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Daily Maximum Eight-Hour Ozone Averages for April 2014

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2014 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 SitePOCApril 2014POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 245253248313349496057534733435459326555362Ft. Worth Northwest C13/AH302
Keller C17244263344313142446054524432405258356254342Keller C17
Frisco C31/C6801NVNVNV43343643446158504534405155425755331Frisco C31/C680
Midlothian OFW C52/A137141232945333547486256494232415054375952381Midlothian OFW C52/A137
Denton Airport South C56/A163/X157149303744363445466458574834435561405961281Denton Airport South C56/A163/X157
Arlington Municipal Airport C61142232942323347456154494331405055376351321Arlington Municipal Airport C61
Dallas North No.2 C63/C679143233342353647456259504535405255436056331Dallas North No.2 C63/C679
Rockwall Heath C69143233246353745475955494437445454516254361Rockwall Heath C69
Grapevine Fairway C70/A301/X182145253545353447476158534634545457386356331Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071141252641343438475551464334374849465649281Kaufman C71/A304/X071
Granbury C73/C681144263349383445485855514634455361376257321Granbury C73/C681
Eagle Mountain Lake C75 1432533443332454558535145304451NANV5655311Eagle Mountain Lake C75
Parker County C76146284351423646516158514633505564406461371Parker County C76
Cleburne Airport C77/C682145253448343547496458534734435358406258311Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NANANV453536454762564944NV404952406354323Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402140213043323343455854474232415052426352351Dallas Executive Airport C402
Greenville C1006/A198142243241313741485451464135375047495651281Greenville C1006/A198
Pilot Point C1032147293743343444486060564835445456415759251Pilot Point C1032
Italy C1044/A323137202744343042466354464231385255405449311Italy C1044/A323
Corsicana Airport C1051138212641353137455349444030354951445246291Corsicana Airport C1051
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644235223242333338465359464134345048524949192Longview C19/A127/C644
Tyler Airport Relocated C82139283243363340505657535035365048555351311Tyler Airport Relocated C82
Karnack C85/AFHP30313622324235363645585745433428494951485271Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151248505548565351514548454049404752575347152El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X15913844494249464644373632324236424149443781Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15050NVNANANANV494849473951364254544944121Chamizal C41/AH126
Socorro Hueco C49/F312146455347515149554647444045384750525042131Socorro Hueco C49/F312
Skyline Park C721485053475450NV494447444249384754505042161Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N51535351535854535456534856455052564745343BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414150485645565348534950484149394553524941141Ivanhoe C414
Cd Juarez Delphi C6631 N36424137444237403132293239343636NVNANANA1Cd Juarez Delphi C663
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Waco
Waco Mazanec C1037139213046383042486353464333415255435254291Waco Mazanec C1037
Temple Georgia C1045141243250423444516758524735435455435459281Temple Georgia C1045
Killeen Skylark Field C1047144273651413546506658575037435660435359341Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2NANANANANANANANANANV424633294749394455202Beaumont-Downtown C2/A112/C2002
West Orange C9/A141236302741422538476356464226304550394347162West Orange C9/A141
Port Arthur West C28/A128/A228135273140402439465452444429294450404147201Port Arthur West C28/A128/A228
Hamshire C64/C654137313445422440495955484633294651434749181Hamshire C64/C654
SETRPC Port Arthur C6281 N31NV3138362135414947393929274144363842221SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165412320192422102427NANV504736364752434751291SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N35293239392536465955464229294248NV4353141SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643134263239362339455452444229274346364047181SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 138293542412541495956484634304852414352161Nederland High School C1035
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Austin
Austin Northwest C3/A322237233448403347496052494332425256405153342Austin Northwest C3/A322
Audubon C38138253449402743486154514531405057364955311Audubon C38
Fayette County C6012 NNANANANANANANANANANANANANV425555465458432Fayette County C601
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316230232338392242435753444329324250504650242Houston East C1/G316
Houston Aldine C8/AF108/X150 228212245392847495953464329324551524856232Houston Aldine C8/AF108/X150
Channelview C15/AH115 320182144382247484948383826344645454542223Channelview C15/AH115
Northwest Harris Co. C26/A110/X154227192141352441465346403524304145NV4561252Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239128232544412044465348404029324549444645191Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45131263040432148475649434330344551454746191Seabrook Friendship Park C45
Houston Bayland Park C53/A146 127222344402146NV5747414129354749465251351Houston Bayland Park C53/A146
Conroe Relocated C78/A321140292948393141456459575332324856495052251Conroe Relocated C78/A321
