2021: 46 index2022: 43 index2023: 43 index2024: 39 index2025: 38 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202538
202439
202343
202243
202146
202037
201940
201843
201742
201643
201547
201448
201338
201238
201136
201040
200943
200844
200748
200647
200552
200441
200350
200251
200142
200047
199948
199848
199739
199642
199542
199440
199339
199236
199140
199039
198940
198836
198733
198631
198534
198436
198340
198231
198132
198043

Ingham County compared with nearby places

Allegan County: 44 indexBay County: 39 indexBenzie County: 35 indexBerrien County: 41 indexCass County: 40 indexClinton County: 39 indexGenesee County: 38 indexHuron County: 38 indexIngham County: 38 indexKalamazoo County: 43 indexKent County: 52 indexKeweenaw County: 8 indexLenawee County: 41 indexMacomb County: 40 indexManistee County: 33 indexMarquette County: 19 indexMason County: 36 indexMissaukee County: 35 indexMuskegon County: 39 indexOakland County: 41 indexOttawa County: 40 indexSt. Clair County: 39 indexSchoolcraft County: 33 indexTuscola County: 35 indexWashtenaw County: 41 indexWayne County: 54 indexWexford County: 36 index
  • Under 35
  • 35 to 38
  • 38 to 40
  • 40 to 41
  • 41 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Ingham 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), Ingham 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: median daily AQI, Median Air Quality Index (US EPA), Ingham 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/median-air-quality-index/ingham-county-michigan. 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), Ingham 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/median-air-quality-index/ingham-county-michigan.

Harvard

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

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Ingham 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/median-air-quality-index/ingham-county-michigan. 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), Ingham 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/median-air-quality-index/ingham-county-michigan
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/ingham-county-michigan.
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 Ingham County?

Median Air Quality Index (US EPA) in Ingham County was 38 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024.

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 Ingham County?

52 in 2005, the highest value since 1980 in this series.

Related statistics for Ingham County

All statistics for Ingham County | Ingham County in figures