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Daily Maximum Eight-Hour Ozone Averages for May 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 2018 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 2018POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 239323140576764615453454238354159835440NVNA2Ft. Worth Northwest C13/AH302
Keller C17242343042576770635656464440384457855741NVNA2Keller C17
Midlothian OFW C52/A137142333137606268605454424137363968634940NVNA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X157141333338546168655757NV4541424752636443NVNA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C61143322834586768635756454237343965694940NVNA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679142372835598176686059474539384261665843NVNA1Dallas North No.2 C63/C679
Rockwall Heath C69142332431548176645458454333303757644740NVNA1Rockwall Heath C69
Grapevine Fairway C70/A301/X182141312837576674655857464339374356735842NVNA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071146382937566165635558464236353962574847NVNA1Kaufman C71/A304/X071
Granbury C73/C681138363443566464625655494339353763615139NVNA1Granbury C73/C681
Eagle Mountain Lake C75 142363746586569625757494540384858925843NVNA1Eagle Mountain Lake C75
Parker County C76138363740545862595353464237333955755141NVNA1Parker County C76
Cleburne Airport C77/C682143333239586868665858494540394081635442NVNA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 342352635597971655758454339374062695242NVNA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021433530356173726658584644403837NV675142NVNA1Dallas Executive Airport C402
Greenville C1006/A198146332729506373635557454137354049555241NVNA1Greenville C1006/A198
Pilot Point C1032142363337596472716261494743454351567143NVNA1Pilot Point C1032
Italy C1044/A323140312840635771635556434134323772574339NVNA1Italy C1044/A323
Corsicana Airport C1051147402441625464665858464540394861624649NVNA1Corsicana Airport C1051
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644248353330506253615660453933375257604842NVNA2Longview C19/A127/C644
Tyler Airport Relocated C82151383336515760NV5762544134345053564647NVNA1Tyler Airport Relocated C82
Karnack C85/AFHP303146343228425159615758464236404958455141NVNA1Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151254535663666456475646433532334249526565NVNA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159149485258595652425943383231304053465762NVNA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 157576061646358486049463835354553556768NVNA1Chamizal C41/AH126
Socorro Hueco C49/F312153515356585653476251403330314247475762NVNA1Socorro Hueco C49/F312
Skyline Park C72157605962646560496050454036364552607066NVNA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N65394452596159565455494645474850535165NVNA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414155555758605959486149423633354553NVNANANANA1Ivanhoe C414
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Waco
Waco Mazanec C1037141322438595669585355444128343759604441NVNA1Waco Mazanec C1037
Temple Georgia C1045139323242586575615756464237364063614739NVNA1Temple Georgia C1045
Killeen Skylark Field C1047139343444586681716363534742444556675540NVNA1Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 246403935384761635859454033496468614136NVNA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A14125141424435476473666048453358707359NVNANANA2West Orange C9/A141
Port Arthur West C28/A128/A22815141413640496061585848403249696370NV39NVNA1Port Arthur West C28/A128/A228
Hamshire C64/C654149403936385060646358483829506065774037NVNA1Hamshire C64/C654
SETRPC Port Arthur C6281 N53413937405666625859494233507262774340NVNA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654154414140446161676060514534476366514241NVNA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N52434147374658726966524533706872515143NVNA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643153424137404962646162494233527266674339NVNA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 15245413837526466NV56443831486764624239NVNA1Nederland High School C1035
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Austin
Austin Northwest C3/A322235303239556672565554444036364260554635NVNA2Austin Northwest C3/A322
Audubon C38132293436526470605656464238374452584936NVNA1Audubon C38
Fayette County C6012 N39323331526262545652413833384647474036NVNA2Fayette County C601
Dripping Springs School C6141 N32303539536471595556484239374558564936NVNA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N28242426445250454846363328293343454031NVNA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N36323641546577625958484339404866635238NVNA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N34293241536671575552444036344160534635NVNA1Gorzycki Middle School C1603
Lockhart C16041 N32283033526863525250423934334154504333NVNA1Lockhart C1604
St. Edwards University C16051 N32272836536466535151413734313660494332NVNA1St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N33293334546668555353443935343963504533NVNA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N37293140566871565553423933343970554435NVNA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316241383328415284686257423738536562774538NVNA2Houston East C1/G316
