Daily Air Quality Index summaries from EPA monitors in Pueblo, Colorado, 1980–2025.
73%
Good days in 2025
45
Median daily AQI, 2025
1
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 Pueblo, Colorado on 365 days. 268 of those days (73%) were in the Good range, and the median daily AQI was 45. That median is about the same as the typical monitored county in Colorado (median 46 across 27 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 281 days. Across the years with fuller monitoring, the share of Good days fell: an average of 99% in 1980–1982 versus 73% in 2023–2025.
Years with fewer than 120 monitored days (1995, 1996, 1997, 1998, 1999, 2020…) 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
281
77%
Fine particles (PM2.5)
69
19%
Coarse particles (PM10)
15
4%
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
268
96
1
0
0
0
45
64
101
Ozone
2024
366
249
109
8
0
0
0
44
74
143
Ozone
2023
362
277
84
1
0
0
0
43
67
115
Ozone
2022
349
317
29
3
0
0
0
21
48
121
PM10
2021
220
203
16
1
0
0
0
23
48
138
PM10
2020
96
84
12
0
0
0
0
22
52
67
PM2.5
2019
126
125
1
0
0
0
0
26
40
68
PM2.5
2018
123
108
14
1
0
0
0
29
51
101
PM2.5
2017
125
113
10
2
0
0
0
26
49
108
PM2.5
2016
128
121
7
0
0
0
0
26
44
64
PM2.5
2015
129
120
9
0
0
0
0
25
43
95
PM2.5
2014
124
110
13
1
0
0
0
28
52
110
PM2.5
2013
127
112
15
0
0
0
0
29
53
92
PM2.5
2012
133
116
17
0
0
0
0
31
52
82
PM2.5
2011
126
114
12
0
0
0
0
27
49
82
PM2.5
2010
142
128
14
0
0
0
0
31
48
70
PM2.5
2009
201
143
58
0
0
0
0
45
66
90
Ozone
2008
142
109
33
0
0
0
0
36
55
83
PM2.5
2007
128
100
28
0
0
0
0
36
55
73
PM2.5
2006
129
82
47
0
0
0
0
44
59
70
PM2.5
2005
124
97
27
0
0
0
0
37
53
67
PM2.5
2004
125
105
20
0
0
0
0
34
54
71
PM2.5
2003
128
98
30
0
0
0
0
38
55
94
PM2.5
2002
129
98
31
0
0
0
0
38
55
79
PM2.5
2001
125
87
38
0
0
0
0
43
57
87
PM2.5
2000
126
98
28
0
0
0
0
39
57
81
PM2.5
1999
118
105
13
0
0
0
0
30
52
59
PM10
1998
84
83
1
0
0
0
0
21
34
53
PM10
1997
57
54
3
0
0
0
0
23
38
67
PM10
1996
52
51
1
0
0
0
0
21
39
53
PM10
1995
51
48
3
0
0
0
0
20
42
73
PM10
1994
54
53
1
0
0
0
0
26
42
55
PM10
1993
54
54
0
0
0
0
0
23
35
48
PM10
1992
57
56
1
0
0
0
0
22
43
54
PM10
1991
57
55
2
0
0
0
0
26
43
55
PM10
1990
50
49
1
0
0
0
0
23
41
61
PM10
1989
60
54
6
0
0
0
0
27
51
65
PM10
1988
62
55
7
0
0
0
0
28
51
59
PM10
1987
15
12
3
0
0
0
0
32
54
56
PM10
1985
304
303
1
0
0
0
0
13
26
62
CO
1984
358
350
8
0
0
0
0
10
26
71
CO
1983
267
266
1
0
0
0
0
13
22
72
CO
1982
356
354
2
0
0
0
0
13
26
65
CO
1981
336
336
0
0
0
0
0
14
26
49
CO
1980
327
315
12
0
0
0
0
17
31
69
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 Colorado with a similar median AQI in 2025
