Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Louisiana

Counties in Louisiana by share of days with good air quality (US EPA AQI)

Beauregard Parish had the highest share of days with good air quality (US EPA AQI) of 26 counties in 2000, at 79.2%. East Baton Rouge Parish had the lowest, at 14.8%. The median was 51.3%. Source: EPA.

Keep it in a collection in your library.
Highest79.2Beauregard Parish
Lowest14.8East Baton Rouge Parish
Median51.326 counties

Map of counties, 2000

Ascension Parish: 73.7 %Beauregard Parish: 79.2 %Bossier Parish: 41.3 %Caddo Parish: 55.9 %Calcasieu Parish: 34.7 %Concordia Parish: 36.7 %East Baton Rouge Parish: 14.8 %Grant Parish: 68.5 %Iberville Parish: 60.1 %Jefferson Parish: 29 %Lafayette Parish: 59.2 %Lafourche Parish: 44.1 %Livingston Parish: 47.1 %Orleans Parish: 29.5 %Ouachita Parish: 60.5 %Plaquemines Parish: 33.3 %Pointe Coupee Parish: 77.6 %Rapides Parish: 24.6 %St. Bernard Parish: 55.5 %St. Charles Parish: 76.6 %St. James Parish: 76.3 %St. John the Baptist Parish: 74 %St. Mary Parish: 78.8 %Tangipahoa Parish: 28 %Terrebonne Parish: 35 %West Baton Rouge Parish: 26.2 %
  • Under 30
  • 30 to 41
  • 41 to 59
  • 59 to 74
  • 74 and over
  • No data
%, 2000. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2000

Beauregard Parish: 79.2 %Beauregard Parish79.2St. Mary Parish: 78.8 %St. Mary Parish78.8Pointe Coupee Parish: 77.6 %Pointe Coupee Parish77.6St. Charles Parish: 76.6 %St. Charles Parish76.6St. James Parish: 76.3 %St. James Parish76.3St. John the Baptist Parish: 74 %St. John the Baptist Parish74Ascension Parish: 73.7 %Ascension Parish73.7Grant Parish: 68.5 %Grant Parish68.5Ouachita Parish: 60.5 %Ouachita Parish60.5Iberville Parish: 60.1 %Iberville Parish60.1Lafayette Parish: 59.2 %Lafayette Parish59.2Caddo Parish: 55.9 %Caddo Parish55.9St. Bernard Parish: 55.5 %St. Bernard Parish55.5Livingston Parish: 47.1 %Livingston Parish47.1Lafourche Parish: 44.1 %Lafourche Parish44.1Bossier Parish: 41.3 %Bossier Parish41.3Concordia Parish: 36.7 %Concordia Parish36.7Terrebonne Parish: 35 %Terrebonne Parish35Calcasieu Parish: 34.7 %Calcasieu Parish34.7Plaquemines Parish: 33.3 %Plaquemines Parish33.3Orleans Parish: 29.5 %Orleans Parish29.5Jefferson Parish: 29 %Jefferson Parish29Tangipahoa Parish: 28 %Tangipahoa Parish28West Baton Rouge Parish: 26.2 %West Baton Rouge Parish26.2Rapides Parish: 24.6 %Rapides Parish24.6East Baton Rouge Parish: 14.8 %East Baton Rouge Parish14.8Beauregard Parish: 79.2 %Beauregard Parish79.2St. Mary Parish: 78.8 %St. Mary Parish78.8Pointe Coupee Parish: 77.6 %Pointe Coupee Parish77.6St. Charles Parish: 76.6 %St. Charles Parish76.6St. James Parish: 76.3 %St. James Parish76.3St. John the Baptist Parish: 74 %St. John the Baptist Parish74Ascension Parish: 73.7 %Ascension Parish73.7Grant Parish: 68.5 %Grant Parish68.5Ouachita Parish: 60.5 %Ouachita Parish60.5Iberville Parish: 60.1 %Iberville Parish60.1Lafayette Parish: 59.2 %Lafayette Parish59.2Caddo Parish: 55.9 %Caddo Parish55.9St. Bernard Parish: 55.5 %St. Bernard Parish55.5Livingston Parish: 47.1 %Livingston Parish47.1Lafourche Parish: 44.1 %Lafourche Parish44.1Bossier Parish: 41.3 %Bossier Parish41.3Concordia Parish: 36.7 %Concordia Parish36.7Terrebonne Parish: 35 %Terrebonne Parish35Calcasieu Parish: 34.7 %Calcasieu Parish34.7Plaquemines Parish: 33.3 %Plaquemines Parish33.3Orleans Parish: 29.5 %Orleans Parish29.5Jefferson Parish: 29 %Jefferson Parish29Tangipahoa Parish: 28 %Tangipahoa Parish28West Baton Rouge Parish: 26.2 %West Baton Rouge Parish26.2Rapides Parish: 24.6 %Rapides Parish24.6East Baton Rouge Parish: 14.8 %East Baton Rouge Parish14.8
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2000 (%)Change on 1999
1Beauregard Parish79.2+2.2 pts
2St. Mary Parish78.8+2.9 pts
3Pointe Coupee Parish77.6+1.4 pts
4St. Charles Parish76.6-0.8 pts
5St. James Parish76.3-1.4 pts
6St. John the Baptist Parish74-0.2 pts
7Ascension Parish73.7-10.8 pts
8Grant Parish68.5+3.7 pts
9Ouachita Parish60.5+5.1 pts
10Iberville Parish60.1+2 pts
11Lafayette Parish59.2-0.3 pts
12Caddo Parish55.9+7.5 pts
13St. Bernard Parish55.5-15 pts
14Livingston Parish47.1-23.6 pts
15Lafourche Parish44.1-25.6 pts
16Bossier Parish41.3-27.3 pts
17Concordia Parish36.7+8.9 pts
18Terrebonne Parish35n/a
19Calcasieu Parish34.7-24.2 pts
20Plaquemines Parish33.3n/a
21Orleans Parish29.5-26.1 pts
22Jefferson Parish29+4.1 pts
23Tangipahoa Parish28+2.1 pts
24West Baton Rouge Parish26.2+4.8 pts
25Rapides Parish24.6+6.4 pts
26East Baton Rouge Parish14.8+1.9 pts

Other periods

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 4 counties with data in other periods have no value for 2000 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000) [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: good days as a share of days with an AQI, calculated with stored counts, Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2000. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2000.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2000 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_louisiana_by_2000,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000}},
  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/rankings/good-air-quality-days-share/louisiana-counties?period=2000. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Counties in Louisiana by share of days with good air quality (US EPA AQI), 2000
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/rankings/good-air-quality-days-share/louisiana-counties?period=2000
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2000.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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:

Rank Counties in Louisiana by share of days with good air quality (US EPA AQI) using official data, and cite the source.
rank_places {"indicator":"aqi_good_days_share","level":"province","within":"Louisiana","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=aqi_good_days_share&level=province&within=Louisiana&limit=10

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

Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Beauregard Parish, with 79.2% in 2000, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

East Baton Rouge Parish, with 14.8% in 2000.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 4 counties have no value for 2000 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in Louisiana: more rankings