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Four Highest Eight-Hour Ozone Concentrations in 2017
as of May 27

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 2017 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 205/13/201712007405/06/201711007205/14/201711006305/07/2017090062
Keller C17205/06/201712007505/13/201712006705/07/201709006605/14/2017110065
Frisco C31/C680105/06/201712007305/01/201713006805/15/201710006705/07/2017080067
Midlothian OFW C52/A137105/13/201711006705/06/201709006705/07/201710006305/25/2017100062
Denton Airport South C56/A163/X157105/07/201710007305/06/201710007105/15/201710006905/14/2017110069
Arlington Municipal Airport C61105/13/201711007105/06/201711006505/07/201711005705/25/2017100056
Dallas North No.2 C63/C679105/06/201711008005/01/201712006705/07/201709006505/25/2017100063
Rockwall Heath C69105/06/201711007205/07/201710006405/01/201712006205/14/2017120061
Grapevine Fairway C70/A301/X182105/06/201710006905/14/201711006505/07/201709006505/25/2017110063
Kaufman C71/A304/X071105/06/201710006505/07/201711006405/14/201711006205/25/2017100057
Granbury C73/C681105/13/201711006505/07/201710006405/17/201711006305/14/2017110062
Eagle Mountain Lake C75 105/13/201711006905/07/201709006905/06/201711006705/15/2017100066
Parker County C76105/07/201710006205/06/201711006105/14/201710005905/13/2017140059
Cleburne Airport C77/C682105/13/201711007305/06/201711007005/07/201711006905/14/2017110066
Dallas Hinton St. C401/C60/AH161 305/06/201711008005/01/201712006905/13/201711006804/07/2017100068
Dallas Executive Airport C402105/06/201710006405/13/201711006305/07/201711005804/07/2017110057
Greenville C1006/A198105/06/201711007005/07/201709006705/01/201711006605/25/2017110061
Pilot Point C1032105/15/201710006805/14/201711006705/06/201711006705/02/2017110067
Italy C1044/A323105/06/201709006705/07/201710006405/05/201711006304/07/2017110061
Corsicana Airport C1051105/06/201710007005/07/201710006705/05/201711006505/02/2017130065
Tyler-Longview-Marshall
Longview C19/A127/C644205/25/201712006204/08/201715006204/07/201710006202/23/2017110062
Tyler Airport Relocated C82102/23/201714006705/06/201712006304/04/201714006305/07/2017100062
Karnack C85/AFHP303105/25/201711006305/07/201710006304/07/201710006305/08/2017100062
El Paso-Juarez
El Paso UTEP C12/A125/X151205/20/201714007005/12/201710006305/23/201709006205/21/2017110062
Ascarate Park SE C37/A332/A172/X159105/20/201712006303/08/201710006204/10/201710005905/23/2017090058
Chamizal C41/AH126 105/20/201712007204/21/201710006505/21/201712006405/22/2017100063
Socorro Hueco C49/F312104/10/201711005905/20/201712005805/11/201711005803/08/2017100058
Skyline Park C72105/12/201709006104/26/201712006104/13/201710006104/05/2017110060
BRAVO Big Bend C67/C316/C656/C6913 N04/30/201713006505/11/201712006404/21/201717006305/10/2017140062
Ivanhoe C414104/04/201712005805/20/201711005704/26/201711005704/10/2017100057
Waco
Waco Mazanec C1037105/06/201710007405/07/201711006805/01/201712006605/14/2017110062
Temple Georgia C1045105/06/201710007505/07/201711007204/07/201711006905/01/2017110068
Killeen Skylark Field C1047104/07/201711007105/07/201711006905/06/201711006804/24/2017110068
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 205/14/201710007305/07/201709006704/07/201711006505/06/2017110063
West Orange C9/A141205/06/201710006205/07/201709006105/02/201711006104/08/2017110061
Port Arthur West C28/A128/A228105/06/201711006605/02/201709006605/14/201710006404/24/2017110064
Hamshire C64/C654105/02/201709006304/24/201712006304/07/201711006305/07/2017090062
SETRPC Port Arthur C6281 N01/30/201710005001/31/201709004701/24/201709004701/29/2017110045
SETRPC 40 Sabine Pass C640/C1654105/02/201709006905/07/201708006705/06/201711006704/08/2017160066
