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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 2025POCMonitoring Site
1234567891011121314151617
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 265603130302838417541383452543541452Ft. Worth Northwest C13/AH302
Keller C17258613530302736396340363352543540472Keller C17
Frisco C31/C680162664534353346567958414261684447681Frisco C31/C680
Denton Airport South C56/A163/X157151734135262940437744403651623942561Denton Airport South C56/A163/X157
Arlington Municipal Airport C61169432826282432405736323141433437391Arlington Municipal Airport C61
Dallas North No.2 C63/C679162583327272637416145313549583635501Dallas North No.2 C63/C679
Rockwall Heath C69147472823272528364842273946413228321Rockwall Heath C69
Grapevine Fairway C70/A301/X182157603329252740438247353752593640491Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071153453122282633333741302828323533371Kaufman C71/A304/X071
Granbury C73/C681150392625242530355931373142412940401Granbury C73/C681
Eagle Mountain Lake C75 154483430302536385439383246533240461Eagle Mountain Lake C75
Parker County C76149462825262437345736312941493137381Parker County C76
Cleburne Airport C77/C682165472624242130395030343337423538431Cleburne Airport C77/C682
Dallas Executive Airport C402164483026272628414736293135403132361Dallas Executive Airport C402
Greenville C1006/A198149543421243033NA4144314049333028351Greenville C1006/A198
Pilot Point C1032156534735313346488254424054484448641Pilot Point C1032
Italy C1044/A323165502724292529423744303432333130291Italy C1044/A323
Corsicana Airport C1051159613728312933324047303429384241421Corsicana Airport C1051
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Tyler-Longview-Marshall
Longview C19/A127/C644251604136263929403642343324282325342Longview C19/A127/C644
Tyler Airport Relocated C82152553126292829423748302926323128431Tyler Airport Relocated C82
Karnack C85/AFHP303158433634284542313240322725333530371Karnack C85/AFHP303
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159147395653485655564967515570577751601Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 140325852475449544454504966547354561Chamizal C41/AH126
Socorro Hueco C49/F312144335557465549524975595063527556601Socorro Hueco C49/F312
Skyline Park C72148335952475757564973495166647656571Skyline Park C72
Ivanhoe C414/F514140305248425244474366464557516248521Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG221150446054506964676069515773706156601Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Waco
Waco Mazanec C1037137532324273134353750323334373233311Waco Mazanec C1037
Temple Georgia C1045132332020222438323545323835433136361Temple Georgia C1045
Killeen Skylark Field C104713735252633303813NA40363439373743521Killeen Skylark Field C1047
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 231522933334625353535252624333425412Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123171481835322431NA31232525304239222West Orange C9/A141
Port Arthur West C28/A128/A228124312917232723282926222522212620331Port Arthur West C28/A128/A228
Hamshire C64/C654130342014182123273326202322222624521Hamshire C64/C654
SETRPC Port Arthur C6281 N40363822303529393428262927NANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654186531410155561242034242722222226351SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N21523722413529362929242825NANANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643128402920253524333329212321302822381SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C1035128443923273324343229222421312924411Nederland 17th Street C1035
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Austin
Austin North Hills Drive C3/A322241342725273133342838313535374244462Austin North Hills Drive C3/A322
Audubon C38139322121182127343236303129322833381Audubon C38
Dripping Springs School C6141 N36352426253234403041333337342934381Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N35271921202228263331283024252832381CAPCOG Lake Georgetown C690
Lockhart C16041 N30252320141726232633292739342630331Lockhart C1604
St. Edwards University C16051 N25231313131719222127232327262326261St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N29262422232526283333283027353029311CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N41271920282626313234293229363132331CAPCOG Elgin C1613
CAPCOG East Austin C16191 N36312322243233412937333336373234361CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N413228242922NA303439293335383034391CAPCOG Round Rock Brushy Creek W C1620
CAPCOG Taylor Murphy Park C16291 N40342318282626343538303327363132351CAPCOG Taylor Murphy Park C1629
CAPCOG Lake Kyle Park C16301 N29282221253329363133292938312531331CAPCOG Lake Kyle Park C1630
CAPCOG San Marcos Staples Road C16751 NNA292626232731373333303036322629341CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Houston-Galveston-Brazoria
