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Four Highest Eight-Hour Ozone Concentrations in 2017
as of February 20

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 202/01/201711004702/10/201712004602/17/201711004302/16/2017100043
Keller C17202/10/201713004802/18/201712004702/17/201712004702/01/2017110046
Frisco C31/C680102/10/201712004802/18/201712004702/17/201712004602/01/2017120046
Midlothian OFW C52/A137102/17/201710004902/10/201711004702/01/201710004601/31/2017110046
Denton Airport South C56/A163/X157102/18/201712004902/16/201711004902/10/201710004902/01/2017120048
Arlington Municipal Airport C61102/10/201712004502/17/201712004301/31/201710004302/01/2017110042
Dallas North No.2 C63/C679102/10/201712004802/01/201711004701/31/201714004702/18/2017110046
Rockwall Heath C69101/31/201713004702/18/201712004502/17/201711004502/01/2017120044
Grapevine Fairway C70/A301/X182102/10/201712004902/01/201713004702/18/201712004502/17/2017110043
Kaufman C71/A304/X071101/31/201712005102/01/201711004702/18/201711004602/17/2017110046
Granbury C73/C681102/10/201713004802/17/201711004602/16/201710004502/01/2017100045
Eagle Mountain Lake C75 102/10/201710005102/17/201712004802/18/201711004702/01/2017100047
Parker County C76102/10/201709004501/30/201712004402/17/201712004302/16/2017110043
Cleburne Airport C77/C682102/10/201712005202/01/201711004901/23/201711004902/16/2017120048
Dallas Hinton St. C401/C60/AH161 302/10/201712004802/18/201711004402/17/201712004402/01/2017100044
Dallas Executive Airport C402102/17/201712004502/16/201711004301/31/201715004202/12/2017120041
Greenville C1006/A198101/31/201713005002/10/201711004702/17/201711004602/01/2017100045
Pilot Point C1032102/10/201711004902/01/201713004502/17/201712004301/31/2017120043
Italy C1044/A323101/31/201711004902/17/201711004802/01/201711004802/16/2017100047
Corsicana Airport C1051102/18/201712005101/31/201711005102/17/201711004901/30/2017110049
Tyler-Longview-Marshall
Longview C19/A127/C644201/31/201711005301/24/201711005002/16/201710004802/17/2017110047
Tyler Airport Relocated C82101/31/201712005302/16/201712005101/24/201713004802/17/2017100047
Karnack C85/AFHP303101/31/201711005002/17/201711004901/24/201712004801/28/2017110047
El Paso-Juarez
El Paso UTEP C12/A125/X151202/11/201715004902/19/201708004802/18/201721004701/21/2017140045
Ascarate Park SE C37/A332/A172/X159102/19/201709004802/18/201721004701/24/201712004502/11/2017120043
Chamizal C41/AH126 102/19/201709005002/11/201714005002/18/201721004901/21/2017110046
Socorro Hueco C49/F312102/19/201709004702/18/201721004401/21/201714004302/11/2017110041
Skyline Park C72102/11/201715005302/18/201721005102/19/201708005001/24/2017100047
BRAVO Big Bend C67/C316/C656/C6913 N02/15/201708004701/22/201701004701/21/201722004701/15/2017150047
Ivanhoe C414102/11/201715004602/19/201709004501/21/201714004502/18/2017210044
Waco
Waco Mazanec C1037102/01/201711004901/31/201712004902/17/201712004802/16/2017110047
Temple Georgia C1045102/17/201711005301/31/201711005302/01/201711005102/16/2017100050
Killeen Skylark Field C1047102/17/201711005102/01/201712005101/31/201711005102/18/2017120048
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 202/16/201711005101/30/201711004701/24/201710004601/31/2017100045
West Orange C9/A141202/16/201712004901/30/201711004501/31/201710004302/09/2017110042
Port Arthur West C28/A128/A228102/16/201711005201/30/201711004901/31/201710004702/09/2017110046
Hamshire C64/C654102/16/201712005501/31/201710004701/30/201711004701/24/2017090046
SETRPC 40 Sabine Pass C640/C1654102/16/201713005702/17/201714004802/18/201709004602/09/2017100045
SETRPC 43 Jefferson Co Airport C643102/16/201711005201/30/201711005101/31/201710004801/24/2017090047
Nederland High School C1035 102/16/201711005101/31/201710004701/30/201711004702/09/2017120045
Austin
Austin Northwest C3/A322202/18/201711005101/31/201711005002/17/201711004902/01/2017110046
Audubon C38101/31/201711005102/01/201711005002/17/201711004902/18/2017120048
St. Edwards University C16051 N02/19/2017100021No DataNo DataNo Data
Houston-Galveston-Brazoria
Houston East C1/G316201/31/201711004602/16/201713004401/30/201711004401/24/2017090044
Houston Aldine C8/AF108/X150 201/31/201710004802/18/201710004501/30/201711004502/08/2017120044
Channelview C15/AH115 301/31/201711004502/08/201714004402/16/201713004201/29/2017110042
Northwest Harris Co. C26/A110/X154202/16/201710004502/08/201713004401/31/201711004401/29/2017120043
Hou.DeerPrk2 C35/235/1001/AFH139FP239102/16/201711004702/09/201711004401/31/201710004301/30/2017110043
Seabrook Friendship Park C45102/09/201712005202/16/201712005101/31/201710004901/30/2017110048
