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Daily Maximum Eight-Hour Ozone Averages for July 2025

The table below lists the peak daily maximum eight-hour ozone concentrations measured in July 2025 in each community where the TCEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCJuly 2025
12345
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26149272524
Keller C1725554292525
Frisco C31/C68015950362828
Denton Airport South C56/A163/X15714952322723
Arlington Municipal Airport C6116441242324
Dallas North No.2 C63/C67915445282219
Rockwall Heath C6914540251923
Grapevine Fairway C70/A301/X18215148262422
Kaufman C71/A304/X07115140272025
Granbury C73/C68114535222222
Eagle Mountain Lake C75 14942282525
Parker County C7614538242324
Cleburne Airport C77/C68215342232021
Dallas Executive Airport C40215840262222
Greenville C1006/A19814642271822
Pilot Point C103215245372927
Italy C1044/A32315439242023
Corsicana Airport C105115747312428
AreaMonitoring SitePOCJuly 2025
12345
Tyler-Longview-Marshall
Longview C19/A127/C64424956372822
Tyler Airport Relocated C8214950272325
Karnack C85/AFHP30314838313025
AreaMonitoring SitePOCJuly 2025
12345
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914531505147
Chamizal C41/AH126 13827495143
Socorro Hueco C49/F31214229505245
Skyline Park C7214430515045
Ivanhoe C414/F51413625464640
Ojo De Agua C1021/FG121/FG2211NV35545247
AreaMonitoring SitePOCJuly 2025
12345
Waco
Waco Mazanec C103713446202025
Temple Georgia C104512926171719
Killeen Skylark Field C104713230222127
AreaMonitoring SitePOCJuly 2025
12345
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 22843242325
West Orange C9/A14122655381625
Port Arthur West C28/A128/A22812127191520
Hamshire C64/C65412730161116
SETRPC 40 Sabine Pass C640/C16541281810813
SETRPC 43 Jefferson Co Airport C64312533221721
Nederland 17th Street C103512635241822
AreaMonitoring SitePOCJuly 2025
12345
Austin
Austin North Hills Drive C3/A32223629222124
Audubon C3813326151416
Dripping Springs School C6141 N3130191920
CAPCOG Lake Georgetown C6901 N3223151417
Lockhart C16041 N2622161812
St. Edwards University C16051 N221811910
CAPCOG Bastrop CAMS16121 N2623181819
CAPCOG Elgin C16131 N3224171820
CAPCOG East Austin C16191 NNVNV191921
CAPCOG Round Rock Brushy Creek W C16201 N36NV201823
CAPCOG Taylor Murphy Park C16291 N3127171622
CAPCOG Lake Kyle Park C16301 N2524181617
CAPCOG San Marcos Staples Road C16751 NNANV222221
AreaMonitoring SitePOCJuly 2025
12345
Houston-Galveston-Brazoria
Houston East C1/G31625443221720
Houston Aldine C8/AF108/X150 26362252327
Channelview C15/AH115 36349231721
Northwest Harris Co. C26/A110/X15424155NV2326
Hou.DeerPrk2 C35/235/1001/AFH139/FP23915437242021
Seabrook Friendship Park C4514929181718
Houston Bayland Park C53/A146 14933172424
Conroe Relocated C78/A321143NV312632
Manvel Croix Park C8413623161819
Clinton C403/C304/AH113 34631161720
Houston North Wayside C405/C103315745181619
Houston Monroe C406138NVNANANA
Lang C40825335202120
Houston Croquet C40924127182122
Houston Westhollow C410/C3003143NVNANANA
Park Place C416145NV212021
Houston Harvard Street C41715237232324
Sheldon C5511 NNV45231218
Baytown Wetlands Center C5521 N6232181619
Crosby Library C5531 NNV47301225
West Houston C5541 N4735201821
Mercer Arboretum C5571 N5767262427
Tom Bass C5581 N3723181719
Katy Park C5591 N3930171619
Atascocita C5601 N5253281622
Meyer Park C5611 N5164242224
Bunker Hill Village C5621 N4630191921
Huffman Wolf Road C5631 NNANV351630
Lynchburg Ferry C1015/A165 16840201822
Lake Jackson C1016 13318161919
Baytown Garth C101716146272026
Galveston 99th St. C1034/A320/X18314423212020
AreaMonitoring SitePOCJuly 2025
12345
San Antonio
San Antonio Northwest C2323223231213
Camp Bullis C58 13022241111
Calaveras Lake C5912519211912
Elm Creek Elementary C5011 N252522158
Fair Oaks Ranch C5021 N3124251110
Bulverde Elementary C5031 N2822241515
New Braunfels Airport C5041 N2421211612
AACOG City of Garden Ridge C505 1 N2621221616
Seguin Outdoor Learning Center C5061 N2724242218
Heritage Middle School C6221 N2422212115
CPS Pecan Valley C6781 N21111574
Government Canyon C16101 N2720201011
AreaMonitoring SitePOCJuly 2025
12345
Corpus Christi-Victoria
Corpus Christi West C421917172222
Corpus Christi Tuloso C2111715161920
Victoria C8712322172021
AreaMonitoring SitePOCJuly 2025
12345
Lower Rio Grande Valley
Mission C43/AP14312014162319
Harlingen Teege C102311915202322
AreaMonitoring SitePOCJuly 2025
12345
Laredo
Laredo College C441 N2119223128
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.