Skip to main content

Peak Daily One-Hour Ozone Averages for July 2025

The table below lists the peak daily one-hour ozone concentrations measured in July 2025 in each community where the TCEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight using AQI colors
AreaMonitoring SitePOCJuly 2025
1234
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 265603130
Keller C17258613530
Frisco C31/C680162664534
Denton Airport South C56/A163/X157151734135
Arlington Municipal Airport C61169432826
Dallas North No.2 C63/C679162583327
Rockwall Heath C69147472823
Grapevine Fairway C70/A301/X182157603329
Kaufman C71/A304/X071153453122
Granbury C73/C681150392625
Eagle Mountain Lake C75 154483430
Parker County C76149462825
Cleburne Airport C77/C682165472624
Dallas Executive Airport C402164483026
Greenville C1006/A198149543421
Pilot Point C1032156534735
Italy C1044/A323165502724
Corsicana Airport C1051159613728
AreaMonitoring SitePOCJuly 2025
1234
Tyler-Longview-Marshall
Longview C19/A127/C644251604136
Tyler Airport Relocated C82152553126
Karnack C85/AFHP303158433634
AreaMonitoring SitePOCJuly 2025
1234
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159147395653
Chamizal C41/AH126 140325852
Socorro Hueco C49/F312144335557
Skyline Park C72148335952
Ivanhoe C414/F514140305248
Ojo De Agua C1021/FG121/FG221150446054
AreaMonitoring SitePOCJuly 2025
1234
Waco
Waco Mazanec C1037137532324
Temple Georgia C1045132332020
Killeen Skylark Field C1047137352526
AreaMonitoring SitePOCJuly 2025
1234
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 231522933
West Orange C9/A141231714818
Port Arthur West C28/A128/A228124312917
Hamshire C64/C654130342014
SETRPC 40 Sabine Pass C640/C1654186531410
SETRPC 43 Jefferson Co Airport C643128402920
Nederland 17th Street C1035128443923
AreaMonitoring SitePOCJuly 2025
1234
Austin
Austin North Hills Drive C3/A322241342725
Audubon C38139322121
Dripping Springs School C6141 N36352426
CAPCOG Lake Georgetown C6901 N35271921
Lockhart C16041 N30252320
St. Edwards University C16051 N25231313
CAPCOG Bastrop CAMS16121 N29262422
CAPCOG Elgin C16131 N41271920
CAPCOG East Austin C16191 N36312322
CAPCOG Round Rock Brushy Creek W C16201 N41322824
CAPCOG Taylor Murphy Park C16291 N40342318
CAPCOG Lake Kyle Park C16301 N29282221
CAPCOG San Marcos Staples Road C16751 NNA292626
AreaMonitoring SitePOCJuly 2025
1234
Houston-Galveston-Brazoria
Houston East C1/G316289683418
Houston Aldine C8/AF108/X150 2851005528
Channelview C15/AH115 392683619
Northwest Harris Co. C26/A110/X154248713926
Hou.DeerPrk2 C35/235/1001/AFH139/FP239170473523
Seabrook Friendship Park C45171352619
Houston Bayland Park C53/A146 155393125
Conroe Relocated C78/A321161554537
Manvel Croix Park C84143292220
Clinton C403/C304/AH113 361402919
Houston North Wayside C405/C1033169753619
Houston Monroe C40615033NANA
Lang C408267453423
Houston Croquet C409248342923
Houston Westhollow C410/C300314722NANA
Park Place C416152303121
Houston Harvard Street C417160473727
Sheldon C5511 N68703914
Baytown Wetlands Center C5521 N84402819
Crosby Library C5531 N74805117
West Houston C5541 N62443220
Mercer Arboretum C5571 N731015131
Tom Bass C5581 N44292319
Katy Park C5591 N44382419
Atascocita C5601 N69805625
Meyer Park C5611 N731004224
Bunker Hill Village C5621 N53402821
Huffman Wolf Road C5631 NNA845221
Lynchburg Ferry C1015/A165 198543220
Lake Jackson C1016 146211820
Baytown Garth C1017187663726
Galveston 99th St. C1034/A320/X183154272322
AreaMonitoring SitePOCJuly 2025
1234
San Antonio
San Antonio Northwest C23236282517
Camp Bullis C58 134302716
Calaveras Lake C59127242322
Elm Creek Elementary C5011 N37323133
Fair Oaks Ranch C5021 N34312714
Bulverde Elementary C5031 N32282718
New Braunfels Airport C5041 N27262419
AACOG City of Garden Ridge C505 1 N27262317
Seguin Outdoor Learning Center C5061 N29312725
Heritage Middle School C6221 N32262425
CPS Pecan Valley C6781 N23191710
Government Canyon C16101 N31222214
AreaMonitoring SitePOCJuly 2025
1234
Corpus Christi-Victoria
Corpus Christi West C4224191924
Corpus Christi Tuloso C21119171722
Victoria C87129252021
AreaMonitoring SitePOCJuly 2025
1234
Lower Rio Grande Valley
Mission C43/AP143125171825
Harlingen Teege C1023124182225
AreaMonitoring SitePOCJuly 2025
1234
Laredo
Laredo College C441 N24212435
NA - Data not available.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 Not Defined
401 - 500 Not Defined Not Defined
500+ Not Defined Not Defined
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

PLEASE NOTE:  This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.