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Daily Maximum Eight-Hour Ozone Averages for September 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 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.) 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 2017POCMonitoring Site
12345678910111213141516171819202122
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2726056545145545060525658736050384657343229182Ft. Worth Northwest C13/AH302
Keller C172746962605045635961526059816858455265403633222Keller C17
Frisco C31/C6801627766674639504947485450676959455372403434221Frisco C31/C680
Midlothian OFW C52/A1371705253526245454447506262665444384342312929241Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571606962614438595749465455677260465472413033191Denton Airport South C56/A163/X157
Arlington Municipal Airport C611795857555542474754515860785947394555312928221Arlington Municipal Airport C61
Dallas North No.2 C63/C6791817160635240515348485752816556414868363132221Dallas North No.2 C63/C679
Rockwall Heath C691696455604837434647485250675852444453292829211Rockwall Heath C69
Grapevine Fairway C70/A301/X1821677060594640565452485456736455435171363131221Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071155615757554148515053545574625248464430NVNANA1Kaufman C71/A304/X071
Granbury C73/C6811574852474946494854575556595849393944303030181Granbury C73/C681
Eagle Mountain Lake C75 1625957544743625859505559636656414862363435211Eagle Mountain Lake C75
Parker County C761535153514745555265525457625749384449312931181Parker County C76
Cleburne Airport C77/C682169565858615755555862737174635244464637NVNANA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3825652514739484848485548754844353956191823163Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021NANANV52NANANANV474756NANV5647384140NV2628211Dallas Executive Airport C402
Greenville C1006/A1981505552544337424443455147525747424045292826211Greenville C1006/A198
Pilot Point C10321536863644138494845445249577362485159433637191Pilot Point C1032
Italy C1044/A3231625655575951494950526671NANV45384532262428211Italy C1044/A323
Corsicana Airport C105116160626354454848535458736465NANANANANANV33231Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Tyler-Longview-Marshall
Longview C19/A127/C6442575249465142575144455150586348414530222528152Longview C19/A127/C644
Tyler Airport Relocated C82153554751494256564547535264574137443525NV26231Tyler Airport Relocated C82
Karnack C85/AFHP3031456744484740434042445241567053434246262828171Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
El Paso-Juarez
El Paso UTEP C12/A125/X1512525258575260645753545572474437385041383435102El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591464656515154595149505078474335395040NV3033131Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1454757524655615147515282504739405043413737111Chamizal C41/AH126
Socorro Hueco C49/F3121444252454649484644444465514335403941353135101Socorro Hueco C49/F312
Skyline Park C721535158545160755853515279494739415443414039161Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N494845494246525656535159555450494839434443283BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141384047434146534339413367413731344035312930111Ivanhoe C414
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Waco
Waco Mazanec C10371665856584754485253526969715444384732262627241Waco Mazanec C1037
Temple Georgia C10451666061585162545157606858805847454943312828251Temple Georgia C1045
Killeen Skylark Field C10471595758574856535054576261696453484745333733241Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2NANV58453635484541454549745142382620221927202Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412NANV544541325044414242477252NV4421212722NV202West Orange C9/A141
Port Arthur West C28/A128/A2281NANANANANANV564845454353795141392425262735261Port Arthur West C28/A128/A228
Hamshire C64/C6541NANANANANANANANV404346NV785138382321232532221Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541607248453438475248454864705140362326283239321SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C6431NANV50424136544541444551NV2433312020201925161SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1NANV53434035564640454753805643412725262535211Nederland High School C1035
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Austin
Austin Northwest C3/A3222715859464950515248555861645449413839262523222Austin Northwest C3/A322
Audubon C381625458484653515148555358675550414140282927231Audubon C38
Fayette County C6012 N605050443945465145515964625141343721222221192Fayette County C601
Dripping Springs School C6141 N565353434752545450545261665550434140232725231Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N444041333540373939465055504739322924222120151CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N625959544654475051555458736256474247323331261CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N595053394446494742484853574643353432232623241Gorzycki Middle School C1603
Lockhart C16041 N67575842455250525154NV7360NV47413733302624261Lockhart C1604
St. Edwards University C16051 N645053374445464544505456544540343231222119NA1St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N615256373948474645515759575144373631262522201CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N605656454648474647545861635244383741252321211CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Houston-Galveston-Brazoria
Houston Aldine C8/AF108/X150 2NV6462685738434842534969717358665822342518202Houston Aldine C8/AF108/X150
