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Four Highest Eight-Hour Ozone Concentrations in 2017
as of January 17

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 2017 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 201/11/201713003801/09/201713003701/08/201710003501/07/2017090034
Keller C17201/11/201713003801/09/201712003701/08/201711003701/10/2017110033
Frisco C31/C680101/11/201711003801/09/201712003701/08/201710003501/07/2017100033
Midlothian OFW C52/A137101/11/201712004101/08/201711004101/09/201711004001/10/2017090035
Denton Airport South C56/A163/X157101/11/201712003901/09/201712003901/08/201711003901/07/2017100036
Arlington Municipal Airport C61101/11/201711003601/09/201711003601/08/201711003601/10/2017100032
Dallas North No.2 C63/C679101/11/201711003801/09/201712003601/08/201711003501/10/2017090032
Rockwall Heath C69101/11/201712003701/09/201713003601/08/201710003601/07/2017100032
Grapevine Fairway C70/A301/X182101/08/201710003501/07/201710003401/06/201707003201/02/2017100032
Kaufman C71/A304/X071101/11/201710003901/10/201710003801/09/201711003801/08/2017100038
Granbury C73/C681101/11/201713004001/09/201713003901/08/201711003901/07/2017100036
Eagle Mountain Lake C75 101/11/201713003701/09/201713003401/08/201710003101/07/2017100030
Parker County C76101/08/201713003701/11/201713003601/09/201713003601/07/2017100035
Cleburne Airport C77/C682101/11/201711004601/09/201712004601/08/201711004501/07/2017100043
Dallas Hinton St. C401/C60/AH161 301/11/201711003801/09/201712003701/08/201710003701/02/2017100032
Dallas Executive Airport C402101/11/201712003501/09/201711003401/08/201710003401/10/2017090029
Greenville C1006/A198101/11/201712003901/09/201711003701/08/201710003701/10/2017090035
Pilot Point C1032101/11/201712003801/09/201712003701/08/201712003601/07/2017100035
Italy C1044/A323101/08/201710003901/09/201711003801/11/201710003701/10/2017100035
Corsicana Airport C1051101/11/201712004001/10/201710003901/08/201711003901/09/2017110038
Tyler-Longview-Marshall
Longview C19/A127/C644201/11/201711004001/08/201710003801/12/201711003601/02/2017110035
Tyler Airport Relocated C82101/11/201710003901/08/201710003901/02/201711003901/09/2017120037
Karnack C85/AFHP303101/11/201710004001/10/201709003601/08/201710003601/12/2017100035
El Paso-Juarez
El Paso UTEP C12/A125/X151201/02/201709004201/15/201707004101/04/201710003701/01/2017210037
Ascarate Park SE C37/A332/A172/X159101/15/201707003901/02/201709003901/01/201721003801/07/2017090034
Chamizal C41/AH126 101/02/201709004301/15/201707004201/04/201710003801/01/2017210038
Socorro Hueco C49/F312101/15/201707003901/02/201709003901/01/201722003601/07/2017100034
Skyline Park C72101/02/201707004501/15/201707004201/04/201710004101/01/2017230041
BRAVO Big Bend C67/C316/C656/C6913 N01/15/201715004701/02/201710004401/03/201713004001/16/2017010038
Ivanhoe C414101/02/201709004201/01/201722003801/15/201707003701/04/2017100037
Waco
Waco Mazanec C1037101/08/201712003901/11/201711003801/09/201711003801/10/2017110036
Temple Georgia C1045101/11/201711004301/08/201711004301/09/201711004201/10/2017100041
Killeen Skylark Field C1047101/11/201710004201/09/201711004201/08/201710004101/10/2017100039
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 201/10/201708003801/03/201710003801/12/201709003601/11/2017090036
West Orange C9/A141201/03/201710003601/10/201709003501/08/201710003501/12/2017100033
Port Arthur West C28/A128/A228101/03/201711004301/10/201707003901/08/201710003801/12/2017100037
Hamshire C64/C654101/03/201711004001/10/201707003901/08/201711003801/12/2017090037
SETRPC 40 Sabine Pass C640/C1654101/03/201710003201/08/201710003001/10/201708002901/09/2017110028
SETRPC 43 Jefferson Co Airport C643101/10/201710004001/03/201710004001/12/201710003601/11/2017060036
Nederland High School C1035 101/10/201707004001/03/201710003901/12/201710003801/11/2017080037
Austin
Austin Northwest C3/A322201/08/201711004001/11/201710003801/09/201711003801/03/2017100038
Audubon C38101/08/201712004201/09/201711004001/11/201710003901/10/2017090037
Houston-Galveston-Brazoria
Houston East C1/G316201/12/201709003601/11/201709003601/10/201710003601/08/2017090035
Houston Aldine C8/AF108/X150 201/03/201710003601/12/201710003501/08/201710003501/02/2017090035
Channelview C15/AH115 301/03/201710003701/02/201709003601/08/201710003501/07/2017110035
Northwest Harris Co. C26/A110/X154201/08/201711003801/14/201710003701/12/201710003601/03/2017100036
Hou.DeerPrk2 C35/235/1001/AFH139FP239101/12/201709003601/10/201709003601/08/201710003601/03/2017100036
Seabrook Friendship Park C45101/08/201713004301/03/201710004301/10/201705004101/16/2017100040
