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Four Highest Eight-Hour Ozone Concentrations in 2015
as of April 26

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 204/19/201513005304/25/201511005104/15/201510004904/21/2015110048
Keller C17204/18/201511005404/15/201511005103/28/201512005001/20/2015130048
Frisco C31/C680103/28/201512006004/15/201512005904/18/201510005403/24/2015110053
Midlothian OFW C52/A137104/19/201514005003/28/201512005004/25/201510004901/28/2015120049
Denton Airport South C56/A163/X157104/15/201511005803/28/201511005804/19/201513005404/18/2015100053
Arlington Municipal Airport C61104/25/201511004803/28/201512004802/10/201512004604/15/2015110045
Dallas North No.2 C63/C679103/28/201512005704/15/201511005504/25/201511005204/19/2015140052
Rockwall Heath C69104/25/201511005904/15/201512005803/28/201512005701/20/2015120057
Grapevine Fairway C70/A301/X182104/18/201512005804/15/201511005403/28/201512005404/19/2015130052
Kaufman C71/A304/X071103/28/201512005501/28/201512005104/25/201511005004/19/2015130050
Granbury C73/C681104/21/201512005504/19/201513005504/25/201511005304/20/2015110051
Eagle Mountain Lake C75 104/19/201512005003/28/201510005001/20/201512005004/21/2015120048
Parker County C76101/20/201512005902/10/201515005704/19/201512005604/21/2015120055
Cleburne Airport C77/C682102/10/201512005204/21/201511005101/20/201510005004/20/2015110049
Dallas Hinton St. C401/C60/AH161 303/28/201512005404/19/201514005304/25/201511005204/18/2015120052
Dallas Executive Airport C402103/28/201512004904/25/201511004804/19/201514004801/28/2015130047
Greenville C1006/A198101/20/201511005404/25/201510005201/28/201511005203/28/2015100051
Pilot Point C1032103/28/201511005704/15/201512005404/19/201513005303/24/2015110053
Italy C1044/A323103/28/201511005502/11/201512005104/20/201511004904/19/2015120049
Corsicana Airport C1051103/28/201510005201/28/201512005202/11/201512004904/25/2015100048
Tyler-Longview-Marshall
Longview C19/A127/C644201/28/201513006104/17/201509005403/28/201512005303/07/2015100052
Tyler Airport Relocated C82101/28/201514006803/28/201513006003/23/201511005703/07/2015100055
Karnack C85/AFHP303101/28/201511005803/07/201510005303/28/201511005003/29/2015110049
El Paso-Juarez
El Paso UTEP C12/A125/X151204/20/201510006104/19/201510005704/17/201510005704/03/2015100056
Ascarate Park SE C37/A332/A172/X159104/03/201510005304/19/201510005204/17/201513004904/09/2015070049
Chamizal C41/AH126 104/20/201511005904/17/201511005904/19/201511005704/18/2015090057
Socorro Hueco C49/F312104/19/201511005804/20/201510005704/17/201510005604/18/2015090055
Skyline Park C72104/17/201516006304/20/201510006204/16/201517006204/19/2015110056
BRAVO Big Bend C67/C316/C656/C6913 N04/18/201518006304/19/201512006204/25/201501005704/22/2015130057
Ivanhoe C414104/20/201511005704/17/201511005604/16/201517005604/21/2015090055
Waco
Waco Mazanec C1037103/28/201511005604/21/201513005402/11/201512005402/10/2015120051
Temple Georgia C1045104/21/201512006103/28/201511006002/10/201513006004/25/2015100054
Killeen Skylark Field C1047102/10/201513006704/21/201511006204/25/201510005703/28/2015120057
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 203/14/201511005902/14/201511005803/28/201510005704/19/2015090055
West Orange C9/A141203/14/201511006003/28/201512005502/14/201510005404/19/2015090051
Port Arthur West C28/A128/A228103/14/201511006002/14/201511005804/15/201511005603/28/2015110055
Hamshire C64/C654101/28/201510006103/14/201511006002/14/201510006003/28/2015100058
SETRPC Port Arthur C6281 N03/14/201510005904/15/201511005703/28/201511005702/14/2015100057
SETRPC 40 Sabine Pass C640/C1654102/14/201510005102/11/201511005003/14/201511004702/15/2015100047
SETRPC Mauriceville 42 C642/C311/C6651 N03/28/201511005803/14/201511005704/19/201510005402/11/2015120054
