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Four Highest Eight-Hour Ozone Concentrations in 2014
as of April 16

Use this form to retrieve the four highest eight-hour ozone concentration averages from data collected at TCEQ monitoring sites beginning December 14, 2005 through today. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly. All times shown are in Local Standard Time.

The table below lists the four highest daily maximum eight-hour ozone concentrations measured in 2014 in each community where the TCEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) The fourth-highest average is in bold black (unless it is highlighted). All ozone measurements are in parts per billion. Times are shown in 24-hour format and correspond to the beginning of the eight hour average.

Use the selection boxes below to customize this report. You may select a different year or a different report format. If you want to cut and paste data from this web 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
Highlight with AQI colors
Area Monitoring Site POC Highest Second Highest Third Highest Fourth Highest
Date Time Value Date Time Value Date Time Value Date Time Value
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 204/09/201412006004/10/201411005703/30/201411005604/15/2014110054
Keller C17204/09/201413006003/30/201412005504/10/201412005404/15/2014110052
Frisco C31/C680104/09/201412006104/10/201411005803/18/201412005703/21/2014110054
Midlothian OFW C52/A137104/09/201412006204/10/201411005603/18/201412005503/20/2014110051
Denton Airport South C56/A163/X157104/09/201413006404/10/201411005803/30/201412005804/11/2014110057
Arlington Municipal Airport C61104/09/201412006104/10/201411005403/18/201412005403/30/2014110052
Dallas North No.2 C63/C679104/09/201412006204/10/201411005903/18/201412005703/30/2014120054
Rockwall Heath C69103/18/201411006004/09/201412005903/20/201411005604/10/2014100055
Grapevine Fairway C70/A301/X182104/09/201412006104/10/201411005803/18/201412005804/14/2014110054
Kaufman C71/A304/X071104/09/201412005503/18/201410005403/20/201411005303/13/2014120052
Granbury C73/C681104/09/201414005803/07/201413005803/30/201412005704/10/2014120055
Eagle Mountain Lake C75 104/09/201413005803/30/201412005404/10/201412005304/15/2014110051
Parker County C76104/09/201413006103/30/201412006003/07/201413006004/10/2014110058
Cleburne Airport C77/C682104/09/201413006404/10/201411005803/30/201411005703/18/2014130055
Dallas Hinton St. C401/C60/AH161 304/09/201412006204/10/201411005603/18/201412005603/21/2014100052
Dallas Executive Airport C402104/09/201412005804/10/201410005403/30/201413005203/18/2014110052
Greenville C1006/A198103/18/201411005504/09/201411005403/20/201410005403/13/2014130054
Pilot Point C1032104/10/201411006004/09/201412006003/18/201411005704/11/2014110056
Italy C1044/A323104/09/201410006304/10/201410005403/18/201411005404/15/2014110052
Corsicana Airport C1051104/09/201410005303/30/201412005203/13/201411005002/22/2014110050
Tyler-Longview-Marshall
Longview C19/A127/C644203/18/201412006104/10/201413005903/21/201410005804/09/2014100053
Tyler Airport Relocated C82104/10/201413005704/09/201411005603/21/201409005503/20/2014120055
Karnack C85/AFHP303103/21/201409006004/09/201410005803/18/201411005804/10/2014100057
El Paso-Juarez
El Paso UTEP C12/A125/X151204/05/201414005604/03/201410005503/29/201410005404/06/2014100053
Ascarate Park SE C37/A332/A172/X159104/05/201414004904/03/201409004904/07/201411004604/06/2014090046
Chamizal C41/AH126 103/30/201412005203/16/201410005204/13/201409005103/18/2014090051
Socorro Hueco C49/F312104/08/201411005504/03/201409005304/06/201410005104/05/2014120051
Skyline Park C72104/05/201414005404/03/201409005304/06/201411005004/02/2014140050
BRAVO Big Bend C67/C316/C656/C6913 N04/06/201411005804/13/201413005604/10/201408005603/31/2014130055
