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

Median Air Quality Index (US EPA) in Ohio County

Median Air Quality Index (US EPA) in Ohio County was 48 in 2010, according to the U.S. Environmental Protection Agency. That is down 3 from 2009.

2010, index48
Change on 2009-3
Series high532007
Series low191980

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 Ohio County, 1980 to 2010

102030405060198019822005200720101980: 19 index1981: 23 index1982: 39 index1983: 50 index2005: 47 index2006: 46 index2007: 53 index2008: 47 index2009: 51 index2010: 48 index1020304050601980200520101980: 19 index1981: 23 index1982: 39 index1983: 50 index2005: 47 index2006: 46 index2007: 53 index2008: 47 index2009: 51 index2010: 48 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 10 values
Periodindex
201048
200951
200847
200753
200646
200547
198350
198239
198123
198019

Ohio County compared with nearby places

Bell County: 48 indexBoone County: 42 indexBoyd County: 52 indexBullitt County: 54 indexCampbell County: 52 indexCarter County: 47 indexChristian County: 51 indexDaviess County: 57 indexEdmonson County: 44 indexFayette County: 53 indexFranklin County: 55 indexGreenup County: 43 indexHancock County: 46 indexHardin County: 53 indexHenderson County: 52 indexJefferson County: 45 indexJessamine County: 46 indexKenton County: 50 indexLivingston County: 43 indexMcCracken County: 51 indexMadison County: 53 indexMarshall County: 16 indexMorgan County: 41 indexOhio County: 48 indexOldham County: 48 indexPerry County: 46 indexPike County: 47 indexPulaski County: 44 indexSimpson County: 46 indexTrigg County: 45 indexWarren County: 51 indexWashington County: 41 index
  • Under 43
  • 43 to 46
  • 46 to 48
  • 48 to 51
  • 51 to 53
  • 53 and over
  • No data
Median Air Quality Index (US EPA), 2010, index. Ohio 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), Ohio County, 1980 to 2010) [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), Ohio County, 1980 to 2010. 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/ohio-county-kentucky. 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), Ohio County, 1980 to 2010. 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/ohio-county-kentucky.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Ohio County, 1980 to 2010 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/ohio-county-kentucky (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2010,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Ohio County, 1980 to 2010}},
  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/ohio-county-kentucky. 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), Ohio County, 1980 to 2010
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/ohio-county-kentucky
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/ohio-county-kentucky.
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 Ohio County?

Median Air Quality Index (US EPA) in Ohio County was 48 in 2010, according to the U.S. Environmental Protection Agency. That is down 3 from 2009.

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 Ohio County?

53 in 2007, the highest value since 1980 in this series.

Related statistics for Ohio County

All statistics for Ohio County | Ohio County in figures