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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
5:12 am CST
Dallas-Fort Worth
Corsicana Airport C1051174604860
Rockwall Heath C69173665163
Kaufman C71/A304/X071175624962
Dallas Executive Airport C402174624560
Parker County C76174725165
Granbury C73/C681175734965
Grapevine Fairway C70/A301/X182183735169
Dallas North No.2 C63/C679177705166
Pilot Point C1032184755170
Dallas Hinton St. C401/C60/AH161 381664965
Denton Airport South C56/A163/X157185775371
Ft. Worth Northwest C13/AH302 284794669
Midlothian OFW C52/A137175624661
Frisco C31/C680178745368
Italy C1044/A323172604759
Cleburne Airport C77/C682177714965
Arlington Municipal Airport C61168654559
Keller C17280744867
Greenville C1006/A198170625060
Eagle Mountain Lake C75 177734765
Longview C19/A127/C644271665263
Tyler Airport Relocated C82171665564
Karnack C85/AFHP303170664961
El Paso-Juarez
Ivanhoe C414160625358
El Paso UTEP C12/A125/X151273705465
Socorro Hueco C49/F312166665361
Skyline Park C72166705563
Chamizal C41/AH126 169665463
Ascarate Park SE C37/A332/A172/X159160624957
Waco Mazanec C1037172635061
Temple Georgia C1045153 *675257
Killeen Skylark Field C1047171695565
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158624856
Nederland High School C1035 165675562
SETRPC 40 Sabine Pass C640/C1654167674760
Hamshire C64/C654166675863
West Orange C9/A141262634958
Port Arthur West C28/A128/A228164635560
Beaumont-Downtown C2/A112/C2002 265655561
Audubon C38170635462
Austin Northwest C3/A322269625261
Seabrook Friendship Park C45167655261
Houston Westhollow C410177704965
Hou.DeerPrk2 C35/235/1001/AFH139FP239169634960
Houston North Wayside C405170624258
Houston Monroe C406174654661
Conroe Relocated C78/A321175725768
Houston East C1/G316269664961
Channelview C15/AH115 361644757
Lake Jackson C1016 167615059
Baytown Garth C1017161 *675661
Park Place C416179664764
Houston Croquet C409279675065
Houston Aldine C8/AF108/X150 274685565
Houston Texas Avenue C411172584458
Houston Bayland Park C53/A146 181674965
Clinton C403/C304/AH113 367584356
Northwest Harris Co. C26/A110/X154280635064
Manvel Croix Park C84184715570
Lang C408279645164
Galveston 99th St. C1034/A320/X183164715463
Lynchburg Ferry C1015/A165 164594756
San Antonio
Camp Bullis C58183725369
Calaveras Lake C59169635261
San Antonio Northwest C23276695366
Corpus Christi-Victoria
Victoria C87162625058
Corpus Christi West C4266655060
Corpus Christi Tuloso C21166665161
Lower Rio Grande Valley
Brownsville C80/AGP180158604755
Mission C43/AP143155564251
Harlingen Teege C1023162594956
Laredo Vidaurri C44/AFGP144/P244165574355
* 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.