Bad Air Days in Ouachita Parish, Louisiana: under 1 a Year

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 919 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

Which months to watch

Most bad days here fall in June. 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.

The worst days on file

In 2000 to 2009 this county averaged 12 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2022, with 1 bad day on 359 monitored days.

Date	AQI	Main pollutant
2020-06-26	111	PM2.5
2022-06-13	105	PM2.5
2018-07-01	100	PM2.5
2023-05-30	100	Ozone
2022-04-29	97	Ozone

An ordinary day in Ouachita

Across 3,590 monitored days from 2016 to 2025, the air in Ouachita Parish rated Good on 83% of them, more often than the 72% typical of monitored counties, and Moderate on 17%. The median day sat at AQI 37; one day in ten went above 54.

The pollutant setting the AQI on an ordinary day here:

ozone74%2,644 days
fine particles (PM2.5)26%946 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2025*	365	227	138	0	45	80
2024	366	292	74	0	41	97
2023	358	283	75	0	38	100
2022	359	309	49	1	38	105
2021	349	318	31	0	35	87
2020	362	324	37	1	34	111
2019	363	310	53	0	36	71
2018	363	323	40	0	34	100
2017	361	308	53	0	35	83
2016	344	288	56	0	37	75
2015	335	286	49	0	33	74
2014	364	190	174	0	47	88
2013	365	44	320	1	61	120
2012	366	71	295	0	57	92
2011	365	134	231	0	54	100
2010	363	212	148	3	45	101

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

Nearby counties on file

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.