Daily Air Quality Index summaries from EPA monitors in Floyd, Indiana, 1988–2025.
66%
Good days in 2025
44
Median daily AQI, 2025
5
Days above 100 in 2025
362
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Floyd, Indiana on 362 days. 238 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 Indiana (median 41 across 33 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 186 days. Across the years with fuller monitoring, the share of Good days rose: an average of 57% in 1995–1997 versus 67% in 2023–2025.
Years with fewer than 120 monitored days (1988, 1989, 1990) 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)
186
51%
Ozone
176
49%
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
362
238
119
5
0
0
0
44
61
126
PM2.5
2024
360
257
102
0
1
0
0
43
58
154
Ozone
2023
347
224
116
6
1
0
0
46
67
177
Ozone
2022
354
337
17
0
0
0
0
33
45
87
Ozone
2021
363
340
23
0
0
0
0
34
48
100
Ozone
2020
363
347
15
1
0
0
0
32
44
143
Ozone
2019
361
336
25
0
0
0
0
35
48
87
Ozone
2018
346
295
46
5
0
0
0
35
55
143
Ozone
2017
365
197
163
5
0
0
0
49
63
115
PM2.5
2016
363
232
125
6
0
0
0
44
65
143
PM2.5
2015
363
150
211
2
0
0
0
52
69
108
PM2.5
2014
361
91
267
3
0
0
0
56
74
119
PM2.5
2013
363
178
183
2
0
0
0
51
66
101
PM2.5
2012
366
144
200
18
4
0
0
53
84
197
PM2.5
2011
361
87
256
17
1
0
0
60
84
174
PM2.5
2010
365
119
235
10
1
0
0
57
78
183
PM2.5
2009
340
82
258
0
0
0
0
59
74
97
PM2.5
2008
365
73
286
5
1
0
0
60
80
164
PM2.5
2007
302
91
181
27
3
0
0
60
100
179
PM2.5
2006
262
130
118
13
1
0
0
51
84
190
Ozone
2005
255
106
127
20
2
0
0
55
100
166
Ozone
2004
257
125
126
6
0
0
0
51
78
129
Ozone
2003
263
124
120
15
4
0
0
52
90
179
Ozone
2002
262
122
108
19
12
1
0
53
108
207
Ozone
2001
256
131
115
9
1
0
0
50
85
152
Ozone
2000
255
128
111
16
0
0
0
50
87
133
Ozone
1999
250
98
108
34
9
1
0
58
122
204
Ozone
1998
213
115
57
28
11
2
0
49
136
215
Ozone
1997
214
146
46
19
1
2
0
44
101
204
Ozone
1996
214
114
62
25
11
2
0
49
136
208
Ozone
1995
183
88
55
27
13
0
0
54
140
185
Ozone
1990
29
28
1
0
0
0
0
16
37
54
PM10
1989
57
48
9
0
0
0
0
24
55
59
PM10
1988
10
10
0
0
0
0
0
19
38
38
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 Indiana with a similar median AQI in 2025
