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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
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 237424653333940303848463440305449382Ft. Worth Northwest C13/AH302
Keller C17237414251313938283548483438275852372Keller C17
Frisco C31/C680137474147344241334342503843287157491Frisco C31/C680
Midlothian OFW C52/A137135414644314039283742443239284853351Midlothian OFW C52/A137
Denton Airport South C56/A163/X157139464751344441314249584145296959411Denton Airport South C56/A163/X157
Arlington Municipal Airport C61133404347323637263840423137284851341Arlington Municipal Airport C61
Dallas North No.2 C63/C679132444046303939304340513538296749441Dallas North No.2 C63/C679
Rockwall Heath C69138404648343839314845513741327052461Rockwall Heath C69
Grapevine Fairway C70/A301/X182136434550294039314148513640286254411Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071137374545323436313838483234305144441Kaufman C71/A304/X071
Granbury C73/C681146464856403942313851363543334748421Granbury C73/C681
Eagle Mountain Lake C75 135404451313739254044473440285350331Eagle Mountain Lake C75
Parker County C76144464958423742305055383644335151431Parker County C76
Cleburne Airport C77/C682139465049384344293642403341314849421Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 333434348293838284442473338286150403Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402129374143283435264138403034285045331Dallas Executive Airport C402
Greenville C1006/A1981393745433035373240424631382656NA481Greenville C1006/A198
Pilot Point C1032139464245344241334247493945316557451Pilot Point C1032
Italy C1044/A323135394946333739284143453040285249411Italy C1044/A323
Corsicana Airport C1051135355048323337293935442939304649411Corsicana Airport C1051
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Longview C19/A127/C644244454343363750413937522732202952672Longview C19/A127/C644
Tyler Airport Relocated C82139394551364540393536573038234450571Tyler Airport Relocated C82
Karnack C85/AFHP303144484240343548363533483127224050421Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2015POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151249486645504643525347444249625362612El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159145436141433838365240393945524661571Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 150496239504744495742454347555464621Chamizal C41/AH126
Socorro Hueco C49/F312152496142554441445642424348545256581Socorro Hueco C49/F312
Skyline Park C72150496245505047565647444848615465661Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N52485341443635374540374953445154533BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414150485840474643515741454147515260591Ivanhoe C414
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Waco Mazanec C1037134385045313739273538352843315149451Waco Mazanec C1037
Temple Georgia C1045143475150354147314545313049375246481Temple Georgia C1045
Killeen Skylark Field C1047147475249394650324352273349406347441Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 241443239323430312731432965516047482Beaumont-Downtown C2/A112/C2002
West Orange C9/A141234413436323027312727362957436043432West Orange C9/A141
Port Arthur West C28/A128/A228140413239353328302534313157476347521Port Arthur West C28/A128/A228
Hamshire C64/C654139433242363330312834423061516548481Hamshire C64/C654
SETRPC Port Arthur C6281 N38413239383029312429322956506851521SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654132353137362729262023272235354535321SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N37463136292932342924423166475543471SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643137413137323023252125302551385440431SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 139423240313229312731463064496848501Nederland High School C1035
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Austin Northwest C3/A322243404844363942303840263552415744412Austin Northwest C3/A322
Audubon C38148444948374447324241223547415848421Audubon C38
Fayette County C6012 N36384841293535302931272944395042442Fayette County C601
Dripping Springs School C6141 N48404545313944324442223646475445381Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N41404847293940343341293453504945421CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N47464947334449314342243749407049471CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N53485754415052384848293962466050481Gorzycki Middle School C1603
Lockhart C16041 N42385043293938323539253153454740411Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N42404642294342354040263659424941411CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 NNANANANANANANANANANANANANA234544451CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Houston East C1/G316237423037293434333418323257487548472Houston East C1/G316
Houston Aldine C8/AF108/X150 236453840273739343319333660457651522Houston Aldine C8/AF108/X150
Channelview C15/AH115 335333034282626242618312552455248473Channelview C15/AH115
Northwest Harris Co. C26/A110/X154234393938263335322923363145336943552Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239136362734303027292716362948486641431Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45140392942393331302720393052526449531Seabrook Friendship Park C45
Houston Bayland Park C53/A146 132373337353026272616352749356743451Houston Bayland Park C53/A146
Conroe Relocated C78/A321141454440324649453724383952226361481Conroe Relocated C78/A321
Manvel Croix Park C84137422946353633343218313054557047481Manvel Croix Park C84
Clinton C403/C304/AH113 331342933202428262519322743377442433Clinton C403/C304/AH113
Houston North Wayside C405128363033222829252517312844396739401Houston North Wayside C405
Houston Monroe C4061NANANANANA2525232612262444466139NA1Houston Monroe C406
Lang C408233383538263432322819302851347144492Lang C408
Houston Croquet C4092343931393134293329153630524965NA402Houston Croquet C409
Houston Westhollow C410134383945343232303218342953367045471Houston Westhollow C410
Houston Texas Avenue C411131343134222726282715353046456440421Houston Texas Avenue C411
Park Place C416135402836323130303016363150497642441Park Place C416
Sheldon C5511 N30352933222931273119282651405140411Sheldon C551
Baytown Wetlands Center C5521 N25241925222120201714262232343430321Baytown Wetlands Center C552
Crosby Library C5531 N33382832233028292817252654404937371Crosby Library C553
West Houston C5541 N30353740242930232616252642316637531West Houston C554
La Porte Sylvan Beach C5561 N39382838363026292621342945505346461La Porte Sylvan Beach C556
Mercer Arboretum C5571 N31373335233335302820273045226339401Mercer Arboretum C557
Tom Bass C5581 N31362438312928292715272542446439391Tom Bass C558
Katy Park C5591 N28303438272527242217262538315833421Katy Park C559
Atascocita C5601 N31373132253234312917272749335339401Atascocita C560
Meyer Park C5611 N27363233233133292916282741265935451Meyer Park C561
Bunker Hill Village C5621 N30432838273030252616302744295838421Bunker Hill Village C562
Huffman Wolf Road C5631 N37403638263530313115272757394938401Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N35423538323633323519362956507348491HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N414232372736333630243832625154NANA1Wallisville Road C617
Danciger C618 1 N39413050313131303121272853486542441Danciger C618
Mustang Bayou C619 1 N42433145353533322829323050556348511Mustang Bayou C619
Texas City 34th St. C620 1 N42433144393530342633352951546254541Texas City 34th St. C620
UH Moody Tower C6951 N37423023303433343015373255558146481UH Moody Tower C695
U of H-Sugarland C6961 N32353143322726262816402646355541431U of H-Sugarland C696
UH Coastal Center C6971 N33342537322626252021262439405143451UH Coastal Center C697
UH WG Jones Forest C6981 N39444441304446423624334248306851501UH WG Jones Forest C698
UH West Liberty C6991 N42504240314243433924363371534951521UH West Liberty C699
Lynchburg Ferry C1015/A165 137402932283330313020302849455447451Lynchburg Ferry C1015/A165
Lake Jackson C1016 1384128474133292826212926935290NA261Lake Jackson C1016
Baytown Garth C1017141423236283632362923373158475352521Baytown Garth C1017
Galveston 99th St. C1034/A320/X183144433450424137373136343251586955571Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2015POCMonitoring Site
San Antonio
San Antonio Northwest C23243404645373640353943263644455442372San Antonio Northwest C23
Camp Bullis C58148444645373845384344213547436240371Camp Bullis C58
Calaveras Lake C59138374241263436323636243244445140371Calaveras Lake C59
Elm Creek Elementary C5011 N40374042303237333537223346404739341Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4644424136364335393922354425NANANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N4444424131NA4034414023334337NANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N41364540293840343738213354405139381New Braunfels Airport C504
City of Garden Ridge C5051 N47414546283739353938253251425741361City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N39364339274039333633233149394937371Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N38364141283536343738253347475141371Heritage Middle School C622
CPS Pecan Valley C6781 N37363738262935313230212941394534301CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4240373447403128302934323743585445392Corpus Christi West C4
Corpus Christi Tuloso C21136353344353228312932333643495146351Corpus Christi Tuloso C21
Victoria C87140374244413129282941253041395741451Victoria C87
Aransas Pass C6591 N40383351433027302833322946585850411Aransas Pass C659
Holly Road C6601 N3574NANANA2423242530302938534935311Holly Road C660
Violet C6641 N33302839322924272425303642474840371Violet C664
Ingleside C6851 N37333145352724252627282441495138391Ingleside C685
Odem C6861 N35333141343026292630282943444838381Odem C686
Taft C6871 N36322939322524262330252545484941191Taft C687
Cuero C16021 NNANANANANANANANA2728262648404937421Cuero C1602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP143132323228303129302936334040434540271Mission C43/AP143
Brownsville C80/AGP180135322825272925272526274545524936231Brownsville C80/AGP180
Harlingen Teege C1023132322930283230292733274243515040291Harlingen Teege C1023
AreaMonitoring SitePOCApril 2015POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P244134364737292832333529253434383938261Laredo 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.