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

Median Air Quality Index (US EPA) in Harrison County

Median Air Quality Index (US EPA) in Harrison County was 43 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024.

2025, index43
Change on 2024-1
Series high602005
Series low432025

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 Harrison County, 1999 to 2025

404550556019992003200720112015201920251999: 57 index2000: 59 index2001: 57 index2002: 53 index2003: 55 index2004: 56 index2005: 60 index2006: 58 index2007: 56 index2008: 54 index2009: 53 index2010: 54 index2011: 53 index2012: 49 index2013: 47 index2014: 50 index2015: 44 index2016: 44 index2017: 44 index2018: 45 index2019: 47 index2020: 49 index2021: 45 index2022: 46 index2023: 51 index2024: 44 index2025: 43 index404550556019992008201720251999: 57 index2000: 59 index2001: 57 index2002: 53 index2003: 55 index2004: 56 index2005: 60 index2006: 58 index2007: 56 index2008: 54 index2009: 53 index2010: 54 index2011: 53 index2012: 49 index2013: 47 index2014: 50 index2015: 44 index2016: 44 index2017: 44 index2018: 45 index2019: 47 index2020: 49 index2021: 45 index2022: 46 index2023: 51 index2024: 44 index2025: 43 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 27 values
Periodindex
202543
202444
202351
202246
202145
202049
201947
201845
201744
201644
201544
201450
201347
201249
201153
201054
200953
200854
200756
200658
200560
200456
200355
200253
200157
200059
199957

Harrison County compared with nearby places

Bolivar County: 43 indexDeSoto County: 43 indexForrest County: 45 indexHancock County: 43 indexHarrison County: 43 indexHinds County: 52 indexJackson County: 44 indexLauderdale County: 35 indexLee County: 38 indexYalobusha County: 34 index
  • Under 37
  • 37 to 43
  • 43 to 44
  • 44 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Harrison 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), Harrison County, 1999 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), Harrison County, 1999 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/harrison-county-mississippi. 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), Harrison County, 1999 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/harrison-county-mississippi.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Harrison County, 1999 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/harrison-county-mississippi (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), Harrison County, 1999 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/harrison-county-mississippi. 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), Harrison County, 1999 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/harrison-county-mississippi
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/harrison-county-mississippi.
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 Harrison County?

Median Air Quality Index (US EPA) in Harrison County was 43 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 Harrison County?

60 in 2005, the highest value since 1999 in this series.

Related statistics for Harrison County

All statistics for Harrison County | Harrison County in figures