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 2002, at 90.8%. East Baton Rouge Parish had the lowest, at 18.4%. The median was 66.1%. Source: EPA.

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Highest90.8Beauregard Parish
Lowest18.4East Baton Rouge Parish
Median66.127 counties

Map of counties, 2002

Ascension Parish: 89.4 %Beauregard Parish: 90.8 %Bossier Parish: 55.3 %Caddo Parish: 66.1 %Calcasieu Parish: 53.7 %Concordia Parish: 41.4 %East Baton Rouge Parish: 18.4 %Grant Parish: 89.5 %Iberville Parish: 66.6 %Jefferson Parish: 43.3 %Lafayette Parish: 72.2 %Lafourche Parish: 64.7 %Livingston Parish: 57.3 %Orleans Parish: 41.5 %Ouachita Parish: 73.1 %Plaquemines Parish: 80.4 %Pointe Coupee Parish: 89.2 %Rapides Parish: 45.5 %St. Bernard Parish: 70.8 %St. Charles Parish: 89.5 %St. James Parish: 90.6 %St. John the Baptist Parish: 89.8 %St. Mary Parish: 89 %Tangipahoa Parish: 44.6 %Terrebonne Parish: 50.8 %West Baton Rouge Parish: 32.9 %Winn Parish: 61.1 %
  • Under 45
  • 45 to 59
  • 59 to 72
  • 72 to 89
  • 89 and over
  • No data
%, 2002. 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, 2002

Beauregard Parish: 90.8 %Beauregard Parish90.8St. James Parish: 90.6 %St. James Parish90.6St. John the Baptist Parish: 89.8 %St. John the Baptist Parish89.8Grant Parish: 89.5 %Grant Parish89.5St. Charles Parish: 89.5 %St. Charles Parish89.5Ascension Parish: 89.4 %Ascension Parish89.4Pointe Coupee Parish: 89.2 %Pointe Coupee Parish89.2St. Mary Parish: 89 %St. Mary Parish89Plaquemines Parish: 80.4 %Plaquemines Parish80.4Ouachita Parish: 73.1 %Ouachita Parish73.1Lafayette Parish: 72.2 %Lafayette Parish72.2St. Bernard Parish: 70.8 %St. Bernard Parish70.8Iberville Parish: 66.6 %Iberville Parish66.6Caddo Parish: 66.1 %Caddo Parish66.1Lafourche Parish: 64.7 %Lafourche Parish64.7Winn Parish: 61.1 %Winn Parish61.1Livingston Parish: 57.3 %Livingston Parish57.3Bossier Parish: 55.3 %Bossier Parish55.3Calcasieu Parish: 53.7 %Calcasieu Parish53.7Terrebonne Parish: 50.8 %Terrebonne Parish50.8Rapides Parish: 45.5 %Rapides Parish45.5Tangipahoa Parish: 44.6 %Tangipahoa Parish44.6Jefferson Parish: 43.3 %Jefferson Parish43.3Orleans Parish: 41.5 %Orleans Parish41.5Concordia Parish: 41.4 %Concordia Parish41.4West Baton Rouge Parish: 32.9 %West Baton Rouge Parish32.9East Baton Rouge Parish: 18.4 %East Baton Rouge Parish18.4Beauregard Parish: 90.8 %Beauregard Parish90.8St. James Parish: 90.6 %St. James Parish90.6St. John the Baptist Parish: 89.8 %St. John the Baptist Parish89.8Grant Parish: 89.5 %Grant Parish89.5St. Charles Parish: 89.5 %St. Charles Parish89.5Ascension Parish: 89.4 %Ascension Parish89.4Pointe Coupee Parish: 89.2 %Pointe Coupee Parish89.2St. Mary Parish: 89 %St. Mary Parish89Plaquemines Parish: 80.4 %Plaquemines Parish80.4Ouachita Parish: 73.1 %Ouachita Parish73.1Lafayette Parish: 72.2 %Lafayette Parish72.2St. Bernard Parish: 70.8 %St. Bernard Parish70.8Iberville Parish: 66.6 %Iberville Parish66.6Caddo Parish: 66.1 %Caddo Parish66.1Lafourche Parish: 64.7 %Lafourche Parish64.7Winn Parish: 61.1 %Winn Parish61.1Livingston Parish: 57.3 %Livingston Parish57.3Bossier Parish: 55.3 %Bossier Parish55.3Calcasieu Parish: 53.7 %Calcasieu Parish53.7Terrebonne Parish: 50.8 %Terrebonne Parish50.8Rapides Parish: 45.5 %Rapides Parish45.5Tangipahoa Parish: 44.6 %Tangipahoa Parish44.6Jefferson Parish: 43.3 %Jefferson Parish43.3Orleans Parish: 41.5 %Orleans Parish41.5Concordia Parish: 41.4 %Concordia Parish41.4West Baton Rouge Parish: 32.9 %West Baton Rouge Parish32.9East Baton Rouge Parish: 18.4 %East Baton Rouge Parish18.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2002 (%)Change on 2001
1Beauregard Parish90.8+6.1 pts
2St. James Parish90.6+2.5 pts
3St. John the Baptist Parish89.8+8.2 pts
4Grant Parish89.5+9.9 pts
4St. Charles Parish89.5+4.4 pts
6Ascension Parish89.4+9.1 pts
7Pointe Coupee Parish89.2-0.5 pts
8St. Mary Parish89+7 pts
9Plaquemines Parish80.4+21.6 pts
10Ouachita Parish73.1+7.3 pts
11Lafayette Parish72.2+3.3 pts
12St. Bernard Parish70.8+1.4 pts
13Iberville Parish66.6+3.3 pts
14Caddo Parish66.1+4 pts
15Lafourche Parish64.7+12.4 pts
16Winn Parish61.1+18.2 pts
17Livingston Parish57.3+12.4 pts
18Bossier Parish55.3+8.3 pts
19Calcasieu Parish53.7+12.6 pts
20Terrebonne Parish50.8+4.3 pts
21Rapides Parish45.5+6 pts
22Tangipahoa Parish44.6+8.2 pts
23Jefferson Parish43.3+5.8 pts
24Orleans Parish41.5+8.6 pts
25Concordia Parish41.4+6 pts
26West Baton Rouge Parish32.9+4.7 pts
27East Baton Rouge Parish18.4-1.9 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. 3 counties with data in other periods have no value for 2002 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), 2002) [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), 2002. 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=2002. 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), 2002. 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=2002.

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), 2002 [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=2002 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_louisiana_by_2002,
  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), 2002}},
  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=2002. 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), 2002
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=2002
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/louisiana-counties?period=2002.
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 90.8% in 2002, according to EPA.

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

East Baton Rouge Parish, with 18.4% in 2002.

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 2002 and are not ranked.

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

Counties in Louisiana: more rankings