Daily Air Quality Index summaries from EPA monitors in Volusia, Florida, 1992–2025.
81%
Good days in 2025
41
Median daily AQI, 2025
0
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 Volusia, Florida on 365 days. 297 of those days (81%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in Florida (median 41 across 38 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 197 days. Across the years with fuller monitoring, the share of Good days fell: an average of 84% in 1992–1994 versus 78% 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
Ozone
197
54%
Fine particles (PM2.5)
168
46%
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
297
68
0
0
0
0
41
53
90
Ozone
2024
360
293
67
0
0
0
0
39
53
76
PM2.5
2023
365
262
102
1
0
0
0
44
58
118
PM2.5
2022
365
242
123
0
0
0
0
45
57
93
PM2.5
2021
363
223
140
0
0
0
0
47
58
77
PM2.5
2020
362
252
110
0
0
0
0
44
56
77
PM2.5
2019
350
274
76
0
0
0
0
41
55
80
PM2.5
2018
365
291
74
0
0
0
0
41
55
80
PM2.5
2017
354
280
74
0
0
0
0
41
55
95
Ozone
2016
359
276
83
0
0
0
0
42
56
90
PM2.5
2015
365
295
70
0
0
0
0
40
55
83
PM2.5
2014
365
244
120
1
0
0
0
43
58
108
PM2.5
2013
365
271
94
0
0
0
0
42
56
90
PM2.5
2012
366
230
135
1
0
0
0
46
59
101
PM2.5
2011
365
217
146
1
1
0
0
46
62
153
PM2.5
2010
365
216
148
1
0
0
0
46
61
101
PM2.5
2009
365
232
133
0
0
0
0
46
58
82
PM2.5
2008
366
188
178
0
0
0
0
50
62
100
PM2.5
2007
365
291
71
2
1
0
0
41
58
192
Ozone
2006
365
266
93
6
0
0
0
42
67
119
Ozone
2005
365
279
83
3
0
0
0
39
61
133
Ozone
2004
356
273
82
1
0
0
0
39
62
126
Ozone
2003
365
307
52
6
0
0
0
35
56
122
Ozone
2002
365
292
71
2
0
0
0
37
59
126
Ozone
2001
365
276
82
7
0
0
0
40
64
136
Ozone
2000
366
255
101
9
1
0
0
42
74
164
Ozone
1999
362
232
119
11
0
0
0
44
77
142
Ozone
1998
364
293
50
17
3
1
0
39
80
205
Ozone
1997
363
312
41
10
0
0
0
37
61
133
Ozone
1996
364
312
50
2
0
0
0
36
58
105
Ozone
1995
365
316
48
1
0
0
0
37
58
122
Ozone
1994
365
315
43
7
0
0
0
35
58
147
Ozone
1993
365
295
63
7
0
0
0
36
64
140
Ozone
1992
365
306
52
7
0
0
0
34
67
129
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 Florida with a similar median AQI in 2025
