Skip to content. | Skip to navigation

Personal tools

Navigation

Four Highest Eight-Hour Ozone Concentrations in 2015
as of March 6

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 202/10/201512004601/20/201513004303/05/201511004202/14/2015100042
Keller C17201/20/201513004802/10/201513004702/14/201511004303/05/2015120040
Frisco C31/C680101/20/201512005201/28/201514004902/10/201512004703/05/2015110044
Midlothian OFW C52/A137101/28/201512004902/10/201513004602/14/201511004302/11/2015100043
Denton Airport South C56/A163/X157102/10/201513005101/20/201511005102/14/201511004903/05/2015120044
Arlington Municipal Airport C61102/10/201512004601/28/201512004402/14/201510004302/19/2015120040
Dallas North No.2 C63/C679101/28/201514004901/20/201512004902/14/201511004502/10/2015110045
Rockwall Heath C69101/20/201512005701/28/201512005102/14/201513004802/11/2015120046
Grapevine Fairway C70/A301/X182101/20/201512005102/10/201512004602/14/201511004501/28/2015140044
Kaufman C71/A304/X071101/28/201512005102/14/201513004902/11/201511004501/19/2015110044
Granbury C73/C681102/10/201513005103/05/201510004502/19/201513004502/14/2015100044
Eagle Mountain Lake C75 101/20/201512005002/10/201512004702/14/201511004502/13/2015120040
Parker County C76101/20/201512005902/10/201515005702/14/201510004902/11/2015010048
Cleburne Airport C77/C682102/10/201512005201/20/201510005002/14/201511004502/11/2015110045
Dallas Hinton St. C401/C60/AH161 301/28/201513004902/08/201511004502/14/201511004402/10/2015120044
Dallas Executive Airport C402101/28/201513004702/10/201512004502/14/201511004402/08/2015120044
Greenville C1006/A198101/20/201511005401/28/201511005202/14/201511004402/11/2015120043
Pilot Point C1032102/14/201513004801/20/201510004602/10/201512004401/28/2015140043
Italy C1044/A323102/11/201512005102/10/201512004902/14/201510004603/05/2015110044
Corsicana Airport C1051101/28/201512005202/11/201512004902/14/201513004801/19/2015110048
Tyler-Longview-Marshall
Longview C19/A127/C644201/28/201513006101/19/201510004802/11/201511004702/14/2015100044
Tyler Airport Relocated C82101/28/201514006802/11/201512005302/13/201513005201/19/2015110051
Karnack C85/AFHP303101/28/201511005801/19/201511004902/14/201510004702/07/2015130046
El Paso-Juarez
El Paso UTEP C12/A125/X151202/24/201517004401/03/201509004203/04/201509004102/20/2015100041
Ascarate Park SE C37/A332/A172/X159102/24/201517003802/13/201511003801/03/201510003702/25/2015100035
Chamizal C41/AH126 101/03/201509004303/04/201510004202/24/201516004102/21/2015100041
Socorro Hueco C49/F312103/04/201510004202/24/201518004201/03/201509004202/13/2015100040
Skyline Park C72102/20/201511004703/04/201510004501/03/201511004502/21/2015010044
BRAVO Big Bend C67/C316/C656/C6913 N02/11/201513004902/25/201513004801/29/201515004802/10/2015080046
Ivanhoe C414102/24/201516004403/04/201510004302/25/201510004302/20/2015110041
Waco
Waco Mazanec C1037102/11/201512005402/10/201512005101/28/201512005001/19/2015120049
Temple Georgia C1045102/10/201513006002/11/201511005202/14/201510005001/19/2015110050
Killeen Skylark Field C1047102/10/201513006702/11/201512005701/20/201511005402/14/2015100053
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 202/14/201511005802/15/201511005202/11/201512005201/27/2015120050
West Orange C9/A141202/14/201510005402/11/201512004902/15/201511004701/27/2015100047
Port Arthur West C28/A128/A228102/14/201511005802/11/201512005001/27/201511005001/28/2015100049
Hamshire C64/C654101/28/201510006102/14/201510006002/11/201512005201/27/2015110052
SETRPC Port Arthur C6281 N02/14/201510005701/28/201510005101/27/201510005102/15/2015110048
SETRPC 40 Sabine Pass C640/C1654102/14/201510005102/11/201511005002/15/201510004701/28/2015090046
SETRPC Mauriceville 42 C642/C311/C6651 N02/11/201512005402/15/201511005302/14/201510005201/20/2015100049
SETRPC 43 Jefferson Co Airport C643102/14/201510005402/11/201512004701/27/201511004702/15/2015110046
Nederland High School C1035 102/14/201510005501/27/201511005002/15/201511004902/11/2015120049
Austin
Austin Northwest C3/A322202/10/201512005802/14/201511005201/19/201511005202/11/2015110049
Audubon C38102/10/201513006402/14/201512005402/11/201510005401/19/2015110050
Fayette County C6012 N03/05/201511004303/06/201507004203/04/201523003002/28/2015030030
Dripping Springs School C6141 N03/06/2015070036No DataNo DataNo Data
CAPCOG McKinney Roughs C6841 N02/19/201511004803/05/201511004502/18/201511004503/06/2015070042
CAPCOG Lake Georgetown C6901 N03/05/201510004103/04/201523003403/06/201501002103/02/2015010020
Gorzycki Middle School C16031 N03/05/201511004402/25/201512004402/21/201510004103/06/2015070039
Lockhart C16041 N03/05/201510004303/06/201506003403/04/201523003102/26/2015210030
CAPCOG San Marcos Staples Road C16751 N03/05/201509004502/25/201511004502/21/201510004403/06/2015070042
Houston-Galveston-Brazoria
Houston East C1/G316201/28/201511004602/19/201512004501/18/201510004401/20/2015100041
Houston Aldine C8/AF108/X150 202/14/201510005702/19/201512004701/27/201511004702/11/2015110046
Channelview C15/AH115 302/14/201510005402/19/201513004502/09/201511004202/15/2015090040
Northwest Harris Co. C26/A110/X154202/14/201510005001/19/201511004901/28/201511004801/20/2015100047
Hou.DeerPrk2 C35/235/1001/AFH139FP239102/14/201510005303/05/201522004902/19/201512004502/15/2015110045
Seabrook Friendship Park C45102/14/201510005802/19/201513005201/28/201512004802/15/2015100046
Houston Bayland Park C53/A146 102/14/201510005102/19/201513004901/28/201510004801/19/2015100046
Conroe Relocated C78/A321101/28/201512005902/11/201511005502/10/201512005401/19/2015120052
Manvel Croix Park C84102/14/201511005502/19/201512005001/28/201510005002/11/2015100049
Clinton C403/C304/AH113 302/14/201510004502/15/201511004302/19/201512004002/09/2015100039
Houston North Wayside C405101/18/201510003902/11/201511003701/28/201512003601/20/2015110036
Houston Monroe C406102/14/201510005001/20/201510004101/19/201510004102/19/2015120040
Lang C408202/14/201510005101/28/201510004501/19/201510004401/20/2015100043
Houston Croquet C409202/14/201511005301/28/201510005001/20/201509004902/19/2015120048
Houston Westhollow C410102/14/201510004902/11/201511004602/19/201513004501/19/2015110044
Houston Texas Avenue C411102/14/201510004802/15/201511004101/18/201510004102/19/2015120040
Park Place C416102/14/201510005102/19/201512004502/15/201511004501/28/2015090045
Sheldon C5511 N02/14/201510005102/19/201512004302/09/201510004101/28/2015100039
Baytown Wetlands Center C5521 N02/14/201510003601/28/201510003301/20/201511003202/19/2015110030
Crosby Library C5531 N01/28/201511005302/14/201510005101/20/201512004602/19/2015120045
West Houston C5541 N02/11/201511005102/14/201510005001/28/201511005002/19/2015130049
La Porte Sylvan Beach C5561 N02/14/201510005302/19/201511005202/11/201513004601/20/2015110043
Mercer Arboretum C5571 N02/14/201509004502/19/201513004402/10/201510004202/11/2015110041
Tom Bass C5581 N02/14/201510004602/19/201512004401/28/201511004401/20/2015110041
Katy Park C5591 N02/25/201511004902/14/201510004502/19/201513004202/11/2015120042
