Bad Air Days in Wilson County, Tennessee: 1 a Year

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 664 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (0% particle days).

When the bad days come in Wilson

Most bad days here fall in June and April. 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 record for Wilson

In 2000 to 2009 this county averaged 31 bad days a year; in 2016 to 2025, 1. The air has improved. The worst recent year was 2023, with 4 bad days on 244 monitored days.

Date	AQI	Main pollutant
2023-06-06	126	Ozone
2022-06-21	122	Ozone
2018-06-06	119	Ozone
2018-06-08	108	Ozone
2023-06-09	105	Ozone

The air on a normal day

Across 2,345 monitored days from 2016 to 2025, the air in Wilson County rated Good on 90% of them, more often than the 72% typical of monitored counties, and Moderate on 10%. The median day sat at AQI 39; one day in ten went above 51.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,345 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	243	227	16	0	0	38	77
2024	245	216	29	0	0	41	100
2023	244	211	29	4	0	42	126
2022	242	221	20	1	0	39	122
2021	243	221	22	0	0	37	74
2020	245	240	5	0	0	33	64
2019	231	205	26	0	0	40	80
2018	191	158	31	2	0	38	119
2017	236	218	18	0	0	39	84
2016	225	186	39	0	0	41	97
2015	244	211	33	0	0	38	93
2014	238	214	24	0	0	39	87
2013	239	217	22	0	0	39	77
2012	238	166	56	16	2	44	187
2011	243	154	82	7	0	47	133
2010	238	153	76	9	0	46	126

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

Tennessee compared

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, and on why a purifier does not touch ozone in smoke vs ozone.