Daily Air Quality Index summaries from EPA monitors in Davidson, Tennessee, 1980–2025.
53%
Good days in 2025
49
Median daily AQI, 2025
1
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Davidson, Tennessee on 365 days. 193 of those days (53%) were in the Good range, and the median daily AQI was 49. That median is higher than the typical monitored county in Tennessee (median 39 across 23 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 234 days. Across the years with fuller monitoring, the share of Good days rose: an average of 34% in 1980–1982 versus 47% in 2023–2025.
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)
234
64%
Ozone
126
35%
Nitrogen dioxide (NO₂)
5
1%
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
365
193
171
1
0
0
0
49
64
136
PM2.5
2024
366
189
171
6
0
0
0
50
62
122
PM2.5
2023
365
136
225
4
0
0
0
53
68
133
PM2.5
2022
365
169
194
2
0
0
0
51
66
143
PM2.5
2021
365
152
209
4
0
0
0
52
70
116
PM2.5
2020
366
190
174
2
0
0
0
50
62
116
PM2.5
2019
365
151
213
1
0
0
0
52
64
101
PM2.5
2018
365
164
196
4
1
0
0
52
67
151
PM2.5
2017
365
161
203
1
0
0
0
53
65
133
PM2.5
2016
366
148
213
5
0
0
0
53
64
126
PM2.5
2015
365
141
224
0
0
0
0
53
67
97
PM2.5
2014
365
128
233
4
0
0
0
54
71
108
PM2.5
2013
365
144
220
1
0
0
0
53
64
101
PM2.5
2012
366
120
228
16
2
0
0
54
80
169
PM2.5
2011
365
128
233
4
0
0
0
54
71
150
PM2.5
2010
365
94
265
6
0
0
0
56
74
133
PM2.5
2009
365
116
249
0
0
0
0
54
67
97
PM2.5
2008
366
83
278
5
0
0
0
57
75
129
PM2.5
2007
365
63
268
32
2
0
0
61
100
187
PM2.5
2006
365
52
296
15
2
0
0
61
87
182
PM2.5
2005
365
43
293
28
1
0
0
62
97
172
PM2.5
2004
366
80
278
8
0
0
0
58
80
140
PM2.5
2003
365
48
302
15
0
0
0
61
87
150
PM2.5
2002
365
54
287
24
0
0
0
60
89
140
PM2.5
2001
365
61
289
13
2
0
0
63
87
179
PM2.5
2000
366
41
286
38
1
0
0
65
101
177
PM2.5
1999
365
104
202
39
20
0
0
64
112
195
Ozone
1998
365
246
81
26
11
1
0
42
101
202
Ozone
1997
365
246
84
28
7
0
0
42
100
197
Ozone
1996
366
241
86
33
6
0
0
42
101
200
Ozone
1995
365
231
93
30
11
0
0
44
105
187
Ozone
1994
365
222
116
19
8
0
0
46
90
187
Ozone
1993
365
281
76
7
1
0
0
39
69
154
Ozone
1992
366
295
69
2
0
0
0
38
57
143
NO2
1991
365
288
70
7
0
0
0
39
64
147
Ozone
1990
365
250
96
16
3
0
0
43
82
179
Ozone
1989
365
219
139
6
1
0
0
46
73
154
CO
1988
366
186
127
32
18
3
0
50
119
219
CO
1987
365
161
193
11
0
0
0
53
81
147
CO
1986
365
152
202
11
0
0
0
54
77
143
CO
1985
365
177
185
3
0
0
0
51
73
122
CO
1984
366
92
250
21
3
0
0
63
94
170
CO
1983
365
78
242
37
6
2
0
68
108
208
CO
1982
365
106
241
16
1
1
0
62
89
217
CO
1981
365
106
241
16
2
0
0
62
90
158
CO
1980
366
160
187
16
3
0
0
54
90
169
CO
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
