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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
12345678910
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 265603130302838417541
Keller C17258613530302736396340
Frisco C31/C680162664534353346567958
Denton Airport South C56/A163/X157151734135262940437744
Arlington Municipal Airport C61169432826282432405736
Dallas North No.2 C63/C679162583327272637416145
Rockwall Heath C69147472823272528364842
Grapevine Fairway C70/A301/X182157603329252740438247
Kaufman C71/A304/X071153453122282633333741
Granbury C73/C681150392625242530355931
Eagle Mountain Lake C75 154483430302536385439
Parker County C76149462825262437345736
Cleburne Airport C77/C682165472624242130395030
Dallas Executive Airport C402164483026272628414736
Greenville C1006/A198149543421243033NA4144
Pilot Point C1032156534735313346488254
Italy C1044/A323165502724292529423744
Corsicana Airport C1051159613728312933324047
AreaMonitoring SitePOCJuly 2025
12345678910
Tyler-Longview-Marshall
Longview C19/A127/C644251604136263929403642
Tyler Airport Relocated C82152553126292829423748
Karnack C85/AFHP303158433634284542313240
AreaMonitoring SitePOCJuly 2025
12345678910
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159147395653485655564967
Chamizal C41/AH126 140325852475449544454
Socorro Hueco C49/F312144335557465549524975
Skyline Park C72148335952475757564973
Ivanhoe C414/F514140305248425244474366
Ojo De Agua C1021/FG121/FG221150446054506964676069
AreaMonitoring SitePOCJuly 2025
12345678910
Waco
Waco Mazanec C1037137532324273134353750
Temple Georgia C1045132332020222438323545
Killeen Skylark Field C104713735252633303813NA40
AreaMonitoring SitePOCJuly 2025
12345678910
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 231522933334625353535
West Orange C9/A14123171481835322431NA31
Port Arthur West C28/A128/A228124312917232723282926
Hamshire C64/C654130342014182123273326
SETRPC 40 Sabine Pass C640/C1654186531410155561242034
SETRPC 43 Jefferson Co Airport C643128402920253524333329
Nederland 17th Street C1035128443923273324343229
AreaMonitoring SitePOCJuly 2025
12345678910
Austin
Austin North Hills Drive C3/A322241342725273133342838
Audubon C38139322121182127343236
Dripping Springs School C6141 N36352426253234403041
CAPCOG Lake Georgetown C6901 N35271921202228263331
Lockhart C16041 N30252320141726232633
St. Edwards University C16051 N25231313131719222127
CAPCOG Bastrop CAMS16121 N29262422232526283333
CAPCOG Elgin C16131 N41271920282626313234
CAPCOG East Austin C16191 N36312322243233412937
CAPCOG Round Rock Brushy Creek W C16201 N413228242922NA303439
CAPCOG Taylor Murphy Park C16291 N40342318282626343538
CAPCOG Lake Kyle Park C16301 N29282221253329363133
CAPCOG San Marcos Staples Road C16751 NNA292626232731373333
AreaMonitoring SitePOCJuly 2025
12345678910
Houston-Galveston-Brazoria
Houston East C1/G316289683418222329283129
Houston Aldine C8/AF108/X150 2851005528323737383840
Channelview C15/AH115 392683619243234283839
Northwest Harris Co. C26/A110/X154248713926302930273136
Hou.DeerPrk2 C35/235/1001/AFH139/FP239170473523232832283227
Seabrook Friendship Park C45171352619202422242523
Houston Bayland Park C53/A146 155393125292430253432
Conroe Relocated C78/A321161554537385049253439
Manvel Croix Park C84143292220221925232623
Clinton C403/C304/AH113 361402919222423192823
Houston North Wayside C405/C1033169753619222529252627
Houston Monroe C40615033NANANANA26222524
Lang C408267453423252129263530
Houston Croquet C409248342923252328243123
Houston Westhollow C410/C300314722NANANANA23243527
Park Place C416152303121252128252827
Houston Harvard Street C417160473727272331333935
Sheldon C5511 N6870391422272625NA31
Baytown Wetlands Center C5521 N84402819212221263223
Crosby Library C5531 N74805117283035323540
West Houston C5541 N62443220242627253030
Mercer Arboretum C5571 N731015131314439262938
Tom Bass C5581 N44292319221828232424
Katy Park C5591 N44382419252324222523
Atascocita C5601 N69805625243536222837
Meyer Park C5611 N731004224273533252934
Bunker Hill Village C5621 N53402821252025212624
Huffman Wolf Road C5631 NNA845221333549303348
Lynchburg Ferry C1015/A165 198543220242731282926
Lake Jackson C1016 146211820211623222220
Baytown Garth C1017187663726282828404039
Galveston 99th St. C1034/A320/X183154272322222134353223
Oyster Creek C1607 1 N442221222219NANANANA
AreaMonitoring SitePOCJuly 2025
12345678910
San Antonio
San Antonio Northwest C23236282517163034333235
Camp Bullis C58 134302716143037343336
Calaveras Lake C59127242322172828313133
Elm Creek Elementary C5011 N37323133133528323335
Fair Oaks Ranch C5021 N34312714122634313336
Bulverde Elementary C5031 N32282718223139343942
New Braunfels Airport C5041 N27262419152326263030
AACOG City of Garden Ridge C505 1 N27262317183029333535
Seguin Outdoor Learning Center C5061 N29312725212833323238
Heritage Middle School C6221 N32262425193031333637
CPS Pecan Valley C6781 N2319171062022232426
Government Canyon C16101 N31222214142529333337
AreaMonitoring SitePOCJuly 2025
12345678910
Corpus Christi-Victoria
Corpus Christi West C4224191924231820252527
Corpus Christi Tuloso C21119171722212122232630
Victoria C87129252021222424302930
AreaMonitoring SitePOCJuly 2025
12345678910
Lower Rio Grande Valley
Mission C43/AP143125171825202622203227
Harlingen Teege C1023124182225242623233627
AreaMonitoring SitePOCJuly 2025
12345678910
Laredo
Laredo College C441 N24212435313330333532
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.