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Four Highest Eight-Hour Ozone Concentrations in 2016
as of October 1

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 2016 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 206/07/201612009507/26/201610007306/29/201610006806/09/2016090066
Keller C17206/07/201612008507/26/201610007206/29/201611007206/20/2016120070
Frisco C31/C680107/01/201609007606/30/201610007608/05/201611007309/16/2016110070
Midlothian OFW C52/A137106/07/201610007006/06/201611006409/17/201611006305/05/2016100060
Denton Airport South C56/A163/X157106/08/201610008309/21/201611008107/01/201610007906/30/2016110076
Arlington Municipal Airport C61106/07/201611009506/06/201611006405/20/201613006309/11/2016110061
Dallas North No.2 C63/C679106/30/201610007006/07/201610007009/17/201610006706/20/2016110066
Rockwall Heath C69109/28/201611006309/17/201610006106/30/201609006105/07/2016100061
Grapevine Fairway C70/A301/X182106/07/201611008306/20/201611007706/30/201610007609/21/2016110075
Kaufman C71/A304/X071103/05/201612005905/20/201612005806/10/201609005703/14/2016140057
Granbury C73/C681106/07/201611008006/08/201610006305/07/201609006306/29/2016100062
Eagle Mountain Lake C75 106/07/201612007206/29/201611007005/06/201611006807/26/2016110067
Parker County C76106/07/201615008807/26/201612006906/29/201612006806/09/2016090068
Cleburne Airport C77/C682106/07/201611008506/06/201611008008/31/201611007809/22/2016120068
Dallas Hinton St. C401/C60/AH161 306/07/201611008209/11/201612007306/20/201611007109/20/2016110069
Dallas Executive Airport C402106/07/201611008105/20/201612006409/11/201611006309/17/2016110062
Greenville C1006/A198106/10/201610006006/29/201611005906/09/201609005804/05/2016110058
Pilot Point C1032106/30/201611008306/08/201610007807/01/201610007506/09/2016100075
Italy C1044/A323106/06/201611006203/05/201611006209/17/201610006009/01/2016090060
Corsicana Airport C1051105/07/201609006107/22/201611006007/01/201609006005/05/2016110060
Tyler-Longview-Marshall
Longview C19/A127/C644206/30/201610007003/05/201611006806/09/201609006606/10/2016090065
Tyler Airport Relocated C82106/30/201611007109/21/201611006803/05/201612006606/29/2016110063
Karnack C85/AFHP303104/05/201610006206/10/201610005908/04/201610005806/09/2016100058
El Paso-Juarez
El Paso UTEP C12/A125/X151208/08/201610007806/23/201610007806/06/201611007207/16/2016110071
Ascarate Park SE C37/A332/A172/X159106/23/201610008008/08/201610007607/16/201610007206/02/2016120066
Chamizal C41/AH126 106/23/201610008408/08/201610008105/07/201615006706/21/2016110065
Socorro Hueco C49/F312106/25/201610006909/17/201610006806/02/201612006807/09/2016100064
Skyline Park C72106/23/201610007708/08/201610006807/16/201611006708/22/2016110066
BRAVO Big Bend C67/C316/C656/C6913 N02/18/201611005401/24/201615005202/17/201612005002/14/2016100050
Ivanhoe C414106/23/201611006807/18/201610006207/16/201610006107/09/2016090059
Waco
Waco Mazanec C1037109/22/201610006207/01/201609006006/07/201610005902/27/2016110059
Temple Georgia C1045104/28/201611006906/07/201610006804/23/201610006409/22/2016090063
Killeen Skylark Field C1047104/28/201612006906/07/201611006704/23/201611006404/05/2016110062
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 205/07/201609006204/04/201610006107/01/201608006004/23/2016110060
West Orange C9/A141204/04/201611006605/14/201610006204/05/201610006205/07/2016090058
Port Arthur West C28/A128/A228104/04/201610006505/28/201609006405/06/201610006404/05/2016100063
Hamshire C64/C654104/04/201610006909/21/201610006805/06/201610006504/07/2016110064
SETRPC Port Arthur C6281 N05/08/201602005604/04/201613005605/07/201623005503/22/2016190055
SETRPC 40 Sabine Pass C640/C1654104/04/201611007404/07/201612007305/28/201608006705/16/2016010067
SETRPC Mauriceville 42 C642/C311/C6651 N04/05/201610006405/28/201609006105/07/201609006104/04/2016100061
