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Four Highest Eight-Hour Ozone Concentrations in 2024
as of October 4

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 208/20/2024110010408/08/202411009106/06/202411008909/10/2024120085
Keller C17208/08/2024120010808/20/202411009406/06/202411009208/06/2024130088
Frisco C31/C680108/07/202410009007/11/202411008808/08/202410008608/06/2024110084
Denton Airport South C56/A163/X157108/07/202412009706/14/202412009208/08/202411008808/05/2024120084
Arlington Municipal Airport C61108/08/202410008608/06/202411008407/10/202411008207/11/2024100080
Dallas North No.2 C63/C679108/08/202411008708/06/202412008608/19/202410008207/11/2024100080
Rockwall Heath C69108/08/202410007808/19/202411007208/06/202411006809/30/2024110065
Grapevine Fairway C70/A301/X182108/08/202410009908/07/202410008806/14/202411008208/06/2024130081
Kaufman C71/A304/X071109/30/202411007708/08/202410007207/10/202410007208/06/2024110071
Granbury C73/C681110/04/202410008308/09/202411008309/10/202411007707/24/2024120076
Eagle Mountain Lake C75 108/08/2024130010708/20/202412009606/06/202411009308/21/2024110089
Parker County C76109/10/202412008708/20/202413007708/21/202412007408/08/2024120071
Cleburne Airport C77/C682110/04/202410007807/19/202411007708/20/202412007607/24/2024110076
Dallas Hinton St. C401/C60/AH161 308/08/202411009908/06/202412009509/30/202412007810/02/2024120077
Dallas Executive Airport C402108/08/202411009208/06/202412008808/20/202411008606/06/2024090080
Greenville C1006/A198108/19/202411008008/07/202410007609/13/202410006808/08/2024100068
Pilot Point C1032108/07/2024110010006/14/202410009507/11/202411008406/13/2024110083
Italy C1044/A323107/09/202411007105/31/202412006806/05/202411006707/18/2024100065
Corsicana Airport C1051107/09/202412007805/14/202411007407/10/202410007308/08/2024110071
Tyler-Longview-Marshall
Longview C19/A127/C644206/14/202410007908/07/202410007508/22/202408006906/13/2024110069
Tyler Airport Relocated C82108/21/202412007206/14/202412006808/07/202410006706/13/2024110067
Karnack C85/AFHP303106/14/202409006305/15/202410006304/04/202411006208/07/2024090058
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159107/24/202411008407/25/202410007506/12/202409007408/14/2024110070
Chamizal C41/AH126 107/24/202411008106/12/202409008006/15/202411007906/16/2024090073
Socorro Hueco C49/F312107/24/202410008207/25/202411007908/01/202410007707/27/2024100077
Skyline Park C72107/24/202410008507/25/202410008307/26/202411008206/12/2024080077
Ivanhoe C414/F514107/24/202411007507/25/202411006808/14/202412006508/01/2024100065
Ojo De Agua C1021/FG121/FG221107/24/202411008407/25/202410008207/23/202420007506/13/2024100075
Waco
Waco Mazanec C1037107/10/202411008008/07/202411007707/11/202411007108/21/2024120070
Temple Georgia C1045107/11/202410006707/10/202408006506/06/202409006508/06/2024100062
Killeen Skylark Field C1047106/06/202411007407/11/202410007205/15/202409007108/22/2024110070
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 208/21/202410007905/15/202410007908/22/202410007709/30/2024100067
West Orange C9/A141205/15/202412007608/21/202410007208/22/202410006706/07/2024100064
Port Arthur West C28/A128/A228105/15/202412007308/20/202413006306/12/202409006206/07/2024110060
Hamshire C64/C654106/07/202411007805/15/202410007208/22/202410006806/13/2024090067
SETRPC Port Arthur C6281 N05/15/202410008206/12/202409007408/20/202412007306/14/2024090070
