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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, 2013, 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
5:11 pm CST
Dallas-Fort Worth
Corsicana Airport C1051174603957
Rockwall Heath C69173664160
Kaufman C71/A304/X071175623858
Dallas Executive Airport C402174623557
Parker County C76174724363
Granbury C73/C681175733761
Grapevine Fairway C70/A301/X182183733864
Dallas North No.2 C63/C679177703761
Pilot Point C1032184753865
Dallas Hinton St. C401/C60/AH161 381663661
Denton Airport South C56/A163/X157185774067
Ft. Worth Northwest C13/AH302 284793766
Midlothian OFW C52/A137175623858
Frisco C31/C680178743863
Italy C1044/A323172603555
Cleburne Airport C77/C682177713962
Arlington Municipal Airport C61168653656
Keller C17280743663
Greenville C1006/A198170623957
Eagle Mountain Lake C75 177733762
Longview C19/A127/C644271664460
Tyler Airport Relocated C82171664259
Karnack C85/AFHP303170664159
El Paso-Juarez
Ivanhoe C414160623251
El Paso UTEP C12/A125/X151273703559
Socorro Hueco C49/F312166663455
Skyline Park C72166703858
Chamizal C41/AH126 169663456
Ascarate Park SE C37/A332/A172/X159160623050
Waco Mazanec C1037172634058
Temple Georgia C1045153 *674254
Killeen Skylark Field C1047171694561
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158624454
Nederland High School C1035 165674559
SETRPC 40 Sabine Pass C640/C1654167674158
Hamshire C64/C654166674860
West Orange C9/A141262634356
Port Arthur West C28/A128/A228164634557
Beaumont-Downtown C2/A112/C2002 265654759
Audubon C38170634559
Austin Northwest C3/A322269623956
Seabrook Friendship Park C45167654057
Houston Westhollow C410177704062
Hou.DeerPrk2 C35/235/1001/AFH139FP239169633856
Houston North Wayside C405170623656
Houston Monroe C406174653758
Conroe Relocated C78/A321175724463
Houston East C1/G316269664158
Channelview C15/AH115 361643754
Lake Jackson C1016 167614858
Baytown Garth C1017161 *674557
Park Place C416179664061
Houston Croquet C409279674262
Houston Aldine C8/AF108/X150 274684562
Houston Texas Avenue C411172583454
Houston Bayland Park C53/A146 181674062
Clinton C403/C304/AH113 367583352
Northwest Harris Co. C26/A110/X154280634161
Manvel Croix Park C84184714566
Lang C408279643960
Galveston 99th St. C1034/A320/X183164714459
Lynchburg Ferry C1015/A165 164593251
San Antonio
Camp Bullis C58183724265
Calaveras Lake C59169634358
San Antonio Northwest C23276694162
Corpus Christi-Victoria
Victoria C87162624255
Corpus Christi West C4266654157
Corpus Christi Tuloso C21166664358
Lower Rio Grande Valley
Brownsville C80/AGP180158603751
Mission C43/AP143155562946
Harlingen Teege C1023162594254
Laredo Vidaurri C44/AFGP144/P244165573552
* 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.