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Daily Maximum Eight-Hour Ozone Averages for September 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 2018 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 2018POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 237321522253033102115143034363951344549291420NA2Ft. Worth Northwest C13/AH302
Keller C1725544253637NVNV152523273438353755385155321820NA2Keller C17
Frisco C31/C680152402836404555192522313237373848576263412218NA1Frisco C31/C680
Midlothian OFW C52/A137143362533343744242724232731263540334348302122NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X157153422240343449142519283244283346425456381721NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C61146382634364445222522232831304242354547302017NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679152412635345055152621253140343752495757361814NA1Dallas North No.2 C63/C679
Rockwall Heath C69139321421NVNV45721121919NV272544504345NV138NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X182154422237374155172521273340293553445153331718NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071148392529374452272622213238343750384754362523NA1Kaufman C71/A304/X071
Granbury C73/C68114741333134394518283330313432NVNANV4442301920NA1Granbury C73/C681
Eagle Mountain Lake C75 158482539353646132723273639343652364648331722NA1Eagle Mountain Lake C75
Parker County C761494534323543412028313131334537473542NVNV2022NA1Parker County C76
Cleburne Airport C77/C682150403437364150253130293134314841354950312322NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 352412432NV4749172522243236344053414950311717NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402150423037415053252926263338NANV52414954352223NA1Dallas Executive Airport C402
Greenville C1006/A198144342528334141122319282628343347514745331514NA1Greenville C1006/A198
Pilot Point C1032154402738374143172623302938293446526569432024NA1Pilot Point C1032
Italy C1044/A323141322129323743232627202127223033314445301718NA1Italy C1044/A323
Corsicana Airport C10511453630NANV4352332733252732294244394757382725NA1Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644238292723414744312417182430383756514941391716NA2Longview C19/A127/C644
Tyler Airport Relocated C82148402624395047292216223438314055464948341920NA1Tyler Airport Relocated C82
Karnack C85/AFHP303132282026NV374129201718NV24293644485837421513NA1Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151/G125246434749484738476664626255474043413738163744NA2El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X159143394347474434406552515646403735342931123437NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 147454951424837447057586351403539373133123441NA1Chamizal C41/AH126
Socorro Hueco C49/F312139384345413531354944424840353230272130NV3035NA1Socorro Hueco C49/F312
Skyline Park C72147474953554941477156656456454140403541213943NA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N42464343403237363536363738323027243036313443NA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414/F514146444755494439426851526050403836342836183640NA1Ivanhoe C414/F514
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Waco
Waco Mazanec C103714637303537NV40292937252930283545384847302222NA1Waco Mazanec C1037
Temple Georgia C1045146393235403641252737303027253436NVNANANANANANA1Temple Georgia C1045
Killeen Skylark Field C10471484136383841402625373033NVNV3637335043332624NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 236241926294329212720151822224635515554381417NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141235252526323839293223201724284738525861331517NA2West Orange C9/A141
Port Arthur West C28/A128/A2281302722NV45352324262622NV26264333585247341816NA1Port Arthur West C28/A128/A228
Hamshire C64/C654133272531473525262827222224234734365641341518NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N29262327493223252727242426264444646250381918NA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654130252429352822272924222224264237646339372018NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N3425252528473711727181924263935404750351618NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643131272326413927252727212024274838595550381919NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1NANANANANV3626222322161721224333525146351513NA1Nederland High School C1035
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Austin
Austin Northwest C3/A322246342830334127232224263029222528343033211620NA2Austin Northwest C3/A322
Audubon C38147362620364031191822263030232528323236231618NA1Audubon C38
Fayette County C6012 N44242233413423182625283330302727333430261923NA2Fayette County C601
Dripping Springs School C6141 N44333028354236232427313233252527382936281922NA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N45312830364032272322293128252829332833241822NA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N4436303436403322NVNV273130272731354345252221NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N44363128374129222825293030252726352934252222NA1Gorzycki Middle School C1603
Lockhart C16041 N4231302728343028192024128142224332630221923NA1Lockhart C1604
