Daily Air Quality Index summaries from EPA monitors in Tippecanoe, Indiana, 1985–2025.
70%
Good days in 2025
39
Median daily AQI, 2025
0
Days above 100 in 2025
347
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Tippecanoe, Indiana on 347 days. 244 of those days (70%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in Indiana (median 41 across 33 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 347 days. Across the years with fuller monitoring, the share of Good days fell: an average of 77% in 1986–1988 versus 71% in 2023–2025.
Years with fewer than 120 monitored days (1999, 2000, 2001, 2002, 2003, 2004…) 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)
347
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
347
244
103
0
0
0
0
39
58
95
PM2.5
2024
345
256
89
0
0
0
0
35
56
67
PM2.5
2023
349
237
106
4
1
1
0
42
61
206
PM2.5
2022
350
268
82
0
0
0
0
36
56
96
PM2.5
2021
349
213
136
0
0
0
0
44
62
97
PM2.5
2020
348
167
181
0
0
0
0
51
61
73
PM2.5
2019
351
210
141
0
0
0
0
43
61
78
PM2.5
2018
345
207
138
0
0
0
0
46
59
80
PM2.5
2017
350
191
159
0
0
0
0
48
61
83
PM2.5
2016
347
248
99
0
0
0
0
40
58
88
PM2.5
2015
328
161
167
0
0
0
0
51
64
99
PM2.5
2014
316
178
137
1
0
0
0
46
65
128
PM2.5
2013
363
94
269
0
0
0
0
58
74
99
PM2.5
2012
353
59
293
1
0
0
0
59
75
104
PM2.5
2011
332
95
236
1
0
0
0
57
75
105
PM2.5
2010
365
97
266
2
0
0
0
58
77
120
PM2.5
2009
264
80
184
0
0
0
0
55
71
97
PM2.5
2008
351
131
217
3
0
0
0
55
72
131
PM2.5
2007
364
90
268
6
0
0
0
59
80
119
PM2.5
2006
364
131
233
0
0
0
0
54
73
99
PM2.5
2005
298
78
205
14
1
0
0
58
85
154
PM2.5
2004
118
42
76
0
0
0
0
55
74
95
PM2.5
2003
117
36
79
2
0
0
0
56
83
114
PM2.5
2002
94
25
68
1
0
0
0
59
80
120
PM2.5
2001
116
30
83
3
0
0
0
60
81
130
PM2.5
2000
114
28
85
1
0
0
0
61
86
111
PM2.5
1999
73
21
51
1
0
0
0
60
86
112
PM2.5
1996
98
97
1
0
0
0
0
23
40
61
NO2
1995
269
192
51
23
3
0
0
39
100
182
Ozone
1993
261
259
2
0
0
0
0
20
37
53
NO2
1992
90
90
0
0
0
0
0
18
30
46
NO2
1990
295
221
54
15
5
0
0
38
90
166
Ozone
1989
365
289
60
15
1
0
0
33
80
164
Ozone
1988
356
258
52
24
16
6
0
31
119
215
Ozone
1987
353
252
65
32
4
0
0
38
101
174
Ozone
1986
150
131
19
0
0
0
0
31
51
89
PM10
1985
112
95
17
0
0
0
0
34
54
64
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
