Daily Air Quality Index summaries from EPA monitors in Outagamie, Wisconsin, 1980–2025.
72%
Good days in 2025
38
Median daily AQI, 2025
9
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 Outagamie, Wisconsin on 365 days. 264 of those days (72%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in Wisconsin (median 38 across 29 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 258 days. Across the years with fuller monitoring, the share of Good days fell: an average of 83% in 1980–1982 versus 69% 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)
258
71%
Ozone
107
29%
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
264
92
3
6
0
0
38
64
172
PM2.5
2024
366
291
75
0
0
0
0
37
57
99
PM2.5
2023
360
195
152
8
5
0
0
48
78
186
PM2.5
2022
365
241
123
1
0
0
0
43
60
122
PM2.5
2021
363
226
134
3
0
0
0
44
66
139
PM2.5
2020
366
254
110
2
0
0
0
40
60
126
PM2.5
2019
365
258
105
2
0
0
0
41
63
119
PM2.5
2018
361
264
96
1
0
0
0
42
63
101
Ozone
2017
357
280
77
0
0
0
0
37
58
90
Ozone
2016
349
272
75
2
0
0
0
36
60
108
PM2.5
2015
362
242
120
0
0
0
0
43
64
98
PM2.5
2014
365
196
166
3
0
0
0
48
67
111
PM2.5
2013
365
211
153
1
0
0
0
46
67
105
PM2.5
2012
366
194
160
11
1
0
0
49
78
182
PM2.5
2011
303
198
101
4
0
0
0
42
67
119
PM2.5
2010
261
208
49
4
0
0
0
40
61
108
Ozone
2009
363
204
153
6
0
0
0
47
74
113
PM2.5
2008
256
176
79
0
1
0
0
43
67
152
Ozone
2007
252
152
90
10
0
0
0
45
77
143
Ozone
2006
245
157
82
6
0
0
0
44
74
121
Ozone
2005
245
144
85
16
0
0
0
44
87
143
Ozone
2004
247
176
66
5
0
0
0
41
71
112
Ozone
2003
243
166
68
9
0
0
0
44
74
150
Ozone
2002
245
163
74
8
0
0
0
42
77
143
Ozone
2001
244
162
69
10
3
0
0
43
83
161
Ozone
2000
242
180
60
2
0
0
0
38
69
136
Ozone
1999
240
151
71
12
6
0
0
44
86
182
Ozone
1998
184
141
36
6
1
0
0
44
67
161
Ozone
1997
178
146
27
4
1
0
0
38
64
151
Ozone
1996
182
142
29
10
1
0
0
40
80
154
Ozone
1995
181
149
21
9
2
0
0
37
84
161
Ozone
1994
176
164
10
2
0
0
0
35
48
129
Ozone
1993
183
174
9
0
0
0
0
31
44
97
Ozone
1992
183
156
22
5
0
0
0
34
67
140
Ozone
1991
175
142
27
6
0
0
0
36
74
119
Ozone
1990
178
162
15
1
0
0
0
36
50
122
Ozone
1989
179
146
25
8
0
0
0
39
84
140
Ozone
1988
182
113
34
24
10
1
0
44
133
202
Ozone
1987
184
145
29
9
1
0
0
38
77
156
Ozone
1986
184
151
27
6
0
0
0
35
67
133
Ozone
1985
183
150
28
4
1
0
0
37
71
156
Ozone
1984
177
147
24
5
1
0
0
39
67
164
Ozone
1983
185
129
35
14
7
0
0
42
101
187
Ozone
1982
197
148
37
9
3
0
0
39
84
166
Ozone
1981
186
161
19
5
1
0
0
35
64
159
Ozone
1980
202
175
19
8
0
0
0
34
61
150
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 Wisconsin with a similar median AQI in 2025
