Daily Air Quality Index summaries from EPA monitors in Parker, Texas, 1988–2025.
82%
Good days in 2025
38
Median daily AQI, 2025
9
Days above 100 in 2025
346
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Parker, Texas on 346 days. 283 of those days (82%) were in the Good range, and the median daily AQI was 38. 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 ozone on 346 days. Across the years with fuller monitoring, the share of Good days rose: an average of 76% in 2000–2002 versus 84% in 2023–2025.
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
346
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
346
283
54
9
0
0
0
38
61
147
Ozone
2024
349
299
44
5
1
0
0
36
58
156
Ozone
2023
358
301
50
7
0
0
0
39
61
140
Ozone
2022
358
290
54
14
0
0
0
40
67
147
Ozone
2021
354
312
41
1
0
0
0
36
54
136
Ozone
2020
362
331
30
1
0
0
0
35
50
115
Ozone
2019
363
317
46
0
0
0
0
37
54
100
Ozone
2018
359
319
34
5
1
0
0
35
51
164
Ozone
2017
360
327
32
1
0
0
0
37
50
112
Ozone
2016
365
333
31
0
1
0
0
37
50
156
Ozone
2015
365
301
47
17
0
0
0
37
67
133
Ozone
2014
354
298
49
7
0
0
0
37
61
126
Ozone
2013
339
279
50
10
0
0
0
38
71
140
Ozone
2012
363
287
67
7
2
0
0
40
74
166
Ozone
2011
363
256
78
24
5
0
0
43
93
182
Ozone
2010
364
324
38
1
1
0
0
38
51
164
Ozone
2009
363
286
64
12
1
0
0
38
74
177
Ozone
2008
365
283
69
13
0
0
0
40
74
136
Ozone
2007
365
300
58
3
4
0
0
36
67
187
Ozone
2006
364
270
66
22
6
0
0
41
90
190
Ozone
2005
361
258
74
21
7
1
0
42
90
205
Ozone
2004
366
295
51
20
0
0
0
36
74
143
Ozone
2003
357
264
71
17
5
0
0
40
90
185
Ozone
2002
361
281
49
17
13
1
0
38
97
203
Ozone
2001
359
282
52
21
3
1
0
41
84
202
Ozone
2000
144
104
26
12
2
0
0
36
100
179
Ozone
1988
100
63
26
7
4
0
0
43
105
192
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
