Daily Air Quality Index summaries from EPA monitors in McMinn, Tennessee, 1985–2025.
78%
Good days in 2025
37
Median daily AQI, 2025
0
Days above 100 in 2025
357
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for McMinn, Tennessee on 357 days. 279 of those days (78%) were in the Good range, and the median daily AQI was 37. That median is about the same as 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 357 days. Across the years with fuller monitoring, the share of Good days fell: an average of 98% in 1985–1987 versus 75% in 2023–2025.
Years with fewer than 120 monitored days (2013, 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)
357
100%
Year-by-year data
Annual AQI summary by year
Year
Days with AQI
Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous
Median AQI
90th pct.
Max AQI
Main pollutant
2025
357
279
78
0
0
0
0
37
56
71
PM2.5
2024
356
281
75
0
0
0
0
32
54
89
PM2.5
2023
355
238
115
2
0
0
0
39
61
114
PM2.5
2022
357
233
124
0
0
0
0
41
56
73
PM2.5
2021
360
250
110
0
0
0
0
37
59
90
PM2.5
2020
358
280
78
0
0
0
0
37
55
89
PM2.5
2019
357
239
118
0
0
0
0
41
57
69
PM2.5
2018
356
246
110
0
0
0
0
39
57
71
PM2.5
2017
221
142
79
0
0
0
0
43
59
70
PM2.5
2016
119
76
42
0
1
0
0
43
58
172
PM2.5
2015
110
72
38
0
0
0
0
43
59
67
PM2.5
2014
273
204
69
0
0
0
0
42
58
84
Ozone
2013
100
59
41
0
0
0
0
47
62
69
PM2.5
2012
225
225
0
0
0
0
0
14
29
44
NO2
2011
358
357
1
0
0
0
0
17
32
51
NO2
2010
353
352
1
0
0
0
0
18
29
52
NO2
2009
355
355
0
0
0
0
0
14
25
42
NO2
2008
349
347
2
0
0
0
0
20
31
57
NO2
2007
364
268
93
3
0
0
0
27
69
122
NO2
2006
346
260
84
2
0
0
0
26
65
106
NO2
2005
355
270
84
1
0
0
0
25
66
102
NO2
2004
355
269
86
0
0
0
0
25
64
94
NO2
2003
320
252
66
2
0
0
0
24
63
119
NO2
2002
355
269
85
1
0
0
0
26
65
110
NO2
2001
356
265
89
2
0
0
0
27
69
120
NO2
2000
363
269
89
5
0
0
0
30
69
138
NO2
1999
354
339
14
1
0
0
0
29
44
104
NO2
1998
355
331
24
0
0
0
0
26
47
82
NO2
1997
359
345
14
0
0
0
0
26
42
62
NO2
1996
354
342
12
0
0
0
0
25
41
79
NO2
1995
352
343
9
0
0
0
0
23
38
62
NO2
1994
355
340
15
0
0
0
0
25
41
80
NO2
1993
322
310
12
0
0
0
0
25
42
89
NO2
1992
325
316
9
0
0
0
0
23
41
67
NO2
1991
357
333
24
0
0
0
0
24
42
81
NO2
1990
354
339
13
2
0
0
0
23
41
106
NO2
1989
353
325
28
0
0
0
0
24
45
99
NO2
1988
356
349
7
0
0
0
0
25
39
74
NO2
1987
330
316
12
2
0
0
0
26
41
135
NO2
1986
360
349
10
1
0
0
0
23
39
110
NO2
1985
189
189
0
0
0
0
0
20
31
47
NO2
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
