Daily Air Quality Index summaries from EPA monitors in LaPorte, Indiana, 1990–2025.
63%
Good days in 2025
43
Median daily AQI, 2025
12
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 LaPorte, Indiana on 365 days. 230 of those days (63%) were in the Good range, and the median daily AQI was 43. That median is about the same as 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 ozone on 184 days. Across the years with fuller monitoring, the share of Good days rose: an average of 62% in 1990–1992 versus 70% 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
184
50%
Fine particles (PM2.5)
181
50%
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
230
123
11
1
0
0
43
72
153
Ozone
2024
366
257
107
2
0
0
0
41
64
115
Ozone
2023
365
277
76
12
0
0
0
39
68
133
Ozone
2022
365
302
60
3
0
0
0
36
57
133
Ozone
2021
365
282
78
5
0
0
0
37
64
143
Ozone
2020
366
291
68
6
1
0
0
38
63
154
Ozone
2019
364
296
64
4
0
0
0
37
64
126
Ozone
2018
363
288
68
6
1
0
0
37
61
161
Ozone
2017
282
203
71
8
0
0
0
42
64
147
Ozone
2016
244
185
57
2
0
0
0
39
62
112
Ozone
2015
243
177
63
3
0
0
0
42
67
126
Ozone
2014
242
155
82
5
0
0
0
45
73
126
Ozone
2013
242
146
94
2
0
0
0
47
71
126
Ozone
2012
239
131
84
18
3
3
0
48
101
214
Ozone
2011
235
151
69
13
2
0
0
43
90
174
Ozone
2010
242
147
92
2
1
0
0
45
77
151
Ozone
2009
243
167
73
3
0
0
0
43
67
133
Ozone
2008
240
147
93
0
0
0
0
44
71
93
Ozone
2007
341
130
195
16
0
0
0
55
80
150
PM2.5
2006
243
143
93
7
0
0
0
46
74
133
Ozone
2005
241
95
118
24
4
0
0
57
105
179
Ozone
2004
243
141
97
5
0
0
0
44
74
119
Ozone
2003
240
111
108
18
3
0
0
52
97
164
Ozone
2002
244
106
97
22
13
6
0
55
129
212
Ozone
2001
242
109
104
23
6
0
0
55
108
182
Ozone
2000
241
124
109
5
3
0
0
50
80
195
Ozone
1999
185
113
40
25
6
1
0
45
119
203
Ozone
1998
196
99
58
28
10
1
0
50
126
204
Ozone
1997
207
135
48
16
6
2
0
44
105
233
Ozone
1996
173
98
53
12
7
3
0
47
115
213
Ozone
1995
194
106
40
27
15
6
0
48
154
227
Ozone
1994
189
111
53
16
7
2
0
46
115
207
Ozone
1993
161
106
42
13
0
0
0
44
90
140
Ozone
1992
179
128
34
12
3
2
0
43
100
210
Ozone
1991
175
90
49
24
11
1
0
49
133
213
Ozone
1990
129
82
33
13
1
0
0
44
108
166
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 Indiana with a similar median AQI in 2025
