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Peak Daily One-Hour Ozone Averages for April 2015

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 237424653333940303848463440305449386858492Ft. Worth Northwest C13/AH302
Keller C17237414251313938283548483438275852376349452Keller C17
Frisco C31/C680137474147344241334342503843287157496257461Frisco C31/C680
Midlothian OFW C52/A137135414644314039283742443239284853355055521Midlothian OFW C52/A137
Denton Airport South C56/A163/X157139464751344441314249584145296959415858481Denton Airport South C56/A163/X157
Arlington Municipal Airport C6113340434732363726384042313728485134NA55491Arlington Municipal Airport C61
Dallas North No.2 C63/C679132444046303939304340513538296749446256461Dallas North No.2 C63/C679
Rockwall Heath C69138404648343839314845513741327052465459481Rockwall Heath C69
Grapevine Fairway C70/A301/X182136434550294039314148513640286254416756491Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071137374545323436313838483234305144445056451Kaufman C71/A304/X071
Granbury C73/C681146464856403942313851363543334748425261551Granbury C73/C681
Eagle Mountain Lake C75 135404451313739254044473440285350335154441Eagle Mountain Lake C75
Parker County C76144464958423742305055383644335151435561521Parker County C76
Cleburne Airport C77/C682139465049384344293642403341314849425056551Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 333434348293838284442473338286150406258503Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402129374143283435264138403034285045334752471Dallas Executive Airport C402
Greenville C1006/A1981393745433035373240424631382656NA485455471Greenville C1006/A198
Pilot Point C1032139464245344241334247493945316557455658501Pilot Point C1032
Italy C1044/A323135394946333739284143453040285249415155561Italy C1044/A323
Corsicana Airport C1051135355048323337293935442939304649415352461Corsicana Airport C1051
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644244454343363750413937522732202952675755472Longview C19/A127/C644
Tyler Airport Relocated C82139394551364540393536573038234450575458461Tyler Airport Relocated C82
Karnack C85/AFHP303144484240343548363533483127224050424147451Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151249486645504643525347444249625362616060692El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159145436141433838365240393945524661575455531Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 150496239504744495742454347555464626259661Chamizal C41/AH126
Socorro Hueco C49/F312152496142554441445642424348545256586160621Socorro Hueco C49/F312
Skyline Park C72150496245505047565647444848615465666259711Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N52485341443635374540374953445154536464583BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414150485840474643515741454147515260595958651Ivanhoe C414
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Waco
Waco Mazanec C1037134385045313739273538352843315149454755541Waco Mazanec C1037
Temple Georgia C1045143475150354147314545313049375246484957571Temple Georgia C1045
Killeen Skylark Field C1047147475249394650324352273349406347444760551Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 241443239323430312731432965516047483661512Beaumont-Downtown C2/A112/C2002
West Orange C9/A141234413436323027312727362957436043433353422West Orange C9/A141
Port Arthur West C28/A128/A228140413239353328302534313157476347523654421Port Arthur West C28/A128/A228
Hamshire C64/C654139433242363330312834423061516548483665451Hamshire C64/C654
SETRPC Port Arthur C6281 N38413239383029312429322956506851523456461SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654132353137362729262023272235354535321930221SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N37463136292932342924423166475543473360461SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643137413137323023252125302551385440433048381SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 139423240313229312731463064496848503859471Nederland High School C1035
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Austin
Austin Northwest C3/A322243404844363942303840263552415744414657562Austin Northwest C3/A322
Audubon C38148444948374447324241223547415848424558571Audubon C38
Fayette County C6012 N36384841293535302931272944395042444846522Fayette County C601
Dripping Springs School C6141 N48404545313944324442223646475445385757561Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N41404847293940343341293453504945425357511CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N47464947334449314342243749407049474655561CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N53485754415052384848293962466050486668691Gorzycki Middle School C1603
Lockhart C16041 N42385043293938323539253153454740415255491Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N42404642294342354040263659424941415455571CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 NNANANANANANANANANANANANANA234544454657531CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316237423037293434333418323257487548474453412Houston East C1/G316
Houston Aldine C8/AF108/X150 236453840273739343319333660457651524557462Houston Aldine C8/AF108/X150
Channelview C15/AH115 335333034282626242618312552455248473751413Channelview C15/AH115
Northwest Harris Co. C26/A110/X154234393938263335322923363145336943554846422Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239136362734303027292716362948486641433744431Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45140392942393331302720393052526449533950451Seabrook Friendship Park C45
