Daily Air Quality Index summaries from EPA monitors in Licking, Ohio, 1991–2025.
86%
Good days in 2025
40
Median daily AQI, 2025
1
Days above 100 in 2025
245
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Licking, Ohio on 245 days. 210 of those days (86%) were in the Good range, and the median daily AQI was 40. 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 245 days. Across the years with fuller monitoring, the share of Good days rose: an average of 59% in 1991–1993 versus 85% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (245 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
245
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
245
210
34
1
0
0
0
40
61
119
Ozone
2024
245
205
40
0
0
0
0
42
58
100
Ozone
2023
245
209
36
0
0
0
0
43
61
97
Ozone
2022
245
226
17
2
0
0
0
39
49
115
Ozone
2021
245
227
18
0
0
0
0
38
49
87
Ozone
2020
245
230
15
0
0
0
0
37
48
77
Ozone
2019
245
223
22
0
0
0
0
41
50
80
Ozone
2018
245
210
35
0
0
0
0
40
54
100
Ozone
2017
245
221
24
0
0
0
0
39
50
100
Ozone
2016
214
172
39
3
0
0
0
43
64
108
Ozone
2015
213
177
34
2
0
0
0
42
58
108
Ozone
2014
214
192
22
0
0
0
0
41
54
100
Ozone
2013
214
190
23
1
0
0
0
41
51
105
Ozone
2012
212
125
70
15
2
0
0
47
93
200
Ozone
2011
214
158
48
8
0
0
0
44
71
140
Ozone
2010
214
129
75
10
0
0
0
46
80
136
Ozone
2009
214
169
42
3
0
0
0
42
67
119
Ozone
2008
213
147
57
9
0
0
0
45
84
126
Ozone
2007
214
126
70
18
0
0
0
47
97
143
Ozone
2006
228
160
62
6
0
0
0
43
80
140
Ozone
2005
234
149
61
22
2
0
0
44
101
151
Ozone
2004
238
166
58
14
0
0
0
43
84
122
Ozone
2003
236
159
61
12
4
0
0
43
84
192
Ozone
2002
237
139
58
28
11
1
0
45
133
204
Ozone
2001
237
149
64
21
3
0
0
45
101
169
Ozone
2000
224
148
61
11
3
1
0
45
90
201
Ozone
1999
206
111
60
28
7
0
0
49
126
187
Ozone
1998
214
94
71
35
14
0
0
54
140
187
Ozone
1997
239
151
63
19
6
0
0
44
101
182
Ozone
1996
222
122
62
28
9
1
0
48
115
204
Ozone
1995
212
110
66
25
10
1
0
49
126
210
Ozone
1994
208
116
55
31
6
0
0
47
115
169
Ozone
1993
208
144
51
12
1
0
0
44
90
159
Ozone
1992
206
124
62
15
5
0
0
46
100
164
Ozone
1991
210
102
55
38
14
1
0
54
143
201
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
