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Daily Maximum Eight-Hour Ozone Averages for April 2015

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2015 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 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 23237434628343325334140303927494428NV53464844292051NA2Ft. Worth Northwest C13/AH302
Keller C17232363945273633243142412937245146315446424642292346NA2Keller C17
Frisco C31/C68013342404432383828413947334125594945545243NVNV41NANANA1Frisco C31/C680
Midlothian OFW C52/A137132354242293434243336372934254543324550464542292949NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X157133424346324037273743513442275849375354454346362950NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C6113034404329323321313336273524454230NANV444240281848NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679130383942283535253937463136235543375252433842321952NA1Dallas North No.2 C63/C679
Rockwall Heath C69134374445323435274140473139245844434854464046392359NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X182131374246273534253842463139255445345852454245322348NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071134354241303234263334442932204640404350433643322750NA1Kaufman C71/A304/X071
Granbury C73/C681140424550323639243543333141314444394955515542323153NA1Granbury C73/C681
Eagle Mountain Lake C75 131354145283332223240402838254844264650414839272446NA1Eagle Mountain Lake C75
Parker County C76137444753353636264750373242304944365156495549353053NA1Parker County C76
Cleburne Airport C77/C682135394545313937253237342938284243374749495142322948NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 330374145263434223839442936205143335253473945311552NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402127323840243032223534362632204539294148433941251748NA1Dallas Executive Airport C402
Greenville C1006/A1981353543402832342836374228352046NANV4249442439392552NA1Greenville C1006/A198
Pilot Point C1032133424041313837274142443343285445404853473743403250NA1Pilot Point C1032
Italy C1044/A323133364442303436263638402735254742374349494545323148NA1Italy C1044/A323
Corsicana Airport C1051133334344293135253032372734264246354446434745283148NA1Corsicana Airport C1051
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C64423742414132324538343146242617NVNV544548454450393050NA2Longview C19/A127/C644
Tyler Airport Relocated C82136374246324038343132522731174144474351444443393351NA1Tyler Airport Relocated C82
Karnack C85/AFHP303135423937273141323030442920203741373543422648292347NA1Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X1512464756434644394351343939445351555754576152NV395154NA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159139405340393633334929373544464348494852NV4543364347NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 14747543547454042503040414248525659575759NV50405356NA1Chamizal C41/AH126
Socorro Hueco C49/F312146465341454237355134383946525050565558575449435052NA1Socorro Hueco C49/F312
Skyline Park C72148475443494742525437444445555362635556625450435354NA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N514651404235333342383144NV404951496362515257465657NA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414146475138444439475335413944495056565455575551384649NA1Ivanhoe C414
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Waco
Waco Mazanec C1037131354441273436253234312537284544424249485444313150NA1Waco Mazanec C1037
Temple Georgia C1045137404646243842283937272645364944444452526148413154NA1Temple Georgia C1045
Killeen Skylark Field C1047141424846294244293842242846385142414356516244363157NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 238423137213227292521312750455343383455465151422644NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141232383034242525272420272445394841353151395045422140NA2West Orange C9/A141
Port Arthur West C28/A128/A228136402936273026272427282647425647423447395448372440NA1Port Arthur West C28/A128/A228
Hamshire C64/C654136423139263228302623322752455247423356425349392542NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N36393038292528272226282446445748433551455148412539NA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541303229333025NV23192024192930363226131821NVNV342537NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N36422935232128302719342749424641393154415349412440NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431353928352428NV232020242141354738352643364238342034NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 137403036233027282524332651445945403454435349412642NA1Nederland High School C1035
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Austin
Austin Northwest C3/A322237354540283637273333192944394838383753516141362852NA2Austin Northwest C3/A322
Audubon C38141394543313942293736162943395139403753526344412954NA1Audubon C38
Fayette County C6012 N34324236263332282624242941334641403642475846322743NA2Fayette County C601
Dripping Springs School C6141 N41354341263541293835203042384738354252525942373352NA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N38344540183637313130242945434538394150476146312954NA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N41404542304044293935213045385343424149516446413154NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N45425348334447354240223354435442465263626950353054NA1Gorzycki Middle School C1603
Lockhart C16041 N36354640243634293230212746404435393651476041312951NA1Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N38364338253840323633223048394535373551526041282651NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 NNANANANANANANANANANANANANANV4038414351505942352754NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31623438333219303231309262551366244393249375152542551NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 231413736233335322915262953346646413652445857552455NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 3NV313130212324232314262047344544362947394541452044NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542313637342331323027192828432654414538424160514926NANA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239132352731252825262410282443375540383040394847572243NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45137382636303027292513322745465850473447425549472345NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 130333434262725252311272444315941353037405144422243NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A321136423936284043393321323147155248443743425866462648NA1Conroe Relocated C78/A321
