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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, 2016, 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
1:10 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051160653754
Rockwall Heath C69161673654
Kaufman C71/A304/X071157623752
Dallas Executive Airport C402162633252
Parker County C76168653656
Granbury C73/C681163663554
Grapevine Fairway C70/A301/X182175733260
Dallas North No.2 C63/C679167773258
Pilot Point C1032175683258
Dallas Hinton St. C401/C60/AH161 369753359
Denton Airport South C56/A163/X157176733160
Ft. Worth Northwest C13/AH302 266733056
Midlothian OFW C52/A137160673453
Frisco C31/C6801737229 **58
Italy C1044/A323160663353
Cleburne Airport C77/C682172753560
Arlington Municipal Airport C61161713355
Keller C17270753359
Greenville C1006/A198158663653
Eagle Mountain Lake C75 167703557
Longview C19/A127/C644265623554
Tyler Airport Relocated C82163633854
Karnack C85/AFHP303159633652
El Paso-Juarez
Ivanhoe C414159633753
El Paso UTEP C12/A125/X151271743660
Socorro Hueco C49/F312164623453
Skyline Park C72166753859
Chamizal C41/AH126 165723356
Ascarate Park SE C37/A332/A172/X159166673455
Waco Mazanec C1037160693554
Temple Georgia C1045164723757
Killeen Skylark Field C1047166683957
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643159643653
Nederland High School C1035 163653654
SETRPC 40 Sabine Pass C640/C1654167673656
Hamshire C64/C654169633656
West Orange C9/A141258613451
Port Arthur West C28/A128/A228164643454
Beaumont-Downtown C2/A112/C2002 260673453
Audubon C38162673755
Austin Northwest C3/A322264703757
Seabrook Friendship Park C45164673254
Houston Westhollow C410179713361
Hou.DeerPrk2 C35/235/1001/AFH139FP239162663253
Houston North Wayside C405162682852
Houston Monroe C406157592848
Conroe Relocated C78/A321171793963
Houston East C1/G316267703156
Channelview C15/AH115 361653252
Lake Jackson C1016 166654057
Baytown Garth C1017165733758
Park Place C416165723055
Houston Croquet C409267673255
Houston Aldine C8/AF108/X150 274743360
Houston Texas Avenue C411 (Deactivated Oct 24, 2016)170   
Houston Bayland Park C53/A146 178742960
Clinton C403/C304/AH113 365773157
Northwest Harris Co. C26/A110/X154267743558
Manvel Croix Park C84169773660
Lang C408269703056
Galveston 99th St. C1034/A320/X183174733761
Lynchburg Ferry C1015/A165 15946 *3145
San Antonio
Camp Bullis C58 169723859
Calaveras Lake C59162654055
San Antonio Northwest C23271733760
Corpus Christi-Victoria
Victoria C87164633654
Corpus Christi West C4262604254
Corpus Christi Tuloso C21161613753
Lower Rio Grande Valley
Brownsville C80/AGP1801525820 **43
Mission C43/AP143152553848
Harlingen Teege C1023155594252
Laredo Vidaurri C44/AFGP144/P244150532944
* 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 2018 (13 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.