Bossier Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in Bossier, Louisiana, 1980–2025.

79%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

365

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Bossier, Louisiana on 365 days. 288 of those days (79%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in Louisiana (median 42 across 21 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 225 days. Across the years with fuller monitoring, the share of Good days fell: an average of 79% in 1981–1983 versus 59% in 2023–2025.

Years with fewer than 120 monitored days (1980) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median daily AQI
90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

Pollutant	Days as main pollutant	Share of monitored days
Ozone	225	62%
Fine particles (PM2.5)	136	37%
Coarse particles (PM10)	4	1%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Very Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	365	288	76	1	0	0	42	57	101	Ozone
2024	364	209	152	3	0	0	47	64	111	PM2.5
2023	360	148	211	1	0	0	53	67	114	PM2.5
2022	358	162	196	0	0	0	52	64	99	PM2.5
2021	365	172	193	0	0	0	51	64	88	PM2.5
2020	362	269	92	1	0	0	40	58	105	PM2.5
2019	357	282	75	0	0	0	37	55	86	PM2.5
2018	365	280	85	0	0	0	38	63	96	Ozone
2017	364	256	108	0	0	0	42	60	100	Ozone
2016	366	226	140	0	0	0	44	61	90	PM2.5
2015	364	206	157	1	0	0	46	66	140	PM2.5
2014	364	177	186	1	0	0	51	65	112	PM2.5
2013	365	195	167	3	0	0	49	66	119	PM2.5
2012	365	198	163	4	0	0	48	67	140	PM2.5
2011	365	170	167	24	4	0	52	87	159	Ozone
2010	364	167	182	13	2	0	52	80	161	PM2.5
2009	364	212	145	6	1	0	46	66	177	PM2.5
2008	366	193	171	2	0	0	49	67	129	PM2.5
2007	364	161	191	11	1	0	52	76	154	PM2.5
2006	365	144	195	24	2	0	53	90	159	PM2.5
2005	364	139	206	18	1	0	54	84	161	PM2.5
2004	366	175	188	3	0	0	51	71	143	PM2.5
2003	365	129	221	14	1	0	55	78	166	PM2.5
2002	365	202	154	9	0	0	48	78	133	PM2.5
2001	364	171	166	25	2	0	52	93	166	PM2.5
2000	366	151	187	20	7	1	53	93	201	PM2.5
1999	363	249	75	33	6	0	42	105	185	Ozone
1998	364	240	84	33	7	0	41	101	185	Ozone
1997	362	265	74	22	1	0	38	87	159	Ozone
1996	362	292	59	10	1	0	39	71	161	Ozone
1995	363	288	61	14	0	0	36	77	129	Ozone
1994	360	284	60	16	0	0	37	77	150	Ozone
1993	363	295	43	19	6	0	36	84	197	Ozone
1992	342	258	69	11	4	0	41	80	174	Ozone
1991	355	297	49	9	0	0	35	67	133	Ozone
1990	360	256	68	27	9	0	40	101	200	Ozone
1989	354	272	59	21	2	0	36	80	182	Ozone
1988	361	240	75	40	6	0	42	112	179	Ozone
1987	355	227	73	47	8	0	42	112	172	Ozone
1986	351	269	58	23	1	0	37	90	177	Ozone
1985	342	268	57	13	4	0	36	80	192	Ozone
1984	356	314	37	5	0	0	27	58	126	Ozone
1983	321	288	28	5	0	0	27	51	115	Ozone
1982	344	278	50	14	2	0	34	77	174	Ozone
1981	326	214	71	35	6	0	43	108	182	Ozone
1980	53	46	3	1	2	1	32	67	210	Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Louisiana with a similar median AQI in 2025

All monitored counties in Louisiana

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem