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Four Highest Eight-Hour Ozone Concentrations in 2015
as of August 28

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 208/13/201510008508/03/201510008308/27/201510008008/26/2015110079
Keller C17208/03/201510008108/27/201511008006/05/201510007605/01/2015110076
Frisco C31/C680108/03/201510008208/27/201511007805/02/201510007708/17/2015100075
Midlothian OFW C52/A137108/11/201510008108/12/201510007408/13/201511007108/27/2015100065
Denton Airport South C56/A163/X157106/05/201511009208/17/201511008908/03/201511008808/27/2015110084
Arlington Municipal Airport C61107/30/201512007608/13/201511007508/11/201510007206/01/2015120069
Dallas North No.2 C63/C679108/03/201509008308/24/201510007904/30/201511007908/10/2015130078
Rockwall Heath C69104/30/201511008208/10/201511007708/03/201509007105/02/2015110071
Grapevine Fairway C70/A301/X182108/03/201510009408/17/201511008108/27/201511007908/24/2015120079
Kaufman C71/A304/X071108/04/201512006605/01/201510006508/27/201510006304/30/2015110063
Granbury C73/C681108/13/201513008607/31/201511007608/03/201510007305/01/2015100073
Eagle Mountain Lake C75 108/27/201511008108/26/201512008108/03/201511007806/05/2015100078
Parker County C76107/31/201509008005/01/201510007908/13/201514007708/27/2015110076
Cleburne Airport C77/C682108/13/201512008808/12/201510007308/11/201513006908/27/2015100068
Dallas Hinton St. C401/C60/AH161 307/30/201511008408/10/201512008208/03/201510008108/24/2015110079
Dallas Executive Airport C402107/30/201511007308/11/201510006808/10/201512006808/27/2015110067
Greenville C1006/A198108/04/201511006206/29/201511006205/02/201511006208/27/2015100061
Pilot Point C1032108/17/201510007906/06/201511007908/27/201510007808/04/2015110078
Italy C1044/A323108/11/201511007305/01/201510006506/04/201510006405/02/2015100064
Corsicana Airport C1051108/27/201510006705/01/201510006408/17/201512006305/02/2015100063
Tyler-Longview-Marshall
Longview C19/A127/C644206/06/201511008305/01/201509007008/03/201509006808/27/2015100067
Tyler Airport Relocated C82101/28/201514006804/30/201511006608/02/201513006508/01/2015090064
Karnack C85/AFHP303108/04/201510006405/04/201509006405/02/201510006208/03/2015090058
El Paso-Juarez
El Paso UTEP C12/A125/X151206/17/201510008106/21/201511007708/10/201510007406/29/2015100072
Ascarate Park SE C37/A332/A172/X159106/17/201509006606/18/201509006508/10/201510006406/21/2015100064
Chamizal C41/AH126 106/21/201510007208/10/201510007008/02/201510007006/20/2015100067
Socorro Hueco C49/F312108/09/201511007506/18/201509006906/14/201512006908/03/2015090068
Skyline Park C72107/01/201512007608/02/201511007008/17/201510006908/10/2015110069
BRAVO Big Bend C67/C316/C656/C6913 N05/25/201516006605/10/201508006605/09/201507006304/18/2015180063
Ivanhoe C414108/09/201511006708/06/201510006707/01/201510006506/18/2015090065
Waco
Waco Mazanec C1037108/12/201511007105/01/201510006808/27/201511006708/03/2015100067
Temple Georgia C1045108/27/201510007505/02/201510007205/01/201511007208/12/2015120069
Killeen Skylark Field C1047105/02/201510007002/10/201513006705/01/201511006608/27/2015110064
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 206/03/201509007108/03/201509006906/07/201509006705/02/2015100066
West Orange C9/A141208/03/201511006608/02/201510006605/02/201511006606/07/2015110062
Port Arthur West C28/A128/A228108/03/201509008208/02/201509007606/06/201511007508/12/2015100072
Hamshire C64/C654108/02/201509007508/03/201510007106/06/201512006805/02/2015110068
SETRPC Port Arthur C6281 N08/12/201510008008/13/201510007608/03/201509007406/07/2015090070
SETRPC 40 Sabine Pass C640/C1654108/12/201510009108/27/201509006408/11/201509006406/07/2015090064
SETRPC Mauriceville 42 C642/C311/C6651 N06/07/201510006508/03/201511006405/04/201509006305/02/2015110061
