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Peak Daily One-Hour Ozone Averages for July 2021

The table below lists the peak daily one-hour ozone concentrations measured in July 2021 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 SitePOCJuly 2021POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 255566358485373553432578133323634313856537761373546658772872Ft. Worth Northwest C13/AH302
Keller C17256375961485471553330577739323537304051486363363948679377962Keller C17
Frisco C31/C680172394753504970663634576351393844344451496167415660747161731Frisco C31/C680
Midlothian OFW C52/A137146525048434145383131515831323235292655546860374037556255691Midlothian OFW C52/A137
Denton Airport South C56/A163/X157153374760606581744232567049383848384349496071395255777786971Denton Airport South C56/A163/X157
Arlington Municipal Airport C61142555351404458423132656433313132292961557759363440616364691Arlington Municipal Airport C61
Dallas North No.2 C63/C679171394557494964553432596539313140293552455662374655758171801Dallas North No.2 C63/C679
Rockwall Heath C69164334148474043443029505234302832223640445651293340545255571Rockwall Heath C69
Grapevine Fairway C70/A301/X182163354759505379533029527337313033253848466058334150699680971Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071139344656474336372925585427303126242436415451253030395053561Kaufman C71/A304/X071
Granbury C73/C681140523746434050383030484833303228253049538252313032435452601Granbury C73/C681
Eagle Mountain Lake C75 1484864675456806240306279313136352834514965633333445490781061Eagle Mountain Lake C75
Parker County C76143475659514857483228505929303031243451466653313436416562721Parker County C76
Cleburne Airport C77/C682144684450534751413934515937354237352962678463423938466157661Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 37055627560596355343467803933324231356457736839NANA632954743Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402154505362524750443433695833333239293061527058393847577762801Dallas Executive Airport C402
Greenville C1006/A198165304457494141433131525235302929213640465750283136485155531Greenville C1006/A198
Pilot Point C1032148374753545266723935626557434149424550496096446172737063651Pilot Point C1032
Italy C1044/A323144464349484142343329444731342942253250546056334237384954541Italy C1044/A323
Corsicana Airport C1051139414548434353363227585537393527332536415656293143465451561Corsicana Airport C1051
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644239395264514651362922634433272522192445404746232631434772702Longview C19/A127/C644
Tyler Airport Relocated C82136375064575738383020604729222527183841474853263530394046531Tyler Airport Relocated C82
Karnack C85/AFHP303147354751403740412927685357332926423638184445373549454249471Karnack C85/AFHP303
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252664483556886556991805665585261606260736676767263786610173562El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X15915740775071644548705843504451575656405457616262NANA596046381Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1614081536772515983705258474958586250565461686759856580NA451Chamizal C41/AH126
Socorro Hueco C49/F312160457770967159597264586459636469955162677175777190806155541Socorro Hueco C49/F312
Skyline Park C72153416354696852557065525957596264655254616677706281698262521Skyline Park C72
Ivanhoe C414/F5141544569618169NA446052475149545960654221NA5768696374715946451Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG221155426252607153578279497457495757605150667266676065619067521Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Waco
Waco Mazanec C1037150423246434839363324414029312635253544465155304039505457591Waco Mazanec C1037
Temple Georgia C1045145473337363739343128394532283037273448565165324243435161591Temple Georgia C1045
Killeen Skylark Field C1047155513840334240383032334245384541383842555575434358475562621Killeen Skylark Field C1047
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 251453951412542222220332837272223222330336533233234544860492Beaumont-Downtown C2/A112/C2002
West Orange C9/A141235663955372728232026334327242223242229295346215055646257502West Orange C9/A141
Port Arthur West C28/A128/A228140444041372529242822322925282525242033355831223140665574531Port Arthur West C28/A128/A228
Hamshire C64/C654145543458302632232722303326292424211827395731213154746263681Hamshire C64/C654
SETRPC Port Arthur C6281 N37504240372528222422352630282824272234375540243041695478531SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654133344240342527273126222722272527262127415734232231645061551SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N47493461503842263032454040303130353133355547365029475145471SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643141463842342539242521292831262323222229346033212741645370641SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 146413741332438212120282531232119232226325630202732NA5765641Nederland High School C1035
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Austin
Austin North Hills Drive C3/A322251554031283933352623273627322925262929574755293149554761682Austin North Hills Drive C3/A322
Audubon C38145523532262828302327273231NA2418212217484548252640505265601Audubon C38
Dripping Springs School C6141 N35484131283229332525273931282623252923505453282941565265701Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N50462631202624252221242729292724242625474151262946505355511CAPCOG Lake Georgetown C690
Lockhart C16041 N353634262224242622262432246NANANANANANANANANANANANANANANA1Lockhart C1604
St. Edwards University C16051 N36413726213026312223233223282421232528524241242631453851641St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N29394032233225342623223624272426262626434133242829274659521CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N35413631193328332321223226292122232638454440252630365156591CAPCOG Elgin C1613
CAPCOG East Austin C16191 N34393322202723292022192820252018202130463840222427433649601CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N49503130232826272424243023282522232625474352252844554854551CAPCOG Round Rock Brushy Creek W C1620
CAPCOG San Marcos Staples Road C16751 N34423833252726292526253129292622242846675239272834414550651CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162607828573632412424182647412928222833383870402639571027062672Houston East C1/G316
Houston Aldine C8/AF108/X150 285833160354144302226344859413430433939457749NANA51675950582Houston Aldine C8/AF108/X150
