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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, 2016, 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 am CST
Dallas-Fort Worth
Corsicana Airport C1051160656463
Rockwall Heath C69161677668
Kaufman C71/A304/X071157626561
Dallas Executive Airport C402162637366
Parker County C76168656265
Granbury C73/C681163666464
Grapevine Fairway C70/A301/X182175737373
Dallas North No.2 C63/C679167778175
Pilot Point C1032175687171
Dallas Hinton St. C401/C60/AH161 369757673
Denton Airport South C56/A163/X157176737173
Ft. Worth Northwest C13/AH302 266737270
Midlothian OFW C52/A137160676664
Frisco C31/C680173727573
Italy C1044/A323160666965
Cleburne Airport C77/C682172756871
Arlington Municipal Airport C61161716967
Keller C17270757473
Greenville C1006/A198158666362
Eagle Mountain Lake C75 167706968
Longview C19/A127/C644265626463
Tyler Airport Relocated C82163636262
Karnack C85/AFHP303159635860
El Paso-Juarez
Ivanhoe C414159636562
El Paso UTEP C12/A125/X151271746670
Socorro Hueco C49/F312164626162
Skyline Park C72166757070
Chamizal C41/AH126 165726868
Ascarate Park SE C37/A332/A172/X159166676265
Waco Mazanec C103716064 *64 **62
Temple Georgia C1045164726466
Killeen Skylark Field C1047166686767
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643159646763
Nederland High School C1035 163656664
SETRPC 40 Sabine Pass C640/C1654167676767
Hamshire C64/C654169636565
West Orange C9/A141258617263
Port Arthur West C28/A128/A228164646765
Beaumont-Downtown C2/A112/C2002 260676463
Audubon C38162676464
Austin Northwest C3/A322264706566
Seabrook Friendship Park C45164676465
Houston Westhollow C410179716772
Hou.DeerPrk2 C35/235/1001/AFH139FP239162666965
Houston North Wayside C405162686464
Houston Monroe C406157596259
Conroe Relocated C78/A321171797374
Houston East C1/G316267707370
Channelview C15/AH115 361657266
Lake Jackson C1016 166656364
Baytown Garth C1017165738173
Park Place C416165727069
Houston Croquet C409267676566
Houston Aldine C8/AF108/X150 274747574
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)170   
Houston Bayland Park C53/A146 178747074
Clinton C403/C304/AH113 365776268
Northwest Harris Co. C26/A110/X154267746769
Manvel Croix Park C84169776771
Lang C408269706969
Galveston 99th St. C1034/A320/X183174737273
Lynchburg Ferry C1015/A165 15946 *6757
San Antonio
Camp Bullis C58 169727271
Calaveras Lake C59162656664
San Antonio Northwest C23271736770
Corpus Christi-Victoria
Victoria C87164636363
Corpus Christi West C4262605960
Corpus Christi Tuloso C21161616060
Lower Rio Grande Valley
Brownsville C80/AGP18015258  ** 
Mission C43/AP143152555955
Harlingen Teege C1023155595957
Laredo Vidaurri C44/AFGP144/P24415053 *54 **52
* 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 2018 (131 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.