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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 273665550433735343127393823252432415123352920233633NA2Ft. Worth Northwest C13/AH302
Keller C172766551494236363229333538242723354154273127232434NVNA2Keller C17
Frisco C31/C680170775756474445403437374026342540465033422731283838NA1Frisco C31/C680
Midlothian OFW C52/A137161644849423634312829412925282329393525352529263434NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571777461584743434231393842243326355059NV393130294139NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C61162614948403332272532423523242033363622332428223135NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679168695248433940363130383721322136424827382625263435NA1Dallas North No.2 C63/C679
Rockwall Heath C69169715957464542393534384026332433454229442837273644NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X18217668545343374032263539382127223742552937262725NV38NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071165625451403935353328333024302031383323332135253141NA1Kaufman C71/A304/X071
Granbury C73/C681173685051453739353934433731272942433531313119253737NA1Granbury C73/C681
Eagle Mountain Lake C75 177645250413535333033384125252529NV542634NVNV233537NA1Eagle Mountain Lake C75
Parker County C76179705256493944373841454932293335455231363421284040NA1Parker County C76
Cleburne Airport C77/C682165644649423335333434443227262633413429342822243532NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 371665250423638332932393820241833404625342631253334NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402161614445383333242527363320241928343523302429242735NA1Dallas Executive Airport C402
Greenville C1006/A198159625753423937342726333524281835383725382430243044NA1Greenville C1006/A198
Pilot Point C103216678615847444239NVNANANV26352738515240473132283939NA1Pilot Point C1032
Italy C1044/A3231656451524438353130NV443126282229393028342725263333NA1Italy C1044/A323
Corsicana Airport C1051164635453404039353134302924292127373329302327283340NA1Corsicana Airport C1051
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442706158634338313231343927252622263338253921402930NVNA2Longview C19/A127/C644
Tyler Airport Relocated C82163625360413731323033332828302232343524341939243248NA1Tyler Airport Relocated C82
Karnack C85/AFHP303153625864463932362525NV26272922242641274221383527NVNA1Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151257565451474851536161664153343653554748613254585656NA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159152505242404245465756603749293050503841553042505149NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 153555645494852526462593351333654544151602552585857NA1Chamizal C41/AH126
Socorro Hueco C49/F312159546046475052525860634259363753554445653151555656NA1Socorro Hueco C49/F312
Skyline Park C72158585850495153576360654355364154544854NV3359605856NA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N59565344534651346366424547514244584448362638355866NA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414156515642444648505556553651333348523946612549515050NA1Ivanhoe C414
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Waco
Waco Mazanec C1037168675153453934303228412928292431413431312627293431NA1Waco Mazanec C1037
Temple Georgia C1045172725464453933243229392730282431443730322637323727NA1Temple Georgia C1045
Killeen Skylark Field C1047166705459454133253430402628312432403529312932293526NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 266665864524033292827422921262123232623212533243340NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141259665458473833272525393321252220233020222732222642NA2West Orange C9/A141
Port Arthur West C28/A128/A228167625259504235292626443227262323233322202736253429NA1Port Arthur West C28/A128/A228
Hamshire C64/C654160685665514135302728NV3322282424253025222937253446NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N69675861494134302727423022282323243223223035263448NA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541606353584740352926253726NV262225252922213235263441NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N5761586350NV32272525392520262223222622302633253245NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643158554753433530242221362718221920202719182230212938NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 16667566351423630282742NV23292425253324233039273646NA1Nederland High School C1035
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Austin
Austin Northwest C3/A3222736951NV423730252927392225NV2527413228352631343527NA2Austin Northwest C3/A322
Audubon C38171735451453933293329352330282330NVNV29NVNV24333324NA1Audubon C38
Fayette County C6012 N70655559433831312929352521252326333524272535303740NA2Fayette County C601
Dripping Springs School C6141 N68705349443931343630392634312734493431352932373829NA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N69675453454129NVNANV382527302432413431342537353832NA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N75735552454234313430352429322632423729352328333627NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N72725450443831293129402430302730433228322729363628NA1Gorzycki Middle School C1603
Lockhart C16041 N696553504539303131293727262628284332283428323836NVNA1Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N69675046423829323229382230302829443229322631343126NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N71695252433831263128342427282327443127302635353429NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162787161654738322728263317162717222320242120302536NVNA2Houston East C1/G316
Houston Aldine C8/AF108/X150 279786572473733262927322217251723262324252638233849NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 367735556463525222223342416221720221920182231233344NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X154265675572443835303028332020292124283228302642253746NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239177655659443828252423372517242022262023192330233241NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45171736162484231282625NV2922262225282324232733263540NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 17965556545NANV252524392116201521271820232431203337NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A321169806765483844383835342424382831283834402930314347NA1Conroe Relocated C78/A321
