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Peak Daily One-Hour Ozone Averages for May 2017

The table below lists the peak daily one-hour ozone concentrations measured in May 2017 in each community where the TCEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2596661486079665448415855796565466343474352612Ft. Worth Northwest C13/AH302
Keller C172677066505983696050475855696768546144484748682Keller C17
Frisco C31/C6801806959505979706656505949606970586247444745521Frisco C31/C680
Midlothian OFW C52/A1371617659536470665947515054756360505742475447501Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571657366515777796756466051607475546849453744561Denton Airport South C56/A163/X157
Arlington Municipal Airport C611596955465672595340594749805955475235433943481Arlington Municipal Airport C61
Dallas North No.2 C63/C6791736657505988696248475751686666576146454742511Dallas North No.2 C63/C679
Rockwall Heath C691726154495975675444464647546555585046394043471Rockwall Heath C69
Grapevine Fairway C70/A301/X1821666963495676706049475949677065546143495046571Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711605953516269705547473951546962605047394942511Kaufman C71/A304/X071
Granbury C73/C6811586650506066665249426155706561456948444155551Granbury C73/C681
Eagle Mountain Lake C75 1636866516175746049456258776973496847514447711Eagle Mountain Lake C75
Parker County C761556448485564645848435753636260446447463848621Parker County C76
Cleburne Airport C77/C6821697467566772716750496060777069496547434852541Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3776561515990706149495148756564585743434446533Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021635751475672635544454346725756525138414242471Dallas Executive Airport C402
Greenville C1006/A1981836658526074695951434448575760515243334348441Greenville C1006/A198
Pilot Point C10321597562505972696859465748567372556847423844491Pilot Point C1032
Italy C1044/A3231657253546769666245494255596359475240404941511Italy C1044/A323
Corsicana Airport C10511667751567072736050533855587061664652495244481Corsicana Airport C1051
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442606255495663636249504351535556574232324734422Longview C19/A127/C644
Tyler Airport Relocated C821716058495767645948434748645155525236304639481Tyler Airport Relocated C82
Karnack C85/AFHP3031626253495466676351464049485856574034285529281Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X1512595358546151495753576069645547545254548170682El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591624959505445464847545859575445525151487468651Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1625858516049495354586160605751565658608673731Chamizal C41/AH126
Socorro Hueco C49/F3121535560485047474749526256555343515050486762711Socorro Hueco C49/F312
Skyline Park C721565658536351485453575868646155575557586260701Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N626258555856534850656663625954646253515253573BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141585255474846464651545956555251535251506660691Ivanhoe C414
AreaMonitoring SitePOCMay 2017POCMonitoring Site
12345678910111213141516171819202122
Waco
Waco Mazanec C10371756854546476715746474658606558505040394447471Waco Mazanec C1037
Temple Georgia C10451786755546479755444464161686757495543374751531Temple Georgia C1045
Killeen Skylark Field C10471667452516174755044464660617062465943404446491Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2017POCMonitoring Site
12345678910111213141516171819202122
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2646658505366705849483761468858543431272631332Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412626352464968655746473552436255503727272525282West Orange C9/A141
Port Arthur West C28/A128/A2281637055525471666153513962507456543430272430371Port Arthur West C28/A128/A228
Hamshire C64/C6541616651505369675853493562485857543632282732381Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541667459545770696555534263666158563729292729391SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C6431626858515468655953493862487658553530292831371SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1626757495269676053514162457859563731302931371Nederland High School C1035
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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Austin
Austin Northwest C3/A3222736451505977724641404460666558445341363843412Austin Northwest C3/A322
Audubon C381676449485575734643413859636657446742373542381Audubon C38
Fayette County C6012 N626351536472725141483761656356503634293336432Fayette County C601
Dripping Springs School C6141 N686350495471724541423957646656435842373740391Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N525246425155614033394055585549423433283339341CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N727052505885735046474661657165486146393845451CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N625444435062643935354054625958395236343438371Gorzycki Middle School C1603
Lockhart C16041 N646652526466774938444261736260453635343343381Lockhart C1604
St. Edwards University C16051 N6254464551646539NANANANA625649374235303439371St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N656053485465714635424658696252433837343441381CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N725948485672674638424560626152454638334446431CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162627354515894705946453563507360523634253436292Houston East C1/G316
Houston Aldine C8/AF108/X150 2677549556080746149493866528168573740294138322Houston Aldine C8/AF108/X150