SETRPC 43 Jefferson Co Airport C643103/14/201510005703/28/201511005502/14/201510005403/15/2015110048
Nederland High School C1035 103/14/201511006204/15/201512005903/28/201511005702/14/2015100055
Austin
Austin Northwest C3/A322204/21/201510006102/10/201512005803/28/201510005404/19/2015140053
Audubon C38102/10/201513006404/21/201511006303/28/201510005804/25/2015100054
Fayette County C6012 N04/21/201510005803/28/201510005303/07/201513005303/14/2015120052
Dripping Springs School C6141 N04/21/201511005903/28/201510005703/24/201511005604/25/2015100052
CAPCOG McKinney Roughs C6841 N04/21/201510006103/14/201512005803/28/201510005504/25/2015110054
CAPCOG Lake Georgetown C6901 N04/21/201511006403/28/201511005903/24/201511005504/25/2015100054
Gorzycki Middle School C16031 N04/21/201511006903/28/201510006504/19/201514006304/20/2015110062
Lockhart C16041 N04/21/201510006003/14/201511005503/07/201511005404/25/2015110051
CAPCOG San Marcos Staples Road C16751 N04/21/201511006003/07/201511005903/14/201511005604/20/2015110052
CAPCOG Hutto College Street C66021 N04/21/201511005904/25/201510005404/19/201513005104/20/2015100050
Houston-Galveston-Brazoria
Houston East C1/G316204/15/201512006203/28/201511005504/23/201512005404/22/2015080052
Houston Aldine C8/AF108/X150 204/15/201512006604/21/201511005804/22/201509005703/28/2015100057
Channelview C15/AH115 302/14/201510005403/28/201510005204/19/201509004704/13/2015110047
Northwest Harris Co. C26/A110/X154204/21/201510006004/15/201512005403/24/201510005204/22/2015090051
Hou.DeerPrk2 C35/235/1001/AFH139FP239104/23/201511005704/15/201512005502/14/201510005303/28/2015110049
Seabrook Friendship Park C45104/15/201513005802/14/201510005804/21/201516005503/28/2015100053
Houston Bayland Park C53/A146 104/15/201512005904/21/201511005102/14/201510005103/23/2015120050
Conroe Relocated C78/A321103/24/201512006804/22/201510006603/25/201511006401/28/2015120059
Manvel Croix Park C84104/15/201513005803/15/201512005703/23/201512005502/14/2015110055
Clinton C403/C304/AH113 304/15/201512006004/23/201512005404/25/201511004804/21/2015110046
Houston North Wayside C405104/15/201512005504/23/201512004804/22/201508004804/21/2015110045
Houston Monroe C406104/15/201513005402/14/201510005004/21/201511004703/15/2015110047
Lang C408204/15/201512006304/23/201512005704/21/201509005303/24/2015100052
Houston Croquet C409204/15/201512005703/23/201512005302/14/201511005304/21/2015100052
Houston Westhollow C410104/15/201512006204/21/201511005503/28/201510005103/23/2015110051
Houston Texas Avenue C411104/15/201512005304/23/201512005202/14/201510004804/21/2015110046
Park Place C416104/15/201513006404/23/201511005502/14/201510005104/21/2015110050
Sheldon C5511 N02/14/201510005103/28/201510004804/25/201511004504/21/2015110045
Baytown Wetlands Center C5521 N02/14/201510003603/14/201509003504/23/201510003303/28/2015100033
Crosby Library C5531 N01/28/201511005303/28/201511005202/14/201510005104/25/2015110049
West Houston C5541 N04/15/201512005604/21/201510005502/11/201511005102/14/2015100050
La Porte Sylvan Beach C5561 N02/14/201510005302/19/201511005203/28/201511005004/15/2015120048
Mercer Arboretum C5571 N04/22/201510005204/21/201511005103/24/201510005104/15/2015110050
Tom Bass C5581 N04/15/201513005303/15/201512004804/21/201511004602/14/2015100046
Katy Park C5591 N04/21/201510004804/15/201512004703/28/201510004702/14/2015100045
Atascocita C5601 N03/28/201511004603/24/201510004604/21/201511004504/15/2015110044
Meyer Park C5611 N04/21/201511005204/15/201512005002/14/201510004901/28/2015110047
Bunker Hill Village C5621 N04/15/201512005304/21/201511004802/14/201511004803/28/2015100046
Huffman Wolf Road C5631 N01/28/201511005903/24/201510005803/28/201510005703/25/2015100051
Clear Brook High School C5701 N02/14/201510005403/23/201511005203/28/201510005003/15/2015110048
Clear Creek High School C5711 N02/14/201510006003/14/201510005803/28/201510005602/15/2015110053
