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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 2025POCMonitoring Site
123456789101112131415161718
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26149272525243037643734304746323443422Ft. Worth Northwest C13/AH302
Keller C1725554292526243136573633304648323441432Keller C17
Frisco C31/C68015950362828293949705036395257394057611Frisco C31/C680
Denton Airport South C56/A163/X15714952322723243539684236324851353852521Denton Airport South C56/A163/X157
Arlington Municipal Airport C6116441242325212732513329303637283034351Arlington Municipal Airport C61
Dallas North No.2 C63/C67915445282221233038533928314048313040391Dallas North No.2 C63/C679
Rockwall Heath C6914540251924232633413824293534282630341Rockwall Heath C69
Grapevine Fairway C70/A301/X18215148262423233340714232314850333543491Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07115140272025242629333927252628272833301Kaufman C71/A304/X071
Granbury C73/C68114535222222202529513031373636253033281Granbury C73/C681
Eagle Mountain Lake C75 14942282526213034503633294246313342401Eagle Mountain Lake C75
Parker County C7614538242324202931543428293844273036321Parker County C76
Cleburne Airport C77/C6821534223202118243145NV3129343427NVNV331Cleburne Airport C77/C682
Dallas Executive Airport C40215840262223222533403227303135272831351Dallas Executive Airport C402
Greenville C1006/A198146422718222824NANV4126313427262634381Greenville C1006/A198
Pilot Point C103215245372927294042725039365040404358621Pilot Point C1032
Italy C1044/A32315439242025222629323726282831272727271Italy C1044/A323
Corsicana Airport C105115747312428273029NVNVNV31NVNVNV3437291Corsicana Airport C1051
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Tyler-Longview-Marshall
Longview C19/A127/C64424956372822342828263726262223222431272Longview C19/A127/C644
Tyler Airport Relocated C8214950272327252731324227262427272633301Tyler Airport Relocated C82
Karnack C85/AFHP30314838313025353328293725252126252534381Karnack C85/AFHP303
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914531505146544849466348516353714952521Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 13827495144504143404747465950565048471Chamizal C41/AH126
Socorro Hueco C49/F31214229505245514746466754495849655454491Socorro Hueco C49/F312
Skyline Park C7214430515048535151476347485853695253551Skyline Park C72
Ivanhoe C414/F51413625464642454142405944435244594747431Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG2211NV355452586058NVNVNV48536160585357631Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Waco
Waco Mazanec C103713446202025252830334130NV3029283029281Waco Mazanec C1037
Temple Georgia C104512926171720202930313929323036273232301Temple Georgia C1045
Killeen Skylark Field C1047132302221272531NVNA353232343131NV43341Killeen Skylark Field C1047
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 22843242325302328313122252226282332272Beaumont-Downtown C2/A112/C2002
West Orange C9/A14122655381626282226NANV20232225273117272West Orange C9/A141
Port Arthur West C28/A128/A22812127191520222222242020232018191828231Port Arthur West C28/A128/A228
Hamshire C64/C654127301611171720222522NV202019191937251Hamshire C64/C654
SETRPC Port Arthur C6281 N323230202730273530262427NVNANANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541281810813152120172322252020202230321SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N173828192930243025262225NVNANANANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64312533221721262227282319221922222030281SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C103512635241822272227282420232023242233311Nederland 17th Street C1035
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Austin
Austin North Hills Drive C3/A3222362922212426293125NV293231NANV4243442Austin North Hills Drive C3/A322
Audubon C3813326151416182330283427292527263133341Audubon C38
Dripping Springs School C6141 N3130191920253034263729313132283235361Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N3223151417182424252824262022252934331CAPCOG Lake Georgetown C690
Lockhart C16041 N26221618NVNV2019223023222925232730301Lockhart C1604
St. Edwards University C16051 N221811910151619172520212321202324251St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N2623181819212323253126242127242727301CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N3224171820242125253226272229262829311CAPCOG Elgin C1613
CAPCOG East Austin C16191 NNVNV191921282933NV3630313233293233351CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N36NV201823NVNANV3036NVNVNVNVNV3235351CAPCOG Round Rock Brushy Creek W C1620
CAPCOG Taylor Murphy Park C16291 N3127171622242326313528302331272931301CAPCOG Taylor Murphy Park C1629
CAPCOG Lake Kyle Park C16301 N2524181617232627253125263127232728301CAPCOG Lake Kyle Park C1630
CAPCOG San Marcos Staples Road C16751 NNANV222221252629273126273327232628311CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Houston-Galveston-Brazoria