Ivanhoe C414104/05/201413005604/03/201409005604/08/201411005304/06/2014090053
Cd Juarez Delphi C6631 N04/05/201414004404/06/201412004204/02/201420004204/03/2014080041
Waco
Waco Mazanec C1037104/09/201411006303/18/201411005604/10/201410005303/13/2014110053
Temple Georgia C1045104/09/201411006703/18/201411006004/10/201410005803/13/2014110056
Killeen Skylark Field C1047104/09/201411006603/18/201412006203/07/201412006104/10/2014100058
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 203/18/201410005503/13/201410005004/15/201410004703/11/2014100047
West Orange C9/A141204/09/201412006304/10/201409005603/18/201410005503/20/2014110054
Port Arthur West C28/A128/A228104/09/201412005403/18/201410005304/10/201409005203/20/2014110052
Hamshire C64/C654104/09/201409005903/18/201410005704/10/201409005503/20/2014110055
SETRPC Port Arthur C6281 N04/09/201410004904/10/201408004703/18/201410004603/20/2014100044
SETRPC 40 Sabine Pass C640/C1654104/11/201406005004/15/201410004704/12/201408004701/22/2014100042
SETRPC Mauriceville 42 C642/C311/C6651 N04/09/201410005904/10/201410005503/18/201409005303/20/2014110050
SETRPC 43 Jefferson Co Airport C643104/09/201411005403/18/201410005304/10/201409005203/30/2014110046
Nederland High School C1035 104/09/201411005904/10/201409005603/18/201409005603/20/2014110053
Austin
Austin Northwest C3/A322204/09/201411006003/18/201411005503/20/201411005403/07/2014110054
Audubon C38104/09/201411006103/18/201411005604/10/201411005403/20/2014110054
Fayette County C6012 N04/15/201411005504/14/2014150042No DataNo Data
Houston-Galveston-Brazoria
Houston East C1/G316203/20/201411006304/09/201410005703/18/201409005404/10/2014090053
Houston Aldine C8/AF108/X150 204/09/201412005903/20/201411005704/10/201410005303/21/2014110052
Channelview C15/AH115 303/20/201410005303/18/201409005104/09/201411004904/10/2014080048
Northwest Harris Co. C26/A110/X154204/09/201412005303/20/201411004803/30/201411004703/07/2014130047
Hou.DeerPrk2 C35/235/1001/AFH139FP239104/09/201410005304/10/201408004804/08/201412004603/21/2014100046
Seabrook Friendship Park C45104/09/201411005603/18/201408005103/13/201412005004/10/2014070049
Houston Bayland Park C53/A146 104/09/201410005703/07/201412005103/18/201409004903/25/2014110048
Conroe Relocated C78/A321104/09/201412006404/10/201409005903/21/201411005803/18/2014100058
Manvel Croix Park C84103/20/201411005804/09/201410005604/08/201412005103/07/2014110051
Clinton C403/C304/AH113 303/20/201411005704/09/201412005004/15/201410004603/25/2014100046
Houston North Wayside C405104/09/201411005504/10/201409005103/20/201411005103/21/2014100049
Houston Monroe C406104/09/201411005703/20/201411005504/10/201408005403/18/2014090052
Lang C408204/09/201411005903/20/201411005903/18/201409005104/08/2014110049
Houston Croquet C409203/20/201411006304/09/201410005603/07/201410005003/21/2014110049
Houston Westhollow C410103/20/201412005604/09/201411005503/25/201410005003/07/2014120050
Houston Texas Avenue C411103/20/201411005203/25/201411004504/10/201410004403/18/2014090044
Park Place C416103/20/201411006804/09/201411005804/10/201408005103/18/2014090051
Sheldon C5511 N04/09/201411005103/20/201410005002/14/201412004903/18/2014090048
Baytown Wetlands Center C5521 N04/09/201411005202/22/201410005004/07/201411004603/18/2014090046
Crosby Library C5531 N04/09/201410006203/18/201409005204/10/201408005103/20/2014110050
West Houston C5541 N03/20/201411006204/09/201411005803/25/201411005403/21/2014100054
La Porte Sylvan Beach C5561 N04/09/201411005603/18/201409005304/10/201408005202/22/2014110051
Mercer Arboretum C5571 N04/09/201412005704/10/201409005003/30/201410004803/31/2014100047
Tom Bass C5581 N04/09/201411005203/20/201411005203/07/201411004802/22/2014110048
Katy Park C5591 N04/09/201410005303/20/201411005303/25/201410004903/07/2014120049
Atascocita C5601 N04/09/201411005604/10/201408005203/20/201410004903/18/2014090049
