Daily Air Quality Index summaries from EPA monitors in Osceola, Florida, 1993–2025.
84%
Good days in 2025
40
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 Osceola, Florida on 365 days. 305 of those days (84%) were in the Good range, and the median daily AQI was 40. 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 215 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 88% in 1994–1996 versus 89% in 2023–2025.
Years with fewer than 120 monitored days (1993) are shown in the table but left out of comparisons and trend statements.
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
215
59%
Fine particles (PM2.5)
150
41%
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
305
59
1
0
0
0
40
53
105
Ozone
2024
349
314
34
1
0
0
0
36
51
108
Ozone
2023
356
330
26
0
0
0
0
36
48
80
Ozone
2022
364
348
16
0
0
0
0
34
46
80
Ozone
2021
355
339
16
0
0
0
0
33
46
93
Ozone
2020
366
354
12
0
0
0
0
32
44
90
Ozone
2019
364
338
22
4
0
0
0
34
48
122
Ozone
2018
365
330
33
2
0
0
0
33
50
126
Ozone
2017
363
345
16
2
0
0
0
34
47
133
Ozone
2016
366
342
24
0
0
0
0
35
49
90
Ozone
2015
357
345
12
0
0
0
0
32
44
87
Ozone
2014
348
316
32
0
0
0
0
33
50
100
Ozone
2013
358
334
23
1
0
0
0
34
49
112
Ozone
2012
354
327
27
0
0
0
0
35
49
97
Ozone
2011
364
320
43
1
0
0
0
34
51
108
Ozone
2010
365
327
36
2
0
0
0
36
51
133
Ozone
2009
365
347
18
0
0
0
0
34
47
93
Ozone
2008
357
337
16
4
0
0
0
33
48
119
Ozone
2007
365
313
46
6
0
0
0
36
61
143
Ozone
2006
364
299
59
6
0
0
0
37
67
133
Ozone
2005
343
287
46
10
0
0
0
34
61
119
Ozone
2004
331
295
33
3
0
0
0
35
54
147
Ozone
2003
352
329
20
3
0
0
0
32
45
126
Ozone
2002
360
329
29
2
0
0
0
33
49
126
Ozone
2001
364
320
36
7
1
0
0
34
58
151
Ozone
2000
349
256
76
17
0
0
0
39
87
133
Ozone
1999
354
289
53
12
0
0
0
38
74
136
Ozone
1998
363
285
58
12
8
0
0
38
80
182
Ozone
1997
364
305
51
7
1
0
0
37
71
159
Ozone
1996
363
318
38
7
0
0
0
36
54
143
Ozone
1995
365
321
41
3
0
0
0
37
54
119
Ozone
1994
360
318
31
10
1
0
0
33
61
159
Ozone
1993
118
110
6
2
0
0
0
31
43
112
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