Manvel Croix Park C841344032412732293129142927484758NV403844485449422549NA1Manvel Croix Park C84
Clinton C403/C304/AH113 329303031162224232312252437286039342641414641541848NA3Clinton C403/C304/AH113
Houston North Wayside C405125323130182426232213242339255537292539394548482142NA1Houston North Wayside C405
Houston Monroe C4061NANANANANANV2321238222038345439342938364742421943NA1Houston Monroe C406
Lang C408231343434192929282610232645266340403246405348572550NA2Lang C408
Houston Croquet C409233363234263028292612302748385741383344435248442547NA2Houston Croquet C409
Houston Westhollow C410132353640263030282816252746296244393645475550412648NA1Houston Westhollow C410
Houston Texas Avenue C411127313131152525252411262442315338363142394642521843NA1Houston Texas Avenue C411
Park Place C416131372931252829272710282644376439393143385047552246NA1Park Place C416
Sheldon C5511 N28333130182528262616212245304538292441394540402145NA1Sheldon C551
Baytown Wetlands Center C5521 N24231923171918181512201828283129261930273230331729NA1Baytown Wetlands Center C552
Crosby Library C5531 N30352830202525272514212248284134322645344743452049NA1Crosby Library C553
West Houston C5541 N28323536192728202313212438255635403140415545422343NA1West Houston C554
La Porte Sylvan Beach C5561 N36363034262724272415282441444844NVNANANANANANANANANA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N26333232212931292615202440185034343041365152472346NA1Mercer Arboretum C557
Tom Bass C5581 N29332733232625252411232238365337342735384640342039NA1Tom Bass C558
Katy Park C5591 N26283234192424212014222335234733332936394839312035NA1Katy Park C559
Atascocita C5601 N27343028212831292614212343264436322638344538412440NA1Atascocita C560
Meyer Park C5611 NNV323130202829262513202337195033352938365245452240NA1Meyer Park C561
Bunker Hill Village C5621 N27353234162827232412222239245335352538404841422240NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N343735352331282928122223492939363729NVNA47464623NANA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N32393434223131303014292451365845382951435349512353NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N384034362332313228203329554450NANANANANANANV472442NA1Wallisville Road C617
Danciger C618 1 N37393045273028282819242448425441383440535545282142NA1Danciger C618
Mustang Bayou C619 1 N40412940343230302723292643505747443546495050352347NA1Mustang Bayou C619
Texas City 34th St. C620 1 N39413041333229312526322646485751453653475755482849NA1Texas City 34th St. C620
UH Moody Tower C6951 N3439NVNV23313131NVNV292850417243413747445243552549NA1UH Moody Tower C695
U of H-Sugarland C6961 N2932333927252424NV13312442295240383140424842322242NA1U of H-Sugarland C696
UH Coastal Center C6971 N30302433252422NV1918242034334743373040NVNV42321836NA1UH Coastal Center C697
UH WG Jones Forest C6981 N33413937273841363221293146245641433945426066543248NA1UH WG Jones Forest C698
UH West Liberty C6991 N4046373828383937342232306441NV50NVNV61NV585457NV63NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 134382629212829292714252342374743403041394842542144NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 1353927413530272625172623NV46NANANV3341505247312242NA1Lake Jackson C1016
Baytown Garth C1017138403335233231322720332852414950423553NV5451562850NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X183142413245383732342728323249535753484258456055412949NA1Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C23239374341323238323638233141394834303748505740NVNANANA2San Antonio Northwest C23
Camp Bullis C58142404341303342334040192842395136283650505838332749NA1Camp Bullis C58
Calaveras Lake C59135333837243133293233212639384331322944465439282759NA1Calaveras Lake C59
Elm Creek Elementary C5011 N35333938262835303332202641364232263143445037272442NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N40384038303140313734202840364634283447455538322746NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N38384037NVNANANV383520284031523528344748NVNANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N36334037243538313429182745364634363250485941313050NA1New Braunfels Airport C504
City of Garden Ridge C5051 N40364441253437313533222945395136333554505941302761NA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N353439362336363033281927443442313530464257413029NVNA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N36343937253233303334232842404434333047475641272862NA1Heritage Middle School C622
CPS Pecan Valley C6781 N3432363523NV32273028192437354029262640404333262251NA1CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4237343244292927272729303140475135343936455547212645NA2Corpus Christi West C4
Corpus Christi Tuloso C211343232422930272827272833NV404733303837455042212440NA1Corpus Christi Tuloso C21
Victoria C87136323940292927262632232839345233404338445533NANV47NA1Victoria C87
Inez C6091 NNANANANANANANANANANANANANANANANANV3740455545292548NA1Inez C609
Coleto C6241 NNANANANANANANANANANANANANANV5035424342465848323145NA1Coleto C624
Aransas Pass C6591 N37363248332926272729313643515541294439485448222548NA1Aransas Pass C659
Holly Road C6601 N33282738232321232326252634434526283429414840152038NA1Holly Road C660
Violet C6641 N302827372526222422212632384145303339324453NV17NV40NA1Violet C664
Ingleside C6851 N34322842282623242324263336424731274133425038182238NA1Ingleside C685
Odem C6861 N33312839262825262426253138384531273837444838192241NA1Odem C686
Taft C6871 N32302537252322222224243038384633NVNANANANANANANANANA1Taft C687
Cuero C16021 NNANANANANANANANANV25242542324532363446465543272545NA1Cuero C1602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143130293026272927292729283632384025233733504339272932NA1Mission C43/AP143
Brownsville C80/AGP180132302424262824252324243833494620183824544841202940NA1Brownsville C80/AGP180
Harlingen Teege C1023131302428273027272629253534494823233730544635232832NA1Harlingen Teege C1023
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441313337362724303029272322302836282229NV413329212742NA1Laredo 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.