Daily Air Quality Index summaries from EPA monitors in Kenton, Kentucky, 1980–2010.
50%
Good days in 2010
50
Median daily AQI, 2010
1
Days above 100 in 2010
147
Days with an AQI in 2010 (of 365)
In 2010, EPA reported a daily Air Quality Index (AQI) for Kenton, Kentucky on 147 days. 74 of those days (50%) were in the Good range, and the median daily AQI was 50. That median is higher than the typical monitored county in Kentucky (median 47.5 across 30 counties), and higher than the typical monitored U.S. county (44). The main pollutant was fine particles (PM2.5) on 106 days. Across the years with fuller monitoring, the share of Good days fell: an average of 78% in 1980–1982 versus 52% in 2008–2010.
EPA did not report an AQI for every day of 2010 here (147 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.
The most recent year with data for this county is 2010; EPA's files for 2011–2025 contain no row for it, which usually means its monitors stopped reporting.
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, 2010
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)
106
72%
Ozone
41
28%
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
2010
147
74
72
1
0
0
0
50
72
115
PM2.5
2009
363
203
154
6
0
0
0
47
67
119
PM2.5
2008
359
181
172
6
0
0
0
50
72
133
PM2.5
2007
365
119
213
31
2
0
0
57
99
169
PM2.5
2006
322
191
120
11
0
0
0
44
80
140
Ozone
2005
285
132
120
30
3
0
0
53
101
164
Ozone
2004
273
147
115
11
0
0
0
48
78
136
Ozone
2003
319
192
112
13
2
0
0
46
84
172
Ozone
2002
365
210
114
23
16
2
0
45
112
206
Ozone
2001
364
222
121
19
2
0
0
45
87
174
Ozone
2000
366
214
132
16
4
0
0
46
86
195
Ozone
1999
365
211
118
32
4
0
0
45
100
177
NO2
1998
365
259
70
26
9
1
0
38
100
203
NO2
1997
365
285
64
13
3
0
0
36
66
174
NO2
1996
366
271
68
22
5
0
0
39
90
200
NO2
1995
365
219
111
26
8
1
0
44
97
210
NO2
1994
365
253
82
17
13
0
0
42
97
195
NO2
1993
365
273
79
12
1
0
0
40
77
179
NO2
1992
366
304
54
8
0
0
0
35
61
147
Ozone
1991
365
309
38
15
3
0
0
29
64
169
CO
1990
365
295
48
15
6
1
0
32
80
204
CO
1989
364
282
54
19
9
0
0
31
84
187
CO
1988
366
240
50
24
35
17
0
34
169
253
Ozone
1987
365
245
61
29
26
4
0
36
133
217
Ozone
1986
365
273
57
22
12
1
0
36
97
203
CO
1985
356
273
61
18
3
1
0
37
87
202
CO
1984
363
263
64
28
8
0
0
42
100
192
CO
1983
365
254
59
29
22
1
0
39
126
205
CO
1982
365
277
58
18
12
0
0
38
87
192
Ozone
1981
365
281
51
22
11
0
0
38
84
179
Ozone
1980
366
301
43
7
15
0
0
34
71
187
CO
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 Kentucky with a similar median AQI in 2010
