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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
4:11 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051160644355
Rockwall Heath C69166714259
Kaufman C71/A304/X071162644356
Dallas Executive Airport C402162684056
Parker County C76172794766
Granbury C73/C681173734563
Grapevine Fairway C70/A301/X182173794264
Dallas North No.2 C63/C679170794263
Pilot Point C1032175794165
Dallas Hinton St. C401/C60/AH161 366804262
Denton Airport South C56/A163/X157177884469
Ft. Worth Northwest C13/AH302 279794266
Midlothian OFW C52/A137162684357
Frisco C31/C680174774164
Italy C1044/A323160664456
Cleburne Airport C77/C682171734663
Arlington Municipal Airport C61165694158
Keller C17274764464
Greenville C1006/A198162624456
Eagle Mountain Lake C75 173784565
Longview C19/A127/C644266684559
Tyler Airport Relocated C82166664860
Karnack C85/AFHP303166624457
El Paso-Juarez
Ivanhoe C414162653955
El Paso UTEP C12/A125/X151270723960
Socorro Hueco C49/F312166693958
Skyline Park C72170694360
Chamizal C41/AH126 166704159
Ascarate Park SE C37/A332/A172/X159162643654
Waco Mazanec C1037163684558
Temple Georgia C1045167724762
Killeen Skylark Field C1047169674761
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643162653855
Nederland High School C1035 167744562
SETRPC 40 Sabine Pass C640/C1654167644659
Hamshire C64/C654167684660
West Orange C9/A141263623954
Port Arthur West C28/A128/A228163754561
Beaumont-Downtown C2/A112/C2002 265694158
Audubon C38163734861
Austin Northwest C3/A322262734961
Seabrook Friendship Park C45165834263
Houston Westhollow C410170794364
Hou.DeerPrk2 C35/235/1001/AFH139FP239163774361
Houston North Wayside C405162783658
Houston Monroe C406165733758
Conroe Relocated C78/A321172734764
Houston East C1/G316266884867
Channelview C15/AH115 364813861
Lake Jackson C1016 161654858
Baytown Garth C1017167774362
Park Place C416166873763
Houston Croquet C409267794363
Houston Aldine C8/AF108/X150 268954569
Houston Texas Avenue C411158853860
Houston Bayland Park C53/A146 167804162
Clinton C403/C304/AH113 358843860
Northwest Harris Co. C26/A110/X154263784261
Manvel Croix Park C84171864667
Lang C408264914265
Galveston 99th St. C1034/A320/X183171844968
Lynchburg Ferry C1015/A165 159793858
San Antonio
Camp Bullis C58172804766
Calaveras Lake C59163684358
San Antonio Northwest C23269794564
Corpus Christi-Victoria
Victoria C87162704759
Corpus Christi West C4265654558
Corpus Christi Tuloso C21166624357
Lower Rio Grande Valley
Brownsville C80/AGP180160604454
Mission C43/AP143156583750
Harlingen Teege C1023159584453
Laredo Vidaurri C44/AFGP144/P244157563850

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.