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

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 648 of 996 monitored counties, where 1 is worst.

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

Which months to watch

Most bad days here fall in June and May. Averaged over 2016 to 2025.

Is a purifier worth it 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 Sevier

In 2000 to 2009 this county averaged 49 bad days a year; in 2016 to 2025, 1. The air has improved. The worst recent year was 2023, with 3 bad days on 268 monitored days.

Date	AQI	Main pollutant
2018-05-02	115	Ozone
2018-05-03	115	Ozone
2018-06-07	115	Ozone
2023-06-17	115	Ozone
2016-06-11	112	Ozone

An ordinary day in Sevier

Across 3,479 monitored days from 2016 to 2025, the air in Sevier County rated Good on 85% of them, more often than the 72% typical of monitored counties, and Moderate on 15%. The median day sat at AQI 43; one day in ten went above 57.

The pollutant setting the AQI on an ordinary day here:

ozone100%3,479 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	363	351	12	0	0	40	84
2024	362	289	73	0	0	44	93
2023	268	205	60	3	0	45	115
2022	310	262	48	0	0	44	93
2021	363	310	53	0	0	42	93
2020	363	336	26	1	0	40	105
2019	364	287	77	0	0	44	90
2018	364	306	54	4	0	43	115
2017	364	301	63	0	0	44	90
2016	358	297	58	3	0	44	112
2015	364	302	61	1	0	43	112
2014	358	282	76	0	0	44	97
2013	364	299	65	0	0	44	100
2012	365	238	122	5	2	46	154
2011	363	192	148	23	1	50	151
2010	363	183	153	27	0	50	147

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

Elsewhere in Tennessee

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.