Daily Air Quality Index summaries from EPA monitors in Pittsburg, Oklahoma, 1998–2025.
57%
Good days in 2025
48
Median daily AQI, 2025
3
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 Pittsburg, Oklahoma on 365 days. 207 of those days (57%) were in the Good range, and the median daily AQI was 48. That median is higher than the typical monitored county in Oklahoma (median 44 across 19 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 216 days. Across the years with fuller monitoring, the share of Good days fell: an average of 66% in 2002–2004 versus 56% in 2023–2025.
Years with fewer than 120 monitored days (1998, 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)
216
59%
Ozone
149
41%
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
207
155
3
0
0
0
48
64
140
PM2.5
2024
362
198
162
2
0
0
0
48
65
105
PM2.5
2023
355
196
152
7
0
0
0
49
69
119
PM2.5
2022
348
208
136
4
0
0
0
47
63
139
PM2.5
2021
360
176
180
4
0
0
0
51
66
117
PM2.5
2020
366
230
135
1
0
0
0
44
60
141
PM2.5
2019
365
220
143
2
0
0
0
46
62
105
Ozone
2018
363
232
130
1
0
0
0
46
68
108
PM2.5
2017
357
233
124
0
0
0
0
44
61
100
PM2.5
2016
366
258
108
0
0
0
0
43
59
85
PM2.5
2015
365
260
105
0
0
0
0
41
58
100
PM2.5
2014
355
196
159
0
0
0
0
47
63
93
PM2.5
2013
363
180
176
7
0
0
0
51
71
108
PM2.5
2012
366
126
229
11
0
0
0
56
79
147
PM2.5
2011
365
126
215
22
2
0
0
57
90
156
PM2.5
2010
365
158
206
1
0
0
0
53
70
101
PM2.5
2009
365
148
216
1
0
0
0
53
71
104
PM2.5
2008
366
283
83
0
0
0
0
40
62
97
Ozone
2007
356
245
105
6
0
0
0
41
70
129
Ozone
2006
365
231
117
17
0
0
0
44
84
143
Ozone
2005
357
228
124
5
0
0
0
45
77
115
Ozone
2004
364
262
99
3
0
0
0
40
66
105
Ozone
2003
363
240
115
8
0
0
0
43
69
129
Ozone
2002
235
142
85
8
0
0
0
43
72
136
Ozone
2001
114
49
64
1
0
0
0
53
70
128
PM2.5
2000
115
59
56
0
0
0
0
50
67
93
PM2.5
1999
69
25
44
0
0
0
0
55
74
94
PM2.5
1998
9
9
0
0
0
0
0
34
46
46
PM10
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 Oklahoma with a similar median AQI in 2025