SETRPC 40 Sabine Pass C640/C1654108/20/202412007406/06/202411007209/29/202410007008/06/2024110070
SETRPC Mauriceville 42 C642/C311/C6651 N04/05/202410007008/21/202411006604/04/202410006008/07/2024100059
SETRPC 43 Jefferson Co Airport C643106/07/202411007705/15/202409007408/20/202411006909/30/2024100064
Nederland 17th Street C1035105/15/202410008308/22/202409007906/07/202410007808/21/2024100071
Austin
Austin North Hills Drive C3/A322208/06/202411007708/08/202411007007/11/202410007008/21/2024110069
Audubon C38106/07/202410006908/08/202411006808/06/202411006807/11/2024100067
Dripping Springs School C6141 N06/07/202411007805/15/202409007608/06/202413007407/11/2024110074
CAPCOG Lake Georgetown C6901 N06/07/202411006604/12/202412005906/06/202410005804/04/2024120055
Lockhart C16041 N09/28/202411006605/14/202410006509/27/202410006304/04/2024110063
CAPCOG Bastrop CAMS16121 N06/07/202411006305/15/202409006205/14/202410006204/04/2024110060
CAPCOG Elgin C16131 N05/08/202411007108/08/202413007005/09/202413007008/06/2024110069
CAPCOG East Austin C16191 N08/06/202412006709/30/202412006507/11/202411006410/01/2024120063
CAPCOG Round Rock Brushy Creek W C16201 N08/28/202406007008/06/202412006607/10/202412006408/21/2024110063
CAPCOG Taylor Murphy Park C16291 N08/07/202412006708/06/202411006708/08/202411006407/10/2024110063
CAPCOG Lake Kyle Park C16301 N08/06/202412006706/07/202411006108/08/202413005904/04/2024110059
CAPCOG San Marcos Staples Road C16751 N08/06/202412006408/08/202413006007/19/202412006006/07/2024110060
Houston-Galveston-Brazoria
Houston East C1/G316208/08/202411009805/15/202409009808/22/202409008808/06/2024080084
Houston Aldine C8/AF108/X150 208/21/2024100010508/22/202410009905/15/202411009808/08/2024120097
Channelview C15/AH115 308/08/202411009605/15/202410008208/18/202409007508/17/2024100075
Northwest Harris Co. C26/A110/X154205/15/202411009608/22/202410009509/18/202411008209/30/2024100074
Hou.DeerPrk2 C35/235/1001/AFH139FP239108/06/202410009109/17/202411008708/19/202411008709/30/2024110084
Seabrook Friendship Park C45107/09/202411009509/30/202410008209/29/202410008208/06/2024100080
Houston Bayland Park C53/A146 106/07/2024100010006/14/202410009009/30/202409008906/06/2024090083
Conroe Relocated C78/A321105/15/202410009208/21/202410008208/23/202410008106/08/2024100079
Manvel Croix Park C84106/06/202410009106/14/202410007709/29/202411007507/20/2024120072
Clinton C403/C304/AH113 306/07/202410009108/22/202410008608/08/202411008509/30/2024110084
Houston North Wayside C405/C1033108/08/202411009908/22/202410009405/15/202411009408/21/2024100092
Houston Monroe C406109/30/202410007309/17/202410007205/15/202411006809/29/2024110066
Lang C408208/08/202411009406/07/202409008709/30/202411008605/15/2024100083
Houston Croquet C409206/14/202410008206/07/202410008206/06/202410007809/30/2024100076
Houston Westhollow C410/C3003106/07/202410009906/14/202410008306/13/202410007808/11/2024100077
Park Place C416109/30/202410008806/14/202411008306/07/202410008307/20/2024120082
Houston Harvard Street C417106/07/2024090010608/08/202410009908/22/202410009408/06/2024100087
Sheldon C5511 N08/21/202409008808/08/202410008605/15/202410007608/22/2024090075
Baytown Wetlands Center C5521 N09/17/202410008608/02/202409008508/20/202410007608/08/2024100076
Crosby Library C5531 N05/15/202408008208/20/202411007408/22/202409007308/07/2024100073
