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Peak Daily One-Hour Ozone Averages for April 2017

The table below lists the peak daily one-hour ozone concentrations measured in April 2017 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 SitePOCApril 2017POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 249456153456062524537544541454132424744433840555952342Ft. Worth Northwest C13/AH302
Keller C17252466353456167544737544842494633444944464140566253322Keller C17
Frisco C31/C680153446259466166594939464844534334435147504337506452311Frisco C31/C680
Midlothian OFW C52/A137155525768496065574838505145474335444948474642616053321Midlothian OFW C52/A137
Denton Airport South C56/A163/X157156485754455968554537485442494234415746523939546554311Denton Airport South C56/A163/X157
Arlington Municipal Airport C61149456062455960504434534536434028383838383838535346301Arlington Municipal Airport C61
Dallas North No.2 C63/C679154467465445967564939464542493832334841444036525748311Dallas North No.2 C63/C679
Rockwall Heath C69153437358435864504740354440513733364238383237506148301Rockwall Heath C69
Grapevine Fairway C70/A301/X182151456354435962544737494536454131394844454038545951301Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071149445653476061524940334640493836443840363234536047281Kaufman C71/A304/X071
Granbury C73/C681147445559475564524439665045433929454648434343546455381Granbury C73/C681
Eagle Mountain Lake C75 157445357475968574640535250494534415446484042556355341Eagle Mountain Lake C75
Parker County C76148415154455357534245535039443630444545443841526454361Parker County C76
Cleburne Airport C77/C682153486164495871584938615643463933464948464644606658411Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 351477465476373615241544737494034335043464241586048313Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402148446061436262524636474538433930373930353635505145281Dallas Executive Airport C402
Greenville C1006/A198157376855495663525046344641524036444240393238536052321Greenville C1006/A198
Pilot Point C1032151435857455568564738494946564337426150564338516856321Pilot Point C1032
Italy C1044/A323153485260495864514636474539443630383936343437605747331Italy C1044/A323
Corsicana Airport C1051151445256475762545041434941533934423643383435566148341Corsicana Airport C1051
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644254305256485365705646404643513735443533334339535855402Longview C19/A127/C644
Tyler Airport Relocated C82157395472505360616143NA454152373645383235344050NA54391Tyler Airport Relocated C82
Karnack C85/AFHP303156315262475271615847434149543934453233344137466148391Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151255585161655851455462565470545457595346556447575853622El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159154554958645647425164524959515155575042616145525455571Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 153565159615052485864536062575761635750617046556358671Chamizal C41/AH126
Socorro Hueco C49/F312152524854595051415065484949565056585643496244495352591Socorro Hueco C49/F312
Skyline Park C72156565361665751455563545365555455585351636354535654631Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N54586061565262554953404848484953596054566663486164583BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414154565260615149435064484952535050555044566052465351591Ivanhoe C414
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Waco
Waco Mazanec C1037157485059485964534742414749463732453937363740595747381Waco Mazanec C1037
Temple Georgia C1045149495468506273595039525146464137464944414542596450551Temple Georgia C1045
Killeen Skylark Field C1047146475470486177574839495043484238454848494841547358581Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 251437562525377666051514455513935322932322937447048352Beaumont-Downtown C2/A112/C2002
West Orange C9/A141257476454455070635845433748473832313532302939377350342West Orange C9/A141
Port Arthur West C28/A128/A228157437560515467676354524249504136333333313043437349361Port Arthur West C28/A128/A228
Hamshire C64/C654156447154514972625846464248493936343532333044447648341Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C1654157427065495665716451463849514238353636343135456055381SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C643157477558525566666152514148494037333334333143447649381SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 156457759495470676151514148493937333233333041436849361Nederland High School C1035
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Austin
Austin Northwest C3/A322242465258485967514535414738453835434542394036506249602Austin Northwest C3/A322
Audubon C38142425161476569524434384940453835424543434336516649591Audubon C38
Fayette County C6012 N48456059505664585042455751423938424244332941536546632Fayette County C601
Dripping Springs School C6141 N41435066485469514535395241423835445044414739526148591Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N34395548394555413629293836363330363235313433475643511CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N45455265486674554839435042484239424345494638527154601CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N36395252425060453929334535373231384336353534465367521Gorzycki Middle School C1603
Lockhart C16041 N44456763515871574734354543434039434342414039616342611Lockhart C1604
St. Edwards University C16051 N37405551434859463831324234393431404130373334465441541St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N42436758465569534433384742423736454943413938516443601CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N4348606048586651453645NANANANANA474341373938536347561CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316252386257445381615743454051554138394139373230457646482Houston East C1/G316
Houston Aldine C8/AF108/X150 254436461535377615941454558584640464441463631487947472Houston Aldine C8/AF108/X150
Channelview C15/AH115 349386051505185585443463546484238394036363031447844493Channelview C15/AH115
