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Four Highest Eight-Hour Ozone Concentrations in 2015
as of March 31

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 203/28/201510004803/24/201511004603/14/201510004602/10/2015120046
Keller C17203/28/201512005001/20/201513004802/10/201513004703/25/2015110046
Frisco C31/C680103/28/201512006003/24/201511005301/20/201512005203/23/2015110050
Midlothian OFW C52/A137103/28/201512005001/28/201512004903/24/201511004702/10/2015130046
Denton Airport South C56/A163/X157103/28/201511005803/23/201512005303/25/201511005203/24/2015110051
Arlington Municipal Airport C61103/28/201512004802/10/201512004603/24/201511004503/07/2015110045
Dallas North No.2 C63/C679103/28/201512005703/24/201511005101/28/201514004901/20/2015120049
Rockwall Heath C69103/28/201512005701/20/201512005703/07/201511005101/28/2015120051
Grapevine Fairway C70/A301/X182103/28/201512005401/20/201512005103/24/201511004903/23/2015110048
Kaufman C71/A304/X071103/28/201512005501/28/201512005103/07/201510004902/14/2015130049
Granbury C73/C681102/10/201513005103/14/201510005003/28/201510004903/27/2015110048
Eagle Mountain Lake C75 103/28/201510005001/20/201512005002/10/201512004703/23/2015110046
Parker County C76101/20/201512005902/10/201515005703/28/201511005103/14/2015120051
Cleburne Airport C77/C682102/10/201512005201/20/201510005003/28/201512004903/24/2015120049
Dallas Hinton St. C401/C60/AH161 303/28/201512005403/24/201511004901/28/201513004903/07/2015110046
Dallas Executive Airport C402103/28/201512004901/28/201513004702/10/201512004503/24/2015110044
Greenville C1006/A198101/20/201511005401/28/201511005203/28/201510005103/25/2015120050
Pilot Point C1032103/28/201511005703/24/201511005303/25/201511005103/16/2015120051
Italy C1044/A323103/28/201511005502/11/201512005102/10/201512004903/07/2015100047
Corsicana Airport C1051103/28/201510005201/28/201512005202/11/201512004902/14/2015130048
Tyler-Longview-Marshall
Longview C19/A127/C644201/28/201513006103/28/201512005303/07/201510005203/24/2015100048
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/X151203/13/201519005303/12/201510005303/15/201510005203/14/2015090050
Ascarate Park SE C37/A332/A172/X159103/15/201510004903/13/201510004903/14/201509004603/11/2015100046
Chamizal C41/AH126 103/29/201511005003/28/201511005003/25/201510005003/15/2015100050
Socorro Hueco C49/F312103/12/201510005303/29/201510005203/27/201510005203/13/2015090052
Skyline Park C72103/12/201510005603/25/201510005203/15/201510005203/29/2015120051
BRAVO Big Bend C67/C316/C656/C6913 N03/14/201514005703/23/201510005403/13/201523005403/11/2015140054
Ivanhoe C414103/29/201511005003/25/201510004903/15/201510004903/12/2015100049
Waco
Waco Mazanec C1037103/28/201511005602/11/201512005402/10/201512005101/28/2015120050
Temple Georgia C1045103/28/201511006002/10/201513006003/14/201511005302/11/2015110052
Killeen Skylark Field C1047102/10/201513006703/28/201512005702/11/201512005703/14/2015100055
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 203/14/201511005902/14/201511005803/28/201510005703/15/2015110055
West Orange C9/A141203/14/201511006003/28/201512005502/14/201510005402/11/2015120049
Port Arthur West C28/A128/A228103/14/201511006002/14/201511005803/28/201511005503/15/2015120051
Hamshire C64/C654101/28/201510006103/14/201511006002/14/201510006003/28/2015100058
SETRPC Port Arthur C6281 N03/14/201510005903/28/201511005702/14/201510005703/15/2015110051
SETRPC 40 Sabine Pass C640/C1654102/14/201510005102/11/201511005003/14/201511004702/15/2015100047
