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Peak Daily One-Hour Ozone Averages for September 2019

The table below lists the peak daily one-hour ozone concentrations measured in September 2019 in each community where the TCEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight using AQI colors
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 275707171736859404144353950566353402Ft. Worth Northwest C13/AH302
Keller C17272748075847663414446405175737674562Keller C17
Frisco C31/C680153546053969778444952424977596054521Frisco C31/C680
Midlothian OFW C52/A137152505152575758384548394453555749401Midlothian OFW C52/A137
Denton Airport South C56/A163/X157155587958738166404549384870656160491Denton Airport South C56/A163/X157
Arlington Municipal Airport C61163585056686558394447404456556054381Arlington Municipal Airport C61
Dallas North No.2 C63/C679159636259909071424953375075696557501Dallas North No.2 C63/C679
Rockwall Heath C69149534750857864465050374568555547511Rockwall Heath C69
Grapevine Fairway C70/A301/X182159607658868870404550394574696867531Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071152524953616061495153384357645657391Kaufman C71/A304/X071
Granbury C73/C681160615652575653444542395254596563471Granbury C73/C681
Eagle Mountain Lake C75 174788787727662434349415167798384561Eagle Mountain Lake C75
Parker County C76167776986626057464448394852687584621Parker County C76
Cleburne Airport C77/C682159555455595864424650426366626456461Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 361565449777358364447354359606554423Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402167595559727364425255445060646760441Dallas Executive Airport C402
Greenville C1006/A198154474546696865394649334365595647491Greenville C1006/A198
Pilot Point C1032154538551738782485250475360605953481Pilot Point C1032
Italy C1044/A323156544755555862415050425161606048411Italy C1044/A323
Corsicana Airport C1051158544757565972475056395065586345371Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Longview C19/A127/C644259575863777863504955414468666744462Longview C19/A127/C644
Tyler Airport Relocated C82158505966576362514853384264657162NA1Tyler Airport Relocated C82
Karnack C85/AFHP303155475657606875615455434956525148461Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125253615856566661555843365146424368502El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591NANA5055525352536047305141393857501Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 152565454565957586351365639394162521Chamizal C41/AH126
Socorro Hueco C49/F312148515356554846675750395743414149621Socorro Hueco C49/F312
Skyline Park C72150505555575662597149385144424372531Skyline Park C72
Ivanhoe C414/F514147515256535251606453394942434158551Ivanhoe C414/F514
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Waco Mazanec C1037159554951606963425250435667596249401Waco Mazanec C1037
Temple Georgia C1045154555647556261434743455258627150381Temple Georgia C1045
Killeen Skylark Field C1047155555148526261454640414857636752391Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 246284561707763455945353966734348292Beaumont-Downtown C2/A112/C2002
West Orange C9/A141241275264626480634843334162655345322West Orange C9/A141
Port Arthur West C28/A128/A228153324046767260435452303663575838321Port Arthur West C28/A128/A228
Hamshire C64/C65414732655550NANANA4138112762NANA42381Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C1654161503544797057455345313359535035351SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N43293656475787745143364450654445331SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643153356265738168495849344064686644361SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 142325850647460425140273561645039301Nederland High School C1035
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Austin Northwest C3/A322261565051607361404343384061595550412Austin Northwest C3/A322
Audubon C38155554746648264414543414759585450401Audubon C38
Dripping Springs School C6141 N61555555536558414043424258605755411Dripping Springs School C614
CAPCOG Lake Georgetown C6901 NNANANANA273432222522263161656154431CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N57515051466353434241374056565353391Gorzycki Middle School C1603
Lockhart C16041 N50484749354942414143363552554950361Lockhart C1604
St. Edwards University C16051 N54494645465949363737343554514847341St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N51464647566343364540373456534749341CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N54464749546153384640343852545149361CAPCOG Elgin C1613
CAPCOG San Marcos Staples Road C16751 N58525554365550493844404155585455461CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N51NANANA526459384439374153575449391CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Houston East C1/G316246364660748963425249384259644830302Houston East C1/G316
Houston Aldine C8/AF108/X150 24940326910512174616558556160705146372Houston Aldine C8/AF108/X150
