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Peak Daily One-Hour Ozone Averages for May 2015

The table below lists the peak daily one-hour ozone concentrations measured in May 2015 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 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 279706052484158384437414536282836435926433227282Ft. Worth Northwest C13/AH302
Keller C17286685451493951353338364231302733446729402925262Keller C17
Frisco C31/C680176846059524659493745384435403136535931522933321Frisco C31/C680
Midlothian OFW C52/A137164675152453836333136463427323332414030492732291Midlothian OFW C52/A137
Denton Airport South C56/A163/X157189816561514854473643424830383237557634473433361Denton Airport South C56/A163/X157
Arlington Municipal Airport C61165645250453550303039484129273231414326442733251Arlington Municipal Airport C61
Dallas North No.2 C63/C679171755451474154393339403826362634476033472730301Dallas North No.2 C63/C679
Rockwall Heath C69173746160514763463843404228373037484632543041311Rockwall Heath C69
Grapevine Fairway C70/A301/X182187725855473956383044434333312733456830493028291Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071170685654424255473637353327352535393830452338291Kaufman C71/A304/X071
Granbury C73/C681174705353544152414841454338303243474138363522281Granbury C73/C681
Eagle Mountain Lake C75 186655751463950363436414434292934436829413226271Eagle Mountain Lake C75
Parker County C76182715658604358434648475237323540486735453725321Parker County C76
Cleburne Airport C77/C682168664951493546373739493539292835443933463127271Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 377705354463859363241434424272434435231472836303Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402166634749413452272735403723293530394127442732271Dallas Executive Airport C402
Greenville C1006/A198162656155444248463140353827342933504130472636261Greenville C1006/A198
Pilot Point C10321688564615048534823NANA3631423237576032513634321Pilot Point C1032
Italy C1044/A323169675356484037353337523530342534413736452930301Italy C1044/A323
Corsicana Airport C1051166675657424345373440383228342531413834352533321Corsicana Airport C1051
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644279645966464433353331433032322731444634472344312Longview C19/A127/C644
Tyler Airport Relocated C82165655664464133383233422933352637384126422246261Tyler Airport Relocated C82
Karnack C85/AFHP303160646170514035523025493231332528354533452346371Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151260595956505155596663744756434258574953633559612El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159157535945424649475957654153363352544148643348541Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 161566251505054566764703756424160574556672957631Chamizal C41/AH126
Socorro Hueco C49/F312161566750485354556162684663423858564849673358591Socorro Hueco C49/F312
Skyline Park C72162636758515455606462724858434357575258783663621Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N61595846575055386768544952574548615259422945383BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414160546448464951525857584255403749554251702854541Ivanhoe C414
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Waco
Waco Mazanec C1037171695358514336343532513332322636514135432933311Waco Mazanec C1037
Temple Georgia C1045177765677524135293534453136343037494335372843321Temple Georgia C1045
Killeen Skylark Field C1047171755872504436303644442932362739493731393238301Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 271696267545137313029463523292425243128223040262Beaumont-Downtown C2/A112/C2002
West Orange C9/A141262725862494336302627413823272524283325233337262West Orange C9/A141
Port Arthur West C28/A128/A228173665761524637302727473528312725263527213341271Port Arthur West C28/A128/A228
Hamshire C64/C654165735867534738312730484023292626333627233340261Hamshire C64/C654
SETRPC Port Arthur C6281 N75726164514336312928453225302725263626243840281SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654163715660484337312826412828272438283125223741281SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N63686167514634322726413023282424253329373252291SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643164594855454134262322393122242222222923192732241SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 171716064534939312928474328312627283728243542301Nederland High School C1035
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Austin
Austin Northwest C3/A322281765350473934273229452933312933493731423735302Austin Northwest C3/A322
Audubon C38179805653504036323431433037332835464232433029311Audubon C38
Fayette County C6012 N76665765484033353232382927312631384027312843392Fayette County C601
Dripping Springs School C6141 N75765550514135373933463638353340624034374734351Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N7373595750423464NA37422838393139494036433640381CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N84785856474537343633373035382938494433444034291CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N78795652494134333431463139343136493731354335321Gorzycki Middle School C1603
Lockhart C16041 N74685552474134403431402932333435503631403836431Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N73755248454132393531433135373435483632354436371CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N76745456453933313430372737362833563429344441341CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316286886473514934293029432930322526312432282238292Houston East C1/G316
Houston Aldine C8/AF108/X150 283876979514836303230442729362825312730382944272Houston Aldine C8/AF108/X150
Channelview C15/AH115 3731105761504830242626392925302324292325212636263Channelview C15/AH115
Northwest Harris Co. C26/A110/X154267745677464738343332392327342829314031373153282Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239190696065474430262525433328302323312427232834291Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45184856467514934302827493629302530382727263337351Seabrook Friendship Park C45
