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Four Highest Eight-Hour Ozone Concentrations in 2014
as of October 21

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 207/23/201410008807/24/201411008108/14/201410007907/22/2014110079
Keller C17208/14/201411008009/25/201411007609/26/201411007509/24/2014110074
Frisco C31/C680107/25/201410008306/11/201410007505/16/201413007508/14/2014100074
Midlothian OFW C52/A137105/16/201412006808/11/201411006307/24/201411006207/23/2014110062
Denton Airport South C56/A163/X157108/05/201411008308/14/201411008207/16/201410007807/25/2014100077
Arlington Municipal Airport C61107/23/201411007807/24/201411006910/17/201410006505/16/2014120065
Dallas North No.2 C63/C679107/25/201410007208/29/201411007105/16/201413007005/03/2014110070
Rockwall Heath C69105/16/201412007207/29/201412006707/25/201411006705/04/2014100066
Grapevine Fairway C70/A301/X182108/14/201410008208/05/201410007609/24/201411007307/25/2014100073
Kaufman C71/A304/X071105/16/201412006507/25/201412006205/05/201414006205/04/2014110062
Granbury C73/C681107/23/201413009107/24/201412008708/13/201412007404/22/2014110073
Eagle Mountain Lake C75 109/25/201411007808/14/201412007809/26/201411007609/24/2014110073
Parker County C76109/25/201412007809/26/201413007709/24/201413007310/17/2014120072
Cleburne Airport C77/C682107/23/201412007908/13/201412007607/24/201411007208/11/2014110071
Dallas Hinton St. C401/C60/AH161 310/17/201412007008/14/201410006905/16/201413006907/25/2014110066
Dallas Executive Airport C402107/23/201410007105/16/201413006505/03/201411006309/06/2014100062
Greenville C1006/A198105/16/201411006406/11/201410006307/25/201410006205/05/2014120062
Pilot Point C1032107/25/201411008808/14/201410007906/11/201411007805/16/2014120075
Italy C1044/A323105/16/201412006908/11/201410006605/28/201410006005/04/2014110060
Corsicana Airport C1051105/16/201411006805/04/201411006207/30/201411006005/15/2014110059
Tyler-Longview-Marshall
Longview C19/A127/C644205/05/201413007507/23/201410007309/08/201411006607/05/2014110066
Tyler Airport Relocated C82105/05/201415007005/16/201412006705/04/201410006604/25/2014120066
Karnack C85/AFHP303105/03/201410007105/05/201410006905/16/201411006605/04/2014100066
El Paso-Juarez
El Paso UTEP C12/A125/X151207/15/201412007506/10/201410007306/21/201410007206/02/2014110070
Ascarate Park SE C37/A332/A172/X159106/10/201410006508/17/201410006208/05/201410006207/15/2014120062
Chamizal C41/AH126 107/15/201412007106/10/201411007108/05/201410006708/17/2014090066
Socorro Hueco C49/F312108/08/201410007306/10/201411007007/30/201410006607/21/2014100066
Skyline Park C72107/18/201411007306/10/201410007108/06/201411007008/05/2014110070
BRAVO Big Bend C67/C316/C656/C6913 N05/31/201411006505/30/201412006505/28/201407006506/01/2014030064
Ivanhoe C414106/10/201411006705/17/201410006506/07/201409006306/09/2014110062
Cd Juarez Delphi C6631 N07/15/201412005808/08/201410005506/10/201410005308/05/2014100051
Waco
Waco Mazanec C1037105/16/201411007204/25/201412006405/04/201410006304/09/2014110063
Temple Georgia C1045105/16/201412007405/17/201411006705/04/201411006704/09/2014110067
Killeen Skylark Field C1047105/16/201413007405/17/201411007106/11/201410006905/05/2014110069
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 205/03/201410007707/05/201411006705/04/201409006705/05/2014080065
West Orange C9/A141205/03/201410007106/11/201409006805/04/201410006505/05/2014080063
Port Arthur West C28/A128/A228105/03/201410006505/05/201408006305/04/201410006307/23/2014090062
Hamshire C64/C654105/03/201409007305/04/201409006905/05/201408006806/11/2014090067
SETRPC Port Arthur C6281 N05/02/201411006105/30/201410005805/15/201412005805/05/2014080056
SETRPC 40 Sabine Pass C640/C1654105/02/201413008005/04/201409007005/15/201415006905/05/2014060067
SETRPC Mauriceville 42 C642/C311/C6651 N05/03/201410007905/04/201409007205/05/201408007107/06/2014090068
SETRPC 43 Jefferson Co Airport C643108/14/201409006605/03/201410006607/05/201411006205/05/2014080062
Nederland High School C1035 105/03/201410007408/14/201410007105/05/201409006805/04/2014100067
Austin
Austin Northwest C3/A322205/16/201411006905/04/201410006309/08/201410006205/17/2014110062
Audubon C38105/16/201411006808/12/201412006305/17/201412006305/04/2014100063
Fayette County C6012 N05/03/201410007305/16/201410006905/15/201411006905/04/2014120069
Dripping Springs School C6141 N05/16/201410007009/24/201411006408/14/201410006305/17/2014110063
CAPCOG McKinney Roughs C6841 N05/15/201411005805/16/201410005505/17/201410005305/04/2014080053
CAPCOG Lake Georgetown C6901 N05/16/201411007005/17/201411006605/05/201411006605/04/2014090065
Gorzycki Middle School C16031 N07/23/201412006308/12/201413005910/04/201412005808/14/2014100057
Lockhart C16041 N05/29/201409006605/03/201411006404/28/201410006405/30/2014110061
CAPCOG San Marcos Staples Road C16751 N05/03/201411006805/04/201409006207/23/201412006105/15/2014120061
CAPCOG Hutto College Street C66021 N09/08/201411003905/16/201411003708/30/201410003608/27/2014100036
Houston-Galveston-Brazoria
Houston East C1/G316207/24/201411007505/03/201411006905/04/201410006705/05/2014080066
Houston Aldine C8/AF108/X150 206/11/201410007507/24/201412007205/03/201411007007/30/2014100068
Channelview C15/AH115 305/03/201411006705/02/201411006604/28/201410006505/04/2014090064
Northwest Harris Co. C26/A110/X154208/14/201411007107/30/201411006605/05/201409006505/04/2014110063
Hou.DeerPrk2 C35/235/1001/AFH139FP239107/24/201411007005/02/201411006405/30/201410006305/15/2014120062
Seabrook Friendship Park C45105/02/201411006907/24/201411006805/15/201411006605/04/2014110065
Houston Bayland Park C53/A146 109/08/201412007408/13/201410006808/25/201411006704/25/2014110067
Conroe Relocated C78/A321105/05/201410008008/15/201411007308/06/201411007307/30/2014090072
Manvel Croix Park C84108/13/201410008208/25/201412007608/12/201411007110/20/2014100070
Clinton C403/C304/AH113 307/24/201411006504/28/201410006005/04/201410005904/25/2014110058
Houston North Wayside C405107/24/201411006806/11/201410006408/24/201411006205/04/2014090062
Houston Monroe C406104/28/201410006808/25/201411006605/29/201412006505/28/2014110065
Lang C408208/14/201410006905/04/201409006506/11/201410006405/03/2014100064
Houston Croquet C409208/25/201412007609/08/201412007408/13/201410007408/12/2014110066
Houston Westhollow C410108/14/201410007609/08/201412007204/25/201410007008/13/2014100067
Houston Texas Avenue C411108/14/201410005905/03/201411005905/04/201409005805/02/2014110058
Park Place C416107/24/201412006803/20/201411006808/13/201410006608/25/2014110063
Sheldon C5511 N05/03/201411007305/02/201410007205/05/201408007105/04/2014090071
Baytown Wetlands Center C5521 N05/02/201411006505/30/201410006305/03/201410006305/04/2014090061
Crosby Library C5531 N06/11/201409007205/03/201411006705/05/201408006505/04/2014090065
West Houston C5541 N04/25/201411007305/03/201410006604/19/201410006505/05/2014090064
La Porte Sylvan Beach C5561 N05/02/201411007207/24/201410007105/30/201409006805/03/2014100067
Mercer Arboretum C5571 N06/11/201410007007/30/201410006605/05/201409006605/04/2014100065
Tom Bass C5581 N08/13/201410006308/25/201412006205/29/201412006105/04/2014090057
Katy Park C5591 N08/14/201410008104/25/201410006809/26/201410006009/08/2014120059
Atascocita C5601 N06/11/201410007305/03/201410006405/05/201408006305/04/2014090063
Meyer Park C5611 N08/14/201410006907/30/201410006805/05/201408006505/04/2014100063
Bunker Hill Village C5621 N08/14/201410007204/25/201410006805/04/201410006705/05/2014090065
Huffman Wolf Road C5631 N06/11/201410007205/05/201408006505/04/201409006405/03/2014100064
Clear Brook High School C5701 N07/24/201411007308/12/201405006508/13/201404006307/23/2014110061
Clear Creek High School C5711 N08/12/201406006608/13/201406005508/14/201405005207/30/2014100051
Clear Lake High School C5721 N08/25/201405006808/12/201405005907/23/201411005608/13/2014050054
HRM-3 Haden Road C603/A114 1 N07/24/201411007304/28/201410006905/03/201411006805/04/2014100067
Wallisville Road C617 1 N06/11/201408007805/02/201411007605/03/201410007505/15/2014120071
Danciger C618 1 N08/13/201410007809/22/201410006908/26/201409006605/04/2014100064
Mustang Bayou C619 1 N05/29/201412008205/02/201410006505/27/201409006405/04/2014100064
Texas City 34th St. C620 1 N05/02/201411007107/24/201410007005/15/201410006505/04/2014080065
UH Moody Tower C6951 N07/24/201412007607/23/201411007204/25/201411007209/08/2014110071
U of H-Sugarland C6961 N08/13/201410007309/24/201411006609/08/201411006407/04/2014100064
UH Coastal Center C6971 N07/24/201410006905/02/201410006704/29/201412006508/12/2014110063
UH WG Jones Forest C6981 N07/30/201411008305/05/201410007707/16/201412007604/20/2014110072
UH West Liberty C6991 N05/03/201411008005/04/201410007805/05/201408007605/16/2014100074
Lynchburg Ferry C1015/A165 105/05/201408006105/02/201411006105/04/201411005905/03/2014110059
Lake Jackson C1016 105/04/201410006205/02/201410006205/03/201410006104/29/2014120061
Baytown Garth C1017106/11/201408007205/02/201411007005/03/201410006905/04/2014090067
Galveston 99th St. C1034/A320/X183108/12/201412007607/24/201410007409/08/201412007305/29/2014170071
San Antonio
San Antonio Northwest C23208/14/201410007007/23/201413007009/23/201411006909/24/2014100068
Camp Bullis C58109/30/201410007205/10/201411007209/24/201410006905/16/2014110069
Calaveras Lake C59105/30/201411008105/31/201410006805/15/201411006505/29/2014100063
Elm Creek Elementary C5011 N08/14/201411007208/13/201411007008/04/201411006905/31/2014110066
Fair Oaks Ranch C5021 N05/10/201411006909/30/201411006705/16/201410006605/05/2014100064
Bulverde Elementary C5031 N05/16/201411006704/09/201411006505/10/201411006409/24/2014100063
New Braunfels Airport C5041 N05/15/201411006405/03/201410006307/23/201412006105/16/2014100060
City of Garden Ridge C5051 N04/22/201411005905/16/201411005805/15/201411005805/03/2014110058
Seguin Outdoor Learning Center C5061 N05/15/201411006505/03/201410006505/29/201411006405/30/2014100063
Heritage Middle School C6221 N05/30/201411009105/31/201410007104/22/201411007105/15/2014110070
CPS Pecan Valley C6781 N05/30/201411007608/14/201411006908/13/201410006505/31/2014100063
Corpus Christi-Victoria
Corpus Christi West C4205/30/201411006605/29/201411006509/24/201411006309/23/2014120059
Corpus Christi Tuloso C21105/29/201411006705/30/201410006609/24/201411005904/29/2014110059
Victoria C87105/30/201411006310/20/201412006209/23/201411006105/29/2014100061
Inez C6091 N10/20/201411006005/04/201413005704/29/201411005608/27/2014090055
Coleto C6241 N05/04/201411005905/02/201412005809/24/201411005609/23/2014130054
Aransas Pass C6591 N04/29/201412007505/29/201414007004/18/201411006805/30/2014100067
Holly Road C6601 N05/29/201411007605/30/201410007104/18/201412006603/20/2014120064
Violet C6641 N05/29/201410006505/30/201410006308/05/201409006204/29/2014110062
Ingleside C6851 N05/30/201410006505/29/201418006305/15/201410006103/07/2014100061
Odem C6861 N03/20/201412006905/29/201411006705/03/201409006203/07/2014100062
Taft C6871 N05/29/201410006705/03/201410006605/30/201410006505/15/2014100065
Cuero C16021 N09/24/201415007605/29/201410007005/30/201409006905/03/2014100068
Lower Rio Grande Valley
Mission C43/AP143105/03/201411005905/02/201410005905/30/201410005705/15/2014110056
Brownsville C80/AGP180105/02/201411006104/29/201418006105/15/201411006005/04/2014080060
Harlingen Teege C1023105/03/201410006105/15/201410006005/04/201408005905/02/2014110059
Laredo
Laredo Vidaurri C44/AFGP144/P244105/16/201411005805/31/201410005705/15/201411005705/03/2014100057
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.