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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
11:10 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051164603854
Rockwall Heath C69171613254
Kaufman C71/A304/X071164573853
Dallas Executive Airport C402168622953
Parker County C76179683661
Granbury C73/C681173633958
Grapevine Fairway C70/A301/X182179753262
Dallas North No.2 C63/C679179673560
Pilot Point C1032179753663
Dallas Hinton St. C401/C60/AH161 380693260
Denton Airport South C56/A163/X157188763967
Ft. Worth Northwest C13/AH302 279663560
Midlothian OFW C52/A137168603855
Frisco C31/C680177733561
Italy C1044/A323166603754
Cleburne Airport C77/C682173724463
Arlington Municipal Airport C61169613454
Keller C17276703761
Greenville C1006/A198162583652
Eagle Mountain Lake C75 178673158
Longview C19/A127/C644268653556
Tyler Airport Relocated C82166633855
Karnack C85/AFHP303162593552
El Paso-Juarez
Ivanhoe C414165593753
El Paso UTEP C12/A125/X151272713760
Socorro Hueco C49/F312169643455
Skyline Park C72169664158
Chamizal C41/AH126 170653857
Ascarate Park SE C37/A332/A172/X159164663454
Waco Mazanec C1037168603855
Temple Georgia C1045172644159
Killeen Skylark Field C1047167664158
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643165593653
Nederland High School C1035 174633758
SETRPC 40 Sabine Pass C640/C1654164672853
Hamshire C64/C654168693758
West Orange C9/A141262583351
Port Arthur West C28/A128/A228175643758
Beaumont-Downtown C2/A112/C2002 269603655
Audubon C38173623757
Austin Northwest C3/A322273643858
Seabrook Friendship Park C45183644062
Houston Westhollow C410179793464
Hou.DeerPrk2 C35/235/1001/AFH139FP239177623658
Houston North Wayside C405178622956
Houston Monroe C406173573354
Conroe Relocated C78/A321173713961
Houston East C1/G316288673563
Channelview C15/AH115 381613559
Lake Jackson C1016 165664057
Baytown Garth C1017177653659
Park Place C416187653361
Houston Croquet C409279673660
Houston Aldine C8/AF108/X150 295743568
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)18570  
Houston Bayland Park C53/A146 180783564
Clinton C403/C304/AH113 384653260
Northwest Harris Co. C26/A110/X154278673660
Manvel Croix Park C84186693864
Lang C408291693364
Galveston 99th St. C1034/A320/X183184744266
Lynchburg Ferry C1015/A165 179592955
San Antonio
Camp Bullis C58 180693862
Calaveras Lake C59168623856
San Antonio Northwest C23279713762
Corpus Christi-Victoria
Victoria C87170643957
Corpus Christi West C4265623855
Corpus Christi Tuloso C21162613954
Lower Rio Grande Valley
Brownsville C80/AGP180160523549
Mission C43/AP143158523247
Harlingen Teege C1023158553549
Laredo Vidaurri C44/AFGP144/P244156502844

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 beginning 1/1/2013, 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.