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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 pm CDT
Dallas-Fort Worth
Corsicana Airport C1051174606365
Rockwall Heath C69173667170
Kaufman C71/A304/X071175626366
Dallas Executive Airport C402174626868
Parker County C76174727674
Granbury C73/C681175737373
Grapevine Fairway C70/A301/X182183737978
Dallas North No.2 C63/C679177707975
Pilot Point C1032184757879
Dallas Hinton St. C401/C60/AH161 381668075
Denton Airport South C56/A163/X157185778883
Ft. Worth Northwest C13/AH302 284797980
Midlothian OFW C52/A137175626868
Frisco C31/C680178747776
Italy C1044/A323172606465
Cleburne Airport C77/C682177716972
Arlington Municipal Airport C61168656967
Keller C17280747676
Greenville C1006/A198170626164
Eagle Mountain Lake C75 177737876
Longview C19/A127/C644271666868
Tyler Airport Relocated C82171666467
Karnack C85/AFHP303170665864
El Paso-Juarez
Ivanhoe C414160626562
El Paso UTEP C12/A125/X151273707271
Socorro Hueco C49/F312166666866
Skyline Park C72166706968
Chamizal C41/AH126 169666767
Ascarate Park SE C37/A332/A172/X159160626462
Waco Mazanec C1037172636767
Temple Georgia C1045153 *677264
Killeen Skylark Field C1047171696668
Beaumont-Port Arthur
SETRPC 43 Jefferson Co Airport C643158626561
Nederland High School C1035 165677268
SETRPC 40 Sabine Pass C640/C1654167676466
Hamshire C64/C654166676867
West Orange C9/A141262636663
Port Arthur West C28/A128/A228164637567
Beaumont-Downtown C2/A112/C2002 265656765
Audubon C38170637168
Austin Northwest C3/A322269627368
Seabrook Friendship Park C45167658371
Houston Westhollow C410177707473
Hou.DeerPrk2 C35/235/1001/AFH139FP239169637769
Houston North Wayside C405170627870
Houston Monroe C406174657370
Conroe Relocated C78/A321175727072
Houston East C1/G316269668874
Channelview C15/AH115 361648168
Lake Jackson C1016 167616263
Baytown Garth C1017161 *677567
Park Place C416179668777
Houston Croquet C409279677874
Houston Aldine C8/AF108/X150 274688977
Houston Texas Avenue C411172587969
Houston Bayland Park C53/A146 181677975
Clinton C403/C304/AH113 367588469
Northwest Harris Co. C26/A110/X154280637271
Manvel Croix Park C84184718680
Lang C408279649178
Galveston 99th St. C1034/A320/X183164718372
Lynchburg Ferry C1015/A165 164597967
San Antonio
Camp Bullis C58183727978
Calaveras Lake C59169636666
San Antonio Northwest C23276697874
Corpus Christi-Victoria
Victoria C87162627064
Corpus Christi West C4266656565
Corpus Christi Tuloso C21166666264
Lower Rio Grande Valley
Brownsville C80/AGP180158605156
Mission C43/AP143155565154
Harlingen Teege C1023162595358
Laredo Vidaurri C44/AFGP144/P244165575559
* 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.