Skip to content. | Skip to navigation

Personal tools


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
1:12 am CDT
Dallas-Fort Worth
Corsicana Airport C1051170745064
Rockwall Heath C69180735569
Kaufman C71/A304/X071173755266
Dallas Executive Airport C402185745270
Parker County C76176746070
Granbury C73/C681180755770
Grapevine Fairway C70/A301/X182186835775
Dallas North No.2 C63/C679186775572
Pilot Point C1032178845672
Dallas Hinton St. C401/C60/AH161 387815273
Denton Airport South C56/A163/X157181855874
Ft. Worth Northwest C13/AH302 277845672
Midlothian OFW C52/A137178755469
Frisco C31/C680184785572
Italy C1044/A323171725465
Cleburne Airport C77/C682182775772
Arlington Municipal Airport C61192685471
Keller C17279805471
Greenville C1006/A198175705466
Eagle Mountain Lake C75 187775171
Longview C19/A127/C644278715367
Tyler Airport Relocated C82176715567
Karnack C85/AFHP303172705766
El Paso-Juarez
Ivanhoe C414157605356
El Paso UTEP C12/A125/X151274735366
Socorro Hueco C49/F312138 *665151
Skyline Park C72168665061
Chamizal C41/AH126 169695163
Ascarate Park SE C37/A332/A172/X159165604657
Waco Mazanec C1037173725366
Temple Georgia C10451 53 *56 
Killeen Skylark Field C1047178716069
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643170584658
Nederland High School C1035 169655362
SETRPC 40 Sabine Pass C640/C1654176674763
Hamshire C64/C654173665564
West Orange C9/A141272625462
Port Arthur West C28/A128/A228166 *645260
Beaumont-Downtown C2/A112/C2002 275654762
Audubon C38176705466
Austin Northwest C3/A322274695465
Seabrook Friendship Park C45186675067
Houston Westhollow C410181775069
Hou.DeerPrk2 C35/235/1001/AFH139FP239185694666
Houston North Wayside C405175704964
Houston Monroe C406185745270
Conroe Relocated C78/A321182755871
Houston East C1/G316283695368
Channelview C15/AH115 377614862
Lake Jackson C1016 171675163
Baytown Garth C1017171 *61 *51 **61
Park Place C416177795169
Houston Croquet C409279794969
Houston Aldine C8/AF108/X150 275745267
Houston Texas Avenue C411182724466
Houston Regional Office C81 (Deactivated Jun 25, 2012)175 *   
Houston Bayland Park C53/A146 177814969
Clinton C403/C304/AH113 381674664
Northwest Harris Co. C26/A110/X154282804769
Manvel Croix Park C84187845174
Lang C408281794969
Galveston 99th St. C1034/A320/X183181645366
Lynchburg Ferry C1015/A165 175644561
San Antonio
Camp Bullis C58187836177
Calaveras Lake C59170695665
San Antonio Northwest C23281765671
Corpus Christi-Victoria
Victoria C87166624959
Corpus Christi West C4269665262
Corpus Christi Tuloso C21165665160
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 (80 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.