SETRPC 43 Jefferson Co Airport C643107/21/201610006009/21/201609005705/06/201610005606/27/2016090054
Nederland High School C1035 105/06/201611006704/04/201611006405/14/201610006305/07/2016090063
Austin
Austin Northwest C3/A322204/23/201610006703/14/201611006602/12/201612006406/29/2016100063
Audubon C38104/23/201610006902/12/201612006406/07/201611006105/06/2016100061
Fayette County C6012 N05/06/201615006004/05/201612005905/04/201610005704/08/2016110057
Dripping Springs School C6141 N06/07/201611006606/30/201610006506/29/201612006404/23/2016100063
CAPCOG McKinney Roughs C6841 N09/28/201613006204/27/201612005905/06/201610005604/23/2016100056
CAPCOG Lake Georgetown C6901 N04/23/201610006604/05/201611006104/28/201610006004/07/2016110060
Gorzycki Middle School C16031 N04/23/201610006404/04/201611006303/14/201610006305/06/2016100062
Lockhart C16041 N05/05/201610006204/27/201610006204/08/201611006004/23/2016100059
St. Edwards University C16051 N05/05/201611005603/14/201610005606/29/201610005206/06/2016100051
CAPCOG San Marcos Staples Road C16751 N05/05/201612006506/29/201611006206/06/201610006104/23/2016100060
CAPCOG Hutto College Street C66021 N04/23/201610006204/04/201610005806/08/201611005705/05/2016100057
Houston-Galveston-Brazoria
Houston East C1/G316205/06/201611007107/22/201610006706/27/201610006704/23/2016100067
Houston Aldine C8/AF108/X150 208/03/201611008907/22/201611008304/27/201611007504/23/2016110074
Channelview C15/AH115 306/27/201610006404/03/201611006409/28/201611006105/06/2016100061
Northwest Harris Co. C26/A110/X154207/21/201612007904/23/201611007807/01/201611006703/05/2016110066
Hou.DeerPrk2 C35/235/1001/AFH139FP239109/28/201612007206/06/201612006404/03/201611006204/05/2016100061
Seabrook Friendship Park C45109/28/201611006809/17/201611006404/23/201611006206/30/2016110060
Houston Bayland Park C53/A146 105/06/201610008404/15/201611008305/13/201610007804/23/2016100078
Conroe Relocated C78/A321105/07/201611008004/27/201611007504/05/201611007508/04/2016110071
Manvel Croix Park C84109/28/201610007506/30/201610006906/06/201612006904/23/2016100069
Clinton C403/C304/AH113 305/06/201610006909/19/201611006504/23/201610006404/03/2016100062
Houston North Wayside C405109/19/201611006504/23/201610006405/06/201610006204/03/2016100062
Houston Monroe C406106/06/201612006609/28/201610006506/08/201609005709/03/2016100054
Lang C408204/23/201611008005/06/201611007807/21/201610007404/30/2016110069
Houston Croquet C409209/21/201610007406/08/201610007209/28/201609007106/07/2016100067
Houston Westhollow C410105/06/201610008404/23/201610007904/15/201611007906/08/2016100078
Houston Texas Avenue C411105/06/201610007509/19/201611007005/13/201610006606/08/2016100063
Park Place C416109/28/201610006705/06/201610006706/08/201610006609/21/2016100065
Sheldon C5511 N04/03/201610007204/23/201610006204/05/201610006204/04/2016100061
Baytown Wetlands Center C5521 N04/03/201610005405/07/201608005304/04/201610005304/23/2016090052
Crosby Library C5531 N04/03/201613007104/05/201611006904/04/201611006807/22/2016100067
West Houston C5541 N05/06/201611008907/21/201609008506/08/201610007103/25/2016120063
La Porte Sylvan Beach C5561 N09/28/201611006204/23/201611005909/17/201610005805/07/2016090058
Mercer Arboretum C5571 N07/22/201611007907/21/201611005807/16/201611005803/26/2016100053
Tom Bass C5581 N09/28/201610006206/08/201609005906/06/201612005904/23/2016100057
Katy Park C5591 N05/06/201612007904/23/201612006806/08/201611006604/15/2016120064
Atascocita C5601 N07/22/201611006504/03/201611006508/03/201611006404/27/2016110064
Meyer Park C5611 N04/23/201611006607/22/201611006007/21/201611006004/05/2016110058
Bunker Hill Village C5621 N05/06/201611008604/23/201611007106/08/201610006804/15/2016110067
Huffman Wolf Road C5631 N04/05/201611006804/03/201611006805/28/201609006504/04/2016110065
