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Peak Daily One-Hour Ozone Averages for May 2015

The table below lists the peak daily one-hour ozone concentrations measured in May 2015 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 SitePOCMay 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2797060524841583844374145362828364359264332272842445756412Ft. Worth Northwest C13/AH302
Keller C172866854514939513533383642313027334467294029252640434852392Keller C17
Frisco C31/C6801768460595246594937453844354031365359315229333241445165421Frisco C31/C680
Midlothian OFW C52/A1371646751524538363331364634273233324140304927322936494953381Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571898165615148544736434248303832375576344734333648454966431Denton Airport South C56/A163/X157
Arlington Municipal Airport C611656452504535503030394841292732314143264427332533495054401Arlington Municipal Airport C61
Dallas North No.2 C63/C6791717554514741543933394038263626344760334727303037445161431Dallas North No.2 C63/C679
Rockwall Heath C691737461605147634638434042283730374846325430413139595562441Rockwall Heath C69
Grapevine Fairway C70/A301/X1821877258554739563830444343333127334568304930282939464856421Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711706856544242554736373533273525353938304523382934575354381Kaufman C71/A304/X071
Granbury C73/C6811747053535441524148414543383032434741383635222841515751451Granbury C73/C681
Eagle Mountain Lake C75 1866557514639503634364144342929344368294132262741444853411Eagle Mountain Lake C75
Parker County C761827156586043584346484752373235404867354537253249495352501Parker County C76
Cleburne Airport C77/C6821686649514935463737394935392928354439334631272737475253421Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3777053544638593632414344242724344352314728363036475160423Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40216663474941345227273540372329353039412744273227294828NANA1Dallas Executive Airport C402
Greenville C1006/A1981626561554442484631403538273429335041304726362635534456371Greenville C1006/A198
Pilot Point C10321688564615048534823NANA36314232375760325136343246484867451Pilot Point C1032
Italy C1044/A3231696753564840373533375235303425344137364529303036494850341Italy C1044/A323
Corsicana Airport C10511666756574243453734403832283425314138343525333235485250421Corsicana Airport C1051
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442796459664644333533314330323227314446344723443134354156442Longview C19/A127/C644
Tyler Airport Relocated C821656556644641333832334229333526373841264222462634574252361Tyler Airport Relocated C82
Karnack C85/AFHP3031606461705140355230254932313325283545334523463731533853471Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X1512605959565051555966637447564342585749536335596159585869592El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591575359454246494759576541533633525441486433485454526463511Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1615662515050545667647037564241605745566729576361595865601Chamizal C41/AH126
Socorro Hueco C49/F3121615667504853545561626846634238585648496733585958586264581Socorro Hueco C49/F312
Skyline Park C721626367585154556064627248584343575752587836636261595866581Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N615958465750553867685449525745486152594229453860696547453BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141605464484649515258575842554037495542517028545453536161541Ivanhoe C414
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Waco
Waco Mazanec C10371716953585143363435325133323226365141354329333137395151321Waco Mazanec C1037
Temple Georgia C10451777656775241352935344531363430374943353728433242353244311Temple Georgia C1045
Killeen Skylark Field C10471717558725044363036444429323627394937313932383038313945301Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2716962675451373130294635232924252431282230402637464957452Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412627258624943363026274138232725242833252333372632435065352West Orange C9/A141
Port Arthur West C28/A128/A2281736657615246373027274735283127252635272133412738335456381Port Arthur West C28/A128/A228
Hamshire C64/C6541657358675347383127304840232926263336272333402636515450331Hamshire C64/C654
SETRPC Port Arthur C6281 N757261645143363129284532253027252636262438402842515749391SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541637156604843373128264128282724382831252237412838485545331SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N636861675146343227264130232824242533293732522935464966491SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431645948554541342623223931222422222229231927322432464653351SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1717160645349393129284743283126272837282435423040535669471Nederland High School C1035
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Austin
Austin Northwest C3/A3222817653504739342732294529333129334937314237353039333242282Austin Northwest C3/A322
Audubon C381798056535040363234314330373328354642324330293140323135291Audubon C38
Fayette County C6012 N766657654840333532323829273126313840273128433940493843372Fayette County C601
Dripping Springs School C6141 N757655505141353739334636383533406240343747343545363831351Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N7373595750423464NA374228383931394940364336403841403037271CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N847858564745373436333730353829384944334440342939313837301CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N787956524941343334314631393431364937313543353246343036281Gorzycki Middle School C1603
Lockhart C16041 N74685552474134403431402932333435503631403836434835NA30321Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N737552484541323935314331353734354836323544363743313230301CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N767454564539333134303727373628335634293444413438373045291CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162868864735149342930294329303225263124322822382938535864442Houston East C1/G316
Houston Aldine C8/AF108/X150 2838769795148363032304427293628253127303829442741515983562Houston Aldine C8/AF108/X150
Channelview C15/AH115 37311057615048302426263929253023242923252126362635515748393Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542677456774647383433323923273428293140313731532841475061442Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391906960654744302625254333283023233124272328342934495252341Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451848564675149343028274936293025303827272633373538575552391Seabrook Friendship Park C45