Houston Bayland Park C53/A146 101/31/201710004602/16/201713004501/30/201710004502/09/2017110042
Conroe Relocated C78/A321101/31/201710005201/30/201711005102/16/201710005002/18/2017110049
Manvel Croix Park C84102/09/201712005302/16/201711005201/30/201710004801/31/2017100046
Clinton C403/C304/AH113 302/09/201711004602/16/201713004201/24/201709004001/29/2017100039
Houston North Wayside C405102/09/201711004101/31/201710004002/16/201713003901/29/2017100038
Houston Monroe C406102/16/201710004001/30/201711004001/29/201710003702/09/2017110036
Lang C408201/31/201709004201/30/201710004202/08/201714004001/29/2017100040
Houston Croquet C409202/16/201712004802/09/201711004501/30/201711004501/31/2017090043
Houston Westhollow C410101/30/201711004502/16/201711004401/31/201710004302/09/2017110042
Park Place C416102/16/201711004402/09/201712004301/31/201710004001/30/2017110040
Sheldon C5511 N02/09/201711003602/08/201713003601/31/201710003601/30/2017110036
Baytown Wetlands Center C5521 N02/16/201713003902/09/201711003501/31/201710003401/30/2017120033
West Houston C5541 N01/08/201710003701/03/201710003701/14/201710003601/12/2017100035
La Porte Sylvan Beach C5561 N01/03/201709003502/16/201713002802/09/201713002802/15/2017110024
Mercer Arboretum C5571 N02/08/201714003801/31/201709003802/18/201711003701/30/2017100037
Tom Bass C5581 N02/09/201713004501/30/201711004101/31/201710004001/29/2017110038
Katy Park C5591 N02/16/201710003901/30/201711003901/29/201710003802/09/2017120036
Atascocita C5601 N01/24/201709003801/29/201710003701/28/201710003701/23/2017100036
Meyer Park C5611 N01/30/201711003702/08/201713003601/31/201710003602/16/2017100034
Bunker Hill Village C5621 N01/03/201710003401/08/201710003301/07/201709003101/02/2017090031
Huffman Wolf Road C5631 N02/08/201713005401/31/201710005301/24/201709005302/18/2017100052
Clear Brook High School C5701 N02/16/201711005202/09/201712004801/30/201711004601/31/2017100044
Clear Creek High School C5711 N01/30/201711004401/31/201710004301/29/201710004301/03/2017100041
HRM-3 Haden Road C603/A114 1 N02/09/201711004602/16/201713004501/31/201710004501/30/2017110044
Wallisville Road C617 1 N02/16/201712004802/08/201712004701/31/201710004602/09/2017100043
Danciger C618 1 N02/16/201712005402/09/201712005001/30/201711004901/31/2017100045
Texas City 34th St. C620 1 N02/09/201712005301/31/201709004901/30/201712004901/29/2017100045
UH Moody Tower C6951 N02/16/201713005001/30/201711004602/09/201711004501/31/2017100045
U of H-Sugarland C6961 N02/09/201713005302/16/201713005201/30/201711004901/31/2017100047
UH Coastal Center C6971 N02/09/201711004801/30/201713004601/31/201710004501/29/2017110043
UH WG Jones Forest C6981 N01/30/201711005202/16/201712005101/31/201710005002/18/2017110049
UH West Liberty C6991 N01/31/201711004702/08/201714004602/18/201710004501/23/2017100044
Lynchburg Ferry C1015/A165 102/16/201714004101/31/201711003901/24/201708003502/08/2017110034
Lake Jackson C1016 102/16/201711005401/30/201712005001/31/201710004701/23/2017110047
Baytown Garth C1017102/09/201712005101/31/201710004802/16/201711004702/08/2017120046
Galveston 99th St. C1034/A320/X183102/16/201715005801/30/201713005501/31/201710005101/23/2017130050
Oyster Creek C1607 1 N02/16/201712004901/03/201711004502/09/201711004402/10/2017080043
San Antonio
San Antonio Northwest C23202/18/201711004901/31/201710004801/21/201721004602/16/2017100045
Camp Bullis C58 101/31/201710005102/17/201710005002/18/201711004901/30/2017100047
Calaveras Lake C59101/31/201711005102/16/201711004902/18/201712004801/30/2017120046
Heritage Middle School C6221 N01/31/201711005102/16/201712005002/18/201712004802/17/2017110046
CPS Pecan Valley C6781 N01/31/201710004602/16/201711004502/18/201711004301/30/2017100043
Corpus Christi-Victoria
Corpus Christi West C4202/16/201711005302/15/201711004801/23/201711004802/17/2017090047
Corpus Christi Tuloso C21101/31/201710005202/16/201711004802/09/201712004801/23/2017100046
Victoria C87102/16/201711005001/31/201710004801/30/201710004702/09/2017120046
Violet C6641 N01/31/201710004902/16/201710004602/09/201712004602/17/2017100041
Ingleside C6851 N02/16/201710004901/23/201706004802/09/201711004601/31/2017110046
Lower Rio Grande Valley
Mission C43/AP143102/09/201712004602/08/201711004502/16/201711004401/22/2017100044
Brownsville C80/AGP180102/16/201711004701/22/201710004702/15/201711004601/30/2017110046
Harlingen Teege C1023102/16/201711004901/30/201711004702/17/201710004602/09/2017110046
Laredo
Laredo Vidaurri C44/AFGP144/P244102/09/201712004102/16/201711004002/18/201711003901/31/2017110037
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, 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.