Daily Air Quality Index summaries from EPA monitors in Culberson, Texas, 1987–2025.
63%
Good days in 2022
41
Median daily AQI, 2022
4
Days above 100 in 2022
175
Days with an AQI in 2022 (of 365)
In 2022, EPA reported a daily Air Quality Index (AQI) for Culberson, Texas on 175 days. 111 of those days (63%) were in the Good range, and the median daily AQI was 41. That median is lower than the typical monitored county in Texas (median 44 across 45 counties), and about the same as the typical monitored U.S. county (41). The main pollutant was fine particles (PM2.5) on 97 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 66% in 1987–1989 versus 68% in 2020–2022.
EPA did not report an AQI for every day of 2022 here (175 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.
Years with fewer than 120 monitored days (2016, 2017, 2018, 2023, 2024, 2025…) 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, 2022
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)
97
55%
Ozone
78
45%
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
88
67
19
1
1
0
0
32
67
159
PM2.5
2024
111
99
12
0
0
0
0
26
52
88
PM2.5
2023
107
101
6
0
0
0
0
20
44
89
PM2.5
2022
175
111
60
4
0
0
0
41
80
119
PM2.5
2021
221
170
47
4
0
0
0
43
64
126
Ozone
2020
201
125
69
7
0
0
0
46
80
112
Ozone
2019
176
153
21
2
0
0
0
36
52
108
Ozone
2018
115
89
26
0
0
0
0
31
54
81
PM2.5
2017
116
109
5
2
0
0
0
22
44
114
PM2.5
2016
113
111
2
0
0
0
0
19
36
53
PM2.5
2015
113
109
4
0
0
0
0
21
41
66
PM2.5
2014
107
93
14
0
0
0
0
26
53
72
PM2.5
2013
101
85
14
2
0
0
0
28
54
120
PM2.5
2012
118
114
3
1
0
0
0
27
43
136
PM2.5
2011
111
92
17
2
0
0
0
28
55
119
PM2.5
2010
113
108
5
0
0
0
0
18
37
72
PM2.5
2009
111
108
3
0
0
0
0
21
40
52
PM2.5
2008
121
112
9
0
0
0
0
23
46
73
PM2.5
2007
110
104
6
0
0
0
0
22
45
63
PM2.5
2006
115
110
5
0
0
0
0
21
39
59
PM2.5
2005
114
108
6
0
0
0
0
21
42
79
PM2.5
2004
105
100
5
0
0
0
0
19
42
75
PM2.5
2003
109
97
10
2
0
0
0
24
53
112
PM2.5
2002
118
102
15
0
1
0
0
24
53
152
PM2.5
2001
110
98
12
0
0
0
0
26
51
70
PM2.5
2000
101
88
13
0
0
0
0
27
52
62
PM2.5
1999
100
87
11
2
0
0
0
29
52
140
PM2.5
1998
100
83
17
0
0
0
0
27
54
77
PM2.5
1997
99
87
12
0
0
0
0
27
53
61
PM2.5
1996
96
81
15
0
0
0
0
29
54
74
PM2.5
1995
95
85
10
0
0
0
0
27
51
57
PM2.5
1994
87
80
7
0
0
0
0
27
48
82
PM2.5
1993
100
94
6
0
0
0
0
22
43
58
PM2.5
1992
283
217
65
1
0
0
0
44
67
101
Ozone
1991
201
176
25
0
0
0
0
38
51
87
Ozone
1990
316
276
39
1
0
0
0
41
51
101
Ozone
1989
305
237
68
0
0
0
0
42
64
90
Ozone
1988
315
260
46
6
3
0
0
43
58
172
Ozone
1987
133
52
71
8
0
2
0
58
100
220
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.
