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Four Highest Eight-Hour Ozone Concentrations in 2015
as of May 23

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 2015 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 205/01/201510007304/30/201510006705/02/201510006604/29/2015110059
Keller C17205/01/201511007604/30/201512007005/02/201511006505/18/2015110054
Frisco C31/C680105/02/201510007704/30/201511007405/01/201510007004/29/2015110061
Midlothian OFW C52/A137105/02/201510006405/01/201509006104/30/201510005904/29/2015110059
Denton Airport South C56/A163/X157105/01/201511007705/02/201510007404/30/201511007005/03/2015090061
Arlington Municipal Airport C61105/01/201509006205/02/201510006104/30/201511005904/29/2015110059
Dallas North No.2 C63/C679104/30/201511007905/02/201510006905/01/201511006804/29/2015110060
Rockwall Heath C69104/30/201511008205/02/201511007105/01/201510006904/29/2015110063
Grapevine Fairway C70/A301/X182105/01/201511007604/30/201511007505/02/201510006804/29/2015110058
Kaufman C71/A304/X071105/01/201510006504/30/201511006305/02/201510006204/29/2015110058
Granbury C73/C681105/01/201510007305/02/201510006804/30/201511006104/29/2015110059
Eagle Mountain Lake C75 105/01/201510007705/02/201511006404/30/201511006105/18/2015120054
Parker County C76105/01/201510007905/02/201510007004/30/201511006304/29/2015100059
Cleburne Airport C77/C682105/01/201510006505/02/201511006404/29/201511005804/30/2015100057
Dallas Hinton St. C401/C60/AH161 305/01/201511007104/30/201511007005/02/201511006604/29/2015110055
Dallas Executive Airport C402105/02/201510006105/01/201511006104/30/201511005904/29/2015110056
Greenville C1006/A198105/02/201511006204/29/201511006005/01/201510005904/30/2015100059
Pilot Point C1032105/02/201510007805/01/201510006604/30/201510006404/29/2015110062
Italy C1044/A323105/01/201510006505/02/201510006404/29/201511006404/30/2015100059
Corsicana Airport C1051105/01/201510006405/02/201510006304/30/201510006004/29/2015110060
Tyler-Longview-Marshall
Longview C19/A127/C644205/01/201509007005/04/201509006305/02/201510006104/30/2015100061
Tyler Airport Relocated C82101/28/201514006804/30/201511006605/01/201509006305/02/2015100062
Karnack C85/AFHP303105/04/201509006405/02/201510006205/03/201509005804/30/2015100058
El Paso-Juarez
El Paso UTEP C12/A125/X151205/11/201510006604/29/201510006405/20/201511006105/10/2015100061
Ascarate Park SE C37/A332/A172/X159105/11/201510006005/09/201514005704/29/201510005705/10/2015100056
Chamizal C41/AH126 105/09/201515006405/10/201510006204/29/201510006105/20/2015100060
Socorro Hueco C49/F312105/20/201510006505/11/201510006304/29/201509006105/10/2015090060
Skyline Park C72105/11/201511006504/29/201510006405/09/201515006304/17/2015160063
BRAVO Big Bend C67/C316/C656/C6913 N05/10/201508006605/09/201507006304/18/201518006304/19/2015120062
Ivanhoe C414105/20/201511006104/30/201511005804/20/201511005705/10/2015110056
Waco
Waco Mazanec C1037105/01/201510006805/02/201510006704/29/201511006004/30/2015110059
Temple Georgia C1045105/02/201510007205/01/201511007205/04/201516006404/30/2015100064
Killeen Skylark Field C1047105/02/201510007002/10/201513006705/01/201511006604/21/2015110062
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 205/02/201510006605/01/201511006605/04/201510006404/30/2015100062
West Orange C9/A141205/02/201511006604/30/201510006203/14/201511006005/01/2015110059
Port Arthur West C28/A128/A228105/01/201511006705/02/201510006203/14/201511006005/04/2015100059
Hamshire C64/C654105/02/201511006805/04/201508006504/30/201511006301/28/2015100061
SETRPC Port Arthur C6281 N05/01/201511006905/02/201510006704/30/201510006205/04/2015070061
SETRPC 40 Sabine Pass C640/C1654105/02/201509006305/01/201511006005/04/201507005804/30/2015090056
SETRPC Mauriceville 42 C642/C311/C6651 N05/04/201509006305/02/201511006105/03/201509005804/30/2015100058
