Daily Air Quality Index summaries from EPA monitors in Wood, Ohio, 1997–2025.
85%
Good days in 2025
39
Median daily AQI, 2025
1
Days above 100 in 2025
244
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Wood, Ohio on 244 days. 208 of those days (85%) were in the Good range, and the median daily AQI was 39. That median is lower than the typical monitored county in Ohio (median 43 across 36 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 244 days. Across the years with fuller monitoring, the share of Good days rose: an average of 64% in 1997–1999 versus 83% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (244 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.
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
244
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
244
208
35
1
0
0
0
39
58
108
Ozone
2024
245
203
41
1
0
0
0
41
58
101
Ozone
2023
241
198
39
4
0
0
0
40
61
126
Ozone
2022
242
220
22
0
0
0
0
38
50
97
Ozone
2021
245
216
29
0
0
0
0
39
51
90
Ozone
2020
229
216
13
0
0
0
0
34
46
80
Ozone
2019
244
225
19
0
0
0
0
38
49
87
Ozone
2018
245
213
30
2
0
0
0
38
61
115
Ozone
2017
245
217
28
0
0
0
0
38
54
97
Ozone
2016
214
170
41
3
0
0
0
41
64
115
Ozone
2015
212
188
24
0
0
0
0
41
51
77
Ozone
2014
214
188
25
1
0
0
0
39
54
101
Ozone
2013
214
186
28
0
0
0
0
39
54
100
Ozone
2012
214
145
56
12
1
0
0
44
93
174
Ozone
2011
214
166
39
9
0
0
0
42
77
129
Ozone
2010
214
159
53
2
0
0
0
44
71
105
Ozone
2009
214
179
34
1
0
0
0
40
64
101
Ozone
2008
214
164
47
3
0
0
0
43
71
122
Ozone
2007
213
148
49
13
3
0
0
44
93
159
Ozone
2006
213
157
51
5
0
0
0
43
77
136
Ozone
2005
214
134
57
21
2
0
0
45
105
166
Ozone
2004
214
167
41
6
0
0
0
42
67
129
Ozone
2003
214
158
42
9
5
0
0
44
80
177
Ozone
2002
213
147
35
17
13
1
0
44
129
203
Ozone
2001
214
149
40
18
7
0
0
44
108
169
Ozone
2000
211
158
45
7
1
0
0
41
74
151
Ozone
1999
214
140
48
20
6
0
0
44
115
177
Ozone
1998
213
120
70
21
2
0
0
48
108
172
Ozone
1997
214
150
45
17
2
0
0
41
93
177
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 Ohio with a similar median AQI in 2025
