Data / Median Air Quality Index (US EPA) / Ouachita Parish

Median Air Quality Index (US EPA) in Ouachita Parish

Median Air Quality Index (US EPA) in Ouachita Parish was 45 in 2025, according to the U.S. Environmental Protection Agency. That is up 4 from 2024.

2025, index45
Change on 2024+4
Series high612013
Series low191991

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 Ouachita Parish, 1981 to 2025

1020304050607019811988199520022009201620251981: 43 index1982: 31 index1983: 30 index1984: 28 index1985: 35 index1986: 35 index1987: 38 index1988: 40 index1989: 22 index1990: 25 index1991: 19 index1992: 37 index1993: 35 index1994: 38 index1995: 39 index1996: 42 index1997: 35 index1998: 36 index1999: 46 index2000: 44 index2001: 42 index2002: 39 index2003: 44 index2004: 40 index2005: 46 index2006: 43 index2007: 38 index2008: 34 index2009: 35 index2010: 45 index2011: 54 index2012: 57 index2013: 61 index2014: 47 index2015: 33 index2016: 37 index2017: 35 index2018: 34 index2019: 36 index2020: 34 index2021: 35 index2022: 38 index2023: 38 index2024: 41 index2025: 45 index02040608019811996201120251981: 43 index1982: 31 index1983: 30 index1984: 28 index1985: 35 index1986: 35 index1987: 38 index1988: 40 index1989: 22 index1990: 25 index1991: 19 index1992: 37 index1993: 35 index1994: 38 index1995: 39 index1996: 42 index1997: 35 index1998: 36 index1999: 46 index2000: 44 index2001: 42 index2002: 39 index2003: 44 index2004: 40 index2005: 46 index2006: 43 index2007: 38 index2008: 34 index2009: 35 index2010: 45 index2011: 54 index2012: 57 index2013: 61 index2014: 47 index2015: 33 index2016: 37 index2017: 35 index2018: 34 index2019: 36 index2020: 34 index2021: 35 index2022: 38 index2023: 38 index2024: 41 index2025: 45 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 45 values
Periodindex
202545
202441
202338
202238
202135
202034
201936
201834
201735
201637
201533
201447
201361
201257
201154
201045
200935
200834
200738
200643
200546
200440
200344
200239
200142
200044
199946
199836
199735
199642
199539
199438
199335
199237
199119
199025
198922
198840
198738
198635
198535
198428
198330
198231
198143

Ouachita Parish compared with nearby places

Ascension Parish: 33 indexBossier Parish: 42 indexCaddo Parish: 38 indexCalcasieu Parish: 47 indexEast Baton Rouge Parish: 51 indexIberville Parish: 40 indexJefferson Parish: 47 indexLafayette Parish: 45 indexLafourche Parish: 44 indexLivingston Parish: 45 indexOrleans Parish: 42 indexOuachita Parish: 45 indexPointe Coupee Parish: 35 indexRapides Parish: 37 indexSt. Bernard Parish: 44 indexSt. James Parish: 33 indexSt. John the Baptist Parish: 34 indexSt. Martin Parish: 36 indexSt. Tammany Parish: 37 indexTangipahoa Parish: 41 indexTerrebonne Parish: 42 indexWest Baton Rouge Parish: 51 index
  • Under 36
  • 36 to 40
  • 40 to 43
  • 43 to 45
  • 45 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Ouachita Parish 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), Ouachita Parish, 1981 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), Ouachita Parish, 1981 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/ouachita-parish-louisiana. 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), Ouachita Parish, 1981 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/ouachita-parish-louisiana.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Ouachita Parish, 1981 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/ouachita-parish-louisiana (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), Ouachita Parish, 1981 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/ouachita-parish-louisiana. 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), Ouachita Parish, 1981 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/ouachita-parish-louisiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/ouachita-parish-louisiana.
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 Ouachita Parish?

Median Air Quality Index (US EPA) in Ouachita Parish was 45 in 2025, according to the U.S. Environmental Protection Agency. That is up 4 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 Ouachita Parish?

61 in 2013, the highest value since 1981 in this series.

Related statistics for Ouachita Parish

All statistics for Ouachita Parish | Ouachita Parish in figures