SETRPC 43 Jefferson Co Airport C643104/30/201509005905/01/201511005803/14/201510005705/02/2015090055
Nederland High School C1035 105/02/201510006705/01/201511006605/04/201508006304/30/2015110062
Austin
Austin Northwest C3/A322205/01/201511007305/02/201510006904/30/201511006704/21/2015100061
Audubon C38105/02/201509007305/01/201511007102/10/201513006404/30/2015110063
Fayette County C6012 N04/30/201510007205/01/201510007005/02/201511006505/04/2015120059
Dripping Springs School C6141 N05/02/201509007005/01/201511006804/30/201511006304/21/2015110059
CAPCOG McKinney Roughs C6841 N05/01/201510006904/30/201510006905/02/201509006704/29/2015130062
CAPCOG Lake Georgetown C6901 N05/01/201511007505/02/201509007304/21/201511006404/30/2015110063
Gorzycki Middle School C16031 N05/02/201509007205/01/201511007204/30/201511006904/21/2015110069
Lockhart C16041 N05/01/201510006904/30/201510006805/02/201510006504/29/2015110063
CAPCOG San Marcos Staples Road C16751 N04/30/201510007005/01/201510006905/02/201510006704/21/2015110060
CAPCOG Hutto College Street C66021 N04/30/201511007205/01/201510007105/02/201509006904/21/2015110059
Houston-Galveston-Brazoria
Houston East C1/G316205/01/201511007804/30/201510007805/02/201510007105/04/2015080065
Houston Aldine C8/AF108/X150 204/30/201511008405/01/201510007905/02/201510007805/04/2015090072
Channelview C15/AH115 304/30/201510008205/02/201511007305/01/201511006705/04/2015080056
Northwest Harris Co. C26/A110/X154205/04/201510007205/02/201511006705/01/201510006504/30/2015100063
Hou.DeerPrk2 C35/235/1001/AFH139FP239105/01/201511007704/30/201510007305/02/201510006505/04/2015080059
Seabrook Friendship Park C45105/02/201510007304/30/201510007205/01/201512007105/04/2015040062
Houston Bayland Park C53/A146 105/01/201511007904/30/201511007105/04/201509006505/02/2015100065
Conroe Relocated C78/A321105/02/201511008004/30/201509007005/01/201509006903/24/2015120068
Manvel Croix Park C84105/01/201510007904/30/201510007405/02/201509006705/04/2015090066
Clinton C403/C304/AH113 304/15/201512006004/23/201512005404/25/201511004804/21/2015110046
Houston North Wayside C405104/30/201511006805/01/201511006505/02/201510006005/04/2015090058
Houston Monroe C406105/01/201510007004/30/201511006905/04/201508005805/02/2015100058
Lang C408205/01/201511007605/04/201509007204/30/201510007105/02/2015100069
Houston Croquet C409205/01/201511007804/30/201511007105/04/201509006405/02/2015100064
Houston Westhollow C410105/01/201511007205/04/201510006705/02/201510006604/15/2015120062
Houston Texas Avenue C411105/01/201511007204/30/201511006905/04/201509006105/02/2015110061
Park Place C416105/01/201511007704/30/201511007405/02/201510006505/04/2015080064
Sheldon C5511 N04/30/201510006805/02/201510006405/01/201511005905/04/2015080053
Baytown Wetlands Center C5521 N05/11/201513003902/14/201510003605/22/201512003503/14/2015090035
Crosby Library C5531 N04/30/201511007105/02/201511007005/04/201509006005/01/2015100059
West Houston C5541 N05/04/201510007105/01/201511006705/02/201511006504/30/2015100062
La Porte Sylvan Beach C5561 N02/14/201510005302/19/201511005203/28/201511005004/15/2015120048
Mercer Arboretum C5571 N05/02/201510007004/30/201510006005/04/201509005905/01/2015090057
Tom Bass C5581 N05/01/201511006604/30/201511006205/04/201510005605/02/2015100056
Katy Park C5591 N05/04/201510006005/02/201511006005/01/201511005805/03/2015140049
Atascocita C5601 N05/02/201511006404/30/201511006405/01/201510005605/04/2015090054
Meyer Park C5611 N05/02/201510006105/04/201510006005/01/201509005404/21/2015110052
Bunker Hill Village C5621 N05/01/201510006304/30/201511006305/04/201509005905/02/2015100059
Huffman Wolf Road C5631 N05/02/201511006804/30/201511006601/28/201511005903/24/2015100058
Clear Brook High School C5701 N04/15/201512006102/14/201510005404/29/201511005203/23/2015110052
