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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
12345678910111213
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26149272525243037643734NVNA
Keller C172555429252624313657363330NA
Frisco C31/C68015950362828293949705036NVNA
Denton Airport South C56/A163/X15714952322723243539684236NVNA
Arlington Municipal Airport C6116441242325212732513329NVNA
Dallas North No.2 C63/C67915445282221233038533928NVNA
Rockwall Heath C6914540251924232633413824NVNA
Grapevine Fairway C70/A301/X18215148262423233340714232NVNA
Kaufman C71/A304/X07115140272025242629333927NVNA
Granbury C73/C68114535222222202529513031NVNA
Eagle Mountain Lake C75 14942282526213034503633NVNA
Parker County C7614538242324202931543428NVNA
Cleburne Airport C77/C6821534223202118243145NV31NVNA
Dallas Executive Airport C40215840262223222533403227NVNA
Greenville C1006/A198146422718222824NANV4126NVNA
Pilot Point C103215245372927294042725039NVNA
Italy C1044/A32315439242025222629323726NVNA
Corsicana Airport C105115747312428273029NVNVNVNVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Tyler-Longview-Marshall
Longview C19/A127/C64424956372822342828263726NVNA
Tyler Airport Relocated C8214950272327252731324227NVNA
Karnack C85/AFHP30314838313025353328293725NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914531505146544849466348NVNA
Chamizal C41/AH126 13827495144504143404747NVNA
Socorro Hueco C49/F31214229505245514746466754NVNA
Skyline Park C7214430515048535151476347NVNA
Ivanhoe C414/F51413625464642454142405944NVNA
Ojo De Agua C1021/FG121/FG2211NV355452586058NVNVNV48NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Waco
Waco Mazanec C103713446202025252830334130NVNA
Temple Georgia C104512926171720202930313929NVNA
Killeen Skylark Field C1047132302221272531NVNA3532NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 22843242325302328313122NVNA
West Orange C9/A14122655381626282226NANV20NVNA
Port Arthur West C28/A128/A22812127191520222222242020NVNA
Hamshire C64/C654127301611171720222522NVNVNA
SETRPC 40 Sabine Pass C640/C16541281810813152120172322NVNA
SETRPC 43 Jefferson Co Airport C64312533221721262227282319NVNA
Nederland 17th Street C103512635241822272227282420NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Austin
Austin North Hills Drive C3/A3222362922212426293125NV29NVNA
Audubon C3813326151416182330283427NVNA
Dripping Springs School C6141 N3130191920253034263729NVNA
CAPCOG Lake Georgetown C6901 N3223151417182424252824NVNA
Lockhart C16041 N26221618NVNV2019223023NVNA
St. Edwards University C16051 N22181191015161917252021NA
CAPCOG Bastrop CAMS16121 N2623181819212323253126NVNA
CAPCOG Elgin C16131 N3224171820242125253226NVNA
CAPCOG East Austin C16191 NNVNV191921282933NV3630NVNA
CAPCOG Round Rock Brushy Creek W C16201 N36NV201823NVNANV3036NVNVNA
CAPCOG Taylor Murphy Park C16291 N3127171622242326313528NVNA
CAPCOG Lake Kyle Park C16301 N2524181617232627253125NVNA
CAPCOG San Marcos Staples Road C16751 NNANV222221252629273126NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Houston-Galveston-Brazoria
Houston East C1/G31625443221720202520252619NVNA
Houston Aldine C8/AF108/X150 26362252327302826323424NVNA
Channelview C15/AH115 36349231721262823293323NVNA
Northwest Harris Co. C26/A110/X15424155NV2327272623263125NVNA
Hou.DeerPrk2 C35/235/1001/AFH139/FP23915437242021232722282622NVNA
Seabrook Friendship Park C4514929181719201919222119NVNA
Houston Bayland Park C53/A146 14933172424212520262723NVNA
Conroe Relocated C78/A321143NV312632433622253431NVNA
Manvel Croix Park C8413623161820162218232018NVNA
Clinton C403/C304/AH113 34631161720192014191914NVNA
Houston North Wayside C405/C103315745181619202117NV2413NVNA
Houston Monroe C40613825NANANANANV18222117NVNA
Lang C40825335202120191919262520NVNA
Houston Croquet C40924127182122192219232221NVNA
Houston Westhollow C410/C3003143NVNANANANANV22272420NVNA
Park Place C416145NV212021182519252419NVNA
Houston Harvard Street C4171523723232422262530NVNVNVNA
Sheldon C5511 NNV452312172121NVNANV16NVNA
Baytown Wetlands Center C5521 N6232181618191918262017NVNA
Crosby Library C5531 NNV47301224232923263120NVNA
West Houston C5541 N4735201821212220262619NVNA
Mercer Arboretum C5571 N5767262427352921243225NVNA
Tom Bass C5581 N3723181719162417212220NVNA
Katy Park C5591 N3930171620191920222119NVNA
Atascocita C5601 N5253281621282518213018NVNA
Meyer Park C5611 N5164242224252622253022NVNA
Bunker Hill Village C5621 N4630191920171816202118NVNA
Huffman Wolf Road C5631 NNANV3516292835252838NANANA
Lynchburg Ferry C1015/A165 16840201822222721242422NVNA
Lake Jackson C1016 1331816191915212019192023NA
Baytown Garth C101716146272026252628333324NVNA
Galveston 99th St. C1034/A320/X18314423212020203331292223NVNA
Oyster Creek C1607 1 N3320202021NVNANANANANANANA
AreaMonitoring SitePOCJuly 2025
12345678910111213
San Antonio
San Antonio Northwest C2323223231213253130313228NVNA
Camp Bullis C58 13022241112253131313328NVNA
Calaveras Lake C5912519211914242627283225NVNA
Elm Creek Elementary C5011 N25252215814222831332629NA
Fair Oaks Ranch C5021 N312425111022292730332932NA
Bulverde Elementary C5031 N282224151525312935383234NA
New Braunfels Airport C5041 N242121161220222325282123NA
AACOG City of Garden Ridge C505 1 N262122161627252930332628NA
Seguin Outdoor Learning Center C5061 N272424221826282729352627NA
Heritage Middle School C6221 N242221211623282933352727NA
CPS Pecan Valley C6781 N2111157518181922252020NA
Government Canyon C16101 N272020101121253031343033NA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Corpus Christi-Victoria
Corpus Christi West C421917172222171717232519NVNA
Corpus Christi Tuloso C2111715161920191917232620NVNA
Victoria C87123221720212121NV25272221NA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Lower Rio Grande Valley
Mission C43/AP14312014162319231917292423NVNA
Harlingen Teege C102311915202322242121312423NVNA
AreaMonitoring SitePOCJuly 2025
12345678910111213
Laredo
Laredo College C441 N2119223128312929303130NVNA
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.