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Four Highest Eight-Hour Ozone Concentrations in 2016
as of February 9

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 2016 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 202/06/201610004301/30/201611004302/07/201610004201/24/2016100042
Keller C17201/30/201615004702/06/201611004602/05/201612004401/24/2016110044
Frisco C31/C680102/06/201610004501/30/201613004502/07/201610004202/05/2016110041
Midlothian OFW C52/A137101/30/201613004601/13/201611004502/05/201613004301/24/2016110043
Denton Airport South C56/A163/X157102/06/201610004702/07/201610004402/05/201611004401/24/2016110044
Arlington Municipal Airport C61101/30/201612004401/24/201611004202/07/201610004102/05/2016110041
Dallas North No.2 C63/C679101/30/201613004602/06/201610004402/07/201610004302/01/2016140042
Rockwall Heath C69102/06/201610004501/30/201613004401/24/201612004302/05/2016110042
Grapevine Fairway C70/A301/X182102/06/201610004602/07/201611004401/30/201613004301/24/2016100042
Kaufman C71/A304/X071101/13/201612004601/30/201612004501/24/201612004402/06/2016130043
Granbury C73/C681102/06/201610004801/30/201615004702/05/201612004601/24/2016110045
Eagle Mountain Lake C75 101/30/201613004702/06/201610004602/05/201611004601/24/2016120045
Parker County C76102/06/201610004802/05/201611004801/30/201614004801/24/2016130047
Cleburne Airport C77/C682101/30/201613005002/06/201613004802/05/201612004601/24/2016110046
Dallas Hinton St. C401/C60/AH161 301/30/201613004502/06/201610004401/24/201612004302/07/2016100042
Dallas Executive Airport C402101/30/201615004301/13/201610004302/07/201610004002/06/2016110040
Greenville C1006/A198101/30/201612004702/06/201609004601/29/201611004401/24/2016120044
Pilot Point C1032102/06/201610004501/30/201612004402/07/201610004201/24/2016110041
Italy C1044/A323101/13/201612004802/05/201610004501/30/201612004501/14/2016100044
Corsicana Airport C1051101/13/201611004702/01/201613004501/30/201611004502/05/2016100043
Tyler-Longview-Marshall
Longview C19/A127/C644201/30/201613004901/29/201612004901/13/201611004602/05/2016100045
Tyler Airport Relocated C82101/29/201612005101/13/201612005001/30/201612004902/06/2016120048
Karnack C85/AFHP303101/30/201613005002/07/201610004702/02/201609004502/06/2016110044
El Paso-Juarez
El Paso UTEP C12/A125/X151201/31/201622004001/24/201610004002/02/201611003902/01/2016010039
Ascarate Park SE C37/A332/A172/X159102/05/201611003901/21/201608003801/15/201619003802/04/2016090036
Chamizal C41/AH126 101/24/201611004301/31/201610004201/21/201609004101/15/2016190041
Socorro Hueco C49/F312102/05/201610004002/02/201609004001/21/201608004002/04/2016100039
Skyline Park C72101/24/201618004701/25/201610004301/15/201612004301/14/2016170043
BRAVO Big Bend C67/C316/C656/C6913 N01/24/201615005201/31/201611004601/21/201611004601/16/2016100046
Ivanhoe C414101/24/201618004202/03/201610004001/15/201615004002/01/2016140039
Waco
Waco Mazanec C1037101/13/201612004702/05/201612004602/07/201612004501/30/2016120045
Temple Georgia C1045101/30/201612004902/06/201610004801/24/201611004802/07/2016110047
Killeen Skylark Field C1047101/30/201612005101/24/201611004901/13/201611004902/05/2016110047
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 202/07/201611004601/29/201611004202/05/201610004101/30/2016090041
West Orange C9/A141202/07/201611004501/29/201612004401/13/201611004002/05/2016110039
Port Arthur West C28/A128/A228102/07/201611004901/13/201611004702/05/201609004501/29/2016110045
Hamshire C64/C654102/07/201611005101/13/201610004901/29/201611004601/19/2016100046
SETRPC Port Arthur C6281 N02/07/201612005001/29/201611004502/05/201609004301/30/2016080043
SETRPC 40 Sabine Pass C640/C1654102/07/201611005301/13/201610004801/30/201609004601/29/2016110046
SETRPC Mauriceville 42 C642/C311/C6651 N01/13/201611004702/07/201611004501/29/201611004401/15/2016100043
SETRPC 43 Jefferson Co Airport C643102/07/201610004101/13/201610003902/05/201609003801/29/2016110038
Nederland High School C1035 102/07/201611004901/29/201611004601/13/201611004602/05/2016100045
Austin
Austin Northwest C3/A322202/07/201611005102/05/201612005001/13/201611005001/30/2016110049
Audubon C38101/30/201612005101/29/201612004801/24/201611004801/13/2016110048
Houston-Galveston-Brazoria
Houston East C1/G316202/07/201610005101/29/201612004901/30/201610004801/24/2016100048
Houston Aldine C8/AF108/X150 202/07/201610004901/30/201610004701/19/201610004601/24/2016110045
Channelview C15/AH115 302/07/201610004401/30/201610004201/29/201612004102/06/2016100038
Northwest Harris Co. C26/A110/X154202/07/201610004401/29/201612004401/30/201610004201/24/2016110042
Hou.DeerPrk2 C35/235/1001/AFH139FP239102/07/201610004401/30/201610004301/29/201612004301/19/2016100043