Clear Brook High School C5701 N06/06/201611006305/05/201609006104/23/201612006104/05/2016100061
Clear Creek High School C5711 N05/05/201610006805/04/201611006704/22/201610006604/23/2016100063
Clear Lake High School C5721 N04/23/201612006304/05/201610006304/03/201611006304/22/2016100062
HRM-3 Haden Road C603/A114 1 N09/19/201609008405/06/201610007004/03/201610006904/23/2016100067
Wallisville Road C617 1 N04/04/201610006804/03/201611006704/05/201610006506/27/2016110063
Danciger C618 1 N09/01/201609006406/30/201610006306/08/201611006304/08/2016100063
Texas City 34th St. C620 1 N09/28/201611008106/08/201612006709/03/201611006606/07/2016110066
UH Moody Tower C6951 N05/06/201610007409/28/201610007004/23/201610006905/13/2016090068
U of H-Sugarland C6961 N09/03/201610007809/21/201610007706/30/201610006904/23/2016110068
UH Coastal Center C6971 N09/28/201611007809/29/201609006805/05/201610006504/23/2016120064
UH WG Jones Forest C6981 N05/07/201610008107/22/201612007804/27/201612007708/04/2016110076
UH West Liberty C6991 N04/05/201611006305/28/201609006104/03/201611006104/04/2016110060
Lynchburg Ferry C1015/A165 104/03/201612006204/23/201610006005/07/201609005904/04/2016090058
Lake Jackson C1016 109/29/201610007304/23/201611007005/20/201611006609/01/2016090065
Baytown Garth C1017104/04/201610006704/03/201611006604/05/201611006507/22/2016100062
Galveston 99th St. C1034/A320/X183104/23/201610008405/04/201612008206/08/201612007504/07/2016110074
San Antonio
San Antonio Northwest C23205/05/201611007305/06/201610007104/23/201611006904/08/2016120066
Camp Bullis C58 105/06/201610006904/23/201610006704/08/201611006404/05/2016110063
Calaveras Lake C59109/28/201612007105/06/201611006709/29/201611006204/22/2016110062
Elm Creek Elementary C5011 N06/30/201610006605/06/201611006404/22/201611006105/05/2016100060
Fair Oaks Ranch C5021 N05/06/201610006604/23/201611006204/08/201613006104/05/2016110058
Bulverde Elementary C5031 N05/06/201611006704/23/201610006609/21/201611005509/03/2016100054
New Braunfels Airport C5041 N04/23/201610006105/06/201609006004/22/201610005805/05/2016110057
City of Garden Ridge C5051 N05/05/201611006504/23/201610006505/06/201610006404/08/2016130064
Seguin Outdoor Learning Center C5061 N05/06/201610006106/06/201611006004/23/201610006004/27/2016110057
Heritage Middle School C6221 N09/28/201612006604/08/201612006102/16/201612006105/06/2016100058
CPS Pecan Valley C6781 N05/06/201611006209/28/201611006004/27/201611005905/05/2016100058
Corpus Christi-Victoria
Corpus Christi West C4204/08/201615006604/23/201609006505/06/201610006409/02/2016110062
Corpus Christi Tuloso C21105/06/201610006604/23/201610006604/08/201615006305/04/2016100061
Victoria C87104/23/201610006605/06/201610006509/29/201610006405/04/2016110062
Inez C6091 N09/29/201610005705/07/201610005309/21/201609005105/06/2016110050
Holly Road C6601 N09/29/201611007309/02/201611007209/21/201612006504/08/2016170065
Violet C6641 N09/02/201610006909/29/201610006509/03/201610006406/07/2016090060
Ingleside C6851 N09/02/201611005509/29/201611005109/21/201610005109/03/2016100047
Odem C6861 N04/08/201613006005/06/201610005704/23/201609005404/09/2016090054
Taft C6871 N04/08/201613006104/23/201610006005/06/201610005805/04/2016110055
Lower Rio Grande Valley
Mission C43/AP143105/05/201611006104/19/201611005305/06/201610005205/04/2016110052
Brownsville C80/AGP180105/05/201611006105/06/201609005505/04/201610005304/04/2016090052
Harlingen Teege C1023105/05/201611006003/13/201611006005/06/201609005804/04/2016090055
Laredo
Laredo Vidaurri C44/AFGP144/P244105/04/201611005304/30/201611005306/06/201611005205/05/2016090050
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 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 Not Defined
401 - 500 Not Defined 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.