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Daily Maximum Eight-Hour Ozone Averages for September 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 2021 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.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 247373541366068656759636830284252604258472Ft. Worth Northwest C13/AH302
Keller C17250373644376168626561646733303944533757482Keller C17
Frisco C31/C680157424451415387645864667031313536413539601Frisco C31/C680
Midlothian OFW C52/A137133262929454354NV5353586324263840514941481Midlothian OFW C52/A137
Denton Airport South C56/A163/X157147484645395677616371707340353641483847531Denton Airport South C56/A163/X157
Arlington Municipal Airport C611NV323237NV5263765957606524273943554451481Arlington Municipal Airport C61
Dallas North No.2 C63/C679148363642445076665352596425263136403643501Dallas North No.2 C63/C679
Rockwall Heath C69141313138344662604848525822263031302734471Rockwall Heath C69
Grapevine Fairway C70/A301/X182150363746375375596057626626283537483647491Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071136303227404859645050545720263236353338451Kaufman C71/A304/X071
Granbury C73/C681139312834415253685858586330275050623943441Granbury C73/C681
Eagle Mountain Lake C75 154403740356558637164666835333947554058471Eagle Mountain Lake C75
Parker County C76141352933355952606761586241324153544148451Parker County C76
Cleburne Airport C77/C6821463736394757628161626672333050NV574843461Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 341303036445364665248545821243338433741423Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402140303335505264705655596426293938494551521Dallas Executive Airport C402
Greenville C1006/A198138293431364961574752526124303131303130471Greenville C1006/A198
Pilot Point C1032165505249425689645774707240333737433937611Pilot Point C1032
Italy C1044/A323134283233495061664853586223263434414438531Italy C1044/A323
Corsicana Airport C1051138343532475864695755626426273636353839491Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644241424432295164675061555223253029272536422Longview C19/A127/C644
Tyler Airport Relocated C82138333728305669615358555822233232313338471Tyler Airport Relocated C82
Karnack C85/AFHP3031394541413345NANV4661535319272825161630441Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151/G125228516543415654515460596068615858516050372El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X159118404831264446484246505058514756444743311Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 128505940375352464654585849505356465247351Chamizal C41/AH126
Socorro Hueco C49/F312137NV4540395364494946545357715156575051371Socorro Hueco C49/F312
Skyline Park C72131516342374564515659595564525164485549351Skyline Park C72
Ivanhoe C414/F5141NV535241364960525052575361584958505050381Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG221129506244415159565864626071625451NVNANANA1Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Waco
Waco Mazanec C103713330313837506368NV55616426243335394242541Waco Mazanec C1037
Temple Georgia C1045132292833334954675856586429243438463940571Temple Georgia C1045
Killeen Skylark Field C1047145403937375462716566666935274044504244601Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 221262434272444475051672616221511243350302Beaumont-Downtown C2/A112/C2002
West Orange C9/A141227312635313242434652632417191411343742342West Orange C9/A141
Port Arthur West C28/A128/A228122252529353147515758562918221814334452251Port Arthur West C28/A128/A228
Hamshire C64/C654125212735443254506062663619191712233553291Hamshire C64/C654
SETRPC Port Arthur C6281 N232727324239566365635933232721NVNANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654123252726283460555554532720NV2017414546261SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 NNANV41322730454752527432232422NVNANANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643120232229282946475154572718211713244050251SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1212627353029NV475153612719211814274051281Nederland High School C1035
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Austin
Austin North Hills Drive C3/A322233293234374557666167595230253339584349512Austin North Hills Drive C3/A322
Audubon C38130273228284255626066594829243239493844491Audubon C38
Dripping Springs School C6141 N35303333323851676675644831273541524145531Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N39353731274356655959595429233440493845561CAPCOG Lake Georgetown C690
Lockhart C16041 N28232623273043645666614828222837454446431Lockhart C1604
St. Edwards University C16051 N27232628333643595463534627232936544245421St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N2923282426NV5162566564552920273348NV48431CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N28252725323947635763585129213140484045461CAPCOG Elgin C1613
CAPCOG East Austin C16191 N30242829344045625565554929222936584348461CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 NNVNANANANV4349595457534727202932493642511CAPCOG Round Rock Brushy Creek W C1620
CAPCOG San Marcos Staples Road C16751 N28242823332748626070584627283048534748461CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316222242532334653625054655317151613414152312Houston East C1/G316
