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Daily Maximum Eight-Hour Ozone Averages for May 2015

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 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 SitePOCMay 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2736655504337353431273938232524324151233529NA2Ft. Worth Northwest C13/AH302
Keller C172766551494236363229333538242723354154273127NA2Keller C17
Frisco C31/C6801707757564744454034373740263425404650334227NA1Frisco C31/C680
Midlothian OFW C52/A1371616448494236343128294129252823293935253525NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571777461584743434231393842243326355059NV3931NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C611626149484033322725324235232420333636223324NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C6791686952484339403631303837213221364248273826NA1Dallas North No.2 C63/C679
Rockwall Heath C691697159574645423935343840263324334542294428NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X1821766854534337403226353938212722374255293726NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711656254514039353533283330243020313833233321NA1Kaufman C71/A304/X071
Granbury C73/C6811736850514537393539344337312729424335313131NA1Granbury C73/C681
Eagle Mountain Lake C75 177645250413535333033384125252529NV542634NVNA1Eagle Mountain Lake C75
Parker County C761797052564939443738414549322933354552313634NA1Parker County C76
Cleburne Airport C77/C6821656446494233353334344432272626334134293428NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3716652504236383329323938202418334046253426NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021616144453833332425273633202419283435233024NA1Dallas Executive Airport C402
Greenville C1006/A1981596257534239373427263335242818353837253824NA1Greenville C1006/A198
Pilot Point C103216678615847444239NVNANANV263527385152404731NA1Pilot Point C1032
Italy C1044/A3231656451524438353130NV4431262822293930283427NA1Italy C1044/A323
Corsicana Airport C10511646354534040393531343029242921273733293023NA1Corsicana Airport C1051
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442706158634338313231343927252622263338253921NA2Longview C19/A127/C644
Tyler Airport Relocated C821636253604137313230333328283022323435243419NA1Tyler Airport Relocated C82
Karnack C85/AFHP303153625864463932362525NV26272922242641274221NA1Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X1512575654514748515361616641533436535547486132NA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591525052424042454657566037492930505038415530NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1535556454948525264625933513336545441516025NA1Chamizal C41/AH126
Socorro Hueco C49/F3121595460464750525258606342593637535544456531NA1Socorro Hueco C49/F312
Skyline Park C72158585850495153576360654355364154544854NV33NA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N595653445346513463664245475142445844483626NA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141565156424446485055565536513333485239466125NA1Ivanhoe C414
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Waco
Waco Mazanec C10371686751534539343032284129282924314134313126NA1Waco Mazanec C1037
Temple Georgia C10451727254644539332432293927302824314437303226NA1Temple Georgia C1045
Killeen Skylark Field C10471667054594541332534304026283124324035293129NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2666658645240332928274229212621232326232125NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412596654584738332725253933212522202330202227NA2West Orange C9/A141
Port Arthur West C28/A128/A2281676252595042352926264432272623232333222027NA1Port Arthur West C28/A128/A228
Hamshire C64/C654160685665514135302728NV33222824242530252229NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N696758614941343027274230222823232432232230NA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541606353584740352926253726NV2622252529222132NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N5761586350NV322725253925202622232226223026NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431585547534335302422213627182219202027191822NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 16667566351423630282742NV232924252533242330NA1Nederland High School C1035
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Austin
Austin Northwest C3/A3222736951NV423730252927392225NV25274132283526NA2Austin Northwest C3/A322
Audubon C38171735451453933293329352330282330NVNV29NVNVNA1Audubon C38
Fayette County C6012 N706555594338313129293525212523263335242725NA2Fayette County C601
Dripping Springs School C6141 N687053494439313436303926343127344934313529NA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N69675453454129NVNANV3825273024324134313425NA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N757355524542343134303524293226324237293523NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N727254504438312931294024303027304332283227NA1Gorzycki Middle School C1603
Lockhart C16041 N696553504539303131293727262628284332283428NA1Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N696750464238293232293822303028294432293226NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N716952524338312631283424272823274431273026NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162787161654738322728263317162717222320242120NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 2797865724737332629273222172517232623242526NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 3677355564635252222233424162217202219201822NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542656755724438353030283320202921242832283026NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391776556594438282524233725172420222620231923NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45171736162484231282625NV29222622252823242327NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 17965556545NANV2525243921162015212718202324NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A3211698067654838443838353424243828312838344029NA1Conroe Relocated C78/A321
