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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
9:13 am CDT
Dallas-Fort Worth
Corsicana Airport C1051174606165
Rockwall Heath C69173666869
Kaufman C71/A304/X071175625965
Dallas Executive Airport C402174626165
Parker County C76174727072
Granbury C73/C681175736270
Grapevine Fairway C70/A301/X182183737276
Dallas North No.2 C63/C679177706972
Pilot Point C1032184757176
Dallas Hinton St. C401/C60/AH161 381667072
Denton Airport South C56/A163/X157185777779
Ft. Worth Northwest C13/AH302 284797378
Midlothian OFW C52/A137175626166
Frisco C31/C680178747074
Italy C1044/A323172606465
Cleburne Airport C77/C682177716470
Arlington Municipal Airport C61168656265
Keller C17280746573
Greenville C1006/A198170626064
Eagle Mountain Lake C75 177736571
Longview C19/A127/C644271666266
Tyler Airport Relocated C82171666266
Karnack C85/AFHP303170665864
El Paso-Juarez
Ivanhoe C414160626261
El Paso UTEP C12/A125/X151273706970
Socorro Hueco C49/F312166666565
Skyline Park C72166706567
Chamizal C41/AH126 169666667
Ascarate Park SE C37/A332/A172/X159160626462
Waco Mazanec C1037172636065
Temple Georgia C1045153 *676461
Killeen Skylark Field C1047171696267
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158625859
Nederland High School C1035 165676666
SETRPC 40 Sabine Pass C640/C1654167676064
Hamshire C64/C654166676566
West Orange C9/A141262636061
Port Arthur West C28/A128/A228164636564
Beaumont-Downtown C2/A112/C2002 265656665
Audubon C38170636365
Austin Northwest C3/A322269626465
Seabrook Friendship Park C45167657268
Houston Westhollow C410177707273
Hou.DeerPrk2 C35/235/1001/AFH139FP239169637067
Houston North Wayside C405170626666
Houston Monroe C406174656969
Conroe Relocated C78/A321175727072
Houston East C1/G316269667871
Channelview C15/AH115 361646764
Lake Jackson C1016 167616163
Baytown Garth C1017161 *677166
Park Place C416179667473
Houston Croquet C409279677172
Houston Aldine C8/AF108/X150 274687973
Houston Texas Avenue C411172586966
Houston Bayland Park C53/A146 181677173
Clinton C403/C304/AH113 367587065
Northwest Harris Co. C26/A110/X154280636770
Manvel Croix Park C84184717476
Lang C408279647673
Galveston 99th St. C1034/A320/X183164717369
Lynchburg Ferry C1015/A165 164597064
San Antonio
Camp Bullis C58183726774
Calaveras Lake C59169636064
San Antonio Northwest C23276696670
Corpus Christi-Victoria
Victoria C87162626763
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.