Daily Air Quality Index summaries from EPA monitors in Dallas, Texas, 1980–2025.
41%
Good days in 2025
53
Median daily AQI, 2025
11
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 Dallas, Texas on 365 days. 148 of those days (41%) were in the Good range, and the median daily AQI was 53. That median is higher than the typical monitored county in Texas (median 43.5 across 44 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 209 days. Across the years with fuller monitoring, the share of Good days fell: an average of 53% in 1980–1982 versus 36% in 2023–2025.
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)
209
57%
Ozone
143
39%
Nitrogen dioxide (NO₂)
10
3%
Coarse particles (PM10)
3
1%
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
148
206
10
0
0
1
53
77
304
PM2.5
2024
366
129
218
16
3
0
0
55
84
185
PM2.5
2023
365
122
216
26
1
0
0
55
84
172
PM2.5
2022
365
164
184
17
0
0
0
52
74
148
PM2.5
2021
365
210
145
9
1
0
0
47
71
174
Ozone
2020
366
218
142
6
0
0
0
46
69
135
PM2.5
2019
365
156
203
6
0
0
0
52
74
143
PM2.5
2018
365
171
175
16
3
0
0
52
77
161
PM2.5
2017
365
161
197
7
0
0
0
52
71
140
PM2.5
2016
366
188
175
3
0
0
0
50
67
140
PM2.5
2015
365
169
186
10
0
0
0
52
77
147
PM2.5
2014
365
145
216
4
0
0
0
54
74
106
PM2.5
2013
365
80
264
20
1
0
0
57
90
154
PM2.5
2012
366
97
242
21
6
0
0
57
92
197
PM2.5
2011
365
114
224
20
7
0
0
57
93
182
PM2.5
2010
365
135
215
15
0
0
0
54
74
150
PM2.5
2009
365
124
218
19
4
0
0
55
90
182
PM2.5
2008
366
122
225
18
1
0
0
55
85
169
PM2.5
2007
365
115
236
12
2
0
0
55
77
179
PM2.5
2006
365
110
212
35
8
0
0
56
101
177
PM2.5
2005
365
87
208
52
18
0
0
60
126
197
PM2.5
2004
366
104
224
28
10
0
0
57
101
195
PM2.5
2003
365
76
243
35
9
2
0
61
109
226
PM2.5
2002
365
83
241
29
10
2
0
60
105
214
PM2.5
2001
365
67
264
30
3
1
0
60
98
207
PM2.5
2000
366
67
250
34
12
3
0
61
115
204
PM2.5
1999
365
124
191
25
22
3
0
58
122
213
Ozone
1998
365
226
80
41
17
1
0
44
129
222
Ozone
1997
365
237
82
34
11
1
0
43
112
208
Ozone
1996
366
233
99
24
7
3
0
44
100
212
Ozone
1995
365
229
88
23
19
6
0
45
129
221
Ozone
1994
365
249
83
27
6
0
0
43
100
179
Ozone
1993
365
283
57
17
7
1
0
39
87
220
Ozone
1992
366
251
88
20
6
1
0
46
93
217
Ozone
1991
365
252
83
22
7
1
0
43
90
205
Ozone
1990
365
248
71
26
18
2
0
44
108
217
Ozone
1989
365
223
105
28
8
1
0
47
101
205
Ozone
1988
366
177
119
45
21
4
0
54
133
206
Ozone
1987
365
202
97
50
14
2
0
47
122
239
Ozone
1986
365
192
114
38
18
3
0
48
122
217
Ozone
1985
365
187
109
41
19
9
0
49
143
234
Ozone
1984
366
183
105
51
21
6
0
51
136
229
Ozone
1983
365
192
98
40
27
8
0
47
140
227
Ozone
1982
365
203
104
31
18
9
0
47
136
232
Ozone
1981
365
171
126
38
23
7
0
54
140
229
Ozone
1980
365
205
95
37
17
11
0
47
136
224
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