SETRPC Mauriceville 42 C642/C311/C6651 N03/28/201511005803/14/201511005702/11/201512005402/15/2015110053
SETRPC 43 Jefferson Co Airport C643103/14/201510005703/28/201511005502/14/201510005403/15/2015110048
Nederland High School C1035 103/14/201511006203/28/201511005702/14/201510005503/15/2015120052
Austin
Austin Northwest C3/A322202/10/201512005803/28/201510005403/14/201511005302/14/2015110052
Audubon C38102/10/201513006403/28/201510005803/24/201511005403/23/2015110054
Fayette County C6012 N03/28/201510005303/07/201513005303/14/201512005203/06/2015110051
Dripping Springs School C6141 N03/28/201510005703/24/201511005603/14/201511005103/07/2015110049
CAPCOG McKinney Roughs C6841 N03/14/201512005803/28/201510005503/27/201512005303/07/2015120052
CAPCOG Lake Georgetown C6901 N03/28/201511005903/24/201511005503/14/201510005203/25/2015100050
Gorzycki Middle School C16031 N03/28/201510006503/27/201511005703/14/201511005603/29/2015100053
Lockhart C16041 N03/14/201511005503/07/201511005403/28/201511005103/27/2015120048
CAPCOG San Marcos Staples Road C16751 N03/07/201511005903/14/201511005603/28/201510005103/13/2015100050
Houston-Galveston-Brazoria
Houston East C1/G316203/28/201511005503/24/201510004903/25/201509004803/14/2015100046
Houston Aldine C8/AF108/X150 203/28/201510005702/14/201510005703/24/201510005503/25/2015100052
Channelview C15/AH115 302/14/201510005403/28/201510005203/14/201511004703/27/2015110045
Northwest Harris Co. C26/A110/X154203/24/201510005203/28/201511005003/25/201510005002/14/2015100050
Hou.DeerPrk2 C35/235/1001/AFH139FP239102/14/201510005303/28/201511004903/05/201522004903/14/2015110045
Seabrook Friendship Park C45102/14/201510005803/28/201510005302/19/201513005203/14/2015100050
Houston Bayland Park C53/A146 102/14/201510005103/23/201512005002/19/201513004901/28/2015100048
Conroe Relocated C78/A321103/24/201512006803/25/201511006401/28/201512005903/28/2015110057
Manvel Croix Park C84103/15/201512005703/23/201512005502/14/201511005503/28/2015100053
Clinton C403/C304/AH113 302/14/201510004503/23/201510004402/15/201511004303/28/2015100041
Houston North Wayside C405103/28/201511004403/24/201511004303/25/201510004203/23/2015100040
Houston Monroe C406102/14/201510005003/15/201511004703/28/201510004603/23/2015110042
Lang C408203/24/201510005203/28/201510005102/14/201510005103/25/2015100046
Houston Croquet C409203/23/201512005302/14/201511005301/28/201510005003/28/2015100049
Houston Westhollow C410103/28/201510005103/23/201511005102/14/201510004903/24/2015100048
Houston Texas Avenue C411102/14/201510004803/28/201511004603/24/201511004403/23/2015100043
Park Place C416102/14/201510005103/28/201510004803/24/201510004703/23/2015130046
Sheldon C5511 N02/14/201510005103/28/201510004803/27/201511004403/24/2015100043
Baytown Wetlands Center C5521 N02/14/201510003603/14/201509003503/28/201510003301/28/2015100033
Crosby Library C5531 N01/28/201511005303/28/201511005202/14/201510005103/24/2015110049
West Houston C5541 N02/11/201511005102/14/201510005001/28/201511005002/19/2015130049
La Porte Sylvan Beach C5561 N02/14/201510005302/19/201511005203/28/201511005003/27/2015110046
Mercer Arboretum C5571 N03/24/201510005103/28/201510004803/25/201510004702/14/2015090045
Tom Bass C5581 N03/15/201512004802/14/201510004603/23/201513004503/28/2015100044
Katy Park C5591 N02/25/201511004903/28/201510004702/14/201510004503/24/2015100042
Atascocita C5601 N03/28/201511004603/24/201510004603/25/201509004402/14/2015100044
Meyer Park C5611 N02/14/201510004901/28/201511004701/20/201510004501/19/2015100044