Channelview C15/AH115 3NV60595245343745374646656557375846NV231916163Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542605862744740455045505165NVNV59565324312725182Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391567459555635505646474776645842514022272124261Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451NANANANV593655564348478961544041302125NV33281Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1956669576340496549555468656040443821241920241Houston Bayland Park C53/A146
Conroe Relocated C78/A3211485452594740444241505165668265505330423826251Conroe Relocated C78/A321
Manvel Croix Park C841725961525943636965606072616040363622292123231Manvel Croix Park C84
Clinton C403/C304/AH113 3787778675939485847555270556038585218241819303Clinton C403/C304/AH113
Houston North Wayside C405153666363493438423749435859594856541525187101Houston North Wayside C405
Houston Monroe C4061NANANANANVNV485544464266595036403219241819181Houston Monroe C406
Lang C4082706369645633414942464258585940554919231915162Lang C408
Houston Croquet C4092NANANV515939526747525163595537373521231720202Houston Croquet C409
Houston Westhollow C4101NANANANANV39506151515061595636414220241917221Houston Westhollow C410
Park Place C4161777266576734486044504766615841513922282119221Park Place C416
Sheldon C5511 N3235343230273133303434404038313530NVNANANANA1Sheldon C551
Baytown Wetlands Center C5521 N333531292525363832383855514025301810131110101Baytown Wetlands Center C552
Crosby Library C5531 N475552504537444439505160736944604123322620241Crosby Library C553
La Porte Sylvan Beach C5561 N536252475034515139474779605438382719242231311La Porte Sylvan Beach C556
Tom Bass C5581 N644949385226455945444058494934332917231616131Tom Bass C558
Katy Park C5591 N604453453534435142424353514731312716181515171Katy Park C559
Atascocita C5601 N42565454443340443755476372765563481422169141Atascocita C560
Meyer Park C5611 NNANANANANVNVNANANANANANANANANANANANANANANANA1Meyer Park C561
Clear Brook High School C5701 N64645948713752574852507759543743NANV2419NVNA1Clear Brook High School C570
Clear Creek High School C5711 N536151455735495042474882584934423014181720151Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N667270625434445342494567616146605724272218211HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N505856484336425040484865706039623419272119151Wallisville Road C617
Danciger C618 1 N404344382946475052575256504124252815161719121Danciger C618
Texas City 34th St. C620 1 N68695952584458605252548765NV44463427303442431Texas City 34th St. C620
UH Moody Tower C6951 NNV747159583746NVNV51496765NVNA503723282120NA1UH Moody Tower C695
U of H-Sugarland C6961 N655954525244618258585363635735NA3821242123181U of H-Sugarland C696
UH Coastal Center C6971 N685955406035515246465283595235343020242732NA1UH Coastal Center C697
UH WG Jones Forest C6981 NNANANANA5141444443495365658566565727403322NA1UH WG Jones Forest C698
UH West Liberty C6991 NNV464742NVNV373935434653715739443021312624NA1UH West Liberty C699
Lake Jackson C1016 1NANANANANANANANV53565958584932303019232125221Lake Jackson C1016
Baytown Garth C10171NV60565040374250404848667363436437243125NV201Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831NANV4942NV344654504447835751363125NANVNANANA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 NNANANANANANANANANANANANANANV36322720242633331Oyster Creek C1607
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
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San Antonio
San Antonio Northwest C232NANANANANANANANANANANV58665451463934262826212San Antonio Northwest C23
Camp Bullis C58 1665163514350566254545261755958494341283128231Camp Bullis C58
Calaveras Lake C591504355384449505849515668575046383526232524201Calaveras Lake C59
Elm Creek Elementary C5011 N594654374456596262625663565247403426242524211Elm Creek Elementary C501
Fair Oaks Ranch C5021 N605459483948525350494855725957474038283028201Fair Oaks Ranch C502
Bulverde Elementary C5031 N595657483948535150514957745653474240283127221Bulverde Elementary C503
New Braunfels Airport C5041 N585456384047484846505760575346383530252524211New Braunfels Airport C504
City of Garden Ridge C5051 N655359414353555554585364665550423833242524211City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N595356373945515246485759505144373628252524221Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N473949304245465244464963504641332922192020171Heritage Middle School C622
CPS Pecan Valley C6781 N524350364547485046504760614742373329232321171CPS Pecan Valley C678
Government Canyon C16101 N6648563942465463484848NVNANANANANANANANANANA1Government Canyon C1610
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Corpus Christi-Victoria
Corpus Christi West C423237433031474953565449645245392927NVNANANANA2Corpus Christi West C4
Corpus Christi Tuloso C2113842472930455154575148645144393033NV181823231Corpus Christi Tuloso C21
Victoria C871485051352840605848485268NV4937363415222122241Victoria C87
Inez C6091 N435248332941575552505267604834343220222121211Inez C609
Holly Road C6601 NNANANANANANANANANANANANV464031221812111122211Holly Road C660
Violet C6641 NNANANANANANANANANANANANANANANA322919NVNANANA1Violet C664
Ingleside C6851 NNANANANANANANANANANANANV534036232016161624191Ingleside C685
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Lower Rio Grande Valley
Mission C43/AP1431283429262847463850484453504233272417161821221Mission C43/AP143
Brownsville C80/AGP1801182822212243403451494860454231211916161722241Brownsville C80/AGP180
Harlingen Teege C10231253427232649474054525061544942292521212124261Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122
Laredo
Laredo Vidaurri C44/AFGP144/P2441NV29261929414853494850594741342723171818NVNA1Laredo 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

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.