Daily Air Quality Index summaries from EPA monitors in Bay, Florida, 1992–2025.
66%
Good days in 2025
44
Median daily AQI, 2025
0
Days above 100 in 2025
360
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Bay, Florida on 360 days. 239 of those days (66%) were in the Good range, and the median daily AQI was 44. That median is higher than the typical monitored county in Florida (median 41 across 38 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 249 days. Across the years with fuller monitoring, the share of Good days fell: an average of 71% in 2000–2002 versus 58% in 2023–2025.
Years with fewer than 120 monitored days (1994, 1995, 1996, 1997, 1998, 1999…) 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
Fine particles (PM2.5)
249
69%
Ozone
111
31%
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
360
239
121
0
0
0
0
44
56
92
PM2.5
2024
356
214
141
0
0
1
0
47
60
215
PM2.5
2023
365
176
189
0
0
0
0
51
61
95
PM2.5
2022
365
218
147
0
0
0
0
46
59
99
PM2.5
2021
365
228
137
0
0
0
0
46
57
78
PM2.5
2020
363
210
151
2
0
0
0
47
62
146
PM2.5
2019
357
240
117
0
0
0
0
44
59
87
PM2.5
2018
323
209
113
1
0
0
0
44
58
126
PM2.5
2017
365
227
138
0
0
0
0
46
61
97
PM2.5
2016
366
279
87
0
0
0
0
43
56
87
PM2.5
2015
365
254
111
0
0
0
0
43
57
84
PM2.5
2014
365
219
146
0
0
0
0
46
63
100
PM2.5
2013
364
227
135
2
0
0
0
46
60
144
PM2.5
2012
366
239
127
0
0
0
0
44
63
100
PM2.5
2011
364
174
187
3
0
0
0
51
66
105
PM2.5
2010
365
167
192
6
0
0
0
52
71
140
PM2.5
2009
365
225
139
1
0
0
0
47
62
143
PM2.5
2008
366
266
91
9
0
0
0
40
71
150
Ozone
2007
364
244
109
11
0
0
0
44
77
136
Ozone
2006
365
221
127
17
0
0
0
46
80
147
Ozone
2005
360
235
110
15
0
0
0
43
80
147
Ozone
2004
359
232
107
18
2
0
0
44
80
166
Ozone
2003
359
244
92
20
3
0
0
41
84
185
Ozone
2002
365
268
93
4
0
0
0
41
66
115
Ozone
2001
359
249
97
11
2
0
0
42
77
166
Ozone
2000
201
139
33
20
8
1
0
39
122
208
Ozone
1999
52
51
1
0
0
0
0
23
32
63
PM10
1998
54
51
3
0
0
0
0
22
45
60
PM10
1997
56
55
1
0
0
0
0
22
35
54
PM10
1996
57
56
1
0
0
0
0
19
29
52
PM10
1995
55
53
2
0
0
0
0
20
34
64
PM10
1994
62
61
1
0
0
0
0
20
31
51
PM10
1993
46
45
1
0
0
0
0
26
43
52
PM10
1992
16
16
0
0
0
0
0
21
42
47
PM10
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
