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 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
8:10 am CDT
Dallas-Fort Worth
Corsicana Airport C1051160645559
Rockwall Heath C69166715764
Kaufman C71/A304/X071162645460
Dallas Executive Airport C402162685260
Parker County C76172795970
Granbury C73/C681173735767
Grapevine Fairway C70/A301/X182173795870
Dallas North No.2 C63/C679170795869
Pilot Point C1032175795770
Dallas Hinton St. C401/C60/AH161 366805667
Denton Airport South C56/A163/X157177885974
Ft. Worth Northwest C13/AH302 279795671
Midlothian OFW C52/A137162685762
Frisco C31/C680174775869
Italy C1044/A323160665660
Cleburne Airport C77/C682171735967
Arlington Municipal Airport C61165695362
Keller C17274765769
Greenville C1006/A198162625559
Eagle Mountain Lake C75 173785769
Longview C19/A127/C644266685563
Tyler Airport Relocated C82166665763
Karnack C85/AFHP303166625761
El Paso-Juarez
Ivanhoe C414162655159
El Paso UTEP C12/A125/X151270725565
Socorro Hueco C49/F312166695663
Skyline Park C72170695564
Chamizal C41/AH126 166705664
Ascarate Park SE C37/A332/A172/X159162645058
Waco Mazanec C1037163685762
Temple Georgia C1045167725966
Killeen Skylark Field C1047169675965
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643162654958
Nederland High School C1035 167745966
SETRPC 40 Sabine Pass C640/C1654167646364
Hamshire C64/C654167685964
West Orange C9/A141263625560
Port Arthur West C28/A128/A228163755965
Beaumont-Downtown C2/A112/C2002 265695663
Audubon C38163736065
Austin Northwest C3/A322262736265
Seabrook Friendship Park C45165835868
Houston Westhollow C410170796170
Hou.DeerPrk2 C35/235/1001/AFH139FP239163776066
Houston North Wayside C405162785464
Houston Monroe C406165734962
Conroe Relocated C78/A321172736369
Houston East C1/G316266886171
Channelview C15/AH115 364815566
Lake Jackson C1016 161656162
Baytown Garth C1017167776168
Park Place C416166876071
Houston Croquet C409267796169
Houston Aldine C8/AF108/X150 268956977
Houston Texas Avenue C411158855666
Houston Bayland Park C53/A146 167806771
Clinton C403/C304/AH113 358845967
Northwest Harris Co. C26/A110/X154263786167
Manvel Croix Park C84171866273
Lang C408264916372
Galveston 99th St. C1034/A320/X183171846874
Lynchburg Ferry C1015/A165 159795664
San Antonio
Camp Bullis C58 172806371
Calaveras Lake C59163685762
San Antonio Northwest C23269795969
Corpus Christi-Victoria
Victoria C87162705763
Corpus Christi West C4265655963
Corpus Christi Tuloso C21166625661
Lower Rio Grande Valley
Brownsville C80/AGP180160605056
Mission C43/AP143156585054
Harlingen Teege C1023159585356
Laredo Vidaurri C44/AFGP144/P244157564853

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.