Madison County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Madison, Tennessee, 1986–2025.

74%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

354

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Madison, Tennessee on 354 days. 263 of those days (74%) were in the Good range, and the median daily AQI was 36. That median is lower than the typical monitored county in Tennessee (median 39 across 23 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 354 days. Across the years with fuller monitoring, the share of Good days fell: an average of 79% in 1993–1995 versus 74% in 2023–2025.

Years with fewer than 120 monitored days (2010, 2011, 2013, 2014, 2015, 2016…) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median daily AQI
90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

Pollutant	Days as main pollutant	Share of monitored days
Fine particles (PM2.5)	354	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	354	263	91	0	0	36	56	96	PM2.5
2024	357	289	68	0	0	33	54	90	PM2.5
2023	357	237	120	0	0	43	61	87	PM2.5
2022	359	245	113	1	0	41	58	102	PM2.5
2021	356	249	106	1	0	38	60	106	PM2.5
2020	354	304	49	1	0	33	53	108	PM2.5
2019	362	262	100	0	0	36	56	65	PM2.5
2018	351	275	76	0	0	35	56	81	PM2.5
2017	277	216	61	0	0	36	55	69	PM2.5
2016	115	88	27	0	0	37	53	63	PM2.5
2015	110	66	44	0	0	43	58	66	PM2.5
2014	113	67	46	0	0	46	59	81	PM2.5
2013	114	71	43	0	0	44	60	72	PM2.5
2011	54	54	0	0	0	14	23	33	PM10
2010	58	58	0	0	0	15	22	29	PM10
2009	52	52	0	0	0	11	20	32	PM10
2008	50	50	0	0	0	14	22	38	PM10
2007	122	44	74	4	0	54	80	125	PM2.5
2006	127	53	72	1	1	53	69	158	PM2.5
2005	104	64	40	0	0	41	63	81	PM2.5
2004	63	58	5	0	0	18	42	66	PM10
2003	81	51	30	0	0	28	64	78	PM10
2002	131	54	77	0	0	53	73	97	PM2.5
2001	122	39	82	1	0	57	74	135	PM2.5
2000	116	29	87	0	0	58	78	96	PM2.5
1999	105	37	66	2	0	57	82	106	PM2.5
1998	48	48	0	0	0	23	31	41	PM10
1997	57	57	0	0	0	19	32	48	PM10
1996	62	62	0	0	0	19	32	48	PM10
1995	159	139	19	1	0	34	55	112	NO2
1994	365	260	82	16	7	42	87	190	Ozone
1993	233	181	42	9	1	36	77	179	Ozone
1992	59	57	2	0	0	27	39	69	PM10
1991	58	57	1	0	0	25	38	58	PM10
1990	58	54	4	0	0	26	46	68	PM10
1989	61	58	3	0	0	27	44	55	PM10
1988	58	52	6	0	0	28	53	58	PM10
1987	61	55	6	0	0	31	48	66	PM10
1986	31	29	2	0	0	32	48	57	PM10

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Tennessee with a similar median AQI in 2025

All monitored counties in Tennessee

Source: U.S. EPA AirData, “Annual AQI by County” files for 1986–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem