Skip to main content

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
2:11 am CDT
Dallas-Fort Worth
Corsicana Airport C1051160656764
Rockwall Heath C69161677868
Kaufman C71/A304/X071157626561
Dallas Executive Airport C402162637566
Parker County C76168657569
Granbury C73/C681163667166
Grapevine Fairway C70/A301/X182175738276
Dallas North No.2 C63/C679167778175
Pilot Point C1032175687472
Dallas Hinton St. C401/C60/AH161 369758074
Denton Airport South C56/A163/X157176737675
Ft. Worth Northwest C13/AH302 266737671
Midlothian OFW C52/A137160676865
Frisco C31/C680173728175
Italy C1044/A323160666965
Cleburne Airport C77/C682172758176
Arlington Municipal Airport C61161717669
Keller C17270757874
Greenville C1006/A198158667365
Eagle Mountain Lake C75 167707570
Longview C19/A127/C644265626865
Tyler Airport Relocated C82163636965
Karnack C85/AFHP303159636161
El Paso-Juarez
Ivanhoe C414/F514159637465
El Paso UTEP C12/A125/X151/G125271747673
Socorro Hueco C49/F312164627065
Skyline Park C72166757772
Chamizal C41/AH126 165727871
Ascarate Park SE C37/A332/A172/X159166677569
Waco Mazanec C103716064 *6864
Temple Georgia C1045164726968
Killeen Skylark Field C1047166687268
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643159647265
Nederland High School C1035 163656765
SETRPC 40 Sabine Pass C640/C1654167677168
Hamshire C64/C654169636967
West Orange C9/A141258617364
Port Arthur West C28/A128/A228164647066
Beaumont-Downtown C2/A112/C2002 260676865
Audubon C38162677066
Austin Northwest C3/A322264707268
Seabrook Friendship Park C45164678271
Houston Westhollow C410179716973
Hou.DeerPrk2 C35/235/1001/AFH139FP239162668571
Houston North Wayside C405162686665
Houston Monroe C406157596861
Conroe Relocated C78/A321171797575
Houston East C1/G316267708273
Channelview C15/AH115 361657968
Lake Jackson C1016 166656766
Baytown Garth C1017165738173
Park Place C416165727771
Houston Croquet C409267677068
Houston Aldine C8/AF108/X150 274748878
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)170   
Houston Bayland Park C53/A146 178747776
Clinton C403/C304/AH113 365776870
Northwest Harris Co. C26/A110/X154267747772
Manvel Croix Park C84169777172
Lang C408269707471
Galveston 99th St. C1034/A320/X183174737674
Lynchburg Ferry C1015/A165 15946 *7459
San Antonio
Camp Bullis C58 169727371
Calaveras Lake C59162657166
San Antonio Northwest C23271737272
Corpus Christi-Victoria
Victoria C87164636664
Corpus Christi West C4262606161
Corpus Christi Tuloso C21161616060
Lower Rio Grande Valley
Brownsville C80/AGP18015258  ** 
Mission C43/AP143152555955
Harlingen Teege C1023155595957
Laredo Vidaurri C44/AFGP144/P24415053 *5853
* 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 (258 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.