Houston East C1/G31625443221720202520252619252323252833252Houston East C1/G316
Houston Aldine C8/AF108/X150 26362252327302826323424322430353749322Houston Aldine C8/AF108/X150
Channelview C15/AH115 36349231721262823293323272526NV2852233Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424155NV2327272623263125292126303235342Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139/FP23915437242021232722282622272124242632271Hou.DeerPrk2 C35/235/1001/AFH139/FP239
Seabrook Friendship Park C451492918171920191922211921202021NV29271Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14933172424212520262723292325242733311Houston Bayland Park C53/A146
Conroe Relocated C78/A321143NV312632433622253431392836494639341Conroe Relocated C78/A321
Manvel Croix Park C84136231618201622182320182521NV222223251Manvel Croix Park C84
Clinton C403/C304/AH113 34631161720192014191914222118202123223Clinton C403/C304/AH113
Houston North Wayside C405/C103315745181619202117NV2413221820232530191Houston North Wayside C405/C1033
Houston Monroe C40613825NANANANANV18222117222218202227221Houston Monroe C406
Lang C40825335202120191919262520261921232835312Lang C408
Houston Croquet C40924127182122192219232221272019202325282Houston Croquet C409
Houston Westhollow C410/C3003143NVNANANANANV22272420252022242529291Houston Westhollow C410/C3003
Park Place C416145NV212021182519252419252423242530281Park Place C416
Houston Harvard Street C4171523723232422262530NVNV3123NV302937311Houston Harvard Street C417
Sheldon C5511 NNV452312172121NVNANV16201922242640201Sheldon C551
Baytown Wetlands Center C5521 N6232181618191918262017222020202436271Baytown Wetlands Center C552
Crosby Library C5531 NNV47301224232923263120252426313448311Crosby Library C553
West Houston C5541 N4735201821212220262619261921242534291West Houston C554
Mercer Arboretum C5571 N5767262427352921243225332228364043361Mercer Arboretum C557
Tom Bass C5581 N3723181719162417212220252422242428281Tom Bass C558
Katy Park C5591 N3930171620191920222119191818192026251Katy Park C559
Atascocita C5601 N5253281621282518213018282125303442291Atascocita C560
Meyer Park C5611 N5164242224252622253022281827293445341Meyer Park C561
Bunker Hill Village C5621 N4630191920171816202118231618202628281Bunker Hill Village C562
Huffman Wolf Road C5631 NNANV3516292835252838NANANANANANANA421Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N664523182021262127292126NVNANANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N55432620242424273130NV29NVNANANANANA1Wallisville Road C617
Texas City 34th St. C620 1 N43211617171723212220NV21NVNANANANANA1Texas City 34th St. C620
Lynchburg Ferry C1015/A165 16840201822222721242422252225262350271Lynchburg Ferry C1015/A165
Lake Jackson C1016 13318161919152120191920232218182017251Lake Jackson C1016
Baytown Garth C101716146272026252628333324282624313560331Baytown Garth C1017
Galveston 99th St. C1034/A320/X183144232120202033312922232422192021NV321Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N332020202117282524212023NVNANANANANA1Oyster Creek C1607
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
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San Antonio
San Antonio Northwest C2323223231213253130313228303834272933352San Antonio Northwest C23
Camp Bullis C58 130222411122531313133283032292731NV381Camp Bullis C58
Calaveras Lake C5912519211914242627283225262928232426291Calaveras Lake C59
Elm Creek Elementary C5011 N252522158142228313326294043262727201Elm Creek Elementary C501
Fair Oaks Ranch C5021 N3124251110222927303329323231283239391Fair Oaks Ranch C502
Bulverde Elementary C5031 N2822241515253129353832343532NV2932361Bulverde Elementary C503
New Braunfels Airport C5041 N2421211612202223252821233021212529321New Braunfels Airport C504
AACOG City of Garden Ridge C505 1 N262122161627252930332628342920252731AACOG City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N2724242218262827293526273526263233351Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N2422212116232829333527273628NV2426281Heritage Middle School C622
CPS Pecan Valley C6781 N21111575181819222520203026121317201CPS Pecan Valley C678
Government Canyon C16101 N2720201011212530313430333635283237391Government Canyon C1610
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Corpus Christi-Victoria
Corpus Christi West C421917172222171717232519191916172116162Corpus Christi West C4
Corpus Christi Tuloso C2111715161920191917232620202016172116171Corpus Christi Tuloso C21
Victoria C87123221720212121NV252722212118192221211Victoria C87
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Lower Rio Grande Valley
Mission C43/AP14312014162319231917292423232017162219201Mission C43/AP143
Harlingen Teege C102311915202322242121312423232320182321241Harlingen Teege C1023
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
123456789101112131415161718
Laredo
Laredo College C441 N2119223128312929303130302726272931311Laredo College C44
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.