Bad Air Days in Livingston Parish, Louisiana: 2 a Year

2 bad air days a year

Fewer bad air days than most monitored US counties. Ranked 579 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (33% particle days).

When the bad days come in Livingston

Most bad days here fall in June and August and May and January and April. Averaged over 2016 to 2025.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

Better or worse than it was

In 2000 to 2009 this county averaged 18 bad days a year; in 2016 to 2025, 2. The air has improved. The worst recent year was 2023, with 5 bad days on 364 monitored days.

Date	AQI	Main pollutant
2021-08-07	133	Ozone
2023-08-18	133	Ozone
2023-08-17	129	Ozone
2023-01-01	125	PM2.5
2022-06-13	117	PM2.5

Most days, not the worst ones

Across 3,611 monitored days from 2016 to 2025, the air in Livingston Parish rated Good on 54% of them, less often than the 72% typical of monitored counties, and Moderate on 46%. The median day sat at AQI 48; one day in ten went above 63.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)71%2,561 days
ozone29%1,038 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	363	225	138	0	0	45	90
2024	366	235	131	0	0	44	100
2023	364	134	225	5	0	54	133
2022	361	177	181	3	0	51	117
2021	348	186	161	1	0	48	133
2020	355	206	148	1	0	47	105
2019	365	198	167	0	0	48	97
2018	365	212	153	0	0	46	100
2017	365	204	158	3	0	48	112
2016	359	159	198	2	0	51	112
2015	365	146	217	2	0	53	112
2014	364	136	222	6	0	53	122
2013	365	245	117	3	0	44	129
2012	361	231	125	5	0	44	133
2011	363	206	145	12	0	47	150
2010	365	190	165	10	2	49	192

*2025 may be a partial year in EPA's file.

Elsewhere in Louisiana

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day, and on why a purifier does not touch ozone in smoke vs ozone.