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Compliance with Eight-Hour Ozone Standard

In July 1997, the U. S. Environmental Protection Agency (EPA) announced a new National Ambient Air Quality Standard (NAAQS) for ground-level ozone. The EPA phased out and replaced the previous one-hour standard with an eight-hour standard to protect public health against longer exposure to this air pollutant. In March 2008, the EPA updated the eight-hour standard again. A community will meet the eight-hour standard when the three-year average of the annual fourth highest daily maximum eight-hour ozone concentration measured at each monitoring site is less than 71 parts per billion (ppb).

Highlighted rows show the monitor in each area that may ultimately be used to determine the area's compliance with the ozone standard. These highlighted monitors have measured an area's ozone concentrations over the past three years.

Below are the annual fourth highest daily maximum eight-hour average ozone concentrations from data collected beginning January 1, 2020, to date. Data is updated each hour. Data is given for each area that has ozone monitors.

Use the selection boxes below to customize this report. If you want to cut and paste data from this page into another application, such as a spreadsheet, select the comma-delimited format. Click on the Generate Report button once you have made your selections.

YearReport Format
AreaMonitoring SitePOCFourth Highest AverageCurrent
as of
1:10 am CDT
Dallas-Fort Worth
Corsicana Airport C1051163676464
Rockwall Heath C69164635761
Kaufman C71/A304/X071165636263
Dallas Executive Airport C402167705965
Parker County C76168676165
Granbury C73/C681162656062
Grapevine Fairway C70/A301/X182177756271
Dallas North No.2 C63/C679169736268
Pilot Point C1032171856674
Dallas Hinton St. C401/C60/AH161 364745564
Denton Airport South C56/A163/X157171817074
Ft. Worth Northwest C13/AH302 275766471
Midlothian OFW C52/A137161646362
Frisco C31/C680170816772
Italy C1044/A323160646161
Cleburne Airport C77/C682167756669
Arlington Municipal Airport C61168716467
Keller C17271746269
Greenville C1006/A198161655761
Eagle Mountain Lake C75 176766472
Longview C19/A127/C644255645758
Tyler Airport Relocated C82160656362
Karnack C85/AFHP3031556159 **58
El Paso-Juarez
Ivanhoe C414/F514168645261
El Paso UTEP C12/A125/X151/G12527973  
Socorro Hueco C49/F312174716168
Ojo De Agua C1021/FG121/FG2211 7158 
Skyline Park C72171686166
Chamizal C41/AH126 172695565
Ascarate Park SE C37/A332/A172/X1591695652 **59
Waco Mazanec C1037163675963
Temple Georgia C1045164676063
Killeen Skylark Field C1047163706365
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643160665761
Nederland 17th Street C10351576443 **54
SETRPC 40 Sabine Pass C640/C1654162606060
Hamshire C64/C654162625860
West Orange C9/A141262615860
Port Arthur West C28/A128/A2281576551 **57
Beaumont-Downtown C2/A112/C2002 259655459
Audubon C38163656263
Austin North Hills Drive C3/A322246 *666157
Seabrook Friendship Park C45164605058
Houston Westhollow C410/C3003166715263
Hou.DeerPrk2 C35/235/1001/AFH139FP239173745567
Houston Harvard Street C4171 7962 
Houston North Wayside C405/C1033161655560
Houston Monroe C406162685060
Conroe Relocated C78/A321175706770
Houston East C1/G316267766268
Channelview C15/AH115 362685561
Lake Jackson C1016 165695964
Baytown Garth C1017166716266
Park Place C416170785768
Houston Croquet C409266835768
Houston Aldine C8/AF108/X150 268756168
Houston Bayland Park C53/A146 173786170
Clinton C403/C304/AH113 371705665
Northwest Harris Co. C26/A110/X154271696668
Manvel Croix Park C84170775868
Lang C408269716066
Galveston 99th St. C1034/A320/X183168706166
Lynchburg Ferry C1015/A165 161654958
San Antonio
Camp Bullis C58 174786271
Calaveras Lake C59166665562
San Antonio Northwest C23269705765
Corpus Christi-Victoria
Victoria C87160615458
Corpus Christi West C4261655560
Corpus Christi Tuloso C21164645661
Lower Rio Grande Valley
Mission C43/AP143155625657
Harlingen Teege C1023153565153
Laredo Vidaurri C44/AFGP144/P244 (Deactivated Jul 28, 2021)16060 *  
* The value shown for this site does not represent an entire year's worth of data (274 days of valid data).
** The value shown for this site does not represent a complete set of data for 2022 (103 days of valid data).

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.