Houston Bayland Park C53/A146 18869586950NA28272627452930252022332023272938241Houston Bayland Park C53/A146
Conroe Relocated C78/A3211721017268514946474138393131513636314637543533361Conroe Relocated C78/A321
Manvel Croix Park C84190686076535136302930533834292427382428303238271Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANANANANANA242827443428251925332426243037293Clinton C403/C304/AH113
Houston North Wayside C405171705764434329252625362224231721251927272533231Houston North Wayside C405
Houston Monroe C406179615363463632262525423630232123312124202735261Houston Monroe C406
Lang C408283765879504936313130392828312725292729372844302Lang C408
Houston Croquet C409286665770494934292930463632282426382529313239272Houston Croquet C409
Houston Westhollow C410177695773505034323032473530312427373028353444301Houston Westhollow C410
Houston Texas Avenue C411179665267454331262627372926232122332225262834271Houston Texas Avenue C411
Park Place C416187705770504734292929453632282626342529262938301Park Place C416
Sheldon C5511 N61805458434027252626352422312223252324222535261Sheldon C551
Baytown Wetlands Center C5521 NNANANANANANA33302930424530322728342828273240271Baytown Wetlands Center C552
Crosby Library C5531 N63865563444231292925271820272221222421232539241Crosby Library C553
West Houston C5541 N76695682484932292929363125282022292626303043251West Houston C554
Mercer Arboretum C5571 N62826063434233303030311825362323243027302537251Mercer Arboretum C557
Tom Bass C5581 N75595060444329242323403327221921291821222531231Tom Bass C558
Katy Park C5591 N64635071434430272437403119301819302723242941221Katy Park C559
Atascocita C5601 N61805557434229292826352224292623242428322538281Atascocita C560
Meyer Park C5611 N61685264433933302927331923302523242827342440221Meyer Park C561
Bunker Hill Village C5621 N72635165434429262526382623241923252024272739211Bunker Hill Village C562
Huffman Wolf Road C5631 N61815660433831302826322023302625222421292539201Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N89906772504932272627453630322423302328253040331HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N68705258484533292827413826302725312526262739261Wallisville Road C617
Danciger C618 1 N72656162494933292930463332262528442626232735261Danciger C618
Mustang Bayou C619 1 N71666165514834302728463230292528342225223120NA1Mustang Bayou C619
Texas City 34th St. C620 1 N88877075585038343332553731342830422829273443391Texas City 34th St. C620
UH Moody Tower C6951 N90735873494634313031443723292727392629303142301UH Moody Tower C695
U of H-Sugarland C6961 N75645570474832312729493825272023372627273237251U of H-Sugarland C696
UH Coastal Center C6971 N66575462484431232322382419211923271818192630251UH Coastal Center C697
UH WG Jones Forest C6981 N741007070504844403837362832483532304540433237341UH WG Jones Forest C698
UH West Liberty C6991 N67836468494636343430393132343230353130333448271UH West Liberty C699
Lynchburg Ferry C1015/A165 179995965494430272826433929302225272226242435271Lynchburg Ferry C1015/A165
Lake Jackson C1016 168636261494834282729473026272329362324232834251Lake Jackson C1016
Baytown Garth C1017180836370565138353231474627343129362930303245301Baytown Garth C1017
Galveston 99th St. C1034/A320/X183192707070575138323230543830342830332726274142391Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C23278845752524138364031383832404034484135424338392San Antonio Northwest C23
Camp Bullis C58186875948464436344132483735384136484636454338351Camp Bullis C58
Calaveras Lake C59176735348484032383532363234493232443432334435361Calaveras Lake C59
Elm Creek Elementary C5011 N66745246453835353631343030353933413531334132321Elm Creek Elementary C501
Fair Oaks Ranch C5021 N83835746444336294031383533354235454536434322NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N838057494843353140314037NANANANANANANANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N71725350454034403328383031402934453429313831371New Braunfels Airport C504
City of Garden Ridge C5051 N78815751484234393631383533403334443528334834361City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N64675350443933413330332729362833433329324232321Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N71735549494234373732363234463331423532344135411Heritage Middle School C622
CPS Pecan Valley C6781 N65694843423629333229332927412931393029304130341CPS Pecan Valley C678
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C427858585545403334NANANA2435243431333331303329322Corpus Christi West C4
Corpus Christi Tuloso C21187585853464031343132344029243129313127273029331Corpus Christi Tuloso C21
Victoria C87178625956524232302931473830233328462928282731281Victoria C87
Inez C6091 N79666059474334303032484029233427432627272930271Inez C609
Coleto C6241 N76605957484335373635474335313930503030323136311Coleto C624
Aransas Pass C6591 N8261645650393229303140423528353031293031313NA1Aransas Pass C659
Holly Road C6601 N71515350403428302625343529182925272625242422241Holly Road C660
Violet C6641 N74535048403426282727313632203127272824222522271Violet C664
Ingleside C6851 N70535549413429282728343733213429282728273025281Ingleside C685
Odem C6861 N77575550423730302828303730223028262925252922271Odem C686
Cuero C16021 N67635452463931323230293524263228432626283631281Cuero C1602
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143168524345373333333731273822232829312926283232331Mission C43/AP143
Brownsville C80/AGP180155514850403631353130262921222431333129312930271Brownsville C80/AGP180
Harlingen Teege C1023158574749373734333130253124272929333228283032281Harlingen Teege C1023
AreaMonitoring SitePOCMay 2015POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244155543836343033374031273021262731323432323632321Laredo 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 - 0.059
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.