Daily Air Quality Index summaries from EPA monitors in Rockwall, Texas, 1988–2025.
97%
Good days in 2025
31
Median daily AQI, 2025
2
Days above 100 in 2025
285
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Rockwall, Texas on 285 days. 276 of those days (97%) were in the Good range, and the median daily AQI was 31. That median is lower than the typical monitored county in Texas (median 43.5 across 44 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 285 days. Across the years with fuller monitoring, the share of Good days rose: an average of 74% in 2000–2002 versus 94% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (285 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 (1988) 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
285
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
285
276
7
2
0
0
0
31
45
108
Ozone
2024
340
315
23
2
0
0
0
34
49
126
Ozone
2023
342
320
22
0
0
0
0
34
47
100
Ozone
2022
360
339
21
0
0
0
0
34
47
100
Ozone
2021
360
343
17
0
0
0
0
31
45
87
Ozone
2020
363
345
17
1
0
0
0
32
45
133
Ozone
2019
323
305
16
2
0
0
0
34
47
105
Ozone
2018
304
281
18
5
0
0
0
31
49
136
Ozone
2017
309
285
23
1
0
0
0
35
48
105
Ozone
2016
360
331
29
0
0
0
0
35
49
77
Ozone
2015
364
309
48
7
0
0
0
36
64
140
Ozone
2014
360
314
45
1
0
0
0
36
54
105
Ozone
2013
361
300
52
9
0
0
0
39
67
119
Ozone
2012
365
289
64
10
1
1
0
39
74
204
Ozone
2011
361
272
72
16
1
0
0
40
84
164
Ozone
2010
363
305
53
5
0
0
0
37
64
150
Ozone
2009
361
289
67
3
2
0
0
38
71
182
Ozone
2008
354
304
44
6
0
0
0
37
61
122
Ozone
2007
363
307
49
7
0
0
0
35
67
140
Ozone
2006
360
272
63
24
1
0
0
39
90
151
Ozone
2005
357
257
69
31
0
0
0
39
97
143
Ozone
2004
364
286
59
17
2
0
0
37
84
169
Ozone
2003
364
277
66
20
1
0
0
40
87
151
Ozone
2002
365
289
56
17
3
0
0
35
84
177
Ozone
2001
361
270
70
20
1
0
0
39
84
156
Ozone
2000
142
95
24
18
5
0
0
33
112
185
Ozone
1988
116
46
40
22
7
1
0
67
136
217
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