Atascocita C5601 N02/14/201510004402/19/201512004201/28/201512003901/20/2015110037
Meyer Park C5611 N02/14/201510004901/28/201511004701/20/201510004501/19/2015100044
Bunker Hill Village C5621 N02/14/201511004802/19/201512004401/28/201511004402/11/2015110043
Huffman Wolf Road C5631 N01/28/201511005902/14/201510004801/20/201512004702/19/2015120046
Clear Brook High School C5701 N01/20/201510004801/19/201510004701/28/201511004601/17/2015090042
Clear Creek High School C5711 N01/28/201511005201/20/201510005201/19/201510005101/17/2015100047
Clear Lake High School C5721 N01/20/201510005001/28/201511004601/19/201510004301/17/2015100043
HRM-3 Haden Road C603/A114 1 N02/14/201510006001/28/201511004701/20/201510004702/19/2015100046
Wallisville Road C617 1 N01/28/201510006201/20/201511005502/19/201512005302/11/2015120050
Danciger C618 1 N02/14/201510005301/19/201510005102/11/201510005002/15/2015110049
Mustang Bayou C619 1 N02/14/201510005202/19/201512005101/28/201511004902/15/2015110048
Texas City 34th St. C620 1 N02/14/201510005601/28/201511005302/19/201512005202/15/2015100052
UH Moody Tower C6951 N01/28/201510005401/19/201510004902/19/201512004801/20/2015110048
U of H-Sugarland C6961 N02/14/201511005002/19/201513004801/19/201511004701/28/2015110046
UH Coastal Center C6971 N02/19/201512004502/15/201512004202/14/201511004202/09/2015110040
UH WG Jones Forest C6981 N01/20/201511005502/14/201511005301/28/201512005301/19/2015110052
UH West Liberty C6991 N01/28/201511006502/14/201510005601/20/201511005302/19/2015130051
Lynchburg Ferry C1015/A165 102/14/201510004902/19/201513004702/15/201520004102/20/2015090039
Lake Jackson C1016 102/14/201510005402/15/201511005102/19/201511005002/09/2015110050
Baytown Garth C1017101/28/201510006102/14/201511006001/20/201511005602/19/2015120053
Galveston 99th St. C1034/A320/X183102/19/201512005602/09/201512005302/14/201510005202/12/2015120052
San Antonio
San Antonio Northwest C23202/10/201511005901/19/201511005602/09/201510005302/11/2015110051
Camp Bullis C58102/10/201511005902/11/201511005101/19/201510005102/14/2015100050
Calaveras Lake C59102/10/201511005702/09/201511005301/19/201511005201/20/2015120051
Heritage Middle School C6221 N02/10/201511006002/09/201512005501/19/201512005501/20/2015120053
CPS Pecan Valley C6781 N01/19/201511005302/10/201510005102/09/201511004601/28/2015110045
Corpus Christi-Victoria
Corpus Christi West C4202/26/201511004702/10/201511004702/14/201510004602/09/2015110046
Corpus Christi Tuloso C21102/10/201510005102/09/201511005102/13/201512004902/14/2015100048
Victoria C87102/14/201510005102/10/201511005102/13/201511005002/11/2015110048
Aransas Pass C6591 N02/12/201515005402/14/201511005002/10/201511005002/15/2015020048
Holly Road C6601 N02/14/201510004602/10/201511004602/12/201515004502/15/2015060043
Violet C6641 N02/26/201511004801/19/201510004601/20/201511004201/18/2015100042
Ingleside C6851 N03/05/201511003803/06/201507003602/28/201501003202/27/2015210031
Odem C6861 N02/10/201510004802/14/201510004702/13/201511004702/09/2015110047
Taft C6871 N01/18/201510004501/17/201509004201/16/201511004201/24/2015110039
Lower Rio Grande Valley
Mission C43/AP143102/26/201513003703/05/201516003501/18/201510003503/06/2015010033
Brownsville C80/AGP180102/13/201511005102/12/201514005002/14/201510004702/10/2015110046
Harlingen Teege C1023102/14/201510005202/13/201511005102/10/201511005002/26/2015110048
Laredo
Laredo Vidaurri C44/AFGP144/P244102/13/201511004702/26/201511004302/14/201509004302/09/2015100043
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.