Daily Air Quality Index summaries from EPA monitors in Van Buren, Iowa, 1991–2025.
65%
Good days in 2025
44
Median daily AQI, 2025
2
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 Van Buren, Iowa on 364 days. 236 of those days (65%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Iowa (median 43.5 across 14 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 270 days. Across the years with fuller monitoring, the share of Good days fell: an average of 86% in 1991–1993 versus 61% 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)
270
74%
Ozone
93
26%
Coarse particles (PM10)
1
<1%
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
236
126
2
0
0
0
44
61
129
PM2.5
2024
365
227
137
1
0
0
0
46
59
138
PM2.5
2023
363
208
148
5
2
0
0
46
65
176
PM2.5
2022
365
271
93
1
0
0
0
43
55
102
PM2.5
2021
362
223
139
0
0
0
0
44
60
94
PM2.5
2020
366
281
85
0
0
0
0
39
55
87
PM2.5
2019
361
266
95
0
0
0
0
42
58
97
PM2.5
2018
359
230
129
0
0
0
0
43
61
100
PM2.5
2017
365
206
159
0
0
0
0
47
61
84
PM2.5
2016
366
177
187
1
1
0
0
51
64
158
PM2.5
2015
365
217
147
0
1
0
0
47
61
155
PM2.5
2014
358
177
181
0
0
0
0
51
66
93
PM2.5
2013
363
204
159
0
0
0
0
48
62
97
PM2.5
2012
366
184
172
10
0
0
0
50
74
129
PM2.5
2011
315
169
146
0
0
0
0
48
65
89
PM2.5
2010
267
191
74
2
0
0
0
42
67
108
Ozone
2009
263
198
65
0
0
0
0
39
59
97
Ozone
2008
261
200
61
0
0
0
0
37
60
93
Ozone
2007
262
165
93
4
0
0
0
44
74
122
Ozone
2006
323
253
67
3
0
0
0
34
61
129
Ozone
2005
365
264
98
3
0
0
0
39
69
142
Ozone
2004
366
280
85
1
0
0
0
38
63
146
Ozone
2003
361
247
110
4
0
0
0
41
79
150
Ozone
2002
365
249
97
18
1
0
0
39
79
172
Ozone
2001
340
248
88
4
0
0
0
38
74
122
Ozone
2000
256
160
88
8
0
0
0
46
77
122
Ozone
1999
210
150
50
10
0
0
0
43
84
150
Ozone
1998
212
164
44
4
0
0
0
43
71
119
Ozone
1997
251
226
25
0
0
0
0
35
50
100
Ozone
1996
349
315
31
3
0
0
0
33
50
119
Ozone
1995
280
247
31
2
0
0
0
36
54
105
Ozone
1993
197
181
14
2
0
0
0
36
50
115
Ozone
1992
262
229
25
7
1
0
0
32
58
164
Ozone
1991
184
143
33
7
1
0
0
37
84
164
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 Iowa with a similar median AQI in 2025