Channelview C15/AH115 3626752546289665445433365495756513427222533333Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542587550546071765846504159538967584137324129352Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391NANA385562100665847473366536254513531222934301Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451587154566483706253503675575956533729252833371Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1606350556079655143463664655856533631262842311Houston Bayland Park C53/A146
Conroe Relocated C78/A3211668745576670816552564760526392685351385333391Conroe Relocated C78/A321
Manvel Croix Park C841626655616787705748503774766160584135283038381Manvel Croix Park C84
Clinton C403/C304/AH113 3546950536189705747443664546753473428233038323Clinton C403/C304/AH113
Houston North Wayside C4051566950525682696444453560527559503533253336301Houston North Wayside C405
Houston Monroe C4061515948505581585040423062535546453424202128281Houston Monroe C406
Lang C4082576349515473705446453561587559533634263135292Lang C408
Houston Croquet C4092576150555977645144453665675554523630252835322Houston Croquet C409
Houston Westhollow C4101576250555976655143453962606054533629242842321Houston Westhollow C410
Park Place C4161546349495483645241433360536049483428222735291Park Place C416
Sheldon C5511 N454538414455454035353044384342332926242728281Sheldon C551
Baytown Wetlands Center C5521 N475538415073555143392550404443422718151619231Baytown Wetlands Center C552
Crosby Library C5531 N736757616590725849513863535862554234283140331Crosby Library C553
West Houston C5541 N586750555973695244474060586959553832273542311West Houston C554
La Porte Sylvan Beach C5561 N21231221252925252017102517222122148131315171La Porte Sylvan Beach C556
Mercer Arboretum C5571 N475341434551544644423646415751423839343829321Mercer Arboretum C557
Tom Bass C5581 N515545505374584840403160575049463224202028261Tom Bass C558
Katy Park C5591 N495744505365594638393150495349423027222331311Katy Park C559
Atascocita C5601 N29301922243230242019132116303120151411141191Atascocita C560
Meyer Park C5611 N435933394352554533362842396550412630253323261Meyer Park C561
Huffman Wolf Road C5631 N322625272631312524292624282730282623242325261Huffman Wolf Road C563
Clear Brook High School C5701 N566448556284645645483366635751493527222333331Clear Brook High School C570
Clear Creek High School C5711 N525544566572624539402571625545423023181923241Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N627350556199675847473467536960503234253235321HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N616455556192685747493564515561553630252736421Wallisville Road C617
Danciger C618 1 N535740555972644941423364675350503727232333281Danciger C618
Texas City 34th St. C620 1 N677153617077706556523979576158573632272834401Texas City 34th St. C620
UH Moody Tower C6951 N607152566189705845483867596757553831252944321UH Moody Tower C695
U of H-Sugarland C6961 N596552576276694538494064706062533735272539361U of H-Sugarland C696
UH Coastal Center C6971 N596453586871666053503575685454533828252434411UH Coastal Center C697
UH WG Jones Forest C6981 N658745596771887058554562557586685053395831381UH WG Jones Forest C698
UH West Liberty C6991 N7360385157816952424735584549575235292325NANA1UH West Liberty C699
Lake Jackson C1016 1596642586171695348503665785656563930262634321Lake Jackson C1016
Baytown Garth C10171636760576296706152543867515461543729222436401Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831727456647776766862574185646261634233283240481Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N566540566069685447473464685255513328262433331Oyster Creek C1607
AreaMonitoring SitePOCMay 2017POCMonitoring Site
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San Antonio
San Antonio Northwest C232616351515972814645404056706753395842363136392San Antonio Northwest C23
Camp Bullis C58 1616450495572764439424260647459425943393335401Camp Bullis C58
Calaveras Lake C591596048486264724439414260706551424138343040391Calaveras Lake C59
Elm Creek Elementary C5011 N606351526264764541424363896751415741342834391Elm Creek Elementary C501
Fair Oaks Ranch C5021 N596450485372754341444157607258415443383133361Fair Oaks Ranch C502
Bulverde Elementary C5031 N606248475172714141413956626957385242353632361Bulverde Elementary C503
New Braunfels Airport C5041 N626153475262704334414557666255413736313740341New Braunfels Airport C504
City of Garden Ridge C5051 N626350505472734335414359646554405037343536341City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N596050465061744435424456676352423736313236311Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N636455526573754442434461736653444338353139381Heritage Middle School C622
CPS Pecan Valley C6781 N464236384955573427303346615341363437332733351CPS Pecan Valley C678
AreaMonitoring SitePOCMay 2017POCMonitoring Site
12345678910111213141516171819202122
Corpus Christi-Victoria
Corpus Christi West C42605742546064674743453165626053483929242522292Corpus Christi West C4
Corpus Christi Tuloso C211625941556066744844453068646253473930252723331Corpus Christi Tuloso C21
Victoria C871596142546967714942493568655854513730273330341Victoria C87
Inez C6091 N606341546265675142473469656153503528252930341Inez C609
Holly Road C6601 NNANANANANANANANANANANANANANANA524733282925301Holly Road C660
Violet C6641 N545240525658654439402665705648433624212116271Violet C664
Ingleside C6851 N616045506268685246493362635956534429272622261Ingleside C685
AreaMonitoring SitePOCMay 2017POCMonitoring Site
12345678910111213141516171819202122
Lower Rio Grande Valley
Mission C43/AP1431615334525455474041393853615543374333343328371Mission C43/AP143
Brownsville C80/AGP1801615529615762514544423046575844433330262622231Brownsville C80/AGP180
Harlingen Teege C10231675934616069524443443345596146423535333024281Harlingen Teege C1023
AreaMonitoring SitePOCMay 2017POCMonitoring Site
12345678910111213141516171819202122
Laredo
Laredo Vidaurri C44/AFGP144/P2441525261485951474042385051544739333736343330311Laredo Vidaurri C44/AFGP144/P244
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.