Houston Aldine C8/AF108/X150 230323443333960NV60NVNANV118231940NVNA462Houston Aldine C8/AF108/X150
Channelview C15/AH115 325253436374852585552604717NVNV17NVNANANA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542302827232335536356557152211721NV263037372Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239126222826326062696563625219162015544552291Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45122232321265949575658524116141510525050231Seabrook Friendship Park C45
Houston Bayland Park C53/A146 128232629275674837265666518192527474348301Houston Bayland Park C53/A146
Conroe Relocated C78/A321133464329293352615556645323212420322945581Conroe Relocated C78/A321
Manvel Croix Park C841241826182645758979715954NVNV2528514443251Manvel Croix Park C84
Clinton C403/C304/AH113 3181819272747556457NV585215181919454043233Clinton C403/C304/AH113
Houston North Wayside C405/C1033115212033263446554946604514NANV15NV3648301Houston North Wayside C405/C1033
Houston Monroe C406122192220274856686457NVNANV151717493941251Houston Monroe C406
Lang C408229212528253764715755675216161717313747332Lang C408
Houston Croquet C409224202524245272837169616317172328514246262Houston Croquet C409
Houston Westhollow C410/C3003123212523224566736761635916162227373643151Houston Westhollow C410/C3003
Park Place C416125212528295963736463626117162018544550301Park Place C416
Houston Harvard Street C417131273036315169816661736018202120494554371Houston Harvard Street C417
Sheldon C5511 N252527332931455346485741NVNANANANANANANA1Sheldon C551
Baytown Wetlands Center C5521 N201924243442495256545242NVNANVNVNANANANA1Baytown Wetlands Center C552
Crosby Library C5531 N32273342353349555052614416NVNV11303152361Crosby Library C553
West Houston C5541 N28232627264073776566705717NV2427343642321West Houston C554
La Porte Sylvan Beach C5561 NNANANANANANANANANANV52401613NVNANANANANA1La Porte Sylvan Beach C556
Tom Bass C5581 N23192419275370817267585417182324554345271Tom Bass C558
Katy Park C5591 N23202321193759676162655719162326313239281Katy Park C559
Atascocita C5601 N25282835272843524345564115151513293049361Atascocita C560
Meyer Park C5611 N24232545273050635353664817161918262836641Meyer Park C561
Bunker Hill Village C5621 N28192224234069756459625515142223333542301Bunker Hill Village C562
Huffman Wolf Road C5631 N38293542332946544648574318182014313348451Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N202326353346576461596453181719NVNANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N272334424041495558556247191922NVNANANANA1Wallisville Road C617
Texas City 34th St. C620 1 NNANV28272372617275706348232125NVNANANANA1Texas City 34th St. C620
UH Moody Tower C6951 NNVNANANV285263746260615815172120504348301UH Moody Tower C695
UH WG Jones Forest C6981 NNVNANV3534443958NV54655222192420333145511UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 124212832354747524253554517NANV9363557271Lynchburg Ferry C1015/A165
Lake Jackson C1016 117162316164369747964564620NA274241444241Lake Jackson C1016
Baytown Garth C1017132304051474753596358685223222518424471421Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831222525181854665771595640NV212420NVNANANA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 NNANV30222151727081635746NVNANANANANANANA1Oyster Creek C1607
UH Launch Trailer C16111 NNVNANANV295262736157625915172019504550321UH Launch Trailer C1611
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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San Antonio
San Antonio Northwest C23230263125263252556176614326253136544545432San Antonio Northwest C23
Camp Bullis C58 14136413433305763698470493230NV37665051561Camp Bullis C58
Calaveras Lake C59128253024243139646668584429353546485253441Calaveras Lake C59
Elm Creek Elementary C5011 N27252822223042597279614227293550434645431Elm Creek Elementary C501
Fair Oaks Ranch C5021 N39293528242340505156543924232928423938461Fair Oaks Ranch C502
Bulverde Elementary C5031 N33303732282245555966584426243133574246511Bulverde Elementary C503
New Braunfels Airport C5041 N27202520262836545259514024272641474345371New Braunfels Airport C504
City of Garden Ridge C5051 N26152424302344546168573923203136604349421City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N28202522222538545262534225272537424345411Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N25232822253336606465554126313243504946411Heritage Middle School C622
CPS Pecan Valley C6781 N17161614152327434954422918202332363735301CPS Pecan Valley C678
Government Canyon C16101 N29262623222046465568624325232630463940421Government Canyon C1610
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4221192316181923676860553324352940394343242Corpus Christi West C4
Corpus Christi Tuloso C21120202416182530646960563123332840434242251Corpus Christi Tuloso C21
Victoria C87125182521242152586559544322252836423841271Victoria C87
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431NANANV25223237557262633227464048384340301Mission C43/AP143
Harlingen Teege C1023122282621202122565947482523343137323525261Harlingen Teege C1023
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.