Channelview C15/AH115 3519129543532442319203436293126263635444276483151881029353563Channelview C15/AH115
Northwest Harris Co. C26/A110/X154272411939385141262823283659393123333125425637242929355363612Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391455943533333382626202231363027252929334379342730441306876671Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45134423253312328242716182226302118272626355927213435934751491Seabrook Friendship Park C45
Houston Bayland Park C53/A146 168543867343032312720223333353120282930517035244053625693801Houston Bayland Park C53/A146
Conroe Relocated C78/A321157522732394854232733383246314831564127415842335734515756521Conroe Relocated C78/A321
Manvel Croix Park C84141432553272630252120212822292820232228585530212530565591791Manvel Croix Park C84
Clinton C403/C304/AH113 349573759382533241918215234302117232525436029203041975872693Clinton C403/C304/AH113
Houston North Wayside C405/C1033160712447343235241719254652292819323531396236254056686761631Houston North Wayside C405/C1033
Houston Monroe C406155494010NA2328262318192631282219212328436130212439824972651Houston Monroe C406
Lang C408277602946383437252120194448372922283129396636303938627273662Lang C408
Houston Croquet C409256523967292730282520202529303019262731516131202641565298802Houston Croquet C409
Houston Westhollow C410/C3003148453356363034282519212638352721302724467332202831415383841Houston Westhollow C410/C3003
Park Place C416162614173333136292420242837342720272734486935233146906297811Park Place C416
Houston Harvard Street C417185663371503942373127275148413524313538518345284458827677821Houston Harvard Street C417
Sheldon C5511 N467018392611422NANANANANANANANANANANANANANANANANANANANANA1Sheldon C551
Baytown Wetlands Center C5521 N3168294224NA26202016202420222119252331355429203165876957461Baytown Wetlands Center C552
Crosby Library C5531 N46712343312747202023303630302929353740386350376374639645481Crosby Library C553
West Houston C5541 N65553647453642292720204250452918181818181826232831535785741West Houston C554
La Porte Sylvan Beach C5561 N34503448312730252716172124302630282729386133223137945763511La Porte Sylvan Beach C556
Mercer Arboretum C5571 N70602541344745212025333952403726NANANANANANANANANANANANANA1Mercer Arboretum C557
Tom Bass C5581 N47463957292831302420202724302719252331536029212637655384711Tom Bass C558
Katy Park C5591 N51434445382931313024192632363626272828396934293333394978691Katy Park C559
Atascocita C5601 N55592245323649192121242937283225413630356746294863686150521Atascocita C560
Meyer Park C5611 N71492346364240282123254152442921323325416532233734435252481Meyer Park C561
Bunker Hill Village C5621 N70513358343132282118194036332619282825476032273539566281731Bunker Hill Village C562
Huffman Wolf Road C5631 N37582845323450212428323132284034383940405255416053537541471Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N598433593334432521182644403025223131361572412646671098066661HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N40804250342938262525373127252727312935416139295285977656501Wallisville Road C617
Texas City 34th St. C620 1 N45454460333134303124223229372726262638596734222637886274641Texas City 34th St. C620
UH Moody Tower C6951 N71613764312832282519203335312719252434486633202941785876671UH Moody Tower C695
UH WG Jones Forest C6981 NNA48NA554845242630363051404228584027436842314435535566611UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 1348735513329352422192630252923252929332865322735801037861541Lynchburg Ferry C1015/A165
Lake Jackson C1016 132282038221927232219192219242215221720504418181415225661401Lake Jackson C1016
Baytown Garth C10171458846543932402928294236322932303634464467433760911068862581Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831323239432928312829242029232926252322324658381818NANANANA371Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 NNANANANANANANANANANANA3026272521282531376441202838945856551UH Smith Point C1606
Oyster Creek C1607 1 N38413546323037343226253327353126312834636031272329366882601Oyster Creek C1607
UH Launch Trailer C16111 N73623568342934292521223738323121282637517137243247843980691UH Launch Trailer C1611
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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San Antonio
San Antonio Northwest C2325253495037282931252529302828NANANANANANA4539262734384855722San Antonio Northwest C23
Camp Bullis C58 160633443423031352527333834413328313850524950333445606367861Camp Bullis C58
Calaveras Lake C59134364935292728272418212727312321242639604727252626304051561Calaveras Lake C59
Elm Creek Elementary C5011 N35363934293127302621212226262221232532586333242427323151601Elm Creek Elementary C501
Fair Oaks Ranch C5021 N53583333362324292220303529362924273335454345293041495662721Fair Oaks Ranch C502
Bulverde Elementary C5031 N57603835352627312424303428323025283838473743283141586155681Bulverde Elementary C503
New Braunfels Airport C5041 N38393829232125261820243025262221232841604631262733353446581New Braunfels Airport C504
City of Garden Ridge C5051 N41443943272326282321232926282523252647605337222530474650651City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N31383825242227252323232927252521232528504428252634333745551Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N31363932292726272519202624272020242335594727242425294049561Heritage Middle School C622
CPS Pecan Valley C6781 N2927342920191820810162018201614172423474218151620232734411CPS Pecan Valley C678
Government Canyon C16101 N35452935282322251919212324252018192222464336252629334361761Government Canyon C1610
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4224322422273833332929191924211920201920504721191816213439412Corpus Christi West C4
Corpus Christi Tuloso C21125343326233633392728193824191918211821475221181716224539421Corpus Christi Tuloso C21
Victoria C87132423426232636263320192627241918212233535523202423354645421Victoria C87
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP143140402932303345363326252629283121242533394630293221273756431Mission C43/AP143
Harlingen Teege C1023126282429233936382931222629232420262133373124192223292737321Harlingen Teege C1023
AreaMonitoring SitePOCJuly 2021POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P244127262930364637243822283224292823292326604426282830302729NA1Laredo 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
  • 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.