Daily Air Quality Index summaries from EPA monitors in Suffolk City, Virginia, 1987–2025.
97%
Good days in 2025
38
Median daily AQI, 2025
1
Days above 100 in 2025
245
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Suffolk City, Virginia on 245 days. 237 of those days (97%) were in the Good range, and the median daily AQI was 38. 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 245 days. Across the years with fuller monitoring, the share of Good days rose: an average of 63% in 1987–1989 versus 95% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (245 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
245
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
245
237
7
1
0
0
0
38
47
101
Ozone
2024
245
232
13
0
0
0
0
37
47
71
Ozone
2023
245
230
14
1
0
0
0
40
48
115
Ozone
2022
245
234
10
1
0
0
0
38
47
115
Ozone
2021
245
228
17
0
0
0
0
37
49
90
Ozone
2020
245
242
3
0
0
0
0
36
44
67
Ozone
2019
245
223
22
0
0
0
0
41
50
97
Ozone
2018
245
224
21
0
0
0
0
39
50
87
Ozone
2017
245
228
17
0
0
0
0
40
50
87
Ozone
2016
214
194
18
2
0
0
0
37
50
115
Ozone
2015
214
182
32
0
0
0
0
40
58
93
Ozone
2014
214
183
31
0
0
0
0
40
54
84
Ozone
2013
214
193
20
1
0
0
0
38
50
115
Ozone
2012
214
170
40
4
0
0
0
43
61
129
Ozone
2011
212
150
51
11
0
0
0
45
77
136
Ozone
2010
214
129
75
8
2
0
0
47
87
161
Ozone
2009
214
177
37
0
0
0
0
40
58
100
Ozone
2008
214
123
77
12
2
0
0
47
87
174
Ozone
2007
214
115
85
13
1
0
0
50
93
174
Ozone
2006
214
119
82
12
1
0
0
49
90
164
Ozone
2005
214
125
73
15
1
0
0
48
93
151
Ozone
2004
214
145
59
9
1
0
0
44
90
185
Ozone
2003
212
138
56
14
3
1
0
45
97
205
Ozone
2002
214
123
53
25
12
1
0
48
133
206
Ozone
2001
214
124
64
23
2
1
0
47
105
203
Ozone
2000
214
118
60
34
2
0
0
48
119
164
Ozone
1999
214
106
68
31
8
1
0
51
133
206
Ozone
1998
229
111
74
36
8
0
0
51
122
182
Ozone
1997
239
121
69
39
10
0
0
50
129
187
Ozone
1996
239
163
58
17
1
0
0
44
87
151
Ozone
1995
238
134
73
25
6
0
0
47
112
200
Ozone
1994
239
139
72
25
2
1
0
45
105
202
Ozone
1993
239
110
68
44
16
1
0
54
136
210
Ozone
1992
238
147
66
19
4
2
0
46
105
217
Ozone
1991
234
127
65
39
3
0
0
49
115
161
Ozone
1990
236
121
78
29
8
0
0
50
115
182
Ozone
1989
228
174
48
5
1
0
0
38
77
182
Ozone
1988
212
119
57
17
14
5
0
48
140
205
Ozone
1987
212
119
51
27
14
1
0
47
133
201
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