Clear Lake High School C5721 N02/14/201510005503/14/201511005303/28/201510005201/20/2015100050
HRM-3 Haden Road C603/A114 1 N02/14/201510006004/15/201511005803/28/201510005504/25/2015110053
Wallisville Road C617 1 N01/28/201510006203/14/201511005803/28/201510005704/13/2015110055
Danciger C618 1 N04/21/201512005503/23/201512005504/15/201511005404/20/2015100053
Mustang Bayou C619 1 N03/30/201513005904/15/201512005703/23/201512005503/28/2015100052
Texas City 34th St. C620 1 N04/21/201510005704/15/201511005703/28/201510005602/14/2015100056
UH Moody Tower C6951 N04/15/201514007202/14/201510005604/23/201512005501/28/2015100054
U of H-Sugarland C6961 N04/15/201513005202/14/201511005004/21/201511004802/19/2015130048
UH Coastal Center C6971 N04/15/201513004702/19/201512004504/16/201520004304/22/2015080042
UH WG Jones Forest C6981 N04/22/201510006603/25/201512006104/21/201511006004/15/2015130056
UH West Liberty C6991 N01/28/201511006504/13/201511006403/28/201510006404/25/2015110063
Lynchburg Ferry C1015/A165 104/23/201509005402/14/201510004904/21/201511004804/15/2015130047
Lake Jackson C1016 102/14/201510005404/21/201511005202/15/201511005104/20/2015100050
Baytown Garth C1017101/28/201510006102/14/201511006003/14/201510005704/23/2015110056
Galveston 99th St. C1034/A320/X183104/21/201515006004/19/201510005804/15/201513005703/28/2015090056
San Antonio
San Antonio Northwest C23203/07/201512006002/10/201511005904/21/201511005701/19/2015110056
Camp Bullis C58103/23/201511006003/07/201511005902/10/201511005904/21/2015110058
Calaveras Lake C59104/25/201511005903/07/201511005802/10/201511005704/21/2015100054
Elm Creek Elementary C5011 N04/21/201511005003/28/201510004704/20/201510004404/19/2015130043
Fair Oaks Ranch C5021 N04/21/201511005504/19/201512004704/25/201510004604/15/2015110046
Bulverde Elementary C5031 N04/15/201513005204/20/201512004804/19/201514004704/13/2015120040
New Braunfels Airport C5041 N04/21/201510005904/25/201511005004/19/201511005004/20/2015100048
City of Garden Ridge C5051 N04/25/201512006104/21/201511005904/19/201514005404/15/2015110051
Seguin Outdoor Learning Center C5061 N04/21/201510005703/28/201510004704/19/201511004604/13/2015110044
Heritage Middle School C6221 N04/25/201511006202/10/201511006003/07/201511005904/21/2015110056
CPS Pecan Valley C6781 N03/07/201511005401/19/201511005304/25/201511005102/10/2015100051
Corpus Christi-Victoria
Corpus Christi West C4204/21/201508005503/13/201511005303/27/201512005204/15/2015150051
Corpus Christi Tuloso C21103/23/201510005203/13/201511005102/10/201510005102/09/2015110051
Victoria C87104/21/201510005504/15/201512005202/14/201510005102/10/2015110051
Inez C6091 N04/21/201510005504/25/201511004804/22/201508004504/20/2015080045
Coleto C6241 N04/21/201510005804/15/201514005004/22/201508004804/20/2015080046
Aransas Pass C6591 N03/27/201516006004/15/201514005504/21/201507005402/12/2015150054
Holly Road C6601 N03/27/201513005104/21/201508004802/14/201510004602/10/2015110046
Violet C6641 N04/21/201509005303/14/201510004903/13/201511004802/26/2015110048
Ingleside C6851 N04/21/201508005003/27/201518005004/15/201513004703/16/2015140046
Odem C6861 N04/21/201510004803/23/201512004802/10/201510004803/27/2015110047
Taft C6871 N03/23/201511004804/15/201514004603/14/201510004601/18/2015100045
Cuero C16021 N04/21/201510005504/20/201510004604/19/201511004604/25/2015110045
Lower Rio Grande Valley
Mission C43/AP143104/20/201515005003/14/201511004404/21/201511004303/23/2015110043
Brownsville C80/AGP180104/20/201512005402/13/201511005102/12/201514005004/14/2015100049
Harlingen Teege C1023104/20/201513005402/14/201510005202/13/201511005102/10/2015110050
Laredo
Laredo Vidaurri C44/AFGP144/P244103/14/201510004802/13/201511004703/07/201510004402/26/2015110043
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.