Daily Air Quality Index summaries from EPA monitors in Elkhart, Indiana, 1992–2025.
61%
Good days in 2025
43
Median daily AQI, 2025
6
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Elkhart, Indiana on 364 days. 222 of those days (61%) 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 fine particles (PM2.5) on 214 days. Across the years with fuller monitoring, the share of Good days fell: an average of 74% in 1992–1994 versus 62% 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
Fine particles (PM2.5)
214
59%
Ozone
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
364
222
136
5
1
0
0
43
66
171
PM2.5
2024
366
227
138
1
0
0
0
45
62
145
PM2.5
2023
365
228
130
5
2
0
0
44
69
193
PM2.5
2022
362
242
117
3
0
0
0
43
60
127
PM2.5
2021
365
214
151
0
0
0
0
45
62
87
PM2.5
2020
366
254
110
0
2
0
0
42
58
161
PM2.5
2019
365
251
114
0
0
0
0
41
61
83
PM2.5
2018
363
228
132
3
0
0
0
44
62
105
PM2.5
2017
365
248
116
1
0
0
0
42
62
105
PM2.5
2016
358
197
153
8
0
0
0
48
70
131
PM2.5
2015
357
175
179
3
0
0
0
51
73
124
PM2.5
2014
360
82
268
10
0
0
0
58
78
126
PM2.5
2013
350
131
216
3
0
0
0
54
69
126
PM2.5
2012
362
138
212
11
0
1
0
54
82
206
PM2.5
2011
353
122
225
6
0
0
0
56
77
147
PM2.5
2010
268
158
108
2
0
0
0
47
76
110
Ozone
2009
240
163
76
1
0
0
0
41
70
103
Ozone
2008
238
126
108
4
0
0
0
49
83
139
Ozone
2007
312
94
199
17
2
0
0
58
93
162
PM2.5
2006
240
143
95
2
0
0
0
47
74
133
Ozone
2005
241
90
125
21
5
0
0
59
101
172
Ozone
2004
241
139
96
6
0
0
0
48
80
133
Ozone
2003
241
107
118
11
5
0
0
53
92
169
Ozone
2002
241
100
106
18
16
1
0
56
122
206
Ozone
2001
214
124
86
4
0
0
0
45
78
131
PM2.5
2000
226
134
86
6
0
0
0
44
77
126
Ozone
1999
202
122
69
11
0
0
0
44
90
140
Ozone
1998
170
101
52
15
2
0
0
47
105
190
Ozone
1997
168
112
43
8
5
0
0
44
97
182
Ozone
1996
179
109
46
16
8
0
0
47
108
197
Ozone
1995
177
107
48
18
4
0
0
48
122
185
Ozone
1994
175
115
46
12
2
0
0
44
97
192
Ozone
1993
183
136
37
9
1
0
0
42
80
151
Ozone
1992
183
148
26
8
1
0
0
37
84
169
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
