Bradley County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Bradley, Tennessee, 1983–2012.

100%

Good days in 2012

Median daily AQI, 2012

Days above 100 in 2012

238

Days with an AQI in 2012 (of 366)

In 2012, EPA reported a daily Air Quality Index (AQI) for Bradley, Tennessee on 238 days. 238 of those days (100%) were in the Good range, and the median daily AQI was 12. That median is lower than the typical monitored county in Tennessee (median 44 across 21 counties), and lower than the typical monitored U.S. county (44). The main pollutant was nitrogen dioxide (NO₂) on 184 days. Across the years with fuller monitoring, the share of Good days rose: an average of 64% in 1983–1985 versus 100% in 2010–2012.

EPA did not report an AQI for every day of 2012 here (238 of 366 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2012; EPA's files for 2013–2025 contain no row for it, which usually means its monitors stopped reporting.

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, 2012

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
Nitrogen dioxide (NO₂)	184	77%
Coarse particles (PM10)	54	23%

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
2012	238	238	0	0	0	12	23	35	NO2
2011	362	362	0	0	0	13	21	40	NO2
2010	282	282	0	0	0	16	25	49	NO2
2009	323	323	0	0	0	11	22	35	NO2
2008	358	358	0	0	0	17	25	36	NO2
2007	364	364	0	0	0	21	32	46	NO2
2006	364	362	2	0	0	21	30	87	NO2
2005	356	352	4	0	0	23	33	64	NO2
2004	340	337	3	0	0	22	33	62	NO2
2003	303	303	0	0	0	22	34	50	NO2
2002	364	362	2	0	0	26	37	73	NO2
2001	364	356	8	0	0	25	39	89	NO2
2000	352	338	13	1	0	25	39	110	NO2
1999	356	349	7	0	0	29	42	79	NO2
1998	362	345	16	1	0	27	44	115	NO2
1997	363	258	67	35	3	38	101	166	Ozone
1996	351	347	4	0	0	25	35	83	NO2
1995	362	354	8	0	0	26	39	77	NO2
1994	365	264	76	22	3	40	87	182	Ozone
1993	334	329	5	0	0	25	39	90	NO2
1992	334	333	1	0	0	21	34	57	NO2
1991	365	358	7	0	0	23	35	62	NO2
1990	359	352	7	0	0	23	38	71	NO2
1989	364	356	8	0	0	24	40	60	NO2
1988	363	343	20	0	0	28	45	80	NO2
1987	330	319	11	0	0	27	40	73	NO2
1986	354	340	10	3	1	26	42	159	NO2
1985	271	168	72	30	1	44	105	164	Ozone
1984	344	238	70	32	4	42	101	164	Ozone
1983	239	142	64	29	4	44	112	172	Ozone

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 2012

Rutherford

All monitored counties in Tennessee

Source: U.S. EPA AirData, “Annual AQI by County” files for 1983–2012 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem