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Four Highest Eight-Hour Ozone Concentrations in 2024
as of July 19

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 2024 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 206/06/202411008907/11/202411007505/29/202411007507/10/2024110072
Keller C17206/06/202411009206/14/202412007907/11/202411007805/29/2024110074
Frisco C31/C680107/11/202411008806/14/202411008107/10/202410007506/13/2024110075
Denton Airport South C56/A163/X157106/14/202412009206/06/202410008407/11/202414007906/12/2024100077
Arlington Municipal Airport C61107/10/202411008207/11/202410008006/06/202410007907/09/2024110074
Dallas North No.2 C63/C679107/11/202410008007/10/202410007606/14/202411007606/13/2024110067
Rockwall Heath C69107/10/202410006407/11/202411006106/14/202411006004/05/2024100059
Grapevine Fairway C70/A301/X182106/14/202411008207/11/202411008006/06/202410007607/10/2024100072
Kaufman C71/A304/X071107/10/202410007206/05/202410007105/14/202411007107/11/2024100068
Granbury C73/C681106/06/202409007005/29/202410007007/11/202411006807/10/2024110067
Eagle Mountain Lake C75 106/06/202411009306/27/202411008506/14/202412008206/12/2024110077
Parker County C76106/06/202410007005/29/202412006905/28/202411006107/11/2024110060
Cleburne Airport C77/C682106/05/202412007607/18/202411007207/11/202412006907/09/2024120067
Dallas Hinton St. C401/C60/AH161 306/14/202411007905/31/202411007907/11/202411007706/06/2024100077
Dallas Executive Airport C402106/06/202409008007/11/202411007805/31/202411007807/10/2024110074
Greenville C1006/A198104/05/202410006307/11/202410006104/07/202411006006/14/2024090059
Pilot Point C1032106/14/202410009507/11/202411008406/13/202411008306/07/2024100083
Italy C1044/A323107/09/202411007105/31/202412006806/05/202411006707/18/2024100065
Corsicana Airport C1051107/09/202412007805/14/202411007407/10/202410007306/05/2024110071
Tyler-Longview-Marshall
Longview C19/A127/C644206/14/202410007906/13/202411006907/11/202410006805/15/2024100067
Tyler Airport Relocated C82106/14/202412006806/13/202411006705/15/202409006706/11/2024090065
Karnack C85/AFHP303106/14/202409006305/15/202410006304/04/202411006203/29/2024100057
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159106/12/202409007406/15/202411006706/13/202410006707/10/2024100066
Chamizal C41/AH126 106/12/202409008006/15/202411007906/16/202409007307/10/2024090072
Socorro Hueco C49/F312106/12/202411007506/15/202411007306/25/202410007206/27/2024090071
Skyline Park C72106/12/202408007707/10/202410007406/15/202411007207/11/2024110071
Ivanhoe C414/F514106/12/202409006507/02/202410006406/15/202411006407/10/2024100060
Ojo De Agua C1021/FG121/FG221106/13/202410007507/10/202409007307/09/202410007307/06/2024120072
Waco
Waco Mazanec C1037107/10/202411008007/11/202411007105/15/202410006907/09/2024130068
Temple Georgia C1045107/11/202410006707/10/202408006506/06/202409006505/15/2024100062
Killeen Skylark Field C1047106/06/202411007407/11/202410007205/15/202409007107/10/2024120069
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 205/15/202410007906/07/202411006707/02/202409006105/11/2024100061
West Orange C9/A141205/15/202412007606/07/202410006405/18/202411006105/19/2024100058
Port Arthur West C28/A128/A228105/15/202412007306/12/202409006206/07/202411006006/14/2024090056
Hamshire C64/C654106/07/202411007805/15/202410007206/13/202409006704/04/2024130067
SETRPC Port Arthur C6281 N05/15/202410008206/12/202409007406/14/202409007006/13/2024090067
SETRPC 40 Sabine Pass C640/C1654106/06/202411007206/14/202410007005/15/202410006804/04/2024130066
SETRPC Mauriceville 42 C642/C311/C6651 N04/05/202410007004/04/202410006004/13/202411005905/19/2024100056
SETRPC 43 Jefferson Co Airport C643106/07/202411007705/15/202409007406/14/202409006106/13/2024090060
Nederland 17th Street C1035105/15/202410008306/07/202410007806/13/202408006105/18/2024100061
Austin
Austin North Hills Drive C3/A322207/11/202410007007/10/202411006906/07/202409006906/06/2024100065
Audubon C38106/07/202410006907/11/202410006707/10/202411006506/15/2024100062
Dripping Springs School C6141 N06/07/202411007805/15/202409007607/11/202411007405/14/2024120072
CAPCOG Lake Georgetown C6901 N06/07/202411006604/12/202412005906/06/202410005804/04/2024120055
Lockhart C16041 N05/14/202410006504/04/202411006304/12/202410006204/11/2024100058
CAPCOG Bastrop CAMS16121 N06/07/202411006305/15/202409006205/14/202410006204/04/2024110060
CAPCOG Elgin C16131 N05/08/202411007105/09/202413007005/25/202408006505/26/2024110064
CAPCOG East Austin C16191 N07/11/202411006407/10/202412006206/07/202411006106/14/2024120058
CAPCOG Round Rock Brushy Creek W C16201 N05/08/202412008707/10/202412006407/11/202411006205/09/2024080062
CAPCOG Taylor Murphy Park C16291 N07/10/202411006304/04/202411006306/07/202411006005/15/2024100059
CAPCOG Lake Kyle Park C16301 N06/07/202411006104/04/202411005905/08/202410005805/15/2024090057
CAPCOG San Marcos Staples Road C16751 N06/07/202411006004/04/202411005905/15/202410005805/14/2024100058
Houston-Galveston-Brazoria
Houston East C1/G316205/15/202409009806/07/202410008205/27/202410007907/01/2024100076
Houston Aldine C8/AF108/X150 205/15/202411009805/18/202411009104/12/202410007306/11/2024080072
Channelview C15/AH115 305/15/202410008205/18/202410007406/07/202410006505/27/2024100064
Northwest Harris Co. C26/A110/X154205/15/202411009606/07/202410007305/19/202410007204/30/2024110072
Hou.DeerPrk2 C35/235/1001/AFH139FP239105/15/202410008106/14/202412007107/18/202415007006/06/2024090070
Seabrook Friendship Park C45107/09/202411009507/18/202413007305/15/202410007005/14/2024110065
Houston Bayland Park C53/A146 106/07/2024100010006/14/202410009006/06/202409008306/13/2024100079
Conroe Relocated C78/A321105/15/202410009206/08/202410007905/18/202413007807/02/2024120075
Manvel Croix Park C84106/06/202410009106/14/202410007707/10/202410007005/31/2024140067
Clinton C403/C304/AH113 306/07/202410009105/15/202411008105/27/202411007807/01/2024100075
Houston North Wayside C405/C1033105/15/202411009405/27/202411007107/02/202409006604/12/2024110065
Houston Monroe C406105/15/202411006804/30/202410005703/23/202411005705/31/2024120055
Lang C408206/07/202409008705/15/202410008306/14/202411007905/27/2024110072
Houston Croquet C409206/14/202410008206/07/202410008206/06/202410007806/12/2024090068
Houston Westhollow C410/C3003106/07/202410009906/14/202410008306/13/202410007806/06/2024100075
Park Place C416106/14/202411008306/07/202410008305/15/202411008006/06/2024100076
Houston Harvard Street C417106/07/2024090010605/15/202408008506/13/202411008106/14/2024110079
Sheldon C5511 N05/15/202410007605/18/202410007304/04/202409005902/19/2024100059
Baytown Wetlands Center C5521 N05/15/202409006606/14/202412005905/14/202410005804/04/2024090058
Crosby Library C5531 N05/15/202408008204/04/202410006403/28/202410006304/12/2024100062
West Houston C5541 N06/07/2024090010806/14/202410008206/13/202410008105/15/2024100078
La Porte Sylvan Beach C5561 N05/15/202410007406/14/202414006705/14/202410006302/24/2024100061