Manvel Croix Park C841796758665042312827274530202520253222242528NA1Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANANANANANANV25243823152112222620201926NA3Clinton C403/C304/AH113
Houston North Wayside C4051656054584133272224232919121411191917191722NA1Houston North Wayside C405
Houston Monroe C406170585158NV33272423233625172117212618201823NA1Houston Monroe C406
Lang C408276695672NV37332829283221152418232624252726NA2Lang C408
Houston Croquet C4092786456644740312828274126192418243223252726NA2Houston Croquet C409
Houston Westhollow C410172665667474133302829NV27202619243327253029NA1Houston Westhollow C410
Houston Texas Avenue C41117261516141322623NV243318131915192320202123NA1Houston Texas Avenue C411
Park Place C4161776555644638312727263724192418242722232223NA1Park Place C416
Sheldon C5511 N596451534133252223222920142316212019191822NA1Sheldon C551
Baytown Wetlands Center C5521 NNANANANANANANV2827283932232823262824252429NA1Baytown Wetlands Center C552
Crosby Library C5531 N597053604235292625232016142217192019201920NA1Crosby Library C553
West Houston C5541 N676554714538302727263223162214202523232324NA1West Houston C554
Mercer Arboretum C5571 N577056594032302627262618172314202123222021NA1Mercer Arboretum C557
Tom Bass C5581 N665648564134262221213422151916202417181821NA1Tom Bass C558
Katy Park C5591 N586049604033272424243222122013172621212124NA1Katy Park C559
Atascocita C5601 N566452544133272425232619172318212122232321NA1Atascocita C560
Meyer Park C5611 N546149603932302726242816142316192022222121NA1Meyer Park C561
Bunker Hill Village C5621 N635950594134282424243119141912202218212524NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N566852574133292625232216152117222019192120NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N787562664738302424233824162518202219211925NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N616351544538302726243729202623232522232424NA1Wallisville Road C617
Danciger C618 1 N67635858NV44302727284226192221263322242124NA1Danciger C618
Mustang Bayou C619 1 N686459604943312826274028222723232720232125NA1Mustang Bayou C619
Texas City 34th St. C620 1 N777569695647373231314834293226293025272532NA1Texas City 34th St. C620
UH Moody Tower C6951 N816857664538332928273823192521243024252626NA1UH Moody Tower C695
U of H-Sugarland C6961 N696253614540312825254428172217223323232425NA1U of H-Sugarland C696
UH Coastal Center C6971 N615552564537262121213520171917212116171823NA1UH Coastal Center C697
UH WG Jones Forest C6981 N708165664738383435323222223624282837333529NA1UH WG Jones Forest C698
UH West Liberty C6991 N647361664739343131273426233028272827272829NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 1707456594536282524233527172419212320222022NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 1656260564642292726273725202521252720222122NA1Lake Jackson C1016
Baytown Garth C10171717560665345343231284234243027273027272829NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831806868665346353028294435293127292725242534NA1Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C232747755504240353038273325243328294237333831NA2San Antonio Northwest C23
Camp Bullis C581787556464140342737283727273530314139333729NA1Camp Bullis C58
Calaveras Lake C591686651474038313232283228283627274031293032NA1Calaveras Lake C59
Elm Creek Elementary C5011 N626650443836322933272824243030283733293032NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N767454454038332737273326273329304038333626NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N7571554642403128372734NVNANANANANANANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N656551484238303131273523272924274129262926NA1New Braunfels Airport C504
City of Garden Ridge C5051 N737155484240322934273524263226294032263128NA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N616150484136293130272923262825273929273025NA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N676752474239323133283227293828263831293031NA1Heritage Middle School C622
CPS Pecan Valley C6781 N626347413634272529242921223123253528262626NA1CPS Pecan Valley C678
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4272555452443832NVNANANANANANANV262828NVNANVNA2Corpus Christi West C4
Corpus Christi Tuloso C211745452514338313128293634232227262726262629NA1Corpus Christi Tuloso C21
Victoria C8717260565446392927272938322620292338NV252524NA1Victoria C87
Inez C6091 N726158564240302829303732232229243624252423NA1Inez C609
Coleto C6241 N695856544541323331334035302734284228292928NA1Coleto C624
Aransas Pass C6591 N73556054463628272830383728NV32262829282829NA1Aransas Pass C659
Holly Road C6601 N654950473932272523233331231723212223222222NA1Holly Road C660
Violet C6641 N695046453733262624233233241826222423222022NA1Violet C664
Ingleside C6851 N634750463932272625263534262030242526252527NA1Ingleside C685
Odem C6861 N705250494135292826253433242028232424232322NA1Odem C686
Cuero C16021 N656053514236292928282430202126233824242530NA1Cuero C1602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431624941423431303034262531202225262926212624NA1Mission C43/AP143
Brownsville C80/AGP1801534947483834302827262423NV2227272726272624NA1Brownsville C80/AGP180
Harlingen Teege C10231565345463535293029282426212423252929242525NA1Harlingen Teege C1023
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441545336343028323338302325192225282828293029NA1Laredo 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.