Air Quality Rankings for Louisiana 2026

Louisiana has 22 cities with EPA air quality data. St. James, Louisiana has the cleanest air with a 5-year average AQI of 30. Calcasieu, Louisiana has the highest AQI at 52.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	St. James, Louisiana	30	33	Ozone	Stable	B
2	Ascension, Louisiana	32	34	Ozone	Stable	B
3	St. John the Baptist, Louisiana	33	35	Ozone	Stable	B
4	Pointe Coupee, Louisiana	33	36	Ozone	Stable	B
5	St. Martin, Louisiana	34	37	Ozone	Improving	B
6	Orleans, Louisiana	36	41	PM2.5	Improving	B
7	Ouachita, Louisiana	36	38	Ozone	Improving	B
8	Terrebonne, Louisiana	38	43	PM2.5	Worsening	C
9	Caddo, Louisiana	38	38	Ozone	Stable	B
10	Rapides, Louisiana	39	43	PM2.5	Improving	B
11	Tangipahoa, Louisiana	39	43	PM2.5	Stable	B
12	St. Tammany, Louisiana	40	42	PM2.5	Improving	B
13	Iberville, Louisiana	40	44	Ozone	Worsening	C
14	Jefferson, Louisiana	44	51	PM2.5	Stable	C
15	Lafayette, Louisiana	45	47	PM2.5	Improving	B
16	Bossier, Louisiana	47	53	PM2.5	Worsening	C
17	West Baton Rouge, Louisiana	47	52	PM2.5	Stable	C
18	Lafourche, Louisiana	48	53	PM2.5	Worsening	C
19	East Baton Rouge, Louisiana	48	52	PM2.5	Improving	B
20	St. Bernard, Louisiana	48	52	PM2.5	Stable	C
21	Livingston, Louisiana	50	54	PM2.5	Stable	C
22	Calcasieu, Louisiana	52	54	PM2.5	Stable	C

Air quality data for Louisiana is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

St. James, Louisiana has the best air quality in Louisiana with a 5-year average AQI of 30 and a grade of B.

Louisiana has 22 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in Louisiana →