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Peak Daily One-Hour Ozone Averages for September 2018

The table below lists the peak daily one-hour ozone concentrations measured in September 2018 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 SitePOCSeptember 2018POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2403421253034391224171834394646543748572Ft. Worth Northwest C13/AH302
Keller C172604631424446721628293740414441614356622Keller C17
Frisco C31/C6801594231405055773227243535394240536369691Frisco C31/C680
Midlothian OFW C52/A1371464031373746493131282630333242423449521Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571594827464446711828223740513637534861621Denton Airport South C56/A163/X157
Arlington Municipal Airport C611494230383959513029272732333552463748511Arlington Municipal Airport C61
Dallas North No.2 C63/C6791564329394062772229263237444040575765621Dallas North No.2 C63/C679
Rockwall Heath C691423618263936541425152223313130475850481Rockwall Heath C69
Grapevine Fairway C70/A301/X1821594427434753752327263641423539585156601Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711524535344653553329242438434040554350591Kaufman C71/A304/X071
Granbury C73/C6811524336344142552031363737363717NA3348501Granbury C73/C681
Eagle Mountain Lake C75 1645033444142601730283342454940633849531Eagle Mountain Lake C75
Parker County C761544737354249492231353834375239523843331Parker County C76
Cleburne Airport C77/C6821544240414247553333333634383556434254551Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3544427373860662829303036414144584955563Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402154473540446756363331313842NA50594553591Dallas Executive Airport C402
Greenville C1006/A1981473732333647511826223428314140506852471Greenville C1006/A198
Pilot Point C10321584329424647561927253235423439495870811Pilot Point C1032
Italy C1044/A3231463431333646472932322625302433373647501Italy C1044/A323
Corsicana Airport C10511493938NA4257623930383030353047474552671Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Longview C19/A127/C6442433631294956473627202234334546725554442Longview C19/A127/C644
Tyler Airport Relocated C821555131284554513425212746513648655452501Tyler Airport Relocated C82
Karnack C85/AFHP3031363325313440553924202225284042515569481Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252494751516053425175817176685441485047442El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591454249556047394274656468574338373936351Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1494853586152404779747376634936435140371Chamizal C41/AH126
Socorro Hueco C49/F3121434447494439343757564657443935312924331Socorro Hueco C49/F312
Skyline Park C721504951576653445182627874624842444443451Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N454947474337393837393741403531292732393BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414/F5141494651685948414480605970564140383532381Ivanhoe C414/F514
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Waco Mazanec C10371533943394137453433423132343142504752511Waco Mazanec C1037
Temple Georgia C104515144404043414828294132323028394045NANA1Temple Georgia C1045
Killeen Skylark Field C10471524640424446433227423536222840393655511Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2472823313660422330232022282658406262742Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412502728314145493541322423313164447364752West Orange C9/A141
Port Arthur West C28/A128/A2281323125305446252628322625293051366957651Port Arthur West C28/A128/A228
Hamshire C64/C6541413830365340312832323028262756364261551Hamshire C64/C654
SETRPC Port Arthur C6281 N313126306841252730312727283153648572671SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541312926333831233031272729303059498180451SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N42272830316747127322426353254434665771SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431353029285450332730362526282958456963651SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1NANANANA3552392425292121262648416160611Nederland High School C1035
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Austin Northwest C3/A3222494234383946362626272933342530334235362Austin Northwest C3/A322
Audubon C381484135284047392321273133352729314141421Audubon C38
Fayette County C6012 N522825385039262333303338333631303641352Fayette County C601
Dripping Springs School C6141 N463734324050422827293536382829304634401Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N513532334048363326253738322836313630371CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N483934394245412724303033332932343749501CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N484236344246352632303433362833294032381Gorzycki Middle School C1603
Lockhart C16041 N473536363438353121222714121723263732361Lockhart C1604
St. Edwards University C16051 N493631343943343026283132322432294029351St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N453536353639303224243433303126293828361CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N443535373743392922313131312629314637351CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Houston East C1/G31624923152633383026262216262118387469105612Houston East C1/G316
