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Daily Maximum Eight-Hour Ozone Averages for April 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2017 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 2017POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2453852504354584742304743374234303343404035375256462782Ft. Worth Northwest C13/AH302
Keller C172493854514257624942314746404536303545414236385159472572Keller C17
Frisco C31/C6801503551554354635345324144415139323847414538344859492371Frisco C31/C680
Midlothian OFW C52/A13715144526047556152443242474144393238444343413957584929181Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571524050514254625144344549394638323651424736365060502341Denton Airport South C56/A163/X157
Arlington Municipal Airport C611443651534253554639264141353731253236353533354951422481Arlington Municipal Airport C61
Dallas North No.2 C63/C67914935NV594154625244323843394737292844373935344955462561Dallas North No.2 C63/C679
Rockwall Heath C6914831575336515848433029383748353030373635303547554122111Rockwall Heath C69
Grapevine Fairway C70/A301/X1821483651514051595043284243374134283344394135365054472251Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114735475144535650453228423746363136363634303349554325141Kaufman C71/A304/X071
Granbury C73/C68114538505445526049423555463841352736434240394051594830141Granbury C73/C681
Eagle Mountain Lake C75 15238485444566353433648484047373236494344363851604926101Eagle Mountain Lake C75
Parker County C7614336465143505446393949473740332837414041343848584831211Parker County C76
Cleburne Airport C77/C682151415557475464534534525040443731414644434141576352NVNA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3473859574453685645304344314737312945384037385458462363Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402145375255405357474129364234413328323528NV293147493822111Dallas Executive Airport C402
Greenville C1006/A1981542755534651605047342939374939293740353631355057462781Greenville C1006/A198
Pilot Point C10321493448514351625244334343425140333951454939364960532591Pilot Point C1032
Italy C1044/A32314844445546556149433337423540352833363328313355544127111Italy C1044/A323
Corsicana Airport C105114640475244545952453534433949363238353835313352574329171Corsicana Airport C1051
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C64425128465046516262534134424049363238313132363250545134132Longview C19/A127/C644
Tyler Airport Relocated C82155334963475158575540NANV3749363239343031323448NANV29151Tyler Airport Relocated C82
Karnack C85/AFHP30315528465642486357563935394550383239273130353244564635101Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X15125354505860504940495751495952525356494349594554564959372El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X15915151505357484237485947465350495052454045554350524754321Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15153505756NV4843556046515655565661534855654453615263391Chamizal C41/AH126
Socorro Hueco C49/F31215050475254474635465944464649485053484145564147514655341Socorro Hueco C49/F312
Skyline Park C7215455525860524941535851506152515157494559594351545161471Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N5253575954505754465240424545444953565153634947576055503BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C41415353505856464738475743464748484853474152554245524857391Ivanhoe C414
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Waco
Waco Mazanec C103715144455445546051443737444443353135373635343754544234141Waco Mazanec C1037
Temple Georgia C104514746506248586955463746474144393439424039414055624541151Temple Georgia C1045
Killeen Skylark Field C104714444506546577154463445474045403541424443423851685243241Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2492252NVNV506563554635394949363330253130273240634332212Beaumont-Downtown C2/A112/C2002
West Orange C9/A14125325555240476161544337354645353028323028283034584430162West Orange C9/A141
Port Arthur West C28/A128/A22815425585645516063584846394848383431313330293241644533211Port Arthur West C28/A128/A228
Hamshire C64/C65415427585245466360534443384745363432333131283239634333181Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541562759604554586662494236NV49403533343531303244595235261SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64315529585445525963574743384747373532313231293341654535211SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1542759564350626357474338474736353129NV30293239NV4434211Nederland High School C1035
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Austin
Austin Northwest C3/A3222414250554552635042293944364236333640NV3636344856NV52232Austin Northwest C3/A322
Audubon C3814038496045576650422734453842363336404138383448604551211Audubon C38
Fayette County C6012 N4740565547556256473740434541383637394131273752573953242Fayette County C601
Dripping Springs School C6141 N3841486244516650423335464041363340464139413750594453271Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N3233504537415140342625363434322930283328293045523344191CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N4437496246596953453239464145403637404342413649654852251CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N3536465039475744362532403335312935383432323243504346251Gorzycki Middle School C1603
Lockhart C16041 N4040585747526454442932403940373538373837383655583854261Lockhart C1604
St. Edwards University C16051 NNV3645484045554437253038323631303237NVNV303145513648201St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N3941605544516651423135443940363436423937363549604053181CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N41455256465562504229NVNANANANANANV383835363651574046201CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31624925565441487059544134324749383636343134293441644141152Houston East C1/G316
Houston Aldine C8/AF108/X150 250345957464968605540353651534237NV3735393236456542NV162Houston Aldine C8/AF108/X150
Channelview C15/AH115 34525544646496856524335324243383532313133273541654044213Channelview C15/AH115
