Daily Air Quality Index summaries from EPA monitors in Josephine, Oregon, 1981–2025.
68%
Good days in 2025
33
Median daily AQI, 2025
8
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 Josephine, Oregon on 365 days. 249 of those days (68%) were in the Good range, and the median daily AQI was 33. That median is higher than the typical monitored county in Oregon (median 29 across 21 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 365 days. Across the years with fuller monitoring, the share of Good days rose: an average of 51% in 1981–1983 versus 67% 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
Fine particles (PM2.5)
365
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
365
249
108
6
1
1
0
33
67
208
PM2.5
2024
366
284
74
8
0
0
0
29
60
146
PM2.5
2023
365
205
129
10
11
7
3
44
83
872
PM2.5
2022
365
208
142
8
6
1
0
39
83
252
PM2.5
2021
365
240
106
10
9
0
0
36
75
188
PM2.5
2020
366
228
112
4
14
1
7
35
76
763
PM2.5
2019
365
251
109
3
2
0
0
34
68
175
PM2.5
2018
363
195
129
17
21
1
0
47
112
210
PM2.5
2017
365
219
125
5
8
6
2
42
80
415
PM2.5
2016
366
286
80
0
0
0
0
38
59
87
PM2.5
2015
365
241
118
4
2
0
0
37
69
171
PM2.5
2014
365
264
99
2
0
0
0
31
62
120
PM2.5
2013
365
190
156
6
7
4
2
49
84
450
PM2.5
2012
366
277
89
0
0
0
0
31
59
80
PM2.5
2011
365
261
103
1
0
0
0
28
65
106
PM2.5
2010
365
287
77
1
0
0
0
29
57
103
PM2.5
2009
365
235
126
4
0
0
0
37
67
148
PM2.5
2008
366
216
145
4
1
0
0
42
70
154
PM2.5
2007
365
232
133
0
0
0
0
38
74
97
PM2.5
2006
365
201
162
2
0
0
0
45
69
105
PM2.5
2005
365
232
131
1
1
0
0
38
66
164
PM2.5
2004
366
230
135
1
0
0
0
38
67
107
PM2.5
2003
243
215
27
1
0
0
0
26
52
127
CO
2002
243
184
58
1
0
0
0
31
67
110
CO
2001
244
196
43
5
0
0
0
32
61
149
PM2.5
2000
272
233
39
0
0
0
0
29
58
99
PM2.5
1999
217
190
27
0
0
0
0
30
55
89
CO
1998
212
205
7
0
0
0
0
31
44
54
CO
1997
234
223
11
0
0
0
0
28
45
68
CO
1996
232
211
21
0
0
0
0
34
50
70
CO
1995
250
219
31
0
0
0
0
35
52
78
CO
1994
237
204
33
0
0
0
0
38
54
72
CO
1993
240
175
65
0
0
0
0
40
63
83
CO
1992
233
157
76
0
0
0
0
43
65
89
CO
1991
238
141
97
0
0
0
0
45
72
98
CO
1990
238
138
99
1
0
0
0
47
71
108
CO
1989
245
122
122
1
0
0
0
51
79
103
CO
1988
366
233
130
3
0
0
0
42
74
123
CO
1987
364
191
166
6
1
0
0
49
84
157
CO
1986
363
205
156
2
0
0
0
47
79
116
CO
1985
359
205
142
12
0
0
0
45
83
138
CO
1984
364
192
161
9
2
0
0
49
87
158
CO
1983
363
194
158
11
0
0
0
49
85
148
CO
1982
363
185
149
27
2
0
0
50
97
183
CO
1981
363
176
170
17
0
0
0
51
90
136
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 Oregon with a similar median AQI in 2025