SETRPC Mauriceville 42 C642/C311/C6651 N04/07/201712006904/08/201711006604/24/201715006104/09/2017090060
SETRPC 43 Jefferson Co Airport C643105/06/201711006504/24/201710006505/14/201710006405/07/2017080063
Nederland High School C1035 105/14/201711006705/06/201711006605/07/201709006505/02/2017110064
Austin
Austin Northwest C3/A322205/06/201710007105/01/201711006805/07/201710006704/07/2017100063
Audubon C38105/07/201710006805/06/201711006704/07/201711006605/14/2017090063
Fayette County C6012 N05/07/201711006905/06/201710006905/02/201712006204/07/2017110062
Dripping Springs School C6141 N05/07/201710006705/06/201711006704/07/201711006605/01/2017110063
CAPCOG McKinney Roughs C6841 N05/07/201710005605/13/201711005405/14/201709005305/12/2017110053
CAPCOG Lake Georgetown C6901 N05/06/201711007305/07/201710007004/07/201710006905/14/2017100068
Gorzycki Middle School C16031 N05/06/201711005905/07/201709005805/01/201711005802/23/2017110058
Lockhart C16041 N05/07/201710007005/13/201710006504/07/201711006405/06/2017100063
St. Edwards University C16051 N05/06/201710006005/07/201709005905/01/201711005704/07/2017110055
CAPCOG San Marcos Staples Road C16751 N05/07/201709006704/07/201711006605/06/201710006205/01/2017100061
CAPCOG Hutto College Street C66021 N05/06/201710006805/01/201710006505/07/201710006304/07/2017100062
Houston-Galveston-Brazoria
Houston East C1/G316205/06/201710008104/07/201711007005/14/201710006705/07/2017080067
Houston Aldine C8/AF108/X150 205/14/201710007605/06/201711007605/07/201709007105/02/2017100069
Channelview C15/AH115 305/06/201712007804/07/201711006804/24/201711006505/07/2017080064
Northwest Harris Co. C26/A110/X154205/14/201711007405/07/201711007105/02/201711007005/06/2017100065
Hou.DeerPrk2 C35/235/1001/AFH139FP239105/06/201710008104/07/201710006605/07/201708006404/24/2017100062
Seabrook Friendship Park C45105/06/201711007305/07/201709006705/02/201709006604/24/2017100066
Houston Bayland Park C53/A146 105/06/201711007405/07/201708006304/07/201710006205/02/2017100061
Conroe Relocated C78/A321104/07/201711008104/24/201712008005/15/201710007905/07/2017100077
Manvel Croix Park C84105/06/201711008005/23/201711007705/13/201711007005/12/2017100068
Clinton C403/C304/AH113 305/06/201711007805/07/201709006705/14/201710006305/02/2017100063
Houston North Wayside C405105/06/201711007605/14/201710007105/07/201709006605/02/2017100064
Houston Monroe C406105/06/201710007005/12/201710005605/07/201708005505/02/2017100054
Lang C408205/06/201711007005/14/201710006705/07/201709006704/07/2017100063
Houston Croquet C409205/06/201711007405/23/201711006205/07/201708006205/13/2017110061
Houston Westhollow C410105/06/201711007105/07/201709006305/02/201710006004/24/2017100060
Park Place C416105/06/201710007305/07/201709006105/02/201709005904/07/2017100059
Sheldon C5511 N05/06/201710005104/07/201710004704/24/201710004605/07/2017080044
Baytown Wetlands Center C5521 N05/06/201710006704/24/201710005805/07/201709005305/02/2017090050
Crosby Library C5531 N05/06/201711008404/24/201710008305/07/201709006505/02/2017100065
West Houston C5541 N05/06/201710006905/07/201710006705/02/201710006404/24/2017110064
La Porte Sylvan Beach C5561 N01/03/201709003503/03/201713003103/31/201713003002/26/2017110028
Mercer Arboretum C5571 N05/14/201711005205/07/201710005205/02/201710005005/06/2017100049
Tom Bass C5581 N05/06/201711006705/23/201711006105/12/201711005605/07/2017080056
Katy Park C5591 N05/06/201711006205/07/201711005705/02/201710005204/07/2017100051
Atascocita C5601 N03/22/201710004603/03/201711004503/26/201709004303/23/2017090043
Meyer Park C5611 N05/14/201711005905/07/201709005205/02/201710005205/25/2017110050