Manvel Croix Park C84179675866504231282727453020252025322224252835253948NA1Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANANANANANANV25243823152112222620201926302237NANA3Clinton C403/C304/AH113
Houston North Wayside C405165605458413327222423291912141119191719172227203039NA1Houston North Wayside C405
Houston Monroe C406170585158NV3327242323362517211721261820182330203242NA1Houston Monroe C406
Lang C408276695672NV3733282928322115241823262425272632243747NA2Lang C408
Houston Croquet C409278645664474031282827412619241824322325272634243747NA2Houston Croquet C409
Houston Westhollow C410172665667474133302829NV2720261924332725302937253749NA1Houston Westhollow C410
Houston Texas Avenue C41117261516141322623NV24331813191519232020212327203342NA1Houston Texas Avenue C411
Park Place C416177655564463831272726372419241824272223222331223646NA1Park Place C416
Sheldon C5511 N596451534133252223222920142316212019191822292230NVNA1Sheldon C551
Baytown Wetlands Center C5521 NNANANANANANANV282728393223282326282425242935253240NA1Baytown Wetlands Center C552
Crosby Library C5531 N59705360423529262523201614221719201920192031223236NA1Crosby Library C553
West Houston C5541 N67655471453830272726322316221420252323232434223340NA1West Houston C554
Mercer Arboretum C5571 N57705659403230262726261817231420212322202132213339NA1Mercer Arboretum C557
Tom Bass C5581 N66564856413426222121342215191620241718182129193040NA1Tom Bass C558
Katy Park C5591 N58604960403327242424322212201317262121212432203140NA1Katy Park C559
Atascocita C5601 N56645254413327242523261917231821212223232132243239NA1Atascocita C560
Meyer Park C5611 N54614960393230272624281614231619202222212132203236NA1Meyer Park C561
Bunker Hill Village C5621 N63595059413428242424311914191220221821252430172938NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N56685257413329262523221615211722201919212031193438NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N787562664738302424233824162518202219211925NV293544NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N61635154453830272624372920262323252223242432243343NA1Wallisville Road C617
Danciger C618 1 N67635858NV4430272728422619222126332224212433264042NA1Danciger C618
Mustang Bayou C619 1 N686459604943312826274028222723232720232125NVNANANANA1Mustang Bayou C619
Texas City 34th St. C620 1 N77756969564737323131483429322629302527253238284150NA1Texas City 34th St. C620
UH Moody Tower C6951 N81685766453833292827382319252124302425262633253951NA1UH Moody Tower C695
U of H-Sugarland C6961 N69625361454031282525442817221722332323242534243447NA1U of H-Sugarland C696
UH Coastal Center C6971 N61555256453726212121352017191721211617182326172534NA1UH Coastal Center C697
UH WG Jones Forest C6981 N70816566473838343532322222362428283733352933294246NA1UH WG Jones Forest C698
UH West Liberty C6991 N64736166473934313127342623302827282727282938253951NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 170745659453628252423352717241921232022202231243439NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 165626056464229272627372520252125272022212230243638NA1Lake Jackson C1016
Baytown Garth C1017171756066534534323128423424302727302727282938283849NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X183180686866534635302829443529312729272524253439284247NA1Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C23274775550424035303827332524332829423733383132333528NA2San Antonio Northwest C23
Camp Bullis C58178755646414034273728372727353031413933372931323525NA1Camp Bullis C58
Calaveras Lake C59168665147403831323228322828362727403129303229273222NA1Calaveras Lake C59
Elm Creek Elementary C5011 N62665044383632293327282424303028373329303228273425NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N767454454038332737273326273329304038333626NVNANANANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N7571554642403128372734NVNANANANANANANANANANANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N65655148423830313127352327292427412926292627323323NA1New Braunfels Airport C504
City of Garden Ridge C5051 N73715548424032293427352426322629403226312829333324NA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N61615048413629313027292326282527392927302529293426NA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N67675247423932313328322729382826383129303129303123NA1Heritage Middle School C622
CPS Pecan Valley C6781 N62634741363427252924292122312325352826262625263021NA1CPS Pecan Valley C678
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4272555452443832NVNANANANV28222827282928NVNV27354328NA2Corpus Christi West C4
Corpus Christi Tuloso C21174545251433831312829363423222726272626262927334027NA1Corpus Christi Tuloso C21
Victoria C8717260565446392927272938322620292338NV25252429304032NA1Victoria C87
Inez C6091 N72615856424030282930373223222924362425242328274030NA1Inez C609
Coleto C6241 N69585654454132333133403530273428422829292833334436NA1Coleto C624
Aransas Pass C6591 N73556054463628272830383728NV32262829282829NANANANANA1Aransas Pass C659
Holly Road C6601 N65495047393227252323333123172321222322222220283722NA1Holly Road C660
Violet C6641 N69504645373326262423323324182622242322202219273420NA1Violet C664
Ingleside C6851 N63475046393227262526353426203024252625252723333925NA1Ingleside C685
Odem C6861 N70525049413529282625343324202823242423232220283623NA1Odem C686
Cuero C16021 N65605351423629292828243020212623382424253029273935NA1Cuero C1602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143162494142343130303426253120222526292621262428343024NA1Mission C43/AP143
Brownsville C80/AGP1801534947483834302827262423NV222727272627262428303324NA1Brownsville C80/AGP180
Harlingen Teege C1023156534546353529302928242621242325292924252530283125NA1Harlingen Teege C1023
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244154533634302832333830232519222528282829302930293026NA1Laredo 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.