SETRPC 43 Jefferson Co Airport C643108/03/201509007208/02/201510007006/06/201511006508/12/2015120064
Nederland High School C1035 108/03/201509007708/02/201510007706/07/201510007206/03/2015090071
Austin
Austin Northwest C3/A322208/27/201511008208/13/201509007308/03/201509007305/01/2015110073
Audubon C38108/27/201511008105/02/201509007308/03/201509007105/01/2015110071
Fayette County C6012 N04/30/201510007205/01/201510007005/02/201511006508/13/2015110062
Dripping Springs School C6141 N08/03/201509007208/13/201510007108/27/201511007005/02/2015090070
CAPCOG McKinney Roughs C6841 N08/13/201510006905/01/201510006904/30/201510006905/02/2015090067
CAPCOG Lake Georgetown C6901 N08/27/201510007905/01/201511007505/02/201509007306/02/2015110066
Gorzycki Middle School C16031 N08/27/201511007208/13/201510007205/02/201509007205/01/2015110072
Lockhart C16041 N05/01/201510006904/30/201510006808/13/201511006705/02/2015100065
CAPCOG San Marcos Staples Road C16751 N08/13/201511007604/30/201510007005/01/201510006905/02/2015100067
CAPCOG Hutto College Street C66021 N04/30/201511007205/01/201510007105/02/201509006908/27/2015100068
Houston-Galveston-Brazoria
Houston East C1/G316206/03/2015100010208/03/2015100010108/13/201510008806/06/2015110084
Houston Aldine C8/AF108/X150 206/03/2015100010808/12/2015120010208/13/201510009508/03/2015120089
Channelview C15/AH115 306/03/201510009308/03/201510008604/30/201510008208/13/2015100081
Northwest Harris Co. C26/A110/X154206/04/201510009108/03/201511008206/03/201511007805/04/2015100072
Hou.DeerPrk2 C35/235/1001/AFH139FP239108/12/201512008806/03/201510008108/13/201510007705/01/2015110077
Seabrook Friendship Park C45106/02/201508009208/03/201509008708/12/201511008506/03/2015090083
Houston Bayland Park C53/A146 108/12/201511009808/13/201510008006/06/201510007905/01/2015110079
Conroe Relocated C78/A321105/02/201511008006/07/201511007308/13/201510007006/10/2015120070
Manvel Croix Park C84108/12/201511008908/02/201510008708/27/201510008606/01/2015110085
Clinton C403/C304/AH113 308/12/201512009208/03/201509009106/06/201511008408/13/2015100083
Houston North Wayside C405108/03/201510009006/03/201510008808/13/201510007808/12/2015120078
Houston Monroe C406108/12/201512008906/06/201510007708/27/201509007308/02/2015100073
Lang C408208/03/201510009508/13/201511009408/12/201512009106/06/2015100091
Houston Croquet C409208/12/201511009206/02/201510007905/01/201511007808/26/2015110076
Houston Westhollow C410108/12/201512008408/13/201511007906/06/201510007408/26/2015110073
Houston Texas Avenue C411108/12/201512009408/13/201510008606/06/201511008508/10/2015110079
Park Place C416108/12/2015120010008/13/201510008706/06/201511008708/10/2015100085
Sheldon C5511 N06/03/201510008208/03/201510007908/13/201510006904/30/2015100068
Baytown Wetlands Center C5521 N06/03/201510007408/03/201509006006/02/201509006007/29/2015100059
Crosby Library C5531 N04/30/201511007106/03/201511007005/02/201511007006/07/2015100065
West Houston C5541 N08/13/201511007906/06/201511007806/04/201510007408/12/2015120072
La Porte Sylvan Beach C5561 N06/03/201511009806/02/201509009008/12/201512008908/10/2015110086
Mercer Arboretum C5571 N06/03/201511007906/07/201511007506/04/201511007105/02/2015100070
Tom Bass C5581 N08/12/201512008106/06/201510007108/02/201511006906/02/2015100069
Katy Park C5591 N06/04/201510006306/03/201510006308/13/201511006205/04/2015100060
Atascocita C5601 N06/03/201511007006/07/201510006606/04/201510006608/13/2015100065
Meyer Park C5611 N06/03/201511008106/04/201511007908/03/201511007506/06/2015110065
Bunker Hill Village C5621 N08/12/201511008008/13/201510007506/06/201510007406/04/2015100065
Huffman Wolf Road C5631 N08/17/201511006905/02/201511006804/30/201511006606/10/2015100063
Clear Brook High School C5701 N06/06/201511008406/02/201511008206/01/201511007905/01/2015110077