Northwest Harris Co. C26/A110/X15425033515644496455523935405652423541403939313743NV4143172Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23914924545044496657514238354645363533383231263341623839201Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4515226NV514754NV615447NVNV4846383734393533273343664335241Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14531545345576256504138354946363434373534273643573945221Houston Bayland Park C53/A146
Conroe Relocated C78/A32115233557045538163614439395054544044374457433745804845151Conroe Relocated C78/A321
Manvel Croix Park C8414729575350616462554440365347383835413735313950604148211Manvel Croix Park C84
Clinton C403/C304/AH113 34628464743516156513935314747363431343132273545563640183Clinton C403/C304/AH113
Houston North Wayside C40514829495141496454513933334648373534343234273542593739131Houston North Wayside C405
Houston Monroe C40614124474240445249443731263940282926312627243342503538171Houston Monroe C406
Lang C40824434505142516353503934344846353333343334283641594141152Lang C408
Houston Croquet C40924430545245566056504038344944353534383534273643NV3844182Houston Croquet C409
Houston Westhollow C41014435525142545954483937395142363435393533283443604043211Houston Westhollow C410
Park Place C416145254849415059534940343144NANANANV34313227324153NV39171Park Place C416
Sheldon C5511 N3523403736374741383330273434312828272629273133463334221Sheldon C551
Baytown Wetlands Center C5521 N341634323436NVNANANANANANANANANANANV2123182933583526151Baytown Wetlands Center C552
Crosby Library C5531 N36125044404156393819NVNANANA444434373539323841834447201Crosby Library C553
West Houston C5541 N4632525445516255514139425344393536383835293545643844191West Houston C554
La Porte Sylvan Beach C5561 N261626242527NVNANANANANANANANANANANV343910159861La Porte Sylvan Beach C556
Mercer Arboretum C5571 N3831414236384843413632304040373434363539323637483640271Mercer Arboretum C557
Tom Bass C5581 N4024474542485552473836304340323228343028253340513538171Tom Bass C558
Katy Park C5591 N3930454239445149433432374333292830313025223040503337181Katy Park C559
Atascocita C5601 NNANANANANV18292423161413202117151513121611111427151651Atascocita C560
Meyer Park C5611 N372241423338494139262327403929262925NV28232529492931131Meyer Park C561
Huffman Wolf Road C5631 N2724242727303624292828272926272726262523242626372826251Huffman Wolf Road C563
Clear Brook High School C5701 N4626NVNV4654615851NV38324647353432353230273446NVNV37201Clear Brook High School C570
Clear Creek High School C5711 N392450NVNVNV5953NVNVNVNVNVNANANANV29NVNVNV3245NVNVNV181Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N492556524753715852413634484936323533NV33283742673842191HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N4828555346507559544641364546403835NV3238293339744235171Wallisville Road C617
Danciger C618 1 N4325524545565355463943384438323229333327253449543446191Danciger C618
Texas City 34th St. C620 1 N5529515251576962595149NV5151393935413835293650645236291Texas City 34th St. C620
UH Moody Tower C6951 N4934565147556460544238344850383735373335NVNV45614344171UH Moody Tower C695
U of H-Sugarland C6961 N4737NV5146576057524244415146383636413932313647584248221U of H-Sugarland C696
UH Coastal Center C6971 N5126504848586161564946384947373532403532NV3450NVNVNVNA1UH Coastal Center C697
UH WG Jones Forest C6981 N543559665155796260NV3838525849414541435540374780NV47211UH WG Jones Forest C698
UH West Liberty C6991 N4531NVNV4648786055NV3435444239353233303931313880NV39NA1UH West Liberty C699
Lake Jackson C1016 14929544848575961554647374747373733363731273648554936241Lake Jackson C1016
Baytown Garth C101715029575648517861554945404949434037393741323441754437191Baytown Garth C1017
Galveston 99th St. C1034/A320/X18315629555455597268655553465354434136474037323754645038281Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N4522454635515454534044384648373633384032273145524832151Oyster Creek C1607
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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San Antonio
San Antonio Northwest C2323939525645586351413439514143363640515541373950594759272San Antonio Northwest C23
Camp Bullis C58 13639525845576650413230474042353441475743383949615058171Camp Bullis C58
Calaveras Lake C59134395049445259474031334238383333414444NV343650564157271Calaveras Lake C59
Elm Creek Elementary C5011 N3841565950576453453540484242373847585044394256604766201Elm Creek Elementary C501
Fair Oaks Ranch C5021 N3938505644576549413233474042363539425743373949604957221Fair Oaks Ranch C502
Bulverde Elementary C5031 N3938485743526448403132454041343335414940393747614853161Bulverde Elementary C503
New Braunfels Airport C5041 N3742585545516751423035434039353436403937363549624158221New Braunfels Airport C504
City of Garden Ridge C5051 N3640515745536248403131454038343336454436373849584159211City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N3538534940476148392831423636323131353534323043563752121Seguin Outdoor Learning Center C506
Heritage Middle School C6221 NNVNANANANANANANANANANV454042363641414738383754604462251Heritage Middle School C622
CPS Pecan Valley C6781 N23273635323943332619NVNANV24212022272520182737412744141CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C424141564347515453453844404036333545444727243451553950352Corpus Christi West C4
Corpus Christi Tuloso C2114143564448555754423540343936333648454829253552563848331Corpus Christi Tuloso C21
Victoria C8714242534848535955473844414240363741434429253651593955271Victoria C87
Inez C6091 NNANANANANANANANANANANANANANV363537424028243651573553221Inez C609
Holly Road C6601 NNANANANANANA6261524452444642404150525230264159634557421Holly Road C660
Violet C6641 N3538513942515148383240343531283142424423203248503444291Violet C664
Ingleside C6851 N443856494352NV57514146404137363746434727243748564344361Ingleside C685
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP14313242534043494844373037303634313438494734293546473543271Mission C43/AP143
Brownsville C80/AGP18013136543548515248393341333735323734474529262648523245311Brownsville C80/AGP180
Harlingen Teege C102313440563848525249403340344040374140555335313354583550371Harlingen Teege C1023
AreaMonitoring SitePOCApril 2017POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P24413737495140444641373235313533303439414737352746454646251Laredo 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 - 0.054
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.