Houston Aldine C8/AF108/X150 245332039496045373822313730255173711061072Houston Aldine C8/AF108/X150
Channelview C15/AH115 33528182744483532402624292520408769128743Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542433223475665432927223661332455494860782Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239136302427493831273237293127284247113115551Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45132292427383128272829282827284648106116521Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1713323394740292938283035322539456463401Houston Bayland Park C53/A146
Conroe Relocated C78/A3211382825323669484728282834NANANANANANA401Conroe Relocated C78/A321
Manvel Croix Park C841402623323330252827282733302636355150421Manvel Croix Park C84
Clinton C403/C304/AH113 3552924264838302829212230272341497989493Clinton C403/C304/AH113
Houston North Wayside C40514024152540372924NANA1431201937645894811Houston North Wayside C405
Houston Monroe C4061342321283434262426232728262633306658401Houston Monroe C406
Lang C4082463217374553293032202434262243506375532Lang C408
Houston Croquet C4092512723324032242735252732302434376253372Houston Croquet C409
Houston Westhollow C4101723323426349282632282735312538465459541Houston Westhollow C410
Park Place C4161472821324541272833272631292737377379461Park Place C416
Baytown Wetlands Center C5521 N141311101918131117141512131719286252271Baytown Wetlands Center C552
Crosby Library C5531 N402821314249394335262628241730543141311Crosby Library C553
La Porte Sylvan Beach C5561 N151211111515141017141313101316216045221La Porte Sylvan Beach C556
Tom Bass C5581 N281610202724181916111422181328264642241Tom Bass C558
Katy Park C5591 N462614323839181421212128231832243337341Katy Park C559
Atascocita C5601 N20151216283528261814152010NANANANANANA1Atascocita C560
Meyer Park C5611 N241912183443232316131728181331332849511Meyer Park C561
Bunker Hill Village C5621 N471912283531232122151825221527374551351Bunker Hill Village C562
Huffman Wolf Road C5631 N191513172129322918161516181421322740381Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N4626223243413429352525372824469075110861HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N403526345350393657393233323248947787611Wallisville Road C617
Danciger C618 1 N381918262923172121212626272327393945271Danciger C618
Texas City 34th St. C620 1 N3629283141342427313332333434524812485541Texas City 34th St. C620
UH Moody Tower C6951 N613422364948293146272936302942408084501UH Moody Tower C695
UH WG Jones Forest C6981 N3929223248634541272829373224404845721141UH WG Jones Forest C698
UH West Liberty C6991 N322419283544414531282530302240564758541UH West Liberty C699
Lynchburg Ferry C1015/A165 138292228434033335540302929294212067107701Lynchburg Ferry C1015/A165
Lake Jackson C1016 1392324313132262625262929312733453147371Lake Jackson C1016
Baytown Garth C10171373324295045373353323132303045927781641Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831373128313829233132303132343343395162451Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N34332731383632344031313333334955129141491UH Smith Point C1606
Oyster Creek C1607 1 N352630313433212826293433333134385450411Oyster Creek C1607
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
San Antonio
San Antonio Northwest C232515241465145342029263541323729284332322San Antonio Northwest C23
Camp Bullis C58 1485172394542372231293740313328305235361Camp Bullis C58
Calaveras Lake C591504132373832353238253836372928304025311Calaveras Lake C59
Elm Creek Elementary C5011 N414736354732322237274637343228263028301Elm Creek Elementary C501
Fair Oaks Ranch C5021 N444441333634331832243232273027285037361Fair Oaks Ranch C502
Bulverde Elementary C5031 N47464133363540172525333126302627413451Bulverde Elementary C503
New Braunfels Airport C5041 N433333343435333031253630293025294329351New Braunfels Airport C504
City of Garden Ridge C5051 N454136363834362726213930283026263825291City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N443332343534332829233431302925314430331Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N473733303429292834243333322624243522281Heritage Middle School C622
CPS Pecan Valley C6781 N464735354132362533163836292924233723NA1CPS Pecan Valley C678
Government Canyon C16101 N545033415436291830233240333326243222241Government Canyon C1610
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C42342123273530182021313033342929301919212Corpus Christi West C4
Corpus Christi Tuloso C211352125243028171920272631292527261918201Corpus Christi Tuloso C21
Victoria C871473326383629232225363335372733423532351Victoria C87
Holly Road C6601 N342730333733232635363337383434362423291Holly Road C660
Violet C6641 N282623263527211925333134342731302219191Violet C664
Ingleside C6851 N281921252833161819292731322931291816201Ingleside C685
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP1431332926313026292525242928272628352123211Mission C43/AP143
Harlingen Teege C10231282530312525242625223033262829392221231Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2018POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441355140353437394032303838373933292131231Laredo 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.