Houston East C1/G316289683418222329283129242927273131422Houston East C1/G316
Houston Aldine C8/AF108/X150 2851005528323737383840293732424241602Houston Aldine C8/AF108/X150
Channelview C15/AH115 392683619243234283839273129353236643Channelview C15/AH115
Northwest Harris Co. C26/A110/X154248713926302930273136303629343839432Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139/FP239170473523232832283227252828282930381Hou.DeerPrk2 C35/235/1001/AFH139/FP239
Seabrook Friendship Park C45171352619202422242523212321282725401Seabrook Friendship Park C45
Houston Bayland Park C53/A146 155393125292430253432253227312630401Houston Bayland Park C53/A146
Conroe Relocated C78/A321161554537385049253439374634416161441Conroe Relocated C78/A321
Manvel Croix Park C84143292220221925232623212824232524281Manvel Croix Park C84
Clinton C403/C304/AH113 361402919222423192823192525272623303Clinton C403/C304/AH113
Houston North Wayside C405/C1033169753619222529252627192626322729391Houston North Wayside C405/C1033
Houston Monroe C40615033NANANANA26222524202524192423321Houston Monroe C406
Lang C408267453423252129263530232922252832432Lang C408
Houston Croquet C409248342923252328243123253123232424302Houston Croquet C409
Houston Westhollow C410/C300314722NANANANA23243527242825232929361Houston Westhollow C410/C3003
Park Place C416152303121252128252827222827272927401Park Place C416
Houston Harvard Street C417160473727272331333935293528313332461Houston Harvard Street C417
Sheldon C5511 N6870391422272625NA31222625333432521Sheldon C551
Baytown Wetlands Center C5521 N84402819212221263223192422242529461Baytown Wetlands Center C552
Crosby Library C5531 N74805117283035323540282732334843621Crosby Library C553
West Houston C5541 N62443220242627253030233325253227411West Houston C554
La Porte Sylvan Beach C5561 NNANANANANANANANANANANANANANANANANA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N731015131314439262938303929394349511Mercer Arboretum C557
Tom Bass C5581 N44292319221828232424232927262826331Tom Bass C558
Katy Park C5591 N44382419252324222523222124222322321Katy Park C559
Atascocita C5601 N69805625243536222837253230384443481Atascocita C560
Meyer Park C5611 N731004224273533252934253227373842511Meyer Park C561
Bunker Hill Village C5621 N53402821252025212624222620212531361Bunker Hill Village C562
Huffman Wolf Road C5631 NNA8452213335493033484NANANANANANA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N96683923222531303334252929NANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N80623524272727373635213331NANANANA1Wallisville Road C617
Texas City 34th St. C620 1 N50241818191923252522212321NANANANA1Texas City 34th St. C620
Lynchburg Ferry C1015/A165 198543220242731282926242825303531671Lynchburg Ferry C1015/A165
Lake Jackson C1016 146211820211623222220242523202021241Lake Jackson C1016
Baytown Garth C1017187663726282828404039273028304143861Baytown Garth C1017
Galveston 99th St. C1034/A320/X183154272322222134353223252724222224231Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N44222122221928292724212523NANANANA1Oyster Creek C1607
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
San Antonio
San Antonio Northwest C23236282517163034333235293139382831362San Antonio Northwest C23
Camp Bullis C58 134302716143037343336313236333034391Camp Bullis C58
Calaveras Lake C59127242322172828313133262734392629301Calaveras Lake C59
Elm Creek Elementary C5011 N37323133133528323335284449493630321Elm Creek Elementary C501
Fair Oaks Ranch C5021 N34312714122634313336323436363036441Fair Oaks Ranch C502
Bulverde Elementary C5031 N32282718223139343942343641362833351Bulverde Elementary C503
New Braunfels Airport C5041 N27262419152326263030232432272328341New Braunfels Airport C504
AACOG City of Garden Ridge C505 1 N27262317183029333535283039352629311AACOG City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N29312725212833323238302940312937381Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N32262425193031333637292939382228321Heritage Middle School C622
CPS Pecan Valley C6781 N2319171062022232426212233331615191CPS Pecan Valley C678
Government Canyon C16101 N31222214142529333337333643393135411Government Canyon C1610
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Corpus Christi-Victoria
Corpus Christi West C4224191924231820252527192121181822172Corpus Christi West C4
Corpus Christi Tuloso C21119171722212122232630212321171823171Corpus Christi Tuloso C21
Victoria C87129252021222424302930242522202224231Victoria C87
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Lower Rio Grande Valley
Mission C43/AP143125171825202622203227252422191823201Mission C43/AP143
Harlingen Teege C1023124182225242623233627252525222125221Harlingen Teege C1023
AreaMonitoring SitePOCJuly 2025POCMonitoring Site
1234567891011121314151617
Laredo
Laredo College C441 N24212435313330333532313229273031351Laredo College C44
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.