Bad Air Days in Union County, Arkansas

Not enough data

EPA monitors in Union County ran on too few days between 2016 and 2025 to give a fair yearly count (about 49% of days covered). Neighbouring counties below are a better guide.

What to buy, and what not to

EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.

The worst days on file

The worst recent year was 2023, with 1 bad day on 119 monitored days.

Date	AQI	Main pollutant
2018-07-01	122	PM2.5
2018-07-02	105	PM2.5
2018-08-14	102	PM2.5
2023-08-25	102	PM2.5
2022-06-13	100	PM2.5

The air on a normal day

Across 1,807 monitored days from 2016 to 2025, the air in Union County rated Good on 52% of them, less often than the 72% typical of monitored counties, and Moderate on 48%. The median day sat at AQI 49; one day in ten went above 61.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%1,807 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2025*	122	51	71	0	52	73
2024	121	62	59	0	49	93
2023	119	59	59	1	51	102
2022	115	65	50	0	47	100
2021	116	66	50	0	48	74
2020	121	74	47	0	45	90
2019	241	135	106	0	46	99
2018	365	189	173	3	49	122
2017	365	164	201	0	52	92
2016	122	66	56	0	47	74
2015	119	73	46	0	43	77
2014	121	69	52	0	46	73
2013	120	66	54	0	47	99
2012	114	48	66	0	54	90
2011	116	34	82	0	54	89
2010	120	38	82	0	55	96

*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.