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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 76 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, 2012, 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
9:12 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051170745265
Rockwall Heath C69180736071
Kaufman C71/A304/X071173755467
Dallas Executive Airport C402185745571
Parker County C76176746170
Granbury C73/C681180756172
Grapevine Fairway C70/A301/X182186835976
Dallas North No.2 C63/C679186775974
Pilot Point C1032178846074
Dallas Hinton St. C401/C60/AH161 387815775
Denton Airport South C56/A163/X157181856175
Ft. Worth Northwest C13/AH302 277846073
Midlothian OFW C52/A137178755669
Frisco C31/C680184785873
Italy C1044/A323171725465
Cleburne Airport C77/C682182776073
Arlington Municipal Airport C61192685571
Keller C17279805872
Greenville C1006/A198175705466
Eagle Mountain Lake C75 187775673
Longview C19/A127/C644278715367
Tyler Airport Relocated C82176715567
Karnack C85/AFHP303172705766
El Paso-Juarez
Ivanhoe C414157605657
El Paso UTEP C12/A125/X151274735667
Socorro Hueco C49/F312138 *665352
Skyline Park C72168665462
Chamizal C41/AH126 169695464
Ascarate Park SE C37/A332/A172/X159165604958
Waco Mazanec C1037173725466
Temple Georgia C10451 53 *59 
Killeen Skylark Field C1047178716170
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643170585260
Nederland High School C1035 169655663
SETRPC 40 Sabine Pass C640/C1654176675265
Hamshire C64/C654173665564
West Orange C9/A141272625563
Port Arthur West C28/A128/A228166 *645260
Beaumont-Downtown C2/A112/C2002 275655063
Audubon C38176705667
Austin Northwest C3/A322274695465
Seabrook Friendship Park C45186675168
Houston Westhollow C410181775370
Hou.DeerPrk2 C35/235/1001/AFH139FP239185694967
Houston North Wayside C405175705265
Houston Monroe C406185745471
Conroe Relocated C78/A321182755972
Houston East C1/G316283695468
Channelview C15/AH115 377614962
Lake Jackson C1016 171675263
Baytown Garth C1017171 *61 *56 **62
Park Place C416177795169
Houston Croquet C409279795270
Houston Aldine C8/AF108/X150 275745668
Houston Texas Avenue C411182724867
Houston Regional Office C81 (Deactivated Jun 25, 2012)175 *   
Houston Bayland Park C53/A146 177815169
Clinton C403/C304/AH113 381674965
Northwest Harris Co. C26/A110/X154282804870
Manvel Croix Park C84187845575
Lang C408281795571
Galveston 99th St. C1034/A320/X183181645366
Lynchburg Ferry C1015/A165 175644561
San Antonio
Camp Bullis C58187836377
Calaveras Lake C59170695765
San Antonio Northwest C23281765771
Corpus Christi-Victoria
Victoria C87166624959
Corpus Christi West C4269665362
Corpus Christi Tuloso C21165665261
Lower Rio Grande Valley
Brownsville C80/AGP180158585256
Mercedes C1048/A310 (Deactivated Oct 10, 2012)160   
Mission C43/AP143161554955
Harlingen Teege C1023150 *625254
Laredo Vidaurri C44/AFGP144/P244161 *655259
* 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 2014 (85 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 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.