Daily Air Quality Index summaries from EPA monitors in Wythe, Virginia, 1990–2025.
94%
Good days in 2025
39
Median daily AQI, 2025
0
Days above 100 in 2025
239
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Wythe, Virginia on 239 days. 225 of those days (94%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in Virginia (median 37 across 25 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 239 days. Across the years with fuller monitoring, the share of Good days rose: an average of 61% in 1990–1992 versus 94% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (239 of 365 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.
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
Ozone
239
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
239
225
14
0
0
0
0
39
48
77
Ozone
2024
245
236
9
0
0
0
0
41
49
67
Ozone
2023
244
224
20
0
0
0
0
40
49
87
Ozone
2022
245
232
13
0
0
0
0
39
47
77
Ozone
2021
242
228
14
0
0
0
0
39
49
71
Ozone
2020
235
233
2
0
0
0
0
34
45
61
Ozone
2019
242
232
10
0
0
0
0
41
48
71
Ozone
2018
237
207
30
0
0
0
0
40
54
84
Ozone
2017
245
231
14
0
0
0
0
40
48
77
Ozone
2016
208
191
17
0
0
0
0
41
50
100
Ozone
2015
211
196
15
0
0
0
0
38
49
74
Ozone
2014
213
193
20
0
0
0
0
40
50
87
Ozone
2013
213
205
8
0
0
0
0
39
47
87
Ozone
2012
178
139
36
3
0
0
0
44
64
133
Ozone
2011
214
167
47
0
0
0
0
45
64
100
Ozone
2010
214
162
50
2
0
0
0
44
67
105
Ozone
2009
214
195
19
0
0
0
0
38
50
80
Ozone
2008
214
161
48
5
0
0
0
45
71
119
Ozone
2007
214
114
96
4
0
0
0
50
84
122
Ozone
2006
214
144
69
1
0
0
0
46
71
108
Ozone
2005
210
133
65
12
0
0
0
46
93
147
Ozone
2004
207
161
45
1
0
0
0
43
71
133
Ozone
2003
210
139
63
6
2
0
0
45
80
174
Ozone
2002
214
124
64
23
3
0
0
48
108
169
Ozone
2001
210
140
58
12
0
0
0
46
84
150
Ozone
2000
213
127
68
17
1
0
0
47
100
154
Ozone
1999
214
75
108
28
3
0
0
71
108
166
Ozone
1998
213
90
84
34
5
0
0
58
112
177
Ozone
1997
212
105
80
26
1
0
0
51
105
159
Ozone
1996
212
115
85
12
0
0
0
49
90
126
Ozone
1995
211
111
83
16
1
0
0
50
100
161
Ozone
1994
213
129
72
10
2
0
0
47
93
174
Ozone
1993
213
80
98
32
3
0
0
67
108
156
Ozone
1992
214
145
64
5
0
0
0
45
80
136
Ozone
1991
212
118
81
13
0
0
0
50
93
147
Ozone
1990
211
127
60
22
2
0
0
48
101
164
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 Virginia with a similar median AQI in 2025
