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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
12
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2NVNA
Keller C172NVNA
Frisco C31/C6801NVNA
Denton Airport South C56/A163/X1571NVNA
Arlington Municipal Airport C611NVNA
Dallas North No.2 C63/C6791NVNA
Rockwall Heath C691NVNA
Grapevine Fairway C70/A301/X1821NVNA
Kaufman C71/A304/X0711NVNA
Granbury C73/C6811NVNA
Eagle Mountain Lake C75 1NVNA
Parker County C761NVNA
Cleburne Airport C77/C6821NVNA
Dallas Executive Airport C4021NVNA
Greenville C1006/A1981NVNA
Pilot Point C10321NVNA
Italy C1044/A3231NVNA
Corsicana Airport C10511NVNA
AreaMonitoring SitePOCJuly 2025
12
Tyler-Longview-Marshall
Longview C19/A127/C6442NVNA
Tyler Airport Relocated C821NVNA
Karnack C85/AFHP3031NVNA
AreaMonitoring SitePOCJuly 2025
12
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X1591NVNA
Chamizal C41/AH126 1NVNA
Socorro Hueco C49/F3121NVNA
Skyline Park C721NVNA
Ivanhoe C414/F5141NVNA
Ojo De Agua C1021/FG121/FG2211NVNA
AreaMonitoring SitePOCJuly 2025
12
Waco
Waco Mazanec C10371NVNA
Temple Georgia C10451NVNA
Killeen Skylark Field C10471NVNA
AreaMonitoring SitePOCJuly 2025
12
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2NVNA
West Orange C9/A1412NVNA
Port Arthur West C28/A128/A2281NVNA
Hamshire C64/C6541NVNA
SETRPC 40 Sabine Pass C640/C16541NVNA
SETRPC 43 Jefferson Co Airport C6431NVNA
Nederland 17th Street C10351NVNA
AreaMonitoring SitePOCJuly 2025
12
Austin
Austin North Hills Drive C3/A3222NVNA
Audubon C381NVNA
Dripping Springs School C6141 NNVNA
CAPCOG Lake Georgetown C6901 NNVNA
Lockhart C16041 NNVNA
St. Edwards University C16051 NNVNA
CAPCOG Bastrop CAMS16121 NNVNA
CAPCOG Elgin C16131 NNVNA
CAPCOG East Austin C16191 NNVNA
CAPCOG Round Rock Brushy Creek W C16201 NNVNA
CAPCOG Taylor Murphy Park C16291 NNVNA
CAPCOG Lake Kyle Park C16301 NNVNA
AreaMonitoring SitePOCJuly 2025
12
Houston-Galveston-Brazoria
Houston East C1/G3162NVNA
Houston Aldine C8/AF108/X150 2NVNA
Channelview C15/AH115 3NVNA
Northwest Harris Co. C26/A110/X1542NVNA
Hou.DeerPrk2 C35/235/1001/AFH139/FP2391NVNA
Seabrook Friendship Park C451NVNA
Houston Bayland Park C53/A146 1NVNA
Conroe Relocated C78/A3211NVNA
Manvel Croix Park C841NVNA
Clinton C403/C304/AH113 3NVNA
Houston North Wayside C405/C10331NVNA
Houston Monroe C4061NVNA
Lang C4082NVNA
Houston Croquet C4092NVNA
Houston Westhollow C410/C30031NVNA
Park Place C4161NVNA
Houston Harvard Street C4171NVNA
Sheldon C5511 NNVNA
Baytown Wetlands Center C5521 NNVNA
Crosby Library C5531 NNVNA
West Houston C5541 NNVNA
Mercer Arboretum C5571 NNVNA
Tom Bass C5581 NNVNA
Katy Park C5591 NNVNA
Atascocita C5601 NNVNA
Meyer Park C5611 NNVNA
Bunker Hill Village C5621 NNVNA
Lynchburg Ferry C1015/A165 1NVNA
Lake Jackson C1016 1NVNA
Baytown Garth C10171NVNA
Galveston 99th St. C1034/A320/X1831NVNA
AreaMonitoring SitePOCJuly 2025
12
San Antonio
San Antonio Northwest C232NVNA
Camp Bullis C58 1NVNA
Calaveras Lake C591NVNA
Elm Creek Elementary C5011 NNVNA
Fair Oaks Ranch C5021 NNVNA
Bulverde Elementary C5031 NNVNA
New Braunfels Airport C5041 NNVNA
AACOG City of Garden Ridge C505 1 NNVNA
Seguin Outdoor Learning Center C5061 NNVNA
Heritage Middle School C6221 NNVNA
CPS Pecan Valley C6781 NNVNA
Government Canyon C16101 NNVNA
AreaMonitoring SitePOCJuly 2025
12
Corpus Christi-Victoria
Corpus Christi West C42NVNA
Corpus Christi Tuloso C211NVNA
Victoria C871NVNA
AreaMonitoring SitePOCJuly 2025
12
Lower Rio Grande Valley
Mission C43/AP1431NVNA
Harlingen Teege C10231NVNA
AreaMonitoring SitePOCJuly 2025
12
Laredo
Laredo College C441 NNVNA
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.