Houston Aldine C8/AF108/X150 2403934294653886966614441435769NV754740NVNA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 340313129425181656054413630477364724438NVNA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X154242413835465465666562464343556853564844NVNA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391463835364557846761604339365061NV664437NVNA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45144353337445569605556413730435350493834NVNA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14035322949647861605642NVNANV5954614136NVNA1Houston Bayland Park C53/A146
Conroe Relocated C78/A321144474532324457717573575347758554596555NVNA1Conroe Relocated C78/A321
Manvel Croix Park C84140NV313052686562605439343043NV53544135NVNA1Manvel Croix Park C84
Clinton C403/C304/AH113 339312929475373585249353437445448603834NVNA3Clinton C403/C304/AH113
Houston North Wayside C405138342926435179575650373538486056663834NVNA1Houston North Wayside C405
Houston Monroe C406138323127435566575249363130415151533832NVNA1Houston Monroe C406
Lang C408239353229445773615955403736496454604437NVNA2Lang C408
Houston Croquet C409238333128466065565551393330415350563834NVNA2Houston Croquet C409
Houston Westhollow C4101NANV3331486169636058403834476052554338NVNA1Houston Westhollow C410
Park Place C416143353332485877625956403736485854624136NVNA1Park Place C416
Baytown Wetlands Center C5521 N33222123293862494444342719345042462625NVNA1Baytown Wetlands Center C552
Crosby Library C5531 N45373636385082726862474034608272785241NVNA1Crosby Library C553
La Porte Sylvan Beach C5561 N26NANVNANANANANV4343332922333640372929NVNA1La Porte Sylvan Beach C556
Tom Bass C5581 N35292825314155535249342925394242463629NVNA1Tom Bass C558
Katy Park C5591 N32282426414851504944262325364339423328NVNA1Katy Park C559
Atascocita C5601 NNANV2723334685696562403634597662724435NVNA1Atascocita C560
Meyer Park C5611 N27252421293646454440302830374637383427NVNA1Meyer Park C561
Bunker Hill Village C5621 N30282620395059514945333027385045493729NVNA1Bunker Hill Village C562
Huffman Wolf Road C5631 NNANANANANANANANANANANANANANANANANANV129179NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N40332827425179606453363534486056704033NVNA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N47373736415388716563494132558167824641NVNA1Wallisville Road C617
Texas City 34th St. C620 1 N50393736515574605758464332434946443634NVNA1Texas City 34th St. C620
UH Moody Tower C6951 N44373635526484676560444138546260694539NVNA1UH Moody Tower C695
UH WG Jones Forest C6981 N46494334495366747370525149707755586050NVNA1UH WG Jones Forest C698
UH West Liberty C6991 N40333434354468686357443628547267654938NVNA1UH West Liberty C699
Lynchburg Ferry C1015/A165 145353331294683676057443731467060674639NVNA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 144373335596361595754423432404747443936NVNA1Lake Jackson C1016
Baytown Garth C10171NV393838405188716563504233578168854742NVNA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831534341415060835965635449374645NV414343NVNA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N45363435646362585655443930414644413837NVNA1Oyster Creek C1607
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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San Antonio
San Antonio Northwest C23232303738516675585555NANANANV4458584838NVNA2San Antonio Northwest C23
Camp Bullis C58 133303841526283615858494543414960645238NVNA1Camp Bullis C58
Calaveras Lake C59133313337587171575556464239374147524637NVNA1Calaveras Lake C59
Elm Creek Elementary C5011 N32293236546766525151433838343646494436NVNA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N33303640495879605857494542424747615137NVNA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N29293638495878605556484341384652585136NVNA1Bulverde Elementary C503
New Braunfels Airport C5041 N29273034486167525051423733323557454131NVNA1New Braunfels Airport C504
City of Garden Ridge C5051 N29293237536675575454454139364173544536NVNA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N30283131516363535252423833323851474332NVNA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N30283034537368525253413937353852494234NVNA1Heritage Middle School C622
CPS Pecan Valley C6781 N27273130537169544952423736333760494334NVNA1CPS Pecan Valley C678
Government Canyon C16101 N30293438485767545252443938364246554837NVNA1Government Canyon C1610
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4237262524405754474646342521293035353228NVNA2Corpus Christi West C4
Corpus Christi Tuloso C21137272625406056484747322722283337373227NVNA1Corpus Christi Tuloso C21
Victoria C87137292730466462515249353225323839443628NVNA1Victoria C87
Holly Road C6601 N38252526425855464948362524333337373531NVNA1Holly Road C660
Violet C6641 N38272627405855484747332822283134363128NVNA1Violet C664
Ingleside C6851 N41282728436358515252382721363539373731NVNA1Ingleside C685
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP14312928262633566045NV41NV3836303339423833NVNA1Mission C43/AP143
Harlingen Teege C1023130312731315354524949443631313340403630NVNA1Harlingen Teege C1023
AreaMonitoring SitePOCMay 2018POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441NANANANANANANANV4444424037303338404335NVNA1Laredo 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
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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.