Tangipahoa Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in Tangipahoa, Louisiana, 1999–2025.

80%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

122

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Tangipahoa, Louisiana on 122 days. 97 of those days (80%) were in the Good range, and the median daily AQI was 41. 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 fine particles (PM2.5) on 122 days. Across the years with fuller monitoring, the share of Good days rose: an average of 38% in 2002–2006 versus 66% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (122 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

Years with fewer than 120 monitored days (2012, 2015, 2016, 2017, 2019, 2021…) 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
Fine particles (PM2.5)	122	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Median AQI	90th pct.	Max AQI	Main pollutant
2025	122	97	25	0	41	53	64	PM2.5
2024	127	67	60	0	47	62	77	PM2.5
2023	124	81	43	0	43	56	71	PM2.5
2022	124	89	35	0	38	57	97	PM2.5
2021	110	81	29	0	39	58	65	PM2.5
2020	121	88	33	0	34	56	68	PM2.5
2019	117	84	33	0	40	58	68	PM2.5
2018	125	89	36	0	37	58	81	PM2.5
2017	116	76	40	0	41	57	93	PM2.5
2016	117	97	20	0	37	53	65	PM2.5
2015	114	84	30	0	39	57	98	PM2.5
2014	121	81	40	0	40	58	69	PM2.5
2013	123	91	32	0	37	58	81	PM2.5
2012	114	74	40	0	45	60	77	PM2.5
2011	121	71	50	0	47	61	88	PM2.5
2010	115	64	51	0	49	59	71	PM2.5
2009	117	70	47	0	45	60	76	PM2.5
2008	117	57	60	0	51	66	76	PM2.5
2007	119	48	71	0	53	70	90	PM2.5
2006	120	32	88	0	56	78	90	PM2.5
2005	116	39	75	2	57	80	119	PM2.5
2004	119	57	61	1	51	68	106	PM2.5
2003	121	53	68	0	53	66	87	PM2.5
2002	121	54	67	0	52	64	84	PM2.5
2001	110	40	70	0	54	70	96	PM2.5
2000	118	33	83	2	56	79	114	PM2.5
1999	58	15	41	2	60	81	128	PM2.5

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 1999–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem