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

Median Air Quality Index (US EPA) in Ascension Parish

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

2025, index33
Change on 20240
Series high402005
Series low241984

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

Median Air Quality Index (US EPA) in Ascension Parish, 1983 to 2025

2025303540198319962001200620112016202120251983: 29 index1984: 24 index1993: 35 index1994: 31 index1995: 35 index1996: 34 index1997: 36 index1998: 27 index1999: 26 index2000: 36 index2001: 36 index2002: 32 index2003: 32 index2004: 34 index2005: 40 index2006: 40 index2007: 39 index2008: 36 index2009: 35 index2010: 36 index2011: 35 index2012: 37 index2013: 32 index2014: 34 index2015: 34 index2016: 36 index2017: 34 index2018: 31 index2019: 33 index2020: 31 index2021: 31 index2022: 32 index2023: 34 index2024: 33 index2025: 33 index202530354019832003201520251983: 29 index1984: 24 index1993: 35 index1994: 31 index1995: 35 index1996: 34 index1997: 36 index1998: 27 index1999: 26 index2000: 36 index2001: 36 index2002: 32 index2003: 32 index2004: 34 index2005: 40 index2006: 40 index2007: 39 index2008: 36 index2009: 35 index2010: 36 index2011: 35 index2012: 37 index2013: 32 index2014: 34 index2015: 34 index2016: 36 index2017: 34 index2018: 31 index2019: 33 index2020: 31 index2021: 31 index2022: 32 index2023: 34 index2024: 33 index2025: 33 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 35 values
Periodindex
202533
202433
202334
202232
202131
202031
201933
201831
201734
201636
201534
201434
201332
201237
201135
201036
200935
200836
200739
200640
200540
200434
200332
200232
200136
200036
199926
199827
199736
199634
199535
199431
199335
198424
198329

Ascension 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. Ascension 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.

Report a problem with this figure

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), Ascension 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), Ascension 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/ascension-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), Ascension 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/ascension-parish-louisiana.

Harvard

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

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest median Air Quality Index (US EPA) in Ascension Parish? Cite the source.
get_value {"indicator":"aqi_median","place":"us-county-22005"}
GET https://invokely.ai/api/v1/value?indicator=aqi_median&place=us-county-22005

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the median Air Quality Index (US EPA) in Ascension Parish?

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

40 in 2005, the highest value since 1983 in this series.

Related statistics for Ascension Parish

All statistics for Ascension Parish | Ascension Parish in figures