Channelview C15/AH115 348343860737482565447363856634831323Channelview C15/AH115
Northwest Harris Co. C26/A110/X15425038335511110249466163747253694144342Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239159436059637750405246333859664735331Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45158364758569952395047NANA61684640371Seabrook Friendship Park C45
Houston Bayland Park C53/A146 162466679898358435856455678796244351Houston Bayland Park C53/A146
Conroe Relocated C78/A321144393043718371777960474646514041321Conroe Relocated C78/A321
Manvel Croix Park C84168515860655941384944364063685039361Manvel Croix Park C84
Clinton C403/C304/AH113 348374661657953414245424158644836333Clinton C403/C304/AH113
Houston North Wayside C405142353561839864475449414553624734291Houston North Wayside C405
Houston Monroe C406161475858667252414744404462675037371Houston Monroe C406
Lang C4082554238661009661445151655555644839302Lang C408
Houston Croquet C409259415859736548394847374567665739332Houston Croquet C409
Houston Westhollow C410158475973887743415149425671735545321Houston Westhollow C410
Park Place C416158446060747956435047404665715638371Park Place C416
Sheldon C5511 N40342865788041282625172326332627251Sheldon C551
Baytown Wetlands Center C5521 N51345956577764475245303362634736341Baytown Wetlands Center C552
Crosby Library C5531 N433730656877108715654364536NANANANA1Crosby Library C553
West Houston C5541 N51434364929145425151575860715044311West Houston C554
La Porte Sylvan Beach C5561 N43314047518347394543283055543836321La Porte Sylvan Beach C556
Mercer Arboretum C5571 N38322541949462535855424541493333251Mercer Arboretum C557
Tom Bass C5581 N65476359666649424944394767695138341Tom Bass C558
Katy Park C5591 N53455368868240415153525563725047381Katy Park C559
Atascocita C5601 N3932NANANANANANANANA163537383129251Atascocita C560
Meyer Park C5611 N4740305111611965516064666750604042301Meyer Park C561
Bunker Hill Village C5621 N50414764867951384444394359634739211Bunker Hill Village C562
Huffman Wolf Road C5631 N453934547285114735853374355574239341Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N49374963699169465651454262675036321HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N44343962726987525350343956654939371Wallisville Road C617
Danciger C618 1 N68534351615737314947376660685444391Danciger C618
Texas City 34th St. C620 1 N77485862639651415553404767776445411Texas City 34th St. C620
UH Moody Tower C6951 N55446074868562485251434968745640361UH Moody Tower C695
UH WG Jones Forest C6981 N484030461008667688366495250544342341UH WG Jones Forest C698
UH West Liberty C6991 N413431556869107635143333950533837301UH West Liberty C699
Lynchburg Ferry C1015/A165 144354659787074485447333758614735341Lynchburg Ferry C1015/A165
Lake Jackson C1016 168463745525227304443313556674639381Lake Jackson C1016
Baytown Garth C1017147364166737392535449344160674739401Baytown Garth C1017
Galveston 99th St. C1034/A320/X183181573958638150475553374467756144451Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N75533555515338404945353766765840411Oyster Creek C1607
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
San Antonio
San Antonio Northwest C23260586056466958393942445158635859472San Antonio Northwest C23
Camp Bullis C58 165595955467165404247435458645956441Camp Bullis C58
Calaveras Lake C59152525162426344373842364355625152531Calaveras Lake C59
Elm Creek Elementary C5011 N57565350444247323338324452584853571Elm Creek Elementary C501
Fair Oaks Ranch C5021 N56545246396760373942405053555252391Fair Oaks Ranch C502
Bulverde Elementary C5031 N55545445345759363740364352545153401Bulverde Elementary C503
New Braunfels Airport C5041 N48454447314945353538363649545047411New Braunfels Airport C504
City of Garden Ridge C5051 N50515249345149353537334154565453431City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N46484462345141353739333549554947341Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N45494560406038323639314150554748511Heritage Middle School C622
CPS Pecan Valley C6781 N44514453365445313136293947514648521CPS Pecan Valley C678
Government Canyon C16101 N58565749446955343638455460635861431Government Canyon C1610
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4258454629353229282835312643664349482Corpus Christi West C4
Corpus Christi Tuloso C21160444227363435302935332743604449471Corpus Christi Tuloso C21
Victoria C87159535545334937343352332948745648381Victoria C87
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP143141433123363635312625362731384338611Mission C43/AP143
Harlingen Teege C1023148322927312938372932462833394536421Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P244140444431303438373532373534454842621Laredo Vidaurri C44/AFGP144/P244
NA - Data not available.
 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
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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.