Bunker Hill Village C5621 N02/14/201511004803/28/201510004603/24/201510004603/23/2015110046
Huffman Wolf Road C5631 N01/28/201511005903/24/201510005803/28/201510005703/25/2015100051
Clear Brook High School C5701 N02/14/201510005402/19/201512004801/20/201510004802/15/2015120047
Clear Creek High School C5711 N02/14/201510006002/15/201511005302/19/201512005201/28/2015110052
Clear Lake High School C5721 N02/14/201510005501/20/201510005002/19/201511004902/15/2015110048
HRM-3 Haden Road C603/A114 1 N02/14/201510006003/28/201510005503/27/201510005003/25/2015100048
Wallisville Road C617 1 N01/28/201510006203/14/201511005803/28/201510005701/20/2015110055
Danciger C618 1 N03/23/201512005502/14/201510005303/28/201510005201/19/2015100051
Mustang Bayou C619 1 N03/30/201513005903/23/201512005503/28/201510005202/14/2015100052
Texas City 34th St. C620 1 N03/28/201510005602/14/201510005603/14/201510005301/28/2015110053
UH Moody Tower C6951 N02/14/201510005601/28/201510005403/28/201510005203/24/2015100051
U of H-Sugarland C6961 N02/14/201511005002/19/201513004803/23/201512004701/19/2015110047
UH Coastal Center C6971 N02/19/201512004503/28/201511004202/15/201512004202/14/2015110042
UH WG Jones Forest C6981 N03/25/201512006103/28/201511005601/20/201511005502/14/2015110053
UH West Liberty C6991 N01/28/201511006503/28/201510006403/24/201510006103/30/2015100056
Lynchburg Ferry C1015/A165 102/14/201510004903/28/201511004702/19/201513004703/14/2015120043
Lake Jackson C1016 102/14/201510005402/15/201511005103/28/201509005003/14/2015100050
Baytown Garth C1017101/28/201510006102/14/201511006003/14/201510005703/28/2015110056
Galveston 99th St. C1034/A320/X183103/28/201509005602/19/201512005603/23/201513005403/27/2015130053
San Antonio
San Antonio Northwest C23203/07/201512006002/10/201511005901/19/201511005603/23/2015110053
Camp Bullis C58103/23/201511006003/07/201511005902/10/201511005903/28/2015110053
Calaveras Lake C59103/07/201511005802/10/201511005702/09/201511005301/19/2015110052
Fair Oaks Ranch C5021 N03/30/201511003603/31/2015060031No DataNo Data
New Braunfels Airport C5041 N03/31/2015060029No DataNo DataNo Data
Seguin Outdoor Learning Center C5061 N03/28/201510004703/29/201511004303/30/201512004003/31/2015060030
Heritage Middle School C6221 N02/10/201511006003/07/201511005902/09/201512005501/19/2015120055
CPS Pecan Valley C6781 N03/07/201511005401/19/201511005302/10/201510005103/28/2015100047
Corpus Christi-Victoria
Corpus Christi West C4203/13/201511005303/27/201512005203/23/201512005003/14/2015100050
Corpus Christi Tuloso C21103/23/201510005203/13/201511005102/10/201510005102/09/2015110051
Victoria C87102/14/201510005102/10/201511005103/28/201511005002/13/2015110050
Aransas Pass C6591 N03/27/201516006002/12/201515005403/13/201511005303/07/2015120051
Holly Road C6601 N03/27/201513005102/14/201510004602/10/201511004603/07/2015100045
Violet C6641 N03/14/201510004903/13/201511004802/26/201511004803/23/2015110047
Ingleside C6851 N03/27/201518005003/16/201514004603/07/201512004603/23/2015110043
Odem C6861 N03/23/201512004802/10/201510004803/27/201511004702/14/2015100047
Taft C6871 N03/23/201511004803/14/201510004601/18/201510004503/13/2015110044
Lower Rio Grande Valley
Mission C43/AP143103/14/201511004403/23/201511004303/27/201511004203/07/2015110042
Brownsville C80/AGP180102/13/201511005102/12/201514005002/14/201510004703/27/2015100046
Harlingen Teege C1023102/14/201510005202/13/201511005102/10/201511005003/27/2015100049
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.