Daily Air Quality Index summaries from EPA monitors in Charles, Virginia, 1988–2025.
89%
Good days in 2025
35
Median daily AQI, 2025
1
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Charles, Virginia on 364 days. 323 of those days (89%) were in the Good range, and the median daily AQI was 35. That median is about the same as the typical monitored county in Virginia (median 37 across 25 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 191 days. Across the years with fuller monitoring, the share of Good days rose: an average of 65% in 1988–1990 versus 84% 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)
191
52%
Ozone
173
48%
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
364
323
40
1
0
0
0
35
51
101
PM2.5
2024
366
325
41
0
0
0
0
36
51
75
PM2.5
2023
365
273
89
2
1
0
0
40
59
151
PM2.5
2022
356
336
20
0
0
0
0
33
47
74
Ozone
2021
365
332
33
0
0
0
0
34
50
95
Ozone
2020
364
347
17
0
0
0
0
31
45
67
Ozone
2019
356
321
35
0
0
0
0
36
50
90
Ozone
2018
356
319
36
1
0
0
0
33
51
105
Ozone
2017
364
320
44
0
0
0
0
34
52
80
Ozone
2016
357
323
33
1
0
0
0
32
50
112
Ozone
2015
350
306
43
1
0
0
0
34
52
112
Ozone
2014
349
296
51
2
0
0
0
37
54
122
Ozone
2013
360
315
44
1
0
0
0
32
53
150
Ozone
2012
366
302
56
7
1
0
0
37
58
174
Ozone
2011
354
272
72
8
2
0
0
38
61
197
Ozone
2010
365
246
111
8
0
0
0
41
67
147
Ozone
2009
365
295
70
0
0
0
0
36
60
97
Ozone
2008
365
242
104
17
2
0
0
41
77
159
Ozone
2007
364
232
121
9
2
0
0
44
77
161
Ozone
2006
360
225
121
11
3
0
0
43
84
161
Ozone
2005
360
230
108
20
2
0
0
43
93
174
Ozone
2004
359
243
105
10
1
0
0
43
77
164
Ozone
2003
319
208
96
13
2
0
0
42
77
185
Ozone
2002
360
209
112
25
12
2
0
46
101
216
Ozone
2001
359
216
112
25
6
0
0
43
97
179
Ozone
2000
355
222
121
12
0
0
0
42
80
140
Ozone
1999
351
225
82
31
12
1
0
43
119
223
Ozone
1998
357
212
91
40
12
2
0
42
115
217
Ozone
1997
365
240
79
33
11
2
0
41
112
202
NO2
1996
360
251
85
22
2
0
0
38
90
164
NO2
1995
365
259
79
21
6
0
0
41
90
169
Ozone
1994
361
248
86
25
2
0
0
40
88
156
NO2
1993
291
166
75
39
10
1
0
46
122
210
Ozone
1992
203
125
57
18
3
0
0
45
101
195
Ozone
1991
212
139
49
18
6
0
0
45
101
177
Ozone
1990
205
120
58
23
3
1
0
47
105
202
Ozone
1989
205
166
34
5
0
0
0
40
67
126
Ozone
1988
210
114
50
27
13
6
0
47
150
226
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
