Beauregard Parish, Louisiana air quality history

Daily Air Quality Index summaries from EPA monitors in Beauregard, Louisiana, 1983–2005.

82%

Good days in 2005

Median daily AQI, 2005

Days above 100 in 2005

364

Days with an AQI in 2005 (of 365)

In 2005, EPA reported a daily Air Quality Index (AQI) for Beauregard, Louisiana on 364 days. 299 of those days (82%) were in the Good range, and the median daily AQI was 40. That median is lower than the typical monitored county in Louisiana (median 48 across 23 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 364 days. Across the years with fuller monitoring, the share of Good days fell: an average of 88% in 1989–1991 versus 86% in 2003–2005.

The most recent year with data for this county is 2005; EPA's files for 2006–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1983) 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, 2005

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	364	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2005	364	299	59	6	0	40	64	122	Ozone
2004	366	317	42	7	0	35	61	133	Ozone
2003	361	317	35	9	0	33	54	147	Ozone
2002	357	324	31	2	0	34	49	122	Ozone
2001	365	309	50	6	0	36	61	147	Ozone
2000	361	286	55	17	3	37	80	169	Ozone
1999	365	281	65	18	1	39	84	151	Ozone
1998	363	287	59	15	2	35	77	154	Ozone
1997	364	288	64	10	2	36	74	159	Ozone
1996	363	325	36	2	0	33	51	101	Ozone
1995	363	302	50	10	1	36	64	182	Ozone
1994	362	300	48	12	2	34	71	166	Ozone
1993	365	347	17	0	1	30	48	177	Ozone
1992	360	319	33	7	1	33	54	182	Ozone
1991	364	342	16	5	1	30	46	169	Ozone
1990	361	296	52	10	3	36	67	161	Ozone
1989	248	220	24	4	0	33	51	133	Ozone
1983	117	105	11	1	0	31	51	143	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 2005

All monitored counties in Louisiana

Source: U.S. EPA AirData, “Annual AQI by County” files for 1983–2005 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem