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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
3:12 am CST
Dallas-Fort Worth
Corsicana Airport C1051174606064
Rockwall Heath C69173666367
Kaufman C71/A304/X071175625865
Dallas Executive Airport C402174625664
Parker County C76174725968
Granbury C73/C681175735969
Grapevine Fairway C70/A301/X182183735871
Dallas North No.2 C63/C679177706069
Pilot Point C1032184756273
Dallas Hinton St. C401/C60/AH161 381665567
Denton Airport South C56/A163/X157185776174
Ft. Worth Northwest C13/AH302 284795974
Midlothian OFW C52/A137175625965
Frisco C31/C680178746171
Italy C1044/A323172605963
Cleburne Airport C77/C682177715768
Arlington Municipal Airport C61168655964
Keller C17280745469
Greenville C1006/A198170625963
Eagle Mountain Lake C75 177735468
Longview C19/A127/C644271666166
Tyler Airport Relocated C82171666266
Karnack C85/AFHP303170665864
El Paso-Juarez
Ivanhoe C414160625659
El Paso UTEP C12/A125/X151273706168
Socorro Hueco C49/F312166666064
Skyline Park C72166706366
Chamizal C41/AH126 169666065
Ascarate Park SE C37/A332/A172/X159160625659
Waco Mazanec C1037172635964
Temple Georgia C1045153 *676461
Killeen Skylark Field C1047171696267
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158625558
Nederland High School C1035 165676264
SETRPC 40 Sabine Pass C640/C1654167675663
Hamshire C64/C654166676164
West Orange C9/A141262635961
Port Arthur West C28/A128/A228164635962
Beaumont-Downtown C2/A112/C2002 265656264
Audubon C38170636365
Austin Northwest C3/A322269626164
Seabrook Friendship Park C45167656264
Houston Westhollow C410177706269
Hou.DeerPrk2 C35/235/1001/AFH139FP239169635963
Houston North Wayside C405170625863
Houston Monroe C406174655865
Conroe Relocated C78/A321175726871
Houston East C1/G316269666566
Channelview C15/AH115 361645660
Lake Jackson C1016 167615962
Baytown Garth C1017161 *676664
Park Place C416179666469
Houston Croquet C409279676470
Houston Aldine C8/AF108/X150 274687271
Houston Texas Avenue C411172586163
Houston Bayland Park C53/A146 181676571
Clinton C403/C304/AH113 367584657
Northwest Harris Co. C26/A110/X154280636368
Manvel Croix Park C84184716673
Lang C408279646970
Galveston 99th St. C1034/A320/X183164716867
Lynchburg Ferry C1015/A165 164595960
San Antonio
Camp Bullis C58183726071
Calaveras Lake C59169636064
San Antonio Northwest C23276696068
Corpus Christi-Victoria
Victoria C87162625660
Corpus Christi West C4266655562
Corpus Christi Tuloso C21166665462
Lower Rio Grande Valley
Brownsville C80/AGP180158605156
Mission C43/AP143155564953
Harlingen Teege C1023162595358
Laredo Vidaurri C44/AFGP144/P244165575458
* 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.