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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
2:11 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051174604860
Rockwall Heath C69173664661
Kaufman C71/A304/X071175624460
Dallas Executive Airport C402174624460
Parker County C76174724864
Granbury C73/C681175734464
Grapevine Fairway C70/A301/X182183734466
Dallas North No.2 C63/C679177704564
Pilot Point C1032184754367
Dallas Hinton St. C401/C60/AH161 381664463
Denton Airport South C56/A163/X157185774468
Ft. Worth Northwest C13/AH302 284794168
Midlothian OFW C52/A137175624360
Frisco C31/C680178744264
Italy C1044/A323172604258
Cleburne Airport C77/C682177714564
Arlington Municipal Airport C61168654057
Keller C17280744064
Greenville C1006/A198170624358
Eagle Mountain Lake C75 177734063
Longview C19/A127/C644271664460
Tyler Airport Relocated C82171665162
Karnack C85/AFHP303170664660
El Paso-Juarez
Ivanhoe C414160623853
El Paso UTEP C12/A125/X151273703960
Socorro Hueco C49/F312166663957
Skyline Park C72166704460
Chamizal C41/AH126 169664058
Ascarate Park SE C37/A332/A172/X159160623552
Waco Mazanec C1037172634961
Temple Georgia C1045153 *675056
Killeen Skylark Field C1047171695364
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158624655
Nederland High School C1035 165674960
SETRPC 40 Sabine Pass C640/C1654167674660
Hamshire C64/C654166675261
West Orange C9/A141262634757
Port Arthur West C28/A128/A228164634958
Beaumont-Downtown C2/A112/C2002 265655060
Audubon C38170635061
Austin Northwest C3/A322269624960
Seabrook Friendship Park C45167654659
Houston Westhollow C410177704463
Hou.DeerPrk2 C35/235/1001/AFH139FP239169634458
Houston North Wayside C405170623656
Houston Monroe C406174654059
Conroe Relocated C78/A321175725266
Houston East C1/G316269664158
Channelview C15/AH115 361644055
Lake Jackson C1016 167615059
Baytown Garth C1017161 *675360
Park Place C416179664563
Houston Croquet C409279674864
Houston Aldine C8/AF108/X150 274684662
Houston Texas Avenue C411172584056
Houston Bayland Park C53/A146 181674664
Clinton C403/C304/AH113 367583954
Northwest Harris Co. C26/A110/X154280634763
Manvel Croix Park C84184714968
Lang C408279644362
Galveston 99th St. C1034/A320/X183164715262
Lynchburg Ferry C1015/A165 164593954
San Antonio
Camp Bullis C58183725068
Calaveras Lake C59169635161
San Antonio Northwest C23276695165
Corpus Christi-Victoria
Victoria C87162624857
Corpus Christi West C4266654659
Corpus Christi Tuloso C21166664860
Lower Rio Grande Valley
Brownsville C80/AGP180158604654
Mission C43/AP143155563548
Harlingen Teege C1023162594856
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.