Bad Air Days in Roane County, Tennessee: under 1 a Year

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 833 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 and July and October and November. 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.

Better or worse than it was

The worst recent year was 2016, with 1 bad day on 117 monitored days.

Date	AQI	Main pollutant
2016-11-08	166	PM2.5
2022-10-21	162	PM2.5
2023-07-17	106	PM2.5
2023-06-29	104	PM2.5
2020-06-27	92	PM2.5

An ordinary day in Roane

Across 3,244 monitored days from 2016 to 2025, the air in Roane County rated Good on 76% of them, more often than the 72% typical of monitored counties, and Moderate on 24%. The median day sat at AQI 36; one day in ten went above 55.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%3,235 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	360	319	41	0	0	29	68
2024	361	285	76	0	0	35	72
2023	357	258	97	2	0	36	106
2022	340	273	66	1	1	36	162
2021	357	256	101	0	0	37	89
2020	338	272	66	0	0	35	92
2019	356	251	105	0	0	37	75
2018	355	267	88	0	0	36	66
2017	303	204	99	0	0	41	73
2016	117	70	46	1	1	42	166
2015	120	64	56	0	0	49	73
2014	281	92	189	0	0	53	85
2013	365	69	295	1	0	58	121
2012	366	54	312	0	0	59	90
2011	365	46	318	1	1	61	168
2010	354	107	247	0	0	57	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.