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

Median Air Quality Index (US EPA) in Gratiot County

Median Air Quality Index (US EPA) in Gratiot County was 3 in 1994, according to the U.S. Environmental Protection Agency. That is down 2 from 1993.

1994, index3
Change on 1993-2
Series high51990
Series low31994

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 Gratiot County, 1990 to 1994

33.544.55199019911992199319941990: 5 index1991: 5 index1992: 5 index1993: 5 index1994: 3 index33.544.551990199219941990: 5 index1991: 5 index1992: 5 index1993: 5 index1994: 3 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 5 values
Periodindex
19943
19935
19925
19915
19905

Gratiot County compared with nearby places

Allegan County: 44 indexBenzie County: 43 indexBerrien County: 44 indexCalhoun County: 21 indexCass County: 49 indexCheboygan County: 6 indexClinton County: 43 indexGenesee County: 38 indexGratiot County: 3 indexHuron County: 40 indexIngham County: 40 indexKalamazoo County: 38 indexKent County: 31 indexLenawee County: 47 indexMacomb County: 34 indexManistee County: 35 indexMarquette County: 11 indexMason County: 42 indexMidland County: 24 indexMonroe County: 19 indexMuskegon County: 44 indexOakland County: 24 indexOttawa County: 44 indexSaginaw County: 18 indexSt. Clair County: 42 indexSanilac County: 14 indexTuscola County: 35 indexVan Buren County: 14 indexWashtenaw County: 36 indexWayne County: 48 index
  • Under 17
  • 17 to 29
  • 29 to 37
  • 37 to 42
  • 42 to 44
  • 44 and over
  • No data
Median Air Quality Index (US EPA), 1994, index. Gratiot 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), Gratiot County, 1990 to 1994) [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), Gratiot County, 1990 to 1994. 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/gratiot-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), Gratiot County, 1990 to 1994. 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/gratiot-county-michigan.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Gratiot County, 1990 to 1994 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/gratiot-county-michigan (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_1994,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Gratiot County, 1990 to 1994}},
  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/gratiot-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), Gratiot County, 1990 to 1994
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/gratiot-county-michigan
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/gratiot-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 Gratiot County?

Median Air Quality Index (US EPA) in Gratiot County was 3 in 1994, according to the U.S. Environmental Protection Agency. That is down 2 from 1993.

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 Gratiot County?

5 in 1990, the highest value since 1990 in this series.

Related statistics for Gratiot County

All statistics for Gratiot County | Gratiot County in figures