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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
12345678
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26560313030283841
Keller C1725861353030273639
Frisco C31/C68016266453435334656
Denton Airport South C56/A163/X15715173413526294043
Arlington Municipal Airport C6116943282628243240
Dallas North No.2 C63/C67916258332727263741
Rockwall Heath C6914747282327252836
Grapevine Fairway C70/A301/X18215760332925274043
Kaufman C71/A304/X07115345312228263333
Granbury C73/C68115039262524253035
Eagle Mountain Lake C75 15448343030253638
Parker County C7614946282526243734
Cleburne Airport C77/C68216547262424213039
Dallas Executive Airport C40216448302627262841
Greenville C1006/A198149543421243033NA
Pilot Point C103215653473531334648
Italy C1044/A32316550272429252942
Corsicana Airport C105115961372831293332
AreaMonitoring SitePOCJuly 2025
12345678
Tyler-Longview-Marshall
Longview C19/A127/C64425160413626392940
Tyler Airport Relocated C8215255312629282942
Karnack C85/AFHP30315843363428454231
AreaMonitoring SitePOCJuly 2025
12345678
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914739565348565556
Chamizal C41/AH126 14032585247544954
Socorro Hueco C49/F31214433555746554952
Skyline Park C7214833595247575756
Ivanhoe C414/F51414030524842524447
Ojo De Agua C1021/FG121/FG22115044605450696467
AreaMonitoring SitePOCJuly 2025
12345678
Waco
Waco Mazanec C103713753232427313435
Temple Georgia C104513233202022243832
Killeen Skylark Field C104713735252633303813
AreaMonitoring SitePOCJuly 2025
12345678
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 23152293333462535
West Orange C9/A14123171481835322431
Port Arthur West C28/A128/A22812431291723272328
Hamshire C64/C65413034201418212327
SETRPC 40 Sabine Pass C640/C165418653141015556124
SETRPC 43 Jefferson Co Airport C64312840292025352433
Nederland 17th Street C103512844392327332434
AreaMonitoring SitePOCJuly 2025
12345678
Austin
Austin North Hills Drive C3/A32224134272527313334
Audubon C3813932212118212734
Dripping Springs School C6141 N3635242625323440
CAPCOG Lake Georgetown C6901 N3527192120222826
Lockhart C16041 N3025232014172623
St. Edwards University C16051 N2523131313171922
CAPCOG Bastrop CAMS16121 N2926242223252628
CAPCOG Elgin C16131 N4127192028262631
CAPCOG East Austin C16191 N3631232224323341
CAPCOG Round Rock Brushy Creek W C16201 N413228242922NA30
CAPCOG Taylor Murphy Park C16291 N4034231828262634
CAPCOG Lake Kyle Park C16301 N2928222125332936
CAPCOG San Marcos Staples Road C16751 NNA29262623273137
AreaMonitoring SitePOCJuly 2025
12345678
Houston-Galveston-Brazoria
Houston East C1/G31628968341822232928
Houston Aldine C8/AF108/X150 285100552832373738
Channelview C15/AH115 39268361924323428
Northwest Harris Co. C26/A110/X15424871392630293027
Hou.DeerPrk2 C35/235/1001/AFH139/FP23917047352323283228
Seabrook Friendship Park C4517135261920242224
Houston Bayland Park C53/A146 15539312529243025
Conroe Relocated C78/A32116155453738504925
Manvel Croix Park C8414329222022192523
Clinton C403/C304/AH113 36140291922242319
Houston North Wayside C405/C103316975361922252925
Houston Monroe C40615033NANANANA2622
Lang C40826745342325212926
Houston Croquet C40924834292325232824
Houston Westhollow C410/C300314722NANANANA2324
Park Place C41615230312125212825
Houston Harvard Street C41716047372727233133
Sheldon C5511 N6870391422272625
Baytown Wetlands Center C5521 N8440281921222126
Crosby Library C5531 N7480511728303532
West Houston C5541 N6244322024262725
Mercer Arboretum C5571 N73101513131443926
Tom Bass C5581 N4429231922182823
Katy Park C5591 N4438241925232422
Atascocita C5601 N6980562524353622
Meyer Park C5611 N73100422427353325
Bunker Hill Village C5621 N5340282125202521
Huffman Wolf Road C5631 NNA84522133354930
Lynchburg Ferry C1015/A165 19854322024273128
Lake Jackson C1016 14621182021162322
Baytown Garth C101718766372628282840
Galveston 99th St. C1034/A320/X18315427232222213435
Oyster Creek C1607 1 N442221222219NANA
AreaMonitoring SitePOCJuly 2025
12345678
San Antonio
San Antonio Northwest C2323628251716303433
Camp Bullis C58 13430271614303734
Calaveras Lake C5912724232217282831
Elm Creek Elementary C5011 N3732313313352832
Fair Oaks Ranch C5021 N3431271412263431
Bulverde Elementary C5031 N3228271822313934
New Braunfels Airport C5041 N2726241915232626
AACOG City of Garden Ridge C505 1 N2726231718302933
Seguin Outdoor Learning Center C5061 N2931272521283332
Heritage Middle School C6221 N3226242519303133
CPS Pecan Valley C6781 N231917106202223
Government Canyon C16101 N3122221414252933
AreaMonitoring SitePOCJuly 2025
12345678
Corpus Christi-Victoria
Corpus Christi West C422419192423182025
Corpus Christi Tuloso C2111917172221212223
Victoria C8712925202122242430
AreaMonitoring SitePOCJuly 2025
12345678
Lower Rio Grande Valley
Mission C43/AP14312517182520262220
Harlingen Teege C102312418222524262323
AreaMonitoring SitePOCJuly 2025
12345678
Laredo
Laredo College C441 N2421243531333033
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.