Daily Air Quality Index summaries from EPA monitors in Lawrence, Ohio, 1988–2025.
71%
Good days in 2025
42
Median daily AQI, 2025
0
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 Lawrence, Ohio on 365 days. 259 of those days (71%) were in the Good range, and the median daily AQI was 42. That median is about the same as 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 fine particles (PM2.5) on 197 days. Across the years with fuller monitoring, the share of Good days fell: an average of 72% in 1989–1991 versus 68% in 2023–2025.
Years with fewer than 120 monitored days (1988) are shown in the table but left out of comparisons and trend statements.
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)
197
54%
Ozone
168
46%
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
259
106
0
0
0
0
42
59
90
PM2.5
2024
366
264
102
0
0
0
0
43
58
99
PM2.5
2023
365
225
134
4
2
0
0
46
64
160
PM2.5
2022
361
220
141
0
0
0
0
45
58
74
PM2.5
2021
365
210
155
0
0
0
0
46
62
99
PM2.5
2020
354
279
75
0
0
0
0
40
56
77
PM2.5
2019
365
263
102
0
0
0
0
43
55
77
PM2.5
2018
365
271
92
2
0
0
0
42
58
119
PM2.5
2017
365
292
71
1
1
0
0
40
54
162
PM2.5
2016
366
227
136
3
0
0
0
46
61
119
PM2.5
2015
365
187
175
3
0
0
0
50
67
112
PM2.5
2014
365
163
201
1
0
0
0
52
64
103
PM2.5
2013
364
159
204
1
0
0
0
52
67
105
PM2.5
2012
364
136
218
9
1
0
0
53
74
161
PM2.5
2011
364
99
253
12
0
0
0
56
84
126
PM2.5
2010
306
71
221
13
1
0
0
59
87
152
PM2.5
2009
264
146
116
2
0
0
0
48
70
108
Ozone
2008
263
101
145
15
2
0
0
55
90
166
Ozone
2007
262
100
137
23
2
0
0
58
100
159
Ozone
2006
265
129
128
6
2
0
0
51
84
178
Ozone
2005
263
127
123
12
1
0
0
51
90
181
Ozone
2004
263
159
103
1
0
0
0
44
71
108
Ozone
2003
268
133
125
8
2
0
0
51
84
164
Ozone
2002
262
98
120
30
14
0
0
57
122
200
Ozone
2001
263
105
119
37
2
0
0
60
112
174
Ozone
2000
259
106
134
17
2
0
0
58
100
164
Ozone
1999
252
111
84
41
16
0
0
58
136
195
Ozone
1998
240
136
55
34
13
2
0
46
126
214
Ozone
1997
239
164
48
23
4
0
0
44
105
156
Ozone
1996
239
168
50
17
3
1
0
42
97
206
Ozone
1995
239
148
58
26
7
0
0
44
112
172
Ozone
1994
234
157
54
19
3
1
0
44
100
204
Ozone
1993
225
161
48
14
2
0
0
39
90
161
Ozone
1992
203
155
38
8
2
0
0
36
80
161
Ozone
1991
237
131
64
28
10
4
0
48
119
228
Ozone
1990
280
210
45
15
9
1
0
35
93
203
PM10
1989
249
215
34
0
0
0
0
29
52
73
PM10
1988
90
90
0
0
0
0
0
26
39
50
PM10
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
