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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, 2020, 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 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051163676665
Rockwall Heath C69164636062
Kaufman C71/A304/X071165636865
Dallas Executive Airport C402167707771
Parker County C76168677369
Granbury C73/C681162658169
Grapevine Fairway C70/A301/X182177757575
Dallas North No.2 C63/C679169737271
Pilot Point C1032171857777
Dallas Hinton St. C401/C60/AH161 364746567
Denton Airport South C56/A163/X157171817876
Ft. Worth Northwest C13/AH302 275768077
Midlothian OFW C52/A1371616463 **62
Frisco C31/C680170817374
Italy C1044/A323160646663
Cleburne Airport C77/C682167758274
Arlington Municipal Airport C61168717772
Keller C17271747272
Greenville C1006/A198161656363
Eagle Mountain Lake C75 176767776
Longview C19/A127/C644255646461
Tyler Airport Relocated C82160657165
Karnack C85/AFHP303155616560
El Paso-Juarez
Ivanhoe C414/F514168646465
El Paso UTEP C12/A125/X151/G12527973  
Socorro Hueco C49/F312174717573
Ojo De Agua C1021/FG121/FG2211 7179 
Skyline Park C72171687270
Chamizal C41/AH126 172696869
Ascarate Park SE C37/A332/A172/X159169566864
Waco Mazanec C1037163676264
Temple Georgia C1045164676665
Killeen Skylark Field C1047163706967
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643160666262
Nederland 17th Street C10351576463 **61
SETRPC 40 Sabine Pass C640/C1654162606261
Hamshire C64/C654162626161
West Orange C9/A141262616061
Port Arthur West C28/A128/A228157655860
Beaumont-Downtown C2/A112/C2002 259656061
Audubon C38163656464
Austin North Hills Drive C3/A322246 *667060
Seabrook Friendship Park C45164605660
Houston Westhollow C410/C3003166717370
Hou.DeerPrk2 C35/235/1001/AFH139FP239173746671
Houston Harvard Street C4171 7977 
Houston North Wayside C405/C1033161656262
Houston Monroe C406162685963
Conroe Relocated C78/A321175707172
Houston East C1/G316267767372
Channelview C15/AH115 362686364
Lake Jackson C1016 165696767
Baytown Garth C1017166717169
Park Place C416170787173
Houston Croquet C409266837273
Houston Aldine C8/AF108/X150 268756469
Houston Bayland Park C53/A146 173788277
Clinton C403/C304/AH113 371707672
Northwest Harris Co. C26/A110/X154271697371
Manvel Croix Park C84170777273
Lang C408269717170
Galveston 99th St. C1034/A320/X183168707370
Lynchburg Ferry C1015/A165 161656363
San Antonio
Camp Bullis C58 174787174
Calaveras Lake C59166666565
San Antonio Northwest C23269706969
Corpus Christi-Victoria
Victoria C87160615759
Corpus Christi West C4261655961
Corpus Christi Tuloso C21164645661
Lower Rio Grande Valley
Mission C43/AP143155625758
Harlingen Teege C1023153565354
Laredo Vidaurri C44/AFGP144/P244 (Deactivated Jul 28, 2021)16060 *  
* 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 2022 (203 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.