Meyer Park C5611 N04/09/201411005603/20/201411005403/07/201413005404/10/2014100050
Bunker Hill Village C5621 N03/20/201412005503/07/201411005003/21/201410004903/18/2014100049
Huffman Wolf Road C5631 N04/09/201410006403/18/201409005204/10/201409005104/08/2014120046
HRM-3 Haden Road C603/A114 1 N03/20/201410006004/10/201408005204/15/201410004804/08/2014110048
Wallisville Road C617 1 N04/09/201410006503/20/201411005904/08/201412005503/18/2014080055
Danciger C618 1 N03/20/201411005803/25/201412005704/09/201410005404/04/2014110052
Mustang Bayou C619 1 N04/09/201411005803/20/201412005603/07/201411005603/18/2014080055
Texas City 34th St. C620 1 N04/07/201413005804/09/201410005603/18/201408005204/08/2014120051
UH Moody Tower C6951 N03/20/201411006904/09/201412006504/10/201409005503/21/2014100055
U of H-Sugarland C6961 N04/09/201411005404/10/201409004804/15/201411004604/05/2014100046
UH Coastal Center C6971 N04/07/201413005303/20/201412005203/18/201409005203/07/2014110052
UH WG Jones Forest C6981 N04/09/201412006404/10/201410005803/20/201412005803/30/2014120056
UH West Liberty C6991 N04/09/201412007403/18/201409006304/10/201408006003/21/2014100058
Lynchburg Ferry C1015/A165 104/10/201408004804/09/201412004803/18/201409004804/08/2014110044
Lake Jackson C1016 104/09/201410005703/25/201411005504/04/201411005204/15/2014110051
Baytown Garth C1017104/09/201410006003/20/201411005603/18/201408005204/10/2014080051
Galveston 99th St. C1034/A320/X183104/07/201413006304/09/201417005704/10/201411005303/18/2014010051
San Antonio
San Antonio Northwest C23203/20/201410005903/25/201411005602/15/201412005603/07/2014130055
Camp Bullis C58103/20/201411006404/09/201409006303/07/201413006102/15/2014110061
Calaveras Lake C59103/07/201412005904/09/201411005802/15/201411005703/25/2014120056
Elm Creek Elementary C5011 N04/09/201411005603/30/201410005303/29/201410005304/15/2014110052
Fair Oaks Ranch C5021 N04/09/201411006004/11/201411005404/10/201411005403/30/2014110054
Bulverde Elementary C5031 N04/09/201411006504/10/201411005604/15/201411005404/11/2014110054
New Braunfels Airport C5041 N04/09/201410005804/15/201411005204/10/201410005103/30/2014110050
City of Garden Ridge C5051 N04/09/201411005204/04/201412004704/10/201410004603/29/2014110046
Seguin Outdoor Learning Center C5061 N04/09/201410005904/10/201410005303/30/201411005004/11/2014100049
Heritage Middle School C6221 N04/09/201410006203/07/201412006002/15/201411005803/25/2014130057
CPS Pecan Valley C6781 N04/09/201410006102/15/201412005903/20/201411005803/07/2014120058
Corpus Christi-Victoria
Corpus Christi West C4203/25/201413005603/20/201412005503/07/201410005302/15/2014100052
Corpus Christi Tuloso C21103/20/201411005503/25/201412005403/07/201411005204/15/2014110051
Victoria C87103/25/201412005104/15/201411005004/09/201410005003/20/2014120049
Inez C6091 N04/10/201408004904/09/201411004904/04/201410004704/08/2014090046
Aransas Pass C6591 N03/13/201411006303/07/201411006203/06/201414006203/18/2014010061
Holly Road C6601 N03/20/201412006403/25/201413006304/09/201413005903/07/2014100058
Violet C6641 N03/25/201412005903/20/201411005704/15/201411005304/09/2014100052
Ingleside C6851 N03/07/201410006102/15/201411006003/17/201421005903/13/2014100057
Odem C6861 N03/20/201412006903/07/201410006202/15/201410006003/17/2014110057
Taft C6871 N03/20/201412006303/25/201411006003/07/201410005604/09/2014100055
Lower Rio Grande Valley
Mission C43/AP143104/07/201411005404/15/201411004904/09/201409004903/29/2014110049
Brownsville C80/AGP180104/09/201409005304/08/201411005304/04/201417005104/10/2014080050
Harlingen Teege C1023104/15/201411005504/09/201409005304/04/201417005304/08/2014100052
Laredo
Laredo Vidaurri C44/AFGP144/P244104/09/201410005403/25/201418005304/08/201410005204/07/2014110051
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

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.