Seabrook Friendship Park C45102/07/201611004502/05/201611004301/19/201610004301/30/2016100042
Houston Bayland Park C53/A146 102/07/201611004402/05/201610004101/24/201611004101/19/2016100041
Conroe Relocated C78/A321102/07/201610005201/30/201610004801/29/201611004701/13/2016110047
Manvel Croix Park C84102/07/201610004801/29/201611004701/19/201610004702/05/2016100046
Clinton C403/C304/AH113 302/07/201610004301/24/201610004001/30/201610003902/05/2016100038
Houston North Wayside C405102/07/201610004001/24/201610003701/20/201611003702/05/2016100036
Houston Monroe C406101/29/201611004002/07/201610003901/30/201610003801/19/2016090037
Lang C408202/07/201611004601/30/201610004301/29/201611004201/24/2016100042
Houston Croquet C409202/07/201610004401/29/201611004301/19/201610004301/13/2016110043
Houston Westhollow C410102/07/201611004601/13/201611004502/05/201611004401/19/2016100043
Houston Texas Avenue C411102/07/201611004301/30/201610003901/29/201612003801/24/2016100038
Park Place C416102/07/201610004002/05/201610003701/24/201610003701/19/2016090037
Sheldon C5511 N02/07/201611005301/30/201610004701/29/201612004602/05/2016100045
Baytown Wetlands Center C5521 N01/13/201611003202/07/201609003002/05/201610002901/19/2016090029
Crosby Library C5531 N02/07/201611005302/02/201613004601/30/201610004602/08/2016130045
West Houston C5541 N02/07/201611004501/29/201611004302/05/201611004201/24/2016110042
La Porte Sylvan Beach C5561 N02/07/201611004002/05/201610004001/30/201610003902/06/2016100036
Mercer Arboretum C5571 N02/07/201610003502/05/201610003201/30/201610003201/19/2016100032
Tom Bass C5581 N02/07/201610004001/29/201612003902/05/201611003801/19/2016100038
Katy Park C5591 N02/07/201611003702/05/201611003701/24/201611003601/29/2016120035
Atascocita C5601 N02/07/201611004101/30/201610003602/05/201610003501/13/2016100035
Meyer Park C5611 N02/07/201611003801/24/201611003701/29/201611003601/19/2016100036
Bunker Hill Village C5621 N02/07/201610004502/05/201610004101/29/201611004101/30/2016100040
Huffman Wolf Road C5631 N02/07/201610005301/13/201611004801/30/201610004502/05/2016100044
HRM-3 Haden Road C603/A114 1 N02/07/201610004801/30/201610004401/29/201612004302/05/2016110042
Wallisville Road C617 1 N02/07/201610004601/13/201611004601/19/201609004501/30/2016090044
Danciger C618 1 N01/13/201610004602/07/201610004401/29/201611004401/19/2016100044
Texas City 34th St. C620 1 N02/07/201611004701/19/201608004602/05/201609004501/13/2016100045
UH Moody Tower C6951 N02/07/201611004601/29/201613004501/19/201610004501/24/2016100043
U of H-Sugarland C6961 N02/07/201612004501/13/201611004501/29/201612004302/05/2016100042
UH Coastal Center C6971 N02/07/201611004601/19/201610004501/29/201612004401/13/2016100044
UH WG Jones Forest C6981 N02/07/201611005101/29/201612004802/02/201612004601/30/2016100046
UH West Liberty C6991 N02/07/201610005401/30/201610004901/13/201610004801/19/2016100047
Lynchburg Ferry C1015/A165 101/30/201610004102/07/201612004001/29/201612004002/05/2016100038
Lake Jackson C1016 102/07/201610005002/05/201610005001/29/201611004902/06/2016110048
Baytown Garth C1017101/13/201611004702/07/201610004601/19/201610004502/05/2016100043
Galveston 99th St. C1034/A320/X183102/07/201610005101/29/201612005102/05/201615004901/19/2016080049
San Antonio
San Antonio Northwest C23202/07/201610004902/05/201612004701/30/201611004601/24/2016110045
Camp Bullis C58102/07/201610005002/05/201612004901/30/201611004901/24/2016110047
Calaveras Lake C59102/07/201611004802/05/201611004701/24/201610004402/02/2016100043
Heritage Middle School C6221 N02/07/201611004702/05/201611004601/30/201612004601/29/2016110045
CPS Pecan Valley C6781 N02/05/201611003901/30/201611003801/13/201610003802/07/2016100037
Corpus Christi-Victoria
Corpus Christi West C4201/29/201611004602/07/201610004502/05/201609004501/24/2016100045
Corpus Christi Tuloso C21102/07/201610004401/29/201610004402/02/201609004301/24/2016090043
Victoria C87102/07/201611004702/02/201610004701/29/201611004701/24/2016110047
Holly Road C6601 N01/29/201613004101/24/201616004002/07/201610003902/05/2016090039
Odem C6861 N02/05/201610004401/29/201611004302/07/201610004202/02/2016100042
Taft C6871 N02/07/201610004002/05/201610004001/29/201611003901/24/2016090039
Lower Rio Grande Valley
Mission C43/AP143101/25/201611004002/04/201611003901/31/201610003901/23/2016110037
Brownsville C80/AGP180101/16/201611004701/24/201610004502/05/201609004401/04/2016120044
Harlingen Teege C1023101/31/201610004801/24/201610004601/16/201612004502/07/2016100044
Laredo
Laredo Vidaurri C44/AFGP144/P244102/05/201611004102/07/201610003902/06/201610003802/02/2016100038
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.