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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, 2014, 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
2:14 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051160646061
Rockwall Heath C69166716166
Kaufman C71/A304/X071162645761
Dallas Executive Airport C402162686264
Parker County C76172796873
Granbury C73/C681173736369
Grapevine Fairway C70/A301/X182173797575
Dallas North No.2 C63/C679170796772
Pilot Point C1032175797576
Dallas Hinton St. C401/C60/AH161 366806971
Denton Airport South C56/A163/X157177887680
Ft. Worth Northwest C13/AH302 279796674
Midlothian OFW C52/A137162686063
Frisco C31/C680174777374
Italy C1044/A323160666062
Cleburne Airport C77/C682171737272
Arlington Municipal Airport C61165696165
Keller C17274767073
Greenville C1006/A198162625860
Eagle Mountain Lake C75 173786772
Longview C19/A127/C644266686566
Tyler Airport Relocated C82166666365
Karnack C85/AFHP303166625962
El Paso-Juarez
Ivanhoe C414162655962
El Paso UTEP C12/A125/X151270727171
Socorro Hueco C49/F312166696466
Skyline Park C72170696668
Chamizal C41/AH126 166706567
Ascarate Park SE C37/A332/A172/X159162646664
Waco Mazanec C1037163686063
Temple Georgia C1045167726467
Killeen Skylark Field C1047169676667
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643162655962
Nederland High School C1035 167746368
SETRPC 40 Sabine Pass C640/C1654167646766
Hamshire C64/C654167686968
West Orange C9/A141263625861
Port Arthur West C28/A128/A228163756467
Beaumont-Downtown C2/A112/C2002 265696064
Audubon C38163736266
Austin Northwest C3/A322262736466
Seabrook Friendship Park C45165836470
Houston Westhollow C410170797976
Hou.DeerPrk2 C35/235/1001/AFH139FP239163776267
Houston North Wayside C405162786267
Houston Monroe C406165735765
Conroe Relocated C78/A321172737172
Houston East C1/G316266886773
Channelview C15/AH115 364816168
Lake Jackson C1016 161656664
Baytown Garth C1017167776569
Park Place C416166876572
Houston Croquet C409267796771
Houston Aldine C8/AF108/X150 268957479
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)158857071
Houston Bayland Park C53/A146 167807875
Clinton C403/C304/AH113 358846569
Northwest Harris Co. C26/A110/X154263786769
Manvel Croix Park C84171866975
Lang C408264916974
Galveston 99th St. C1034/A320/X183171847476
Lynchburg Ferry C1015/A165 159795965
San Antonio
Camp Bullis C58 172806973
Calaveras Lake C59163686264
San Antonio Northwest C23269797173
Corpus Christi-Victoria
Victoria C87162706465
Corpus Christi West C4265656264
Corpus Christi Tuloso C21166626163
Lower Rio Grande Valley
Brownsville C80/AGP180160605257
Mission C43/AP143156585255
Harlingen Teege C1023159585557
Laredo Vidaurri C44/AFGP144/P244157565054

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.