West Houston C5541 N06/07/2024090010808/11/202409008709/30/202410008609/20/2024110086
La Porte Sylvan Beach C5561 N08/20/202410009508/06/202409009008/19/202411008909/30/2024100084
Mercer Arboretum C5571 N05/18/2024110010008/21/202410009605/15/202409009508/08/2024100080
Tom Bass C5581 N06/06/202409008509/30/202409008206/07/202409007409/17/2024090073
Katy Park C5591 N06/07/2024100010208/11/202409007609/30/202410007106/13/2024100071
Atascocita C5601 N08/21/2024090010405/18/202410009405/15/202410008608/22/2024090084
Meyer Park C5611 N08/22/2024100010505/15/2024100010308/21/202410008908/08/2024110085
Bunker Hill Village C5621 N06/07/2024090010906/14/202410008508/08/202410008106/13/2024080081
Huffman Wolf Road C5631 N05/15/202409008305/18/202410007508/21/202408007408/07/2024110073
HRM-3 Haden Road C603/A114 1 N05/15/202410009108/08/202411009008/22/202409007508/19/2024110074
Wallisville Road C617 1 N08/08/202411008308/20/202411007508/07/202410007405/15/2024100071
Texas City 34th St. C620 1 N08/19/2024110010105/15/202410009008/03/202411008307/18/2024160081
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 108/08/202410009205/15/202410008608/06/202410008309/30/2024100078
Lake Jackson C1016 106/06/202410007910/01/202410007009/30/202410006609/29/2024100064
Baytown Garth C1017108/08/202411008708/20/202411007908/07/202411007809/30/2024120075
Galveston 99th St. C1034/A320/X183107/19/202413008909/28/202411008809/30/202410008407/18/2024130078
Oyster Creek C1607 1 N06/06/202410008009/29/202411007609/28/202412006804/04/2024110067
Liberty Sam Houston Library C16261 N05/15/202410007004/04/202412006804/05/202411006504/12/2024120056
San Antonio
San Antonio Northwest C23206/07/202409007909/30/202411007605/14/202412007306/06/2024110071
Camp Bullis C58 106/07/202410008309/30/202411007206/06/202411007207/11/2024100069
Calaveras Lake C59105/14/202411007506/07/202409007310/01/202410007108/06/2024110070
Elm Creek Elementary C5011 N10/01/202411008806/07/202409008309/30/202411008110/04/2024100080
Fair Oaks Ranch C5021 N06/07/202409008007/11/202411007606/06/202411007205/14/2024120069
Bulverde Elementary C5031 N08/11/202410006106/07/202409006108/08/202411006006/15/2024090060
New Braunfels Airport C5041 N06/07/202410007104/04/202411006508/06/202411006206/06/2024110062
AACOG City of Garden Ridge C505 1 N09/30/202411007906/07/202409007908/06/202411007406/06/2024110069
Seguin Outdoor Learning Center C5061 N06/07/202409007606/06/202411006509/30/202410006410/01/2024090063
Heritage Middle School C6221 N09/30/202412008705/14/202411008610/01/202410008409/27/2024090078
CPS Pecan Valley C6781 N08/06/202411008509/30/202411007108/11/202409006810/01/2024110067
Government Canyon C16101 N05/09/202411007909/30/202410007805/14/202412007610/03/2024100072
Corpus Christi-Victoria
Corpus Christi West C4209/29/202411006809/30/202410006509/28/202410006509/27/2024100064
Corpus Christi Tuloso C21109/30/202410007209/29/202411006709/28/202410006109/27/2024110061
Victoria C87109/29/202410007209/28/202410007209/30/202409006906/06/2024110069
Lower Rio Grande Valley
Mission C43/AP143105/27/202409005605/14/202410005405/08/202411005406/06/2024100053
Harlingen Teege C1023102/24/202411006104/12/202409005602/23/202409005609/29/2024110055
Laredo
Laredo College C441 N05/18/202410007909/27/202411007309/28/202411007109/29/2024110069
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.