Daily Air Quality Index summaries from EPA monitors in Kent, Maryland, 1989–2025.
84%
Good days in 2025
38
Median daily AQI, 2025
1
Days above 100 in 2025
356
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Kent, Maryland on 356 days. 299 of those days (84%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in Maryland (median 39.5 across 16 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 206 days. Across the years with fuller monitoring, the share of Good days rose: an average of 66% in 1989–1991 versus 80% 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
Ozone
206
58%
Fine particles (PM2.5)
150
42%
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
356
299
56
1
0
0
0
38
55
129
Ozone
2024
362
289
71
2
0
0
0
40
61
105
Ozone
2023
361
276
78
4
3
0
0
41
61
199
Ozone
2022
361
292
69
0
0
0
0
40
54
93
Ozone
2021
357
284
72
1
0
0
0
40
56
108
Ozone
2020
359
333
26
0
0
0
0
36
48
100
Ozone
2019
360
272
87
1
0
0
0
42
61
101
Ozone
2018
361
262
96
3
0
0
0
42
62
119
Ozone
2017
358
194
161
3
0
0
0
49
63
147
PM2.5
2016
357
259
94
4
0
0
0
42
67
150
PM2.5
2015
347
188
152
7
0
0
0
49
67
108
PM2.5
2014
351
221
129
1
0
0
0
45
64
112
PM2.5
2013
353
213
138
2
0
0
0
46
66
126
PM2.5
2012
356
142
188
19
7
0
0
54
87
190
PM2.5
2011
348
163
169
13
3
0
0
52
78
187
PM2.5
2010
271
157
100
13
1
0
0
46
84
169
Ozone
2009
209
177
30
2
0
0
0
42
61
115
Ozone
2008
213
138
52
21
2
0
0
45
105
185
Ozone
2007
209
119
70
19
1
0
0
49
100
151
Ozone
2006
214
135
56
21
2
0
0
45
105
179
Ozone
2005
212
143
44
22
3
0
0
44
105
172
Ozone
2004
214
142
59
12
1
0
0
44
93
172
Ozone
2003
214
149
45
16
2
2
0
44
100
204
Ozone
2002
214
117
55
25
15
2
0
47
140
216
Ozone
2001
210
122
59
16
12
1
0
47
119
201
Ozone
2000
214
141
49
18
2
4
0
43
105
214
Ozone
1999
214
124
47
22
18
3
0
48
150
216
Ozone
1998
213
101
64
33
15
0
0
51
140
192
Ozone
1997
214
121
50
27
13
3
0
49
143
216
Ozone
1996
210
120
69
16
5
0
0
46
105
169
Ozone
1995
210
116
51
28
12
3
0
47
136
213
Ozone
1994
213
114
66
25
8
0
0
49
115
161
Ozone
1993
210
96
55
40
17
2
0
54
150
216
Ozone
1992
205
130
48
20
7
0
0
45
108
182
Ozone
1991
276
172
55
34
9
6
0
44
126
214
Ozone
1990
335
243
57
29
6
0
0
37
101
197
Ozone
1989
122
77
23
14
7
1
0
41
119
210
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 Maryland with a similar median AQI in 2025