Clear Creek High School C5711 N06/02/201509009605/01/201511007906/03/201511007706/06/2015100075
Clear Lake High School C5721 N06/02/201509008306/03/201511007506/06/201509007405/01/2015110073
HRM-3 Haden Road C603/A114 1 N06/03/2015100010708/03/201510009908/12/201512009608/13/2015100095
Wallisville Road C617 1 N06/03/201510007808/03/201510007504/30/201510007205/02/2015100063
Danciger C618 1 N08/15/201510007106/04/201509006906/03/201509006805/01/2015100067
Mustang Bayou C619 1 N08/22/201503009208/12/201511008406/01/201512007008/02/2015090069
Texas City 34th St. C620 1 N06/02/201510009508/12/201511009308/11/201511008506/06/2015100079
UH Moody Tower C6951 N08/12/2015130010606/06/201511009508/13/201511009308/10/2015110087
U of H-Sugarland C6961 N08/26/201511007908/27/201510007508/14/201511007408/12/2015120073
UH Coastal Center C6971 N08/12/201510007908/11/201511006806/06/201510006806/02/2015090065
UH WG Jones Forest C6981 N06/07/201512008305/02/201511008106/03/201510007506/24/2015130073
UH West Liberty C6991 N05/02/201511007306/08/201511007206/10/201510007104/30/2015110070
Lynchburg Ferry C1015/A165 106/03/201510008708/03/201510008108/13/201510007904/30/2015100079
Lake Jackson C1016 108/02/201511006706/03/201509006505/01/201510006508/27/2015100062
Baytown Garth C1017106/03/201511008908/03/201510008404/30/201510008205/02/2015100075
Galveston 99th St. C1034/A320/X183108/12/2015100010106/06/201512009206/02/201510008305/01/2015110080
San Antonio
San Antonio Northwest C23208/27/201511008308/13/201512007908/15/201512007805/02/2015100077
Camp Bullis C58108/27/201511008708/03/201510008005/01/201511007908/13/2015110075
Calaveras Lake C59108/13/201510007505/01/201511006805/02/201510006608/27/2015100065
Elm Creek Elementary C5011 N08/01/201510007008/13/201512006708/03/201510006605/02/2015100066
Fair Oaks Ranch C5021 N05/01/201511007608/27/201511007405/02/201510007408/03/2015100070
Bulverde Elementary C5031 N05/01/201512007505/02/201511007108/03/201512007004/30/2015130069
New Braunfels Airport C5041 N08/13/201511007304/30/201511006705/02/201510006505/01/2015100065
City of Garden Ridge C5051 N04/30/201511007608/13/201511007405/01/201510007305/02/2015100071
Seguin Outdoor Learning Center C5061 N08/13/201511007008/27/201510006208/03/201510006208/02/2015110062
Heritage Middle School C6221 N08/13/201511007708/15/201511006705/02/201510006705/01/2015120067
CPS Pecan Valley C6781 N08/13/201511007208/27/201510007008/15/201512006608/12/2015110065
Corpus Christi-Victoria
Corpus Christi West C4208/01/201510007205/01/201510007204/30/201511006908/26/2015140065
Corpus Christi Tuloso C21105/01/201510007408/01/201511006904/30/201511006908/27/2015100061
Victoria C87105/01/201510007208/01/201511007006/02/201512007004/30/2015100070
Inez C6091 N05/01/201510007206/03/201510007106/02/201511007004/30/2015090066
Coleto C6241 N05/01/201511006906/03/201512006606/02/201511006208/01/2015130060
Aransas Pass C6591 N05/01/201510007304/30/201512006905/03/201505006003/27/2015160060
Holly Road C6601 N05/01/201509006508/01/201511006404/30/201512006408/26/2015130059
Violet C6641 N05/01/201510006904/30/201510006804/29/201511005404/21/2015090053
Ingleside C6851 N05/01/201510006304/30/201512005808/01/201512005608/26/2015130054
Odem C6861 N05/01/201510007008/01/201511005904/30/201510005908/27/2015100055
Taft C6871 N08/27/201512005108/26/201512005003/23/201511004804/15/2015140046
Cuero C16021 N04/30/201510007308/27/201510006506/03/201512006505/01/2015100065
Lower Rio Grande Valley
Mission C43/AP143105/01/201510006204/30/201511005808/27/201510005104/20/2015150050
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/P244108/01/201513005804/30/201510005604/29/201511005504/27/2015110055
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.