Manvel Croix Park C84130242546442250515650434230364749455651281Manvel Croix Park C84
Clinton C403/C304/AH113 325161544401841435043343827294645474947293Clinton C403/C304/AH113
Houston North Wayside C405127202143392742465551444328324547465055281Houston North Wayside C405
Houston Monroe C406130232541422249515754444230304548444947271Houston Monroe C406
Lang C408227222041382647495948434328344345474858362Lang C408
Houston Croquet C409229242443442147485648424130344648445251322Houston Croquet C409
Houston Westhollow C410127222445402246475548414128324748455353381Houston Westhollow C410
Houston Texas Avenue C41112519184138204242NV44373826314246454750331Houston Texas Avenue C411
Park Place C416130232144432048475851444328304447414846291Park Place C416
Sheldon C5511 N22191845372344465146353625NVNANANV5553301Sheldon C551
Baytown Wetlands Center C5521 N31262343412146455245424329324546444542191Baytown Wetlands Center C552
Crosby Library C5531 N30262442382645486251444429314448484345151Crosby Library C553
West Houston C5541 N31242446412749515851454529365154535565311West Houston C554
La Porte Sylvan Beach C5561 N36273245432449495652464431364853464647231La Porte Sylvan Beach C556
Mercer Arboretum C5571 N30222244372742455750464428314551514652141Mercer Arboretum C557
Tom Bass C5581 N272122404018434552453838263342NV414845271Tom Bass C558
Katy Park C5591 N27212443382344465347413926314548464756361Katy Park C559
Atascocita C5601 N28242342352642455652434327294348484546181Atascocita C560
Meyer Park C5611 N30232243372744465650444227344449504757201Meyer Park C561
Huffman Wolf Road C5631 N322525433527434664514541NVNA4446474344181Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N25202244442448484552434127344851504948301HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N37302950452753556551484833385253515150191Wallisville Road C617
Danciger C618 1 N25202452402047515449413927315149455948181Danciger C618
Mustang Bayou C619 1 N38293351412152525853454632375151475948221Mustang Bayou C619
Texas City 34th St. C620 1 N34272946412358515649454431404953474849301Texas City 34th St. C620
UH Moody Tower C6951 N332627494623535365554747333648NV475152351UH Moody Tower C695
U of H-Sugarland C6961 N262024434621434554483939273346NV455250351U of H-Sugarland C696
UH Coastal Center C6971 N3628334641215350NV504545323748NV455351231UH Coastal Center C697
UH WG Jones Forest C6981 N362627474031475364585350313649NV505156351UH WG Jones Forest C698
UH West Liberty C6991 N40313351433249557460NVNV354052NV555151261UH West Liberty C699
Lynchburg Ferry C1015/A165 124202337362340444848394027333945433740231Lynchburg Ferry C1015/A165
Lake Jackson C1016 131232852412147515749424128345150465846191Lake Jackson C1016
Baytown Garth C1017136292947432648506051474732344748494747181Baytown Garth C1017
Galveston 99th St. C1034/A320/X183137303245402363505753494532414754515150401Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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San Antonio
San Antonio Northwest C23238313349382841444945454138344557405257392San Antonio Northwest C23
Camp Bullis C58143343454422828506355564840425563415762371Camp Bullis C58
Calaveras Lake C591NV273151372743505851474234395356385154371Calaveras Lake C59
Elm Creek Elementary C5011 N35333048352641505650464237395254405554351Elm Creek Elementary C501
Fair Oaks Ranch C5021 N41293349392642496054544638NVNANANANANANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N40303251402640516556544637425458375158371Bulverde Elementary C503
New Braunfels Airport C5041 N35252948372544495851494431385255385154361New Braunfels Airport C504
City of Garden Ridge C5051 N30222747332335455246433828364550334751321City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N34253047332844475953494431374855394954361Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N362731543924445362545044354156NV405760321Heritage Middle School C622
CPS Pecan Valley C6781 N38293251372640506153494433344955375051341CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4225212347392140515147413827365049455747462Corpus Christi West C4
Corpus Christi Tuloso C21124212348362140505046403826355150425646441Corpus Christi Tuloso C21
Victoria C87122202244382241445048413927385048434849281Victoria C87
Inez C6091 NNANANV47452337464949424329404651474850241Inez C609
Coleto C6241 NNANANANANANANANANANANANANANANV47424546291Coleto C624
Aransas Pass C6591 NNANANV53452442576054474324455858506852341Aransas Pass C659
Holly Road C6601 N31262854442546535955484531445657516653521Holly Road C660
Violet C6641 N23202249382347525248414027355352NVNANANA1Violet C664
Ingleside C6851 NNANANANVNVNANANANANANANANANANANANANANANA1Ingleside C685
Odem C6861 N24212450412244515349444027355253476151481Odem C686
Taft C6871 N31252748422244525551464330395152476251471Taft C687
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143122283648372954474943413830324948384140321Mission C43/AP143
Brownsville C80/AGP180122212551452539535350443926385252414743371Brownsville C80/AGP180
Harlingen Teege C1023121222953422642525349454129355552394642351Harlingen Teege C1023
AreaMonitoring SitePOCApril 2014POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244134383650364451525446464140345052414040281Laredo 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 - 0.059
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.