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Four Highest Eight-Hour Ozone Concentrations in 2015
as of January 30

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 201/20/201513004301/25/201511003901/19/201510003801/18/2015100037
Keller C17201/20/201513004801/28/201513003801/19/201511003601/18/2015100036
Frisco C31/C680101/20/201512005201/28/201514004901/21/201510003901/25/2015110038
Midlothian OFW C52/A137101/28/201512004901/19/201512004101/20/201509004001/18/2015110038
Denton Airport South C56/A163/X157101/20/201511005101/28/201513004201/18/201511004101/25/2015110040
Arlington Municipal Airport C61101/28/201512004401/19/201510003801/18/201510003701/25/2015110036
Dallas North No.2 C63/C679101/28/201514004901/20/201512004901/25/201512003701/18/2015120037
Rockwall Heath C69101/20/201512005701/28/201512005101/19/201510004201/21/2015100041
Grapevine Fairway C70/A301/X182101/20/201512005101/28/201514004401/25/201511003801/18/2015110038
Kaufman C71/A304/X071101/28/201512005101/19/201511004401/18/201512004001/17/2015110038
Granbury C73/C681101/20/201512004401/19/201510004101/28/201512004001/25/2015110037
Eagle Mountain Lake C75 101/20/201512005001/19/201510004001/18/201511003801/28/2015110037
Parker County C76101/20/201512005901/19/201513004601/28/201513004301/18/2015100043
Cleburne Airport C77/C682101/20/201510005001/28/201513004501/19/201511004301/18/2015100039
Dallas Hinton St. C401/C60/AH161 301/28/201513004901/25/201511003901/21/201510003701/18/2015110036
Dallas Executive Airport C402101/28/201513004701/19/201510003701/18/201510003601/25/2015110035
Greenville C1006/A198101/20/201511005401/28/201511005201/19/201510004301/21/2015100039
Pilot Point C1032101/20/201510004601/28/201514004301/25/201511003801/18/2015110038
Italy C1044/A323101/19/201511004201/18/201510003701/25/201511003601/27/2015100035
Corsicana Airport C1051101/28/201512005201/19/201511004801/18/201511003901/17/2015100039
Tyler-Longview-Marshall
Longview C19/A127/C644201/28/201513006101/19/201510004801/27/201511004401/17/2015100044
Tyler Airport Relocated C82101/28/201514006801/19/201511005101/17/201511004401/18/2015110042
Karnack C85/AFHP303101/28/201511005801/19/201511004901/17/201510004301/21/2015090041
El Paso-Juarez
El Paso UTEP C12/A125/X151201/03/201509004201/21/201510003901/23/201510003501/22/2015120035
Ascarate Park SE C37/A332/A172/X159101/03/201510003701/21/201509003501/24/201511003101/29/2015120030
Chamizal C41/AH126 101/03/201509004301/18/201510003501/23/201510003401/21/2015100034
Socorro Hueco C49/F312101/03/201509004201/21/201509003901/18/201509003801/22/2015130034
Skyline Park C72101/03/201511004501/21/201509004401/25/201509003801/18/2015100038
BRAVO Big Bend C67/C316/C656/C6913 N01/29/201515004801/21/201506004401/20/201518004101/18/2015100041
Ivanhoe C414101/03/201509003801/18/201510003501/21/201509003401/25/2015100032
Waco
Waco Mazanec C1037101/28/201512005001/19/201512004901/27/201512004001/18/2015110040
Temple Georgia C1045101/19/201511005001/28/201513004801/20/201511004601/27/2015100042
Killeen Skylark Field C1047101/20/201511005401/28/201511005301/19/201512005201/18/2015100045
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 201/27/201512005001/17/201511004901/28/201510004701/20/2015100047
West Orange C9/A141201/27/201510004701/20/201510004401/28/201510004301/17/2015110043
Port Arthur West C28/A128/A228101/27/201511005001/28/201510004901/21/201511004601/29/2015100045
Hamshire C64/C654101/28/201510006101/27/201511005201/17/201510005001/29/2015110048
SETRPC Port Arthur C6281 N01/28/201510005101/27/201510005101/29/201509004801/17/2015100048
SETRPC 40 Sabine Pass C640/C1654101/28/201509004601/20/201509004201/17/201510004201/29/2015060041
SETRPC Mauriceville 42 C642/C311/C6651 N01/20/201510004901/29/201511004801/28/201511004801/27/2015120047
SETRPC 43 Jefferson Co Airport C643101/27/201511004701/28/201509004601/29/201510004501/20/2015100044
Nederland High School C1035 101/27/201511005001/28/201510004901/29/201509004601/19/2015110045
Austin
Austin Northwest C3/A322201/19/201511005201/28/201511004301/20/201511004201/25/2015130039
Audubon C38101/19/201511005001/20/201513004901/28/201511004801/27/2015100045
Houston-Galveston-Brazoria
Houston East C1/G316201/28/201511004601/18/201510004401/20/201510004101/19/2015100041
Houston Aldine C8/AF108/X150 201/27/201511004701/28/201513004501/20/201510004501/19/2015100045
Channelview C15/AH115 301/28/201511004001/17/201510003901/25/201512003801/20/2015100037
Northwest Harris Co. C26/A110/X154201/19/201511004901/28/201511004801/20/201510004701/27/2015090041
Hou.DeerPrk2 C35/235/1001/AFH139FP239101/28/201511004401/20/201510004201/17/201509003901/19/2015100038
Seabrook Friendship Park C45101/28/201512004801/20/201510004401/17/201510004201/24/2015110040
Houston Bayland Park C53/A146 101/28/201510004801/19/201510004601/20/201510004301/22/2015020040
Conroe Relocated C78/A321101/28/201512005901/19/201512005201/20/201511005101/27/2015110044
Manvel Croix Park C84101/28/201510005001/20/201510004901/19/201510004701/27/2015090045
Clinton C403/C304/AH113 301/28/201513003901/18/201510003901/22/201503003301/20/2015100033
Houston North Wayside C405101/18/201510003901/28/201512003601/20/201511003601/19/2015110036
Houston Monroe C406101/20/201510004101/19/201510004101/28/201511004001/22/2015030037
Lang C408201/28/201510004501/19/201510004401/20/201510004301/17/2015100039
Houston Croquet C409201/28/201510005001/20/201509004901/19/201510004801/18/2015110042
Houston Westhollow C410101/19/201511004401/28/201510004301/20/201510004101/17/2015100040
Houston Texas Avenue C411101/18/201510004101/19/201511003901/28/201511003801/20/2015120034
Park Place C416101/28/201509004501/20/201510004501/19/201510004501/18/2015110040
Sheldon C5511 N01/28/201510003901/20/201511003901/27/201510003701/18/2015100037
Baytown Wetlands Center C5521 N01/28/201510003301/20/201511003201/22/201502002601/19/2015100026
Crosby Library C5531 N01/28/201511005301/20/201512004601/19/201510004101/27/2015100038
West Houston C5541 N01/28/201511005001/19/201510004801/20/201510004601/17/2015100042
La Porte Sylvan Beach C5561 N01/20/201511004301/28/201511003901/24/201512003901/25/2015110037
Mercer Arboretum C5571 N01/20/201511004101/19/201511004101/27/201510003701/28/2015110035
Tom Bass C5581 N01/28/201511004401/20/201511004101/19/201510004101/22/2015030036
Katy Park C5591 N01/19/201510004001/28/201510003801/20/201510003601/27/2015100035
Atascocita C5601 N01/28/201512003901/20/201511003701/27/201511003601/19/2015100036
Meyer Park C5611 N01/28/201511004701/20/201510004501/19/201510004401/27/2015100042
Bunker Hill Village C5621 N01/28/201511004401/19/201511004301/20/201510003901/17/2015100038
Huffman Wolf Road C5631 N01/28/201511005901/20/201512004701/19/201511004401/27/2015120042
HRM-3 Haden Road C603/A114 1 N01/28/201511004701/20/201510004701/18/201510004301/19/2015100041
Wallisville Road C617 1 N01/28/201510006201/20/201511005501/27/201510004801/19/2015100047
Danciger C618 1 N01/19/201510005101/27/201510004901/28/201510004701/20/2015100047
Mustang Bayou C619 1 N01/28/201511004901/22/201503004801/19/201510004501/20/2015100044
Texas City 34th St. C620 1 N01/28/201511005301/17/201510005001/20/201509004801/19/2015110045
UH Moody Tower C6951 N01/28/201510005401/19/201510004901/20/201511004801/18/2015110047
U of H-Sugarland C6961 N01/19/201511004701/28/201511004601/20/201511004501/22/2015030042
UH Coastal Center C6971 N01/28/201511004001/22/201502003901/17/201510003501/21/2015230034
UH WG Jones Forest C6981 N01/20/201511005501/28/201512005301/19/201511005201/27/2015140050
UH West Liberty C6991 N01/28/201511006501/20/201511005301/19/201510004901/27/2015120048
Lynchburg Ferry C1015/A165 101/28/201511003701/22/201502003501/21/201523003201/20/2015100032
Lake Jackson C1016 101/27/201511005001/19/201511005001/22/201503004901/28/2015100048
Baytown Garth C1017101/28/201510006101/20/201511005601/19/201511004701/17/2015100045
Galveston 99th St. C1034/A320/X183101/22/201503004901/17/201511004901/27/201513004701/21/2015110044
San Antonio
San Antonio Northwest C23201/19/201511005601/28/201510004701/18/201511004301/27/2015100041
Camp Bullis C58101/19/201510005101/28/201511004601/27/201510004201/18/2015100042
Calaveras Lake C59101/19/201511005201/20/201512005101/28/201511004301/18/2015120043
Heritage Middle School C6221 N01/19/201512005501/20/201512005301/18/201511004201/17/2015110042
CPS Pecan Valley C6781 N01/19/201511005301/28/201511004501/20/201511004401/18/2015100041
Corpus Christi-Victoria
Corpus Christi West C4201/27/201510004301/20/201510004201/19/201511004201/18/2015100041
Corpus Christi Tuloso C21101/19/201510004801/27/201510004401/18/201510004401/20/2015100043
Victoria C87101/19/201511004801/18/201510004401/28/201510004301/27/2015110042
Aransas Pass C6591 N01/27/201512004701/29/201511003801/28/201510003801/30/2015040023
Holly Road C6601 N01/27/201514004301/18/201511004201/19/201511004101/20/2015120038
Violet C6641 N01/19/201510004601/20/201511004201/18/201510004201/17/2015090039
Odem C6861 N01/19/201510004501/27/201510004301/20/201510004101/18/2015100040
Taft C6871 N01/18/201510004501/17/201509004201/16/201511004201/21/2015180038
Lower Rio Grande Valley
Mission C43/AP143101/18/201510003501/27/201510003301/20/201512003201/19/2015110029
Brownsville C80/AGP180101/18/201511003901/27/201510003801/19/201511003801/26/2015110037
Harlingen Teege C1023101/18/201511004701/27/201510004401/20/201511004301/19/2015100042
Laredo
Laredo Vidaurri C44/AFGP144/P244101/19/201510004201/20/201510004101/18/201510003801/28/2015100035
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.