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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
12345678910111213
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 265603130302838417541383452
Keller C17258613530302736396340363352
Frisco C31/C680162664534353346567958414261
Denton Airport South C56/A163/X157151734135262940437744403651
Arlington Municipal Airport C61169432826282432405736323141
Dallas North No.2 C63/C679162583327272637416145313549
Rockwall Heath C69147472823272528364842273946
Grapevine Fairway C70/A301/X182157603329252740438247353752
Kaufman C71/A304/X071153453122282633333741302828
Granbury C73/C681150392625242530355931373142
Eagle Mountain Lake C75 154483430302536385439383246
Parker County C76149462825262437345736312941
Cleburne Airport C77/C682165472624242130395030343337
Dallas Executive Airport C402164483026272628414736293135
Greenville C1006/A198149543421243033NA4144314049
Pilot Point C1032156534735313346488254424054
Italy C1044/A323165502724292529423744303432
Corsicana Airport C1051159613728312933324047303429
AreaMonitoring SitePOCJuly 2025
12345678910111213
Tyler-Longview-Marshall
Longview C19/A127/C644251604136263929403642343324
Tyler Airport Relocated C82152553126292829423748302926
Karnack C85/AFHP303158433634284542313240322725
AreaMonitoring SitePOCJuly 2025
12345678910111213
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159147395653485655564967515570
Chamizal C41/AH126 140325852475449544454504966
Socorro Hueco C49/F312144335557465549524975595063
Skyline Park C72148335952475757564973495166
Ivanhoe C414/F514140305248425244474366464557
Ojo De Agua C1021/FG121/FG221150446054506964676069515773
AreaMonitoring SitePOCJuly 2025
12345678910111213
Waco
Waco Mazanec C1037137532324273134353750323334
Temple Georgia C1045132332020222438323545323835
Killeen Skylark Field C104713735252633303813NA40363439
AreaMonitoring SitePOCJuly 2025
12345678910111213
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 231522933334625353535252624
West Orange C9/A14123171481835322431NA31232525
Port Arthur West C28/A128/A228124312917232723282926222522
Hamshire C64/C654130342014182123273326202322
SETRPC 40 Sabine Pass C640/C1654186531410155561242034242722
SETRPC 43 Jefferson Co Airport C643128402920253524333329212321
Nederland 17th Street C1035128443923273324343229222421
AreaMonitoring SitePOCJuly 2025
12345678910111213
Austin
Austin North Hills Drive C3/A322241342725273133342838313535
Audubon C38139322121182127343236303129
Dripping Springs School C6141 N36352426253234403041333337
CAPCOG Lake Georgetown C6901 N35271921202228263331283024
Lockhart C16041 N30252320141726232633292739
St. Edwards University C16051 N25231313131719222127232327
CAPCOG Bastrop CAMS16121 N29262422232526283333283027
CAPCOG Elgin C16131 N41271920282626313234293229
CAPCOG East Austin C16191 N36312322243233412937333336
CAPCOG Round Rock Brushy Creek W C16201 N413228242922NA303439293335
CAPCOG Taylor Murphy Park C16291 N40342318282626343538303327
CAPCOG Lake Kyle Park C16301 N29282221253329363133292938
CAPCOG San Marcos Staples Road C16751 NNA292626232731373333303036
AreaMonitoring SitePOCJuly 2025
12345678910111213
Houston-Galveston-Brazoria
Houston East C1/G316289683418222329283129242927
Houston Aldine C8/AF108/X150 2851005528323737383840293732
Channelview C15/AH115 392683619243234283839273129
Northwest Harris Co. C26/A110/X154248713926302930273136303629
Hou.DeerPrk2 C35/235/1001/AFH139/FP239170473523232832283227252828
Seabrook Friendship Park C45171352619202422242523212321
Houston Bayland Park C53/A146 155393125292430253432253227
Conroe Relocated C78/A321161554537385049253439374634
Manvel Croix Park C84143292220221925232623212824
Clinton C403/C304/AH113 361402919222423192823192525
Houston North Wayside C405/C1033169753619222529252627192626
Houston Monroe C40615033NANANANA26222524202524
Lang C408267453423252129263530232922
Houston Croquet C409248342923252328243123253123
Houston Westhollow C410/C300314722NANANANA23243527242825
Park Place C416152303121252128252827222827
Houston Harvard Street C417160473727272331333935293528
Sheldon C5511 N6870391422272625NA31222625
Baytown Wetlands Center C5521 N84402819212221263223192422
Crosby Library C5531 N74805117283035323540282732
West Houston C5541 N62443220242627253030233325
Mercer Arboretum C5571 N731015131314439262938303929
Tom Bass C5581 N44292319221828232424232927
Katy Park C5591 N44382419252324222523222124
Atascocita C5601 N69805625243536222837253230
Meyer Park C5611 N731004224273533252934253227
Bunker Hill Village C5621 N53402821252025212624222620
Huffman Wolf Road C5631 NNA8452213335493033484NANA
Lynchburg Ferry C1015/A165 198543220242731282926242825
Lake Jackson C1016 146211820211623222220242523
Baytown Garth C1017187663726282828404039273028
Galveston 99th St. C1034/A320/X183154272322222134353223252724
Oyster Creek C1607 1 N442221222219NANANANANANANA
AreaMonitoring SitePOCJuly 2025
12345678910111213
San Antonio
San Antonio Northwest C23236282517163034333235293139
Camp Bullis C58 134302716143037343336313236
Calaveras Lake C59127242322172828313133262734
Elm Creek Elementary C5011 N37323133133528323335284449
Fair Oaks Ranch C5021 N34312714122634313336323436
Bulverde Elementary C5031 N32282718223139343942343641
New Braunfels Airport C5041 N27262419152326263030232432
AACOG City of Garden Ridge C505 1 N27262317183029333535283039
Seguin Outdoor Learning Center C5061 N29312725212833323238302940
Heritage Middle School C6221 N32262425193031333637292939
CPS Pecan Valley C6781 N2319171062022232426212233
Government Canyon C16101 N31222214142529333337333643
AreaMonitoring SitePOCJuly 2025
12345678910111213
Corpus Christi-Victoria
Corpus Christi West C4224191924231820252527192121
Corpus Christi Tuloso C21119171722212122232630212321
Victoria C87129252021222424302930242522
AreaMonitoring SitePOCJuly 2025
12345678910111213
Lower Rio Grande Valley
Mission C43/AP143125171825202622203227252422
Harlingen Teege C1023124182225242623233627252525
AreaMonitoring SitePOCJuly 2025
12345678910111213
Laredo
Laredo College C441 N24212435313330333532313229
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.