Daily Air Quality Index summaries from EPA monitors in Rutland, Vermont, 1984–2025.
78%
Good days in 2025
37
Median daily AQI, 2025
1
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Rutland, Vermont on 364 days. 283 of those days (78%) were in the Good range, and the median daily AQI was 37. That median is about the same as the typical monitored county in Vermont (median 37 across 3 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 238 days. Across the years with fuller monitoring, the share of Good days fell: an average of 97% in 1988–1990 versus 77% in 2023–2025.
Years with fewer than 120 monitored days (1984, 1985, 1986, 1987) 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
Ozone
238
65%
Fine particles (PM2.5)
126
35%
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
364
283
80
1
0
0
0
37
58
130
Ozone
2024
366
291
75
0
0
0
0
37
56
86
Ozone
2023
364
267
95
2
0
0
0
38
59
147
PM2.5
2022
365
278
87
0
0
0
0
39
57
74
PM2.5
2021
365
265
99
1
0
0
0
40
60
114
PM2.5
2020
366
283
83
0
0
0
0
39
56
97
PM2.5
2019
365
281
84
0
0
0
0
40
58
89
PM2.5
2018
365
264
101
0
0
0
0
39
62
90
PM2.5
2017
365
268
97
0
0
0
0
40
60
87
PM2.5
2016
366
290
76
0
0
0
0
38
58
89
Ozone
2015
365
225
137
3
0
0
0
40
69
121
PM2.5
2014
365
221
141
3
0
0
0
39
69
114
PM2.5
2013
362
202
157
3
0
0
0
46
72
128
PM2.5
2012
366
190
172
4
0
0
0
49
70
108
PM2.5
2011
365
159
200
6
0
0
0
52
75
116
PM2.5
2010
365
233
131
1
0
0
0
38
67
109
PM2.5
2009
365
219
144
2
0
0
0
42
71
125
PM2.5
2008
366
192
173
1
0
0
0
48
70
107
PM2.5
2007
363
305
58
0
0
0
0
24
58
89
NO2
2006
365
312
53
0
0
0
0
23
57
96
NO2
2005
365
302
61
2
0
0
0
26
59
107
NO2
2004
341
289
51
1
0
0
0
25
58
102
NO2
2003
268
227
39
2
0
0
0
29
60
105
NO2
2002
365
309
52
3
1
0
0
25
59
163
NO2
2001
363
295
66
2
0
0
0
27
58
105
NO2
2000
360
302
57
1
0
0
0
24
59
121
NO2
1999
350
292
57
1
0
0
0
25
57
119
NO2
1998
365
363
2
0
0
0
0
22
35
53
NO2
1997
365
363
2
0
0
0
0
23
35
69
NO2
1996
366
361
5
0
0
0
0
22
36
73
NO2
1995
365
359
6
0
0
0
0
25
37
67
NO2
1994
270
262
8
0
0
0
0
26
42
81
NO2
1993
365
359
6
0
0
0
0
23
39
57
NO2
1992
362
355
7
0
0
0
0
21
34
60
NO2
1991
362
354
8
0
0
0
0
23
38
69
NO2
1990
347
337
10
0
0
0
0
25
41
78
NO2
1989
306
295
11
0
0
0
0
26
41
79
NO2
1988
265
260
5
0
0
0
0
26
38
64
NO2
1987
49
47
2
0
0
0
0
29
47
65
PM10
1986
47
42
5
0
0
0
0
30
51
67
PM10
1985
55
53
2
0
0
0
0
25
39
57
PM10
1984
48
46
2
0
0
0
0
26
45
70
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 Vermont with a similar median AQI in 2025
