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 27 counties in 2003, at 87.8%. East Baton Rouge Parish had the lowest, at 21.6%. The median was 58.9%. Source: EPA.

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Highest87.8Beauregard Parish
Lowest21.6East Baton Rouge Parish
Median58.927 counties

Map of counties, 2003

Ascension Parish: 87.6 %Beauregard Parish: 87.8 %Bossier Parish: 35.3 %Caddo Parish: 63.8 %Calcasieu Parish: 33.7 %Concordia Parish: 31 %East Baton Rouge Parish: 21.6 %Grant Parish: 85.9 %Iberville Parish: 58.9 %Jefferson Parish: 36.7 %Lafayette Parish: 62.7 %Lafourche Parish: 47.5 %Livingston Parish: 39.5 %Orleans Parish: 32.1 %Ouachita Parish: 63.3 %Plaquemines Parish: 63.7 %Pointe Coupee Parish: 84.8 %Rapides Parish: 46.4 %St. Bernard Parish: 72.4 %St. Charles Parish: 83 %St. James Parish: 85.2 %St. John the Baptist Parish: 85.1 %St. Mary Parish: 84.2 %Tangipahoa Parish: 43.8 %Terrebonne Parish: 47.5 %West Baton Rouge Parish: 31.2 %Winn Parish: 51.7 %
  • Under 36
  • 36 to 48
  • 48 to 64
  • 64 to 85
  • 85 and over
  • No data
%, 2003. 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, 2003

Beauregard Parish: 87.8 %Beauregard Parish87.8Ascension Parish: 87.6 %Ascension Parish87.6Grant Parish: 85.9 %Grant Parish85.9St. James Parish: 85.2 %St. James Parish85.2St. John the Baptist Parish: 85.1 %St. John the Baptist Parish85.1Pointe Coupee Parish: 84.8 %Pointe Coupee Parish84.8St. Mary Parish: 84.2 %St. Mary Parish84.2St. Charles Parish: 83 %St. Charles Parish83St. Bernard Parish: 72.4 %St. Bernard Parish72.4Caddo Parish: 63.8 %Caddo Parish63.8Plaquemines Parish: 63.7 %Plaquemines Parish63.7Ouachita Parish: 63.3 %Ouachita Parish63.3Lafayette Parish: 62.7 %Lafayette Parish62.7Iberville Parish: 58.9 %Iberville Parish58.9Winn Parish: 51.7 %Winn Parish51.7Lafourche Parish: 47.5 %Lafourche Parish47.5Terrebonne Parish: 47.5 %Terrebonne Parish47.5Rapides Parish: 46.4 %Rapides Parish46.4Tangipahoa Parish: 43.8 %Tangipahoa Parish43.8Livingston Parish: 39.5 %Livingston Parish39.5Jefferson Parish: 36.7 %Jefferson Parish36.7Bossier Parish: 35.3 %Bossier Parish35.3Calcasieu Parish: 33.7 %Calcasieu Parish33.7Orleans Parish: 32.1 %Orleans Parish32.1West Baton Rouge Parish: 31.2 %West Baton Rouge Parish31.2Concordia Parish: 31 %Concordia Parish31East Baton Rouge Parish: 21.6 %East Baton Rouge Parish21.6Beauregard Parish: 87.8 %Beauregard Parish87.8Ascension Parish: 87.6 %Ascension Parish87.6Grant Parish: 85.9 %Grant Parish85.9St. James Parish: 85.2 %St. James Parish85.2St. John the Baptist Parish: 85.1 %St. John the Baptist Parish85.1Pointe Coupee Parish: 84.8 %Pointe Coupee Parish84.8St. Mary Parish: 84.2 %St. Mary Parish84.2St. Charles Parish: 83 %St. Charles Parish83St. Bernard Parish: 72.4 %St. Bernard Parish72.4Caddo Parish: 63.8 %Caddo Parish63.8Plaquemines Parish: 63.7 %Plaquemines Parish63.7Ouachita Parish: 63.3 %Ouachita Parish63.3Lafayette Parish: 62.7 %Lafayette Parish62.7Iberville Parish: 58.9 %Iberville Parish58.9Winn Parish: 51.7 %Winn Parish51.7Lafourche Parish: 47.5 %Lafourche Parish47.5Terrebonne Parish: 47.5 %Terrebonne Parish47.5Rapides Parish: 46.4 %Rapides Parish46.4Tangipahoa Parish: 43.8 %Tangipahoa Parish43.8Livingston Parish: 39.5 %Livingston Parish39.5Jefferson Parish: 36.7 %Jefferson Parish36.7Bossier Parish: 35.3 %Bossier Parish35.3Calcasieu Parish: 33.7 %Calcasieu Parish33.7Orleans Parish: 32.1 %Orleans Parish32.1West Baton Rouge Parish: 31.2 %West Baton Rouge Parish31.2Concordia Parish: 31 %Concordia Parish31East Baton Rouge Parish: 21.6 %East Baton Rouge Parish21.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2003 (%)Change on 2002
1Beauregard Parish87.8-3 pts
2Ascension Parish87.6-1.8 pts
3Grant Parish85.9-3.6 pts
4St. James Parish85.2-5.4 pts
5St. John the Baptist Parish85.1-4.7 pts
6Pointe Coupee Parish84.8-4.4 pts
7St. Mary Parish84.2-4.8 pts
8St. Charles Parish83-6.5 pts
9St. Bernard Parish72.4+1.6 pts
10Caddo Parish63.8-2.3 pts
11Plaquemines Parish63.7-16.7 pts
12Ouachita Parish63.3-9.8 pts
13Lafayette Parish62.7-9.5 pts
14Iberville Parish58.9-7.7 pts
15Winn Parish51.7-9.4 pts
16Lafourche Parish47.5-17.2 pts
16Terrebonne Parish47.5-3.3 pts
18Rapides Parish46.4+0.9 pts
19Tangipahoa Parish43.8-0.8 pts
20Livingston Parish39.5-17.8 pts
21Jefferson Parish36.7-6.6 pts
22Bossier Parish35.3-20 pts
23Calcasieu Parish33.7-20 pts
24Orleans Parish32.1-9.4 pts
25West Baton Rouge Parish31.2-1.7 pts
26Concordia Parish31-10.4 pts
27East Baton Rouge Parish21.6+3.2 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 2003 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), 2003) [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), 2003. 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=2003. 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), 2003. 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=2003.

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), 2003 [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=2003 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_louisiana_by_2003,
  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), 2003}},
  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=2003. 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), 2003
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=2003
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2003.
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)?

Beauregard Parish, with 87.8% in 2003, according to EPA.

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

East Baton Rouge Parish, with 21.6% in 2003.

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 2003 and are not ranked.

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

Counties in Louisiana: more rankings