Northwest Harris Co. C26/A110/X154255385961485473576144425066614638515043423435497644502Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239151385954485379585443463949503937364040342831437243471Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45157386155506082635748514251534140364441372938467645381Seabrook Friendship Park C45
Houston Bayland Park C53/A146 147416059486467595343444553503836384438372933455943531Houston Bayland Park C53/A146
Conroe Relocated C78/A321154456276485595656548454655575948484752654535499753481Conroe Relocated C78/A321
Manvel Croix Park C84148356257537267636046474556504041394541383341526547601Manvel Croix Park C84
Clinton C403/C304/AH113 350345150475572585541443953743836343834353033496448473Clinton C403/C304/AH113
Houston North Wayside C405151385354455278575439453853534138393938393030457040441Houston North Wayside C405
Houston Monroe C406144335245445258534739423342453032283329292733445343491Houston Monroe C406
Lang C408248425855455770555242444554523835354036372931436846522Lang C408
Houston Croquet C409245405857486564595342434351463737374237372934455543532Houston Croquet C409
Houston Westhollow C410145426055455662565141425054464036394239353033476744511Houston Westhollow C410
Park Place C416147365252445564565242443948NANANA474832352931435840461Park Place C416
Sheldon C5511 N37294339383955424034342936363329312829322829365335371Sheldon C551
Baytown Wetlands Center C5521 N36223834383836NANANANANANANANANANA2324252024376639331Baytown Wetlands Center C552
Crosby Library C5531 N3918574844446743432120NANANA48494345404536344911048541Crosby Library C553
West Houston C5541 N48426058485569565343435958514237404542393235507141531West Houston C554
La Porte Sylvan Beach C5561 N28223027273028NANANANANANANANANANA64549111912101La Porte Sylvan Beach C556
Mercer Arboretum C5571 N40354646394156454338403544424036374040423535395539441Mercer Arboretum C557
Tom Bass C5581 N42315147455858555140413646423433313834302733425740461Tom Bass C558
Katy Park C5591 N41375445424855514837374945363130363533272432465437451Katy Park C559
Atascocita C5601 NNANANANA202040272517171522232018181516181310183518191Atascocita C560
Meyer Park C5611 N40264945364158444131303446443227363227322625315830371Meyer Park C561
Huffman Wolf Road C5631 N29262630283347263131302930292928282728252727276031281Huffman Wolf Road C563
Clear Brook High School C5701 N48345752496069605542473849533736353837322839496144421Clear Brook High School C570
Clear Creek High School C5711 N41305645515767555237413341NANANA303225292438503338301Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N53356255525684605642424055544034404139363233467944471HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N51426661515389605645493947494341383537423236439147451Wallisville Road C617
Danciger C618 1 N45315850496555575140454446403435323635292735515741571Danciger C618
Texas City 34th St. C620 1 N59405455556279656153534254574241394645373244547256411Texas City 34th St. C620
UH Moody Tower C6951 N51426256496168625745464052564038384236372733476748521UH Moody Tower C695
U of H-Sugarland C6961 N49436356506463595543485154474338394542363436506147581U of H-Sugarland C696
UH Coastal Center C6971 N55365351526563645949534452513938354241342945566150381UH Coastal Center C697
UH WG Jones Forest C6981 N57456371535990646447444458625547525551644235499751511UH WG Jones Forest C698
UH West Liberty C6991 N473963615050996258444141484543393538334433284210145461UH West Liberty C699
Lake Jackson C1016 154346152526363646046504051494039364241342934505754391Lake Jackson C1016
Baytown Garth C1017153446963535490625748534353534643404539453538449048471Baytown Garth C1017
Galveston 99th St. C1034/A320/X183161385957586477706758575154614545385152393344597255421Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N46294851415557575742504150514038384244342934505755341Oyster Creek C1607
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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San Antonio
San Antonio Northwest C23242455661516567524538385645453739455760433838536453642San Antonio Northwest C23
Camp Bullis C58 140445661486468514438345145443637495562454039516757631Camp Bullis C58
Calaveras Lake C59135455650466162504133384441403535464847383635525945621Calaveras Lake C59
Elm Creek Elementary C5011 N43466166526567544739425245454040566554474143586553711Elm Creek Elementary C501
Fair Oaks Ranch C5021 N41425359496568504438355246463738474862463940516655611Fair Oaks Ranch C502
Bulverde Elementary C5031 N41435259475967504238344943443636394852454238486757571Bulverde Elementary C503
New Braunfels Airport C5041 N39456759475671534533454642413736434543423939516545641New Braunfels Airport C504
City of Garden Ridge C5051 N38445860485764504233344843413735435346394138516046631City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N36426153425065494031354640383332393939383534455942581Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N37NANANANANANANANANA364843453838465050434138576349681Heritage Middle School C622
CPS Pecan Valley C6781 N2431413734444534302220NA25262222263127211929394534491CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4246476050515356554739494641383638534752292534545645552Corpus Christi West C4
Corpus Christi Tuloso C21145495952525758574435464041383539574754312737565946531Corpus Christi Tuloso C21
Victoria C87145505854525563575038474743433940454649312738536445591Victoria C87
Inez C6091 NNANANANANANANANANANANANANA373738414644292637536039581Inez C609
Holly Road C6601 NNANANANANANA64645545575149434245605756322842616454621Holly Road C660
Violet C6641 N39445445475453514133464038333134464548252233525141481Violet C664
Ingleside C6851 N48426254475559595342504443393840504752322538525853481Ingleside C685
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143135466443455052463932444039373235405250373140494941451Mission C43/AP143
Brownsville C80/AGP180137386242525554524335484639373440365349302726525340521Brownsville C80/AGP180
Harlingen Teege C1023139456143515554544335454043424043436060373439586741531Harlingen Teege C1023
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244142435358444650423936373338363235434950413834484753481Laredo 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

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.