Houston Bayland Park C53/A146 132373337353026272616352749356743454145441Houston Bayland Park C53/A146
Conroe Relocated C78/A321141454440324649453724383952226361484847431Conroe Relocated C78/A321
Manvel Croix Park C84137422946353633343218313054557047484348541Manvel Croix Park C84
Clinton C403/C304/AH113 331342933202428262519322743377442433344443Clinton C403/C304/AH113
Houston North Wayside C405128363033222829252517312844396739403744411Houston North Wayside C405
Houston Monroe C4061NANANANANA2525232612262444466142413645411Houston Monroe C406
Lang C408233383538263432322819302851347144494349442Lang C408
Houston Croquet C4092343931393134293329153630524965NA404046482Houston Croquet C409
Houston Westhollow C410134383945343232303218342953367045474449511Houston Westhollow C410
Houston Texas Avenue C411131343134222726282715353046456440423644421Houston Texas Avenue C411
Park Place C416135402836323130303016363150497642443646421Park Place C416
Sheldon C5511 N30352933222931273119282651405140412944411Sheldon C551
Baytown Wetlands Center C5521 N25241925222120201714262232343430322234291Baytown Wetlands Center C552
Crosby Library C5531 N33382832233028292817252654404937372950381Crosby Library C553
West Houston C5541 N30353740242930232616252642316637534343431West Houston C554
La Porte Sylvan Beach C5561 N3938283836302629262134294550534646NANANA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N31373335233335302820273045226339403744371Mercer Arboretum C557
Tom Bass C5581 N31362438312928292715272542446439393440431Tom Bass C558
Katy Park C5591 N28303438272527242217262538315833424140411Katy Park C559
Atascocita C5601 N31373132253234312917272749335339403344351Atascocita C560
Meyer Park C5611 N27363233233133292916282741265935454041391Meyer Park C561
Bunker Hill Village C5621 N30432838273030252616302744295838423741441Bunker Hill Village C562
Huffman Wolf Road C5631 N37403638263530313115272757394938403554NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N35423538323633323519362956507348493854461HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N414232372736333630243832625154NANANANANA1Wallisville Road C617
Danciger C618 1 N39413050313131303121272853486542444342591Danciger C618
Mustang Bayou C619 1 N42433145353533322829323050556348514050571Mustang Bayou C619
Texas City 34th St. C620 1 N42433144393530342633352951546254544057481Texas City 34th St. C620
UH Moody Tower C6951 N37423023303433343015373255558146483949471UH Moody Tower C695
U of H-Sugarland C6961 N32353143322726262816402646355541433748471U of H-Sugarland C696
UH Coastal Center C6971 N33342537322626252021262439405143453444421UH Coastal Center C697
UH WG Jones Forest C6981 N39444441304446423624334248306851504749441UH WG Jones Forest C698
UH West Liberty C6991 N42504240314243433924363371534951524566511UH West Liberty C699
Lynchburg Ferry C1015/A165 137402932283330313020302849455447453543421Lynchburg Ferry C1015/A165
Lake Jackson C1016 13841284741332928262129264552NANA264045581Lake Jackson C1016
Baytown Garth C1017141423236283632362923373158475352523559461Baytown Garth C1017
Galveston 99th St. C1034/A320/X183144433450424137373136343251586955575263461Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C23243404645373640353943263644455442374453542San Antonio Northwest C23
Camp Bullis C58148444645373845384344213547436240374356541Camp Bullis C58
Calaveras Lake C59138374241263436323636243244445140373648481Calaveras Lake C59
Elm Creek Elementary C5011 N40374042303237333537223346404739343552471Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4644424136364335393922354425NANANANANANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N4444424131NA4034414023334337NANANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N41364540293840343738213354405139384153531New Braunfels Airport C504
City of Garden Ridge C5051 N47414546283739353938253251425741364258551City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N39364339274039333633233149394937374255461Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N38364141283536343738253347475141373852501Heritage Middle School C622
CPS Pecan Valley C6781 N37363738262935313230212941394534303246441CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4240373447403128302934323743585445394640472Corpus Christi West C4
Corpus Christi Tuloso C21136353344353228312932333643495146354539471Corpus Christi Tuloso C21
Victoria C87140374244413129282941253041395741455240461Victoria C87
Inez C6091 NNANANANANANANANANANANANANANANANA404741481Inez C609
Coleto C6241 NNANANANANANANANANANANANANA385438495245491Coleto C624
Aransas Pass C6591 N40383351433027302833322946585850414742501Aransas Pass C659
Holly Road C6601 N3574NANANA2423242530302938534935314030431Holly Road C660
Violet C6641 N33302839322924272425303642474840374535471Violet C664
Ingleside C6851 N37333145352724252627282441495138394340431Ingleside C685
Odem C6861 N35333141343026292630282943444838384238461Odem C686
Taft C6871 N3632293932252426233025254548494119NANANA1Taft C687
Cuero C16021 NNANANANANANANANA2728262648404937424353491Cuero C1602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143132323228303129302936334040434540274635521Mission C43/AP143
Brownsville C80/AGP180135322825272925272526274545524936234327591Brownsville C80/AGP180
Harlingen Teege C1023132322930283230292733274243515040294138581Harlingen Teege C1023
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244134364737292832333529253434383938263751441Laredo 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.