Air Quality in Louisiana

Louisiana has 22 counties with EPA air quality monitoring. Air quality is stable across the state, with an average of 231 "Good" days per county per year. The best air quality is in St. James (median AQI 32) and the most polluted is East Baton Rouge (median AQI 51).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Ascension	33	151	331	3	→ stable	Ozone
Bossier	47	111	209	3	↑ worsening	PM2.5
Caddo	41	101	273	1	→ stable	Ozone
Calcasieu	49	147	194	4	→ stable	PM2.5
East Baton Rouge	51	154	179	7	→ stable	PM2.5
Iberville	41	159	270	9	→ stable	Ozone
Jefferson	46	188	224	1	→ stable	PM2.5
Lafayette	51	108	180	2	→ stable	PM2.5
Lafourche	48	115	197	1	↑ worsening	PM2.5
Livingston	44	100	235	0	→ stable	PM2.5
Orleans	41	105	257	1	↓ improving	PM2.5
Ouachita	41	97	292	0	→ stable	Ozone
Pointe Coupee	36	101	328	1	→ stable	Ozone
Rapides	39	102	85	1	→ stable	PM2.5
St. Bernard	45	138	241	2	→ stable	Ozone
St. James	32	108	339	3	→ stable	Ozone
St. John the Baptist	36	105	320	2	→ stable	Ozone
St. Martin	38	101	292	1	→ stable	Ozone
St. Tammany	39	186	291	1	→ stable	Ozone
Tangipahoa	47	77	67	0	→ stable	PM2.5
Terrebonne	39	99	85	0	→ stable	PM2.5
West Baton Rouge	49	101	198	2	→ stable	PM2.5