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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 76 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, 2012, 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
5:12 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051170745967
Rockwall Heath C69180736472
Kaufman C71/A304/X071173756270
Dallas Executive Airport C402185746273
Parker County C76176746672
Granbury C73/C681180756673
Grapevine Fairway C70/A301/X182186837079
Dallas North No.2 C63/C679186776475
Pilot Point C1032178847278
Dallas Hinton St. C401/C60/AH161 387816678
Denton Airport South C56/A163/X157181857480
Ft. Worth Northwest C13/AH302 277847277
Midlothian OFW C52/A137178756271
Frisco C31/C680184786876
Italy C1044/A323171726067
Cleburne Airport C77/C682182776875
Arlington Municipal Airport C61192686575
Keller C17279806775
Greenville C1006/A198175706269
Eagle Mountain Lake C75 187776476
Longview C19/A127/C644278716471
Tyler Airport Relocated C82176716671
Karnack C85/AFHP303172706669
El Paso-Juarez
Ivanhoe C414157606259
El Paso UTEP C12/A125/X151274737273
Socorro Hueco C49/F312138 *666456
Skyline Park C72168666365
Chamizal C41/AH126 169696668
Ascarate Park SE C37/A332/A172/X159165605861
Waco Mazanec C1037173726369
Temple Georgia C10451 53 *67 
Killeen Skylark Field C1047178716972
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643170586062
Nederland High School C1035 169656566
SETRPC 40 Sabine Pass C640/C1654176676770
Hamshire C64/C654173666768
West Orange C9/A141272626365
Port Arthur West C28/A128/A228166 *646264
Beaumont-Downtown C2/A112/C2002 275656568
Audubon C38176706169
Austin Northwest C3/A322274696268
Seabrook Friendship Park C45186676572
Houston Westhollow C410181776173
Hou.DeerPrk2 C35/235/1001/AFH139FP239185696272
Houston North Wayside C405175706168
Houston Monroe C406185746474
Conroe Relocated C78/A321182756975
Houston East C1/G316283696672
Channelview C15/AH115 377616467
Lake Jackson C1016 171676166
Baytown Garth C1017171 *61 *6766
Park Place C416177796172
Houston Croquet C409279796373
Houston Aldine C8/AF108/X150 275746872
Houston Texas Avenue C411182725870
Houston Regional Office C81 (Deactivated Jun 25, 2012)175 *   
Houston Bayland Park C53/A146 177816173
Clinton C403/C304/AH113 381675868
Northwest Harris Co. C26/A110/X154282806074
Manvel Croix Park C84187846378
Lang C408281796274
Galveston 99th St. C1034/A320/X183181646570
Lynchburg Ferry C1015/A165 175645966
San Antonio
Camp Bullis C58187836578
Calaveras Lake C59170696367
San Antonio Northwest C23281766473
Corpus Christi-Victoria
Victoria C87166626062
Corpus Christi West C4269665864
Corpus Christi Tuloso C21165665863
Lower Rio Grande Valley
Brownsville C80/AGP180158586058
Mercedes C1048/A310 (Deactivated Oct 10, 2012)160   
Mission C43/AP143161555657
Harlingen Teege C1023150 *625957
Laredo Vidaurri C44/AFGP144/P244161 *655761
* The value shown for this site does not represent an entire year's worth of data (274 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 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.