Houston Bayland Park C53/A146 18869586950NA28272627452930252022332023272938243652NANANA1Houston Bayland Park C53/A146
Conroe Relocated C78/A32117210172685149464741383931315136363146375435333649545586581Conroe Relocated C78/A321
Manvel Croix Park C841906860765351363029305338342924273824283032382743605952321Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANANANANANA2428274434282519253324262430372938NA4054393Clinton C403/C304/AH113
Houston North Wayside C4051717057644343292526253622242317212519272725332333434962431Houston North Wayside C405
Houston Monroe C4061796153634636322625254236302321233121242027352634525545261Houston Monroe C406
Lang C4082837658795049363131303928283127252927293728443039535455392Lang C408
Houston Croquet C4092866657704949342929304636322824263825293132392741565850322Houston Croquet C409
Houston Westhollow C4101776957735050343230324735303124273730283534443041555453341Houston Westhollow C410
Houston Texas Avenue C4111796652674543312626273729262321223322252628342734475249281Houston Texas Avenue C411
Park Place C4161877057705047342929294536322826263425292629383039545956311Park Place C416
Sheldon C5511 N61805458434027252626352422312223252324222535263230NA32471Sheldon C551
Baytown Wetlands Center C5521 NNANANANANANA333029304245303227283428282732402735475148321Baytown Wetlands Center C552
Crosby Library C5531 N638655634442312929252718202722212224212325392434384351311Crosby Library C553
West Houston C5541 N766956824849322929293631252820222926263030432537414453341West Houston C554
La Porte Sylvan Beach C5561 NNANANANANANANANANANANANANANANANANANANANANANANANANANANA401La Porte Sylvan Beach C556
Mercer Arboretum C5571 N628260634342333030303118253623232430273025372537404571531Mercer Arboretum C557
Tom Bass C5581 N755950604443292423234033272219212918212225312334484941241Tom Bass C558
Katy Park C5591 N646350714344302724374031193018193027232429412233434042261Katy Park C559
Atascocita C5601 N618055574342292928263522242926232424283225382836404664441Atascocita C560
Meyer Park C5611 N616852644339333029273319233025232428273424402235383955351Meyer Park C561
Bunker Hill Village C5621 N726351654344292625263826232419232520242727392131434343301Bunker Hill Village C562
Huffman Wolf Road C5631 N618156604338313028263220233026252224212925392041394449321Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N899067725049322726274536303224233023282530403341525959431HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N687052584845332928274138263027253125262627392635475146311Wallisville Road C617
Danciger C618 1 N726561624949332929304633322625284426262327352643495249281Danciger C618
Mustang Bayou C619 1 N716661655148343027284632302925283422252231363041475352371Mustang Bayou C619
Texas City 34th St. C620 1 N888770755850383433325537313428304228292734433944585857471Texas City 34th St. C620
UH Moody Tower C6951 N907358734946343130314437232927273926293031423040566056321UH Moody Tower C695
U of H-Sugarland C6961 N756455704748323127294938252720233726272732372536525743291U of H-Sugarland C696
UH Coastal Center C6971 N665754624844312323223824192119232718181926302528404436281UH Coastal Center C697
UH WG Jones Forest C6981 N7410070705048444038373628324835323045404332373446495778591UH WG Jones Forest C698
UH West Liberty C6991 N678364684946363434303931323432303531303334482742515766381UH West Liberty C699
Lynchburg Ferry C1015/A165 1799959654944302728264339293022252722262424352737425149351Lynchburg Ferry C1015/A165
Lake Jackson C1016 1686362614948342827294730262723293623242328342539364846371Lake Jackson C1016
Baytown Garth C10171808363705651383532314746273431293629303032453040545753361Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831927070705751383232305438303428303327262741423947546157511Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C232788457525241383640313838324040344841354243383939343431342San Antonio Northwest C23
Camp Bullis C581868759484644363441324837353841364846364543383539293732441Camp Bullis C58
Calaveras Lake C591767353484840323835323632344932324434323344353637302826291Calaveras Lake C59
Elm Creek Elementary C5011 N667452464538353536313430303539334135313341323235312926311Elm Creek Elementary C501
Fair Oaks Ranch C5021 N838357464443362940313835333542354545364343373238283830411Fair Oaks Ranch C502
Bulverde Elementary C5031 N8380574948433531403140373438393745453638463435403037NANA1Bulverde Elementary C503
New Braunfels Airport C5041 N717253504540344033283830314029344534293138313739293124281New Braunfels Airport C504
City of Garden Ridge C5051 N788157514842343936313835334033344435283348343642313025311City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N646753504439334133303327293628334333293242323238352727301Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N717355494942343737323632344633314235323441354135313027301Heritage Middle School C622
CPS Pecan Valley C6781 N656948434236293332293329274129313930293041303431272623251CPS Pecan Valley C678
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C427858585545403334NANANA24352434313333313033293245332929282Corpus Christi West C4
Corpus Christi Tuloso C211875858534640313431323440292431293131272730293343302626251Corpus Christi Tuloso C21
Victoria C871786259565242323029314738302333284629282827312842453840321Victoria C87
Inez C6091 N796660594743343030324840292334274326272729302742393537241Inez C609
Coleto C6241 N766059574843353736354743353139305030303231363146483938311Coleto C624
Aransas Pass C6591 N8261645650393229303140423528353031293031313NANANANANANA1Aransas Pass C659
Holly Road C6601 N715153504034283026253435291829252726252424222439262223241Holly Road C660
Violet C6641 N745350484034262827273136322031272728242225222736252019181Violet C664
Ingleside C6851 N705355494134292827283437332134292827282730252842312429301Ingleside C685
Odem C6861 N775755504237303028283037302230282629252529222738282424221Odem C686
Cuero C16021 N676354524639313232302935242632284326262836312843433236291Cuero C1602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431685243453733333337312738222328293129262832323338262726241Mission C43/AP143
Brownsville C80/AGP1801555148504036313531302629212224313331293129302738262424251Brownsville C80/AGP180
Harlingen Teege C10231585747493737343331302531242729293332282830322836272725251Harlingen Teege C1023
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441555438363430333740312730212627313234323236323233312724271Laredo 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 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 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 beginning 1/1/2013, 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.