Mercer Arboretum C5571 N05/18/2024110010005/15/202409009505/19/202410007404/12/2024100074
Tom Bass C5581 N06/06/202409008506/07/202409007403/23/202411007005/15/2024100069
Katy Park C5591 N06/07/2024100010206/13/202410007105/15/202410006506/06/2024080062
Atascocita C5601 N05/18/202410009405/15/202410008607/02/202410006903/28/2024100067
Meyer Park C5611 N05/15/2024100010304/30/202410007206/15/202408007006/07/2024090069
Bunker Hill Village C5621 N06/07/2024090010906/14/202410008506/13/202408008105/15/2024100075
Huffman Wolf Road C5631 N05/15/202409008305/18/202410007502/19/202410006504/05/2024090063
HRM-3 Haden Road C603/A114 1 N05/15/202410009106/07/202410007107/01/202410006804/12/2024110066
Wallisville Road C617 1 N05/15/202410007104/04/202411007005/27/202409006505/18/2024110065
Texas City 34th St. C620 1 N05/15/202410009006/14/202413008105/14/202411007904/04/2024110076
UH Moody Tower C6951 N06/07/202410009906/14/202411008105/15/202411007706/06/2024100073
UH WG Jones Forest C6981 N04/12/202412007303/28/202411006704/05/202411006404/04/2024120063
Lynchburg Ferry C1015/A165 105/15/202410008606/14/202413006806/07/202410006805/27/2024100067
Lake Jackson C1016 106/06/202410007905/15/202410006404/04/202411006403/28/2024100058
Baytown Garth C1017105/15/202410007105/27/202409006705/18/202411006604/04/2024110062
Galveston 99th St. C1034/A320/X183107/18/202413007805/15/202412007505/14/202413007404/04/2024120071
Oyster Creek C1607 1 N06/06/202410008004/04/202411006705/15/202411006406/14/2024080059
Liberty Sam Houston Library C16261 N05/15/202410007004/04/202412006804/05/202411006504/12/2024120056
San Antonio
San Antonio Northwest C23206/07/202409007905/14/202412007306/06/202411007105/29/2024120071
Camp Bullis C58 106/07/202410008306/06/202411007207/11/202410006905/29/2024110069
Calaveras Lake C59105/14/202411007506/07/202409007306/06/202412007006/14/2024120063
Elm Creek Elementary C5011 N05/26/2024130012205/28/2024060010306/07/202409008306/10/2024120077
Fair Oaks Ranch C5021 N06/07/202409008007/11/202411007606/06/202411007205/14/2024120069
Bulverde Elementary C5031 N06/07/202409006106/15/202409006005/18/202411005905/14/2024130059
New Braunfels Airport C5041 N06/07/202410007104/04/202411006506/06/202411006204/12/2024100061
AACOG City of Garden Ridge C505 1 N06/07/202409007906/06/202411006905/18/202411006905/14/2024120068
Seguin Outdoor Learning Center C5061 N06/07/202409007606/06/202411006506/14/202411006005/14/2024110060
Heritage Middle School C6221 N05/14/202411008606/07/202410007806/06/202411007405/29/2024110069
CPS Pecan Valley C6781 N05/14/202412005602/24/202411004902/25/202410004802/23/2024110047
Government Canyon C16101 N05/09/202411007905/14/202412007605/17/202411006906/07/2024090068
Corpus Christi-Victoria
Corpus Christi West C4206/07/202406005905/14/202411005905/31/202409005702/23/2024110057
Corpus Christi Tuloso C21105/14/202411006006/07/202407005904/12/202409005703/23/2024130056
Victoria C87106/06/202411006904/12/202411006405/15/202412005906/14/2024120058
Lower Rio Grande Valley
Mission C43/AP143105/14/202410005405/08/202411005406/06/202410005302/24/2024100053
Harlingen Teege C1023102/24/202411006104/12/202409005602/23/202409005605/14/2024100055
Laredo
Laredo College C441 N05/18/202410007906/10/202414006405/24/202411006405/09/2024100064
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
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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.