Daily Air Quality Index summaries from EPA monitors in Ector, Texas, 1980–2025.
72%
Good days in 2025
39
Median daily AQI, 2025
2
Days above 100 in 2025
358
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Ector, Texas on 358 days. 259 of those days (72%) were in the Good range, and the median daily AQI was 39. That median is lower than the typical monitored county in Texas (median 43.5 across 44 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 358 days. Across the years with fuller monitoring, the share of Good days fell: an average of 83% in 1980–1982 versus 77% in 2023–2025.
Years with fewer than 120 monitored days (1991, 1995, 1996, 1999, 2000, 2001…) 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
Fine particles (PM2.5)
358
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
358
259
97
0
2
0
0
39
58
183
PM2.5
2024
356
280
76
0
0
0
0
36
56
88
PM2.5
2023
355
285
70
0
0
0
0
33
56
84
PM2.5
2022
360
266
94
0
0
0
0
37
58
94
PM2.5
2021
349
269
80
0
0
0
0
35
56
91
PM2.5
2020
346
271
75
0
0
0
0
36
57
96
PM2.5
2019
354
251
103
0
0
0
0
38
56
82
PM2.5
2018
337
229
108
0
0
0
0
40
58
92
PM2.5
2017
350
290
60
0
0
0
0
35
53
94
PM2.5
2016
365
290
74
1
0
0
0
36
56
102
PM2.5
2015
365
255
110
0
0
0
0
39
57
76
PM2.5
2014
365
233
132
0
0
0
0
43
61
88
PM2.5
2013
365
254
110
1
0
0
0
41
58
112
PM2.5
2012
366
190
176
0
0
0
0
49
60
81
PM2.5
2011
365
181
180
4
0
0
0
51
67
130
PM2.5
2010
365
269
96
0
0
0
0
41
56
72
PM2.5
2009
365
248
117
0
0
0
0
41
56
81
PM2.5
2008
366
229
136
1
0
0
0
44
59
115
PM2.5
2007
365
222
143
0
0
0
0
42
59
78
PM2.5
2006
365
230
135
0
0
0
0
45
57
70
PM2.5
2005
365
228
137
0
0
0
0
42
60
87
PM2.5
2004
124
86
38
0
0
0
0
39
58
75
PM2.5
2003
123
87
36
0
0
0
0
40
59
82
PM2.5
2002
123
88
35
0
0
0
0
40
58
79
PM2.5
2001
107
77
30
0
0
0
0
37
55
72
PM2.5
2000
56
44
12
0
0
0
0
42
59
67
PM2.5
1999
36
22
14
0
0
0
0
44
58
64
PM2.5
1996
58
56
2
0
0
0
0
20
41
86
PM10
1995
15
14
1
0
0
0
0
15
35
54
PM10
1991
34
34
0
0
0
0
0
19
28
46
PM10
1990
54
53
1
0
0
0
0
17
28
58
PM10
1989
48
45
3
0
0
0
0
20
45
69
PM10
1988
102
97
5
0
0
0
0
21
39
77
PM10
1987
156
150
6
0
0
0
0
19
32
61
PM10
1986
315
263
51
1
0
0
0
37
67
101
Ozone
1985
122
119
3
0
0
0
0
25
41
54
PM10
1984
358
294
51
12
1
0
0
37
71
174
Ozone
1983
353
286
57
9
1
0
0
38
67
151
Ozone
1982
331
288
40
2
1
0
0
38
57
187
Ozone
1981
351
297
48
6
0
0
0
38
58
122
Ozone
1980
340
261
68
10
1
0
0
42
74
164
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.
Counties in Texas with a similar median AQI in 2025
