Data / Median Air Quality Index (US EPA) / St. James Parish

Median Air Quality Index (US EPA) in St. James Parish

Median Air Quality Index (US EPA) in St. James Parish was 33 in 2025, according to the U.S. Environmental Protection Agency. That is up 1 from 2024.

2025, index33
Change on 2024+1
Series high371999
Series low251992

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 St. James Parish, 1983 to 2025

2527.53032.53537.519831992199820042010201620251983: 30 index1984: 26 index1988: 31 index1989: 31 index1990: 33 index1991: 28 index1992: 25 index1993: 31 index1994: 34 index1995: 36 index1996: 34 index1997: 35 index1998: 34 index1999: 37 index2000: 36 index2001: 31 index2002: 31 index2003: 32 index2004: 31 index2005: 37 index2006: 37 index2007: 35 index2008: 33 index2009: 34 index2010: 37 index2011: 36 index2012: 33 index2013: 32 index2014: 33 index2015: 31 index2016: 31 index2017: 31 index2018: 27 index2019: 29 index2020: 29 index2021: 28 index2022: 32 index2023: 33 index2024: 32 index2025: 33 index2530354019832000201420251983: 30 index1984: 26 index1988: 31 index1989: 31 index1990: 33 index1991: 28 index1992: 25 index1993: 31 index1994: 34 index1995: 36 index1996: 34 index1997: 35 index1998: 34 index1999: 37 index2000: 36 index2001: 31 index2002: 31 index2003: 32 index2004: 31 index2005: 37 index2006: 37 index2007: 35 index2008: 33 index2009: 34 index2010: 37 index2011: 36 index2012: 33 index2013: 32 index2014: 33 index2015: 31 index2016: 31 index2017: 31 index2018: 27 index2019: 29 index2020: 29 index2021: 28 index2022: 32 index2023: 33 index2024: 32 index2025: 33 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 40 values
Periodindex
202533
202432
202333
202232
202128
202029
201929
201827
201731
201631
201531
201433
201332
201233
201136
201037
200934
200833
200735
200637
200537
200431
200332
200231
200131
200036
199937
199834
199735
199634
199536
199434
199331
199225
199128
199033
198931
198831
198426
198330

St. James 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. St. James 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), St. James Parish, 1983 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), St. James Parish, 1983 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/st-james-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), St. James Parish, 1983 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/st-james-parish-louisiana.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), St. James Parish, 1983 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/st-james-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), St. James Parish, 1983 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/st-james-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), St. James Parish, 1983 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/st-james-parish-louisiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/st-james-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 St. James Parish?

Median Air Quality Index (US EPA) in St. James Parish was 33 in 2025, according to the U.S. Environmental Protection Agency. That is up 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 St. James Parish?

37 in 1999, the highest value since 1983 in this series.

Related statistics for St. James Parish

All statistics for St. James Parish | St. James Parish in figures