Bunker Hill Village C5621 N01/03/201710003401/08/201710003301/07/201709003101/02/2017090031
Huffman Wolf Road C5631 N02/22/201712006203/03/201712006102/26/201711005702/24/2017100056
Clear Brook High School C5701 N05/06/201711007405/07/201709006205/23/201711006105/12/2017100061
Clear Creek High School C5711 N05/06/201711006605/12/201710006505/07/201708006005/05/2017110060
HRM-3 Haden Road C603/A114 1 N05/06/201710008104/07/201710007104/24/201710006705/02/2017090066
Wallisville Road C617 1 N05/06/201710008204/07/201710007504/24/201710007405/07/2017080065
Danciger C618 1 N05/06/201709006705/13/201712006105/12/201710006005/07/2017080059
Texas City 34th St. C620 1 N05/06/201711007305/12/201710007204/07/201709006905/02/2017090068
UH Moody Tower C6951 N05/06/201711008105/07/201709006805/14/201710006505/02/2017100064
U of H-Sugarland C6961 N05/06/201711007405/07/201709006705/13/201712006605/02/2017090061
UH Coastal Center C6971 N05/12/201711006805/06/201711006705/23/201711006505/07/2017080063
UH WG Jones Forest C6981 N05/07/201710008304/24/201711008004/07/201712007905/15/2017110077
UH West Liberty C6991 N04/07/201711007804/24/201711007505/06/201711006805/07/2017090064
Lynchburg Ferry C1015/A165 102/22/201712004603/03/201715004402/26/201711004202/23/2017080042
Lake Jackson C1016 105/06/201710006805/13/201711006705/07/201708006505/23/2017120063
Baytown Garth C1017105/06/201710008404/07/201711007804/24/201710007505/07/2017080068
Galveston 99th St. C1034/A320/X183105/12/201711007605/06/201713007405/07/201703007304/07/2017100072
Oyster Creek C1607 1 N05/23/201712006705/06/201709006705/07/201707006505/13/2017110064
San Antonio
San Antonio Northwest C23205/07/201710007405/06/201710006705/13/201711006504/07/2017100063
Camp Bullis C58 105/07/201711007205/14/201710006905/06/201711006804/07/2017090066
Calaveras Lake C59105/07/201710006705/13/201711006405/14/201709006205/06/2017100061
Elm Creek Elementary C5011 N05/13/201712007705/07/201710006904/26/201711006605/14/2017100064
Fair Oaks Ranch C5021 N05/07/201710007005/14/201711006705/06/201711006504/07/2017100065
Bulverde Elementary C5031 N05/07/201711006705/06/201710006704/07/201710006405/14/2017090063
New Braunfels Airport C5041 N04/07/201710006705/07/201710006604/24/201711006205/06/2017100060
City of Garden Ridge C5051 N05/07/201711006905/06/201710006605/14/201710006204/07/2017100062
Seguin Outdoor Learning Center C5061 N05/07/201710006802/23/201711006205/14/201710006104/07/2017100061
Heritage Middle School C6221 N05/07/201710007005/13/201711006705/06/201710006505/14/2017100064
CPS Pecan Valley C6781 N05/13/201711005605/07/201711005405/24/201711005205/25/2017090051
Corpus Christi-Victoria
Corpus Christi West C4202/22/201710006402/25/201715006105/13/201711006005/12/2017120060
Corpus Christi Tuloso C21105/06/201711006305/13/201711006105/12/201711006102/22/2017110060
Victoria C87105/12/201711006505/06/201710006305/13/201710006205/07/2017080062
Inez C6091 N05/12/201711006305/06/201710006305/07/201708006105/13/2017110060
Holly Road C6601 N02/22/201711006805/24/201712006702/25/201713006604/24/2017110063
Violet C6641 N05/13/201710006305/12/201711005705/06/201710005602/22/2017100056
Ingleside C6851 N05/06/201716006505/07/201701006105/13/201712006005/05/2017150058
Lower Rio Grande Valley
Mission C43/AP143105/13/201711005805/01/201711005705/24/201711005405/14/2017080053
Brownsville C80/AGP180105/06/201710006005/01/201711006005/04/201712005805/14/2017080056
Harlingen Teege C1023105/06/201709006605/01/201710006505/14/201708005905/13/2017120058
Laredo
Laredo Vidaurri C44/AFGP144/P244105/24/201711005305/13/201709005305/05/201710005303/29/2017110053
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, 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.