Clear Creek High School C5711 N04/15/201511006602/14/201510006004/29/201511005903/14/2015100058
Clear Lake High School C5721 N04/15/201511006002/14/201510005504/29/201511005303/14/2015110053
HRM-3 Haden Road C603/A114 1 N04/30/201510008105/01/201511007805/02/201510007505/04/2015080066
Wallisville Road C617 1 N04/30/201510007205/02/201510006301/28/201510006205/01/2015110061
Danciger C618 1 N05/01/201510006705/02/201509006304/30/201510006005/04/2015080058
Mustang Bayou C619 1 N05/01/201510006804/30/201511006505/02/201509006405/04/2015070060
Texas City 34th St. C620 1 N05/01/201510007705/02/201509007504/30/201510007405/04/2015070069
UH Moody Tower C6951 N05/01/201511008104/30/201511007604/15/201514007205/02/2015100068
U of H-Sugarland C6961 N05/01/201511006904/30/201510006305/02/201510006205/04/2015120061
UH Coastal Center C6971 N05/01/201510006105/04/201510005604/30/201510005605/02/2015100055
UH WG Jones Forest C6981 N05/02/201511008105/01/201511007005/04/201509006604/30/2015110066
UH West Liberty C6991 N05/02/201511007304/30/201511007005/04/201509006601/28/2015110065
Lynchburg Ferry C1015/A165 104/30/201510007905/02/201510007405/01/201511007005/04/2015070059
Lake Jackson C1016 105/01/201510006505/02/201509006205/03/201517006004/30/2015110059
Baytown Garth C1017104/30/201510008205/02/201510007505/01/201511007105/04/2015080066
Galveston 99th St. C1034/A320/X183105/01/201511008004/30/201515007005/03/201517006805/02/2015090068
San Antonio
San Antonio Northwest C23205/02/201510007705/01/201511007404/30/201511006703/07/2015120060
Camp Bullis C58105/01/201511007805/02/201510007504/30/201512006703/23/2015110060
Calaveras Lake C59105/01/201511006805/02/201510006604/30/201511006304/27/2015120060
Elm Creek Elementary C5011 N05/02/201510006605/01/201511006204/30/201511006104/29/2015100056
Fair Oaks Ranch C5021 N05/01/201511007605/02/201510007404/30/201511006004/21/2015110055
Bulverde Elementary C5031 N05/01/201512007505/02/201511007104/30/201513006905/03/2015110055
New Braunfels Airport C5041 N04/30/201511006705/02/201510006505/01/201510006504/21/2015100059
City of Garden Ridge C5051 N04/30/201511007605/01/201510007305/02/201510007104/25/2015120061
Seguin Outdoor Learning Center C5061 N05/02/201510006105/01/201510006104/30/201509005904/21/2015100057
Heritage Middle School C6221 N05/02/201510006705/01/201512006704/30/201511006704/25/2015110062
CPS Pecan Valley C6781 N05/02/201510006304/30/201511006305/01/201510006203/07/2015110054
Corpus Christi-Victoria
Corpus Christi West C4205/01/201510007204/30/201511006904/29/201511005705/02/2015080055
Corpus Christi Tuloso C21105/01/201510007404/30/201511006904/29/201510005605/02/2015090054
Victoria C87105/01/201510007204/30/201510007005/02/201509006005/03/2015080056
Inez C6091 N05/01/201510007204/30/201509006605/02/201509006105/03/2015090058
Coleto C6241 N05/01/201511006904/30/201510006005/02/201509005804/21/2015100058
Aransas Pass C6591 N05/01/201510007304/30/201512006905/03/201505006003/27/2015160060
Holly Road C6601 N05/01/201509006504/30/201512006403/27/201513005105/03/2015060050
Violet C6641 N05/01/201510006904/30/201510006804/29/201511005404/21/2015090053
Ingleside C6851 N05/01/201510006304/30/201512005805/03/201507005004/21/2015080050
Odem C6861 N05/01/201510007004/30/201510005904/29/201510005405/02/2015090052
Taft C6871 N03/23/201511004804/15/201514004603/14/201510004601/18/2015100045
Cuero C16021 N04/30/201510007305/01/201510006505/02/201509006004/29/2015110055
Lower Rio Grande Valley
Mission C43/AP143105/01/201510006204/30/201511005804/20/201515005005/02/2015090049
Brownsville C80/AGP180104/30/201510006004/20/201512005405/01/201509005302/13/2015110051
Harlingen Teege C1023104/30/201510006105/01/201509005604/20/201513005405/02/2015080053
Laredo
Laredo Vidaurri C44/AFGP144/P244104/30/201510005604/29/201511005504/27/201511005505/01/2015100054
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.