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)

Pointe Coupee Parish had the highest share of days with good air quality (US EPA AQI) of 27 counties in 2001, at 89.7%. East Baton Rouge Parish had the lowest, at 20.3%. The median was 58.8%. Source: EPA.

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Highest89.7Pointe Coupee Parish
Lowest20.3East Baton Rouge Parish
Median58.827 counties

Map of counties, 2001

Ascension Parish: 80.3 %Beauregard Parish: 84.7 %Bossier Parish: 47 %Caddo Parish: 62.1 %Calcasieu Parish: 41.1 %Concordia Parish: 35.4 %East Baton Rouge Parish: 20.3 %Grant Parish: 79.6 %Iberville Parish: 63.3 %Jefferson Parish: 37.5 %Lafayette Parish: 68.9 %Lafourche Parish: 52.3 %Livingston Parish: 44.9 %Orleans Parish: 32.9 %Ouachita Parish: 65.8 %Plaquemines Parish: 58.8 %Pointe Coupee Parish: 89.7 %Rapides Parish: 39.5 %St. Bernard Parish: 69.4 %St. Charles Parish: 85.1 %St. James Parish: 88.1 %St. John the Baptist Parish: 81.6 %St. Mary Parish: 82 %Tangipahoa Parish: 36.4 %Terrebonne Parish: 46.5 %West Baton Rouge Parish: 28.2 %Winn Parish: 42.9 %
  • Under 38
  • 38 to 47
  • 47 to 65
  • 65 to 81
  • 81 and over
  • No data
%, 2001. 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, 2001

Pointe Coupee Parish: 89.7 %Pointe Coupee Parish89.7St. James Parish: 88.1 %St. James Parish88.1St. Charles Parish: 85.1 %St. Charles Parish85.1Beauregard Parish: 84.7 %Beauregard Parish84.7St. Mary Parish: 82 %St. Mary Parish82St. John the Baptist Parish: 81.6 %St. John the Baptist Parish81.6Ascension Parish: 80.3 %Ascension Parish80.3Grant Parish: 79.6 %Grant Parish79.6St. Bernard Parish: 69.4 %St. Bernard Parish69.4Lafayette Parish: 68.9 %Lafayette Parish68.9Ouachita Parish: 65.8 %Ouachita Parish65.8Iberville Parish: 63.3 %Iberville Parish63.3Caddo Parish: 62.1 %Caddo Parish62.1Plaquemines Parish: 58.8 %Plaquemines Parish58.8Lafourche Parish: 52.3 %Lafourche Parish52.3Bossier Parish: 47 %Bossier Parish47Terrebonne Parish: 46.5 %Terrebonne Parish46.5Livingston Parish: 44.9 %Livingston Parish44.9Winn Parish: 42.9 %Winn Parish42.9Calcasieu Parish: 41.1 %Calcasieu Parish41.1Rapides Parish: 39.5 %Rapides Parish39.5Jefferson Parish: 37.5 %Jefferson Parish37.5Tangipahoa Parish: 36.4 %Tangipahoa Parish36.4Concordia Parish: 35.4 %Concordia Parish35.4Orleans Parish: 32.9 %Orleans Parish32.9West Baton Rouge Parish: 28.2 %West Baton Rouge Parish28.2East Baton Rouge Parish: 20.3 %East Baton Rouge Parish20.3Pointe Coupee Parish: 89.7 %Pointe Coupee Parish89.7St. James Parish: 88.1 %St. James Parish88.1St. Charles Parish: 85.1 %St. Charles Parish85.1Beauregard Parish: 84.7 %Beauregard Parish84.7St. Mary Parish: 82 %St. Mary Parish82St. John the Baptist Parish: 81.6 %St. John the Baptist Parish81.6Ascension Parish: 80.3 %Ascension Parish80.3Grant Parish: 79.6 %Grant Parish79.6St. Bernard Parish: 69.4 %St. Bernard Parish69.4Lafayette Parish: 68.9 %Lafayette Parish68.9Ouachita Parish: 65.8 %Ouachita Parish65.8Iberville Parish: 63.3 %Iberville Parish63.3Caddo Parish: 62.1 %Caddo Parish62.1Plaquemines Parish: 58.8 %Plaquemines Parish58.8Lafourche Parish: 52.3 %Lafourche Parish52.3Bossier Parish: 47 %Bossier Parish47Terrebonne Parish: 46.5 %Terrebonne Parish46.5Livingston Parish: 44.9 %Livingston Parish44.9Winn Parish: 42.9 %Winn Parish42.9Calcasieu Parish: 41.1 %Calcasieu Parish41.1Rapides Parish: 39.5 %Rapides Parish39.5Jefferson Parish: 37.5 %Jefferson Parish37.5Tangipahoa Parish: 36.4 %Tangipahoa Parish36.4Concordia Parish: 35.4 %Concordia Parish35.4Orleans Parish: 32.9 %Orleans Parish32.9West Baton Rouge Parish: 28.2 %West Baton Rouge Parish28.2East Baton Rouge Parish: 20.3 %East Baton Rouge Parish20.3
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2001 (%)Change on 2000
1Pointe Coupee Parish89.7+12.1 pts
2St. James Parish88.1+11.8 pts
3St. Charles Parish85.1+8.5 pts
4Beauregard Parish84.7+5.5 pts
5St. Mary Parish82+3.2 pts
6St. John the Baptist Parish81.6+7.6 pts
7Ascension Parish80.3+6.6 pts
8Grant Parish79.6+11.1 pts
9St. Bernard Parish69.4+13.9 pts
10Lafayette Parish68.9+9.7 pts
11Ouachita Parish65.8+5.3 pts
12Iberville Parish63.3+3.2 pts
13Caddo Parish62.1+6.2 pts
14Plaquemines Parish58.8+25.5 pts
15Lafourche Parish52.3+8.2 pts
16Bossier Parish47+5.7 pts
17Terrebonne Parish46.5+11.5 pts
18Livingston Parish44.9-2.2 pts
19Winn Parish42.9n/a
20Calcasieu Parish41.1+6.4 pts
21Rapides Parish39.5+14.9 pts
22Jefferson Parish37.5+8.5 pts
23Tangipahoa Parish36.4+8.4 pts
24Concordia Parish35.4-1.3 pts
25Orleans Parish32.9+3.4 pts
26West Baton Rouge Parish28.2+2 pts
27East Baton Rouge Parish20.3+5.5 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. 3 counties with data in other periods have no value for 2001 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), 2001) [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), 2001. 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=2001. 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), 2001. 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=2001.

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), 2001 [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=2001 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_louisiana_by_2001,
  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), 2001}},
  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=2001. 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), 2001
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=2001
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2001.
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  -
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Questions

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

Pointe Coupee Parish, with 89.7% in 2001, according to EPA.

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

East Baton Rouge Parish, with 20.3% in 2001.

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. 3 counties have no value for 2001 and are not ranked.

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

Counties in Louisiana: more rankings