Air Quality in Tennessee

Tennessee has 24 counties with EPA air quality monitoring. Air quality is generally improving across the state, with an average of 244 "Good" days per county per year. The best air quality is in Union (median AQI 11) and the most polluted is Shelby (median AQI 55).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Anderson	41	100	221	0	→ stable	Ozone
Blount	47	90	221	0	→ stable	Ozone
Claiborne	36	67	336	0	→ stable	Ozone
Davidson	50	122	189	6	→ stable	PM2.5
DeKalb	38	77	312	0	→ stable	Ozone
Dyer	31	92	286	0	→ stable	PM2.5
Hamilton	48	126	190	3	→ stable	PM2.5
Jefferson	40	105	222	1	→ stable	Ozone
Knox	48	105	205	1	→ stable	PM2.5
Lawrence	38	84	272	0	→ stable	PM2.5
Loudon	42	100	286	0	→ stable	PM2.5
Madison	33	90	289	0	→ stable	PM2.5
Maury	33	83	297	0	→ stable	PM2.5
McMinn	32	89	281	0	↓ improving	PM2.5
Montgomery	32	79	302	0	↓ improving	PM2.5
Putnam	32	74	302	0	→ stable	PM2.5
Roane	35	72	285	0	↓ improving	PM2.5
Sevier	44	93	289	0	→ stable	Ozone
Shelby	55	159	126	9	→ stable	PM2.5
Sullivan	41	97	285	0	→ stable	Ozone
Sumner	45	133	224	4	→ stable	PM2.5
Union	11	19	20	0	↓ improving	PM10
Williamson	43	87	200	0	→ stable	Ozone
Wilson	41	100	216	0	→ stable	Ozone