Houston Bayland Park C53/A146 101/03/201710003601/12/201710003501/10/201709003501/08/2017100035
Conroe Relocated C78/A321101/12/201711004101/08/201710004101/14/201710004001/13/2017110039
Manvel Croix Park C84101/03/201710004401/02/201710004001/12/201709003801/10/2017080038
Clinton C403/C304/AH113 301/08/201710003601/14/201709003301/02/201709003301/12/2017090032
Houston North Wayside C405101/08/201710003501/02/201709003201/11/201709002901/10/2017100029
Houston Monroe C406101/10/201709003501/03/201709003401/11/201709003301/08/2017100033
Lang C408201/08/201710003401/03/201710003401/12/201710003301/10/2017100033
Houston Croquet C409201/03/201710003901/12/201710003701/10/201709003601/08/2017100036
Houston Westhollow C410101/03/201710003701/08/201710003501/12/201710003401/02/2017090034
Park Place C416101/08/201710003601/12/201709003401/03/201710003401/02/2017090033
Sheldon C5511 N01/08/201710003201/03/201710003201/07/201709003101/02/2017100031
Baytown Wetlands Center C5521 N01/08/201712003201/09/201710002801/07/201710002801/06/2017220025
West Houston C5541 N01/08/201710003701/03/201710003701/14/201710003601/12/2017100035
La Porte Sylvan Beach C5561 N01/03/201709003501/02/201707002401/14/201715001701/13/2017170016
Mercer Arboretum C5571 N01/08/201710003501/14/201710003401/10/201709003401/07/2017100034
Tom Bass C5581 N01/10/201710003401/08/201711003401/03/201709003401/12/2017090032
Katy Park C5591 N01/03/201711003401/08/201711003201/02/201708003101/14/2017110030
Atascocita C5601 N01/08/201709003401/12/201709003201/11/201709003201/10/2017100031
Meyer Park C5611 N01/08/201710003001/12/201710002901/03/201710002801/14/2017100027
Bunker Hill Village C5621 N01/03/201710003401/08/201710003301/07/201709003101/02/2017090031
Huffman Wolf Road C5631 N01/12/201710004301/10/201709004301/09/201710004301/11/2017100042
Clear Brook High School C5701 N01/03/201710003801/12/201709003701/10/201708003601/09/2017110036
Clear Creek High School C5711 N01/03/201710004101/02/201710003501/12/201709003301/11/2017090032
HRM-3 Haden Road C603/A114 1 N01/02/201709003601/12/201709003501/08/201710003501/11/2017100034
Wallisville Road C617 1 N01/12/201709004201/03/201710004201/08/201710004101/02/2017090041
Danciger C618 1 N01/03/201710004101/14/201711003901/08/201710003801/12/2017090037
Texas City 34th St. C620 1 N01/03/201710004401/08/201711004101/14/201712004001/12/2017080040
UH Moody Tower C6951 N01/03/201710004001/08/201710003801/02/201710003701/12/2017090036
U of H-Sugarland C6961 N01/14/201711004001/03/201710003901/11/201709003801/10/2017090038
UH Coastal Center C6971 N01/03/201711004101/12/201709003901/10/201706003801/09/2017100038
UH WG Jones Forest C6981 N01/14/201711004001/12/201710004001/08/201710004001/11/2017090038
UH West Liberty C6991 N01/01/2017120028No DataNo DataNo Data
Lynchburg Ferry C1015/A165 101/08/201711003401/14/201707003001/11/201701002901/10/2017220029
Lake Jackson C1016 101/03/201710004401/12/201709004101/10/201706004101/14/2017090040
Baytown Garth C1017101/12/201710003901/08/201710003901/14/201711003601/09/2017090036
Galveston 99th St. C1034/A320/X183101/03/201711004501/08/201711004401/09/201714004301/10/2017010042
Oyster Creek C1607 1 N01/03/201711004501/14/201710004001/12/201709003901/09/2017080039
San Antonio
San Antonio Northwest C23201/08/201711003901/07/201709003801/03/201710003801/11/2017100037
Camp Bullis C58 101/03/201711004301/08/201711004101/07/201709004001/02/2017100038
Calaveras Lake C59101/03/201711004101/08/201710004001/02/201710004001/09/2017110038
Heritage Middle School C6221 N01/03/201711004001/02/201711004001/08/201712003801/09/2017110037
CPS Pecan Valley C6781 N01/08/201710003701/03/201710003601/02/201710003601/11/2017100035
Corpus Christi-Victoria
Corpus Christi West C4201/03/201710004301/02/201711004101/08/201711004001/09/2017100038
Corpus Christi Tuloso C21101/03/201710004201/08/201711004101/02/201710004101/09/2017100039
Victoria C87101/03/201711004301/02/201710004201/08/201710004001/10/2017090039
Ingleside C6851 N01/01/201709003401/02/2017110033No DataNo Data
Lower Rio Grande Valley
Mission C43/AP143101/07/201710003801/03/201711003401/11/201709003301/10/2017090032
Brownsville C80/AGP180101/10/201710003701/08/201710003601/07/201712003601/13/2017090035
Harlingen Teege C1023101/07/201711003801/08/201711003701/10/201709003601/09/2017100035
Laredo
Laredo Vidaurri C44/AFGP144/P244101/07/201710003301/08/201711003101/03/201710003101/11/2017090028
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

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.