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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, 2015, 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
6:11 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051164605158
Rockwall Heath C69171614559
Kaufman C71/A304/X071164574756
Dallas Executive Airport C402168624257
Parker County C76179684463
Granbury C73/C681173634660
Grapevine Fairway C70/A301/X182179754666
Dallas North No.2 C63/C679179674764
Pilot Point C1032179754566
Dallas Hinton St. C401/C60/AH161 380694464
Denton Airport South C56/A163/X157188764971
Ft. Worth Northwest C13/AH302 279664663
Midlothian OFW C52/A137168604758
Frisco C31/C680177734765
Italy C1044/A323166604858
Cleburne Airport C77/C682173725265
Arlington Municipal Airport C61169614357
Keller C17276704764
Greenville C1006/A198162584755
Eagle Mountain Lake C75 178674864
Longview C19/A127/C644268654860
Tyler Airport Relocated C82166634959
Karnack C85/AFHP303162594856
El Paso-Juarez
Ivanhoe C414165594556
El Paso UTEP C12/A125/X151272714863
Socorro Hueco C49/F312169644158
Skyline Park C72169665061
Chamizal C41/AH126 170655061
Ascarate Park SE C37/A332/A172/X159164664558
Waco Mazanec C1037168604959
Temple Georgia C1045172645363
Killeen Skylark Field C1047167665161
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643165594857
Nederland High School C1035 174634761
SETRPC 40 Sabine Pass C640/C1654164675562
Hamshire C64/C654168694962
West Orange C9/A141262584454
Port Arthur West C28/A128/A228175644962
Beaumont-Downtown C2/A112/C2002 269604758
Audubon C38173625061
Austin Northwest C3/A322273645062
Seabrook Friendship Park C45183645166
Houston Westhollow C410179794467
Hou.DeerPrk2 C35/235/1001/AFH139FP239177624762
Houston North Wayside C405178624060
Houston Monroe C406173574056
Conroe Relocated C78/A321173715165
Houston East C1/G316288674566
Channelview C15/AH115 381614462
Lake Jackson C1016 165665060
Baytown Garth C1017177655164
Park Place C416187654465
Houston Croquet C409279674764
Houston Aldine C8/AF108/X150 295744872
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)18570  
Houston Bayland Park C53/A146 180784668
Clinton C403/C304/AH113 384654364
Northwest Harris Co. C26/A110/X154278674563
Manvel Croix Park C84186695269
Lang C408291694267
Galveston 99th St. C1034/A320/X183184745571
Lynchburg Ferry C1015/A165 179593959
San Antonio
Camp Bullis C58 180694966
Calaveras Lake C59168624959
San Antonio Northwest C23279714665
Corpus Christi-Victoria
Victoria C87170644860
Corpus Christi West C4265625360
Corpus Christi Tuloso C21162615057
Lower Rio Grande Valley
Brownsville C80/AGP180160524652
Mission C43/AP143158524451
Harlingen Teege C1023158554954
Laredo Vidaurri C44/AFGP144/P244156503948

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.