St. Edwards University C16051 N43322728353827252224242727212426342630211721NA1St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N42333131333425262020282928262426342530242120NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N40313033343934262028292628242728423332221921NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316234141120252919231813112115633536270451946NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 237241829424531312617243026184265617971331617NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 331221723373521253021202422163468567948311215NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X154236251935484431252318264129194341415158382018NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391332421263832212326272529NV233740888948371919NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45129252224322720212225262624233634867742372122NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 153251830393124242120233125173540555536281714NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A3211352523303348373426222530NANANANANANANV402418NA1Conroe Relocated C78/A321
Manvel Croix Park C84135221827302721232224232925213031464734NVNANANA1Manvel Croix Park C84
Clinton C403/C304/AH113 3432220NV322921242013202723173341656541291314NA3Clinton C403/C304/AH113
Houston North Wayside C4051311713NV322621NVNANANV231510315248655019710NA1Houston North Wayside C405
Houston Monroe C406131191825312719202119212521183027544831241413NA1Houston Monroe C406
Lang C408239231325403621252115172722133744546240301613NA2Lang C408
Houston Croquet C409241221828332821222419222925183034524834251815NA2Houston Croquet C409
Houston Westhollow C410155261933443324232420243125NV3140485137302117NA1Houston Westhollow C410
Park Place C416141211728373123252419222823173333636238291514NA1Park Place C416
Baytown Wetlands Center C5521 N13101081513891281010111215224039211687NA1Baytown Wetlands Center C552
Crosby Library C5531 N322119243638293226212224201425392631181387NA1Crosby Library C553
La Porte Sylvan Beach C5561 N131091011128811101110101113154032171610NVNA1La Porte Sylvan Beach C556
Tom Bass C5581 N2512717242013161091019148221936372218129NA1Tom Bass C558
Katy Park C5591 N392192332261612131618242114202227302825147NA1Katy Park C559
Atascocita C5601 N17129132125181811111316NANANANANANANANANANANA1Atascocita C560
Meyer Park C5611 N22159142729181811101219169252625413721119NA1Meyer Park C561
Bunker Hill Village C5621 N361392126231818141113211992431374130221310NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N17121115182422201514131416111924243226171013NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N38191827383422252521203023193671637755301014NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N36292328473926313830273027244073597645362022NA1Wallisville Road C617
Danciger C618 1 N37161320242015191922212325212228353725181713NA1Danciger C618
Texas City 34th St. C620 1 N34262629352820252830303031274038787141362220NA1Texas City 34th St. C620
UH Moody Tower C6951 N512519314435262827NV263224173638696842331918NA1UH Moody Tower C695
UH WG Jones Forest C6981 N35NV20283751353124222529NV20344242657742NV18NA1UH WG Jones Forest C698
UH West Liberty C6991 N29201725293933342624212426183440425141291320NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 133262025373320252727262724233474588049331617NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 136202127292519242124242729243033293834221819NA1Lake Jackson C1016
Baytown Garth C1017132262125433724293426262826223869557443301921NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X183133292829342721292827293032273532445338352219NA1Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N31302528353324293328283029273735849341371922NA1UH Smith Point C1606
Oyster Creek C1607 1 N33242629312919262330293132282831394333291918NA1Oyster Creek C1607
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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San Antonio
San Antonio Northwest C232484235354132NVNANA23303626272525332728242022NA2San Antonio Northwest C23
Camp Bullis C58 145414531373433192726323427282526383031262122NA1Camp Bullis C58
Calaveras Lake C59145362827332730273123333232262425302125241725NA1Calaveras Lake C59
Elm Creek Elementary C5011 N38393028372929203423333229262424272225221723NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N42353526312829172721272825252425383131241920NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N4337332432303316222227282324232435293123NVNANA1Bulverde Elementary C503
New Braunfels Airport C5041 N40313030293130272522312827252425372430242022NA1New Braunfels Airport C504
City of Garden Ridge C5051 N413629283426312122193228252423233423NVNANANANA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N40312930323130252319292724232425352429242120NA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N40332724282325243121292828222121271721181321NA1Heritage Middle School C622
CPS Pecan Valley C6781 N4137302634262922281130302624212027NVNANANANANA1CPS Pecan Valley C678
Government Canyon C16101 N47382933392725152620273426262222241720161315NA1Government Canyon C1610
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4226182125292616182129283232262626161626211732NA2Corpus Christi West C4
Corpus Christi Tuloso C21125182122242415171725242827232323161619161629NA1Corpus Christi Tuloso C21
Victoria C871412622313325192122313032NV243133312529162129NA1Victoria C87
Holly Road C6601 N30252932343022242734333536313231212134282338NA1Holly Road C660
Violet C6641 N23212024282419182028283332262726201819181731NA1Violet C664
Ingleside C6851 N24172224262714162027252930282726161424191630NA1Ingleside C685
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143128252425272326232220NV2525242631181919161728NA1Mission C43/AP143
Harlingen Teege C1023123232525232220221920282925232533191620181828NA1Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244132362930292733322727323333352925172519192329NA1Laredo Vidaurri C44/AFGP144/P244
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.