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Peak Daily One-Hour Ozone Averages for October 2017

The table below lists the peak daily one-hour ozone concentrations measured in October 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 SitePOCOctober 2017POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26850404657605361413546544341394549572Ft. Worth Northwest C13/AH302
Keller C1726751425157665066443350584844404657642Keller C17
Frisco C31/C68017150324861654978493643715851384256611Frisco C31/C680
Midlothian OFW C52/A13716048344442545861423847504742414750601Midlothian OFW C52/A137
Denton Airport South C56/A163/X15717151445771584764433442614940384352621Denton Airport South C56/A163/X157
Arlington Municipal Airport C6116345314145545160403444544441374450591Arlington Municipal Airport C61
Dallas North No.2 C63/C67916548304557595177463448665449384454561Dallas North No.2 C63/C679
Rockwall Heath C69158442142495251764736415847473829NANA1Rockwall Heath C69
Grapevine Fairway C70/A301/X18216851385266635270453547625045394652601Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071161452149435159615141NANANANANA4356641Kaufman C71/A304/X071
Granbury C73/C68116251414644505255413653464643424949541Granbury C73/C681
Eagle Mountain Lake C75 17357485367595263423747594741424660611Eagle Mountain Lake C75
Parker County C7616355424348525059433750494542434652511Parker County C76
Cleburne Airport C77/C68217158424750625759513855534946434653561Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 35841243850514766333345534041374042583Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40216047284148535165413150524643364246561Dallas Executive Airport C402
Greenville C1006/A19815745204143475074473640605255394046571Greenville C1006/A198
Pilot Point C103216752395366724869523741675751384252661Pilot Point C1032
Italy C1044/A32316246255048596061424152494643424954621Italy C1044/A323
Corsicana Airport C105116946224752544863514148665857454553681Corsicana Airport C1051
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Longview C19/A127/C64426349254550505456473849685352424249662Longview C19/A127/C644
Tyler Airport Relocated C8215544226846495359383747585552434365571Tyler Airport Relocated C82
Karnack C85/AFHP30316145294553506371493937475451374144601Karnack C85/AFHP303
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X15124037683533365746403535725543495270462El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X15914135573128395445363642584242474957411Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 14538652832506050433944616044474956461Chamizal C41/AH126
Socorro Hueco C49/F31213635402720385943353436334748464547381Socorro Hueco C49/F312
Skyline Park C7214840603639445548443650706143485557531Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N4341353229275649373838303435485150503BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C41413733362320344538312931384335363639351Ivanhoe C414
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Waco Mazanec C103716950314850584965423951514642454648591Waco Mazanec C1037
Temple Georgia C104517156375356594664463659544449505559641Temple Georgia C1045
Killeen Skylark Field C104716250354853524457563552745253475456681Killeen Skylark Field C1047
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 26339355357623333303445635952334043672Beaumont-Downtown C2/A112/C2002
West Orange C9/A141255433954565434NA313240525755384146642West Orange C9/A141
Port Arthur West C28/A128/A22815241384145432636273542765243393945541Port Arthur West C28/A128/A228
Hamshire C64/C65416146384948533260283338695742324153641Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165415932404650432442313653575943474354531SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64315236364044422832263238595043353742531SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 15944404950513534313541615550373943621Nederland High School C1035
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Austin Northwest C3/A32226451324452514458423429573741455150632Austin Northwest C3/A322
Audubon C3816251324454574458453252584242434961701Audubon C38
Fayette County C6012 N7261255245554546383552473540435051712Fayette County C601
Dripping Springs School C6141 N5952284949564265463152613742424760691Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N5844214443374543343040493034394541531CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N6954334751574759523354725047465255741CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N6145284738373146302443422630333955621Gorzycki Middle School C1603
Lockhart C16041 N685028444847555140414955394222NA55671Lockhart C1604
St. Edwards University C16051 N5742263948394253353247462934404852561St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N6750233643454754393255573940394951651CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N5744274648444860403353573539455149601CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Houston East C1/G316295503053546434693832501126947403537852Houston East C1/G316
Houston Aldine C8/AF108/X150 289502249567231614242468690604044501122Houston Aldine C8/AF108/X150
Channelview C15/AH115 37445264549563172333745886042374141683Channelview C15/AH115
Northwest Harris Co. C26/A110/X15428752264947703747464347899365384753972Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23916946374549543875324052646243424143701Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4516742404744473689293848535542473747571Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1736533677071425029386410567524148541021Houston Bayland Park C53/A146
Conroe Relocated C78/A32116243294144513452634542515458384646721Conroe Relocated C78/A321
Manvel Croix Park C8417549374952556053334467696345515058871Manvel Croix Park C84
Clinton C403/C304/AH113 392563151566439512938551155947474345913Clinton C403/C304/AH113
Houston North Wayside C405183442745475836563133451077143363743931Houston North Wayside C405
Houston Monroe C40616143344343483951313653796844463741711Houston Monroe C406
Lang C4082934923515168364631335011076493338441032Lang C408
Houston Croquet C40926754295054564150293657846344414251892Houston Croquet C409
Houston Westhollow C410175663475707543493139609165513748591011Houston Westhollow C410
Park Place C416169543348556042543534491007448454044841Park Place C416
Baytown Wetlands Center C5521 N4833152731352059162432443221223235491Baytown Wetlands Center C552
Crosby Library C5531 N695023NANANANANANANANANANANANANANANA1Crosby Library C553
La Porte Sylvan Beach C5561 N6041344341463179303543565240393643561La Porte Sylvan Beach C556
Tom Bass C5581 N6041254143444142293343665438352931661Tom Bass C558
Katy Park C5591 N5854245853723037263239645335303849861Katy Park C559
Atascocita C5601 N8242154557692378413543597650334247981Atascocita C560
Meyer Park C5611 NNANANANA34422328262636526744263234761Meyer Park C561
Clear Brook High School C5701 N6740334245474445304062545745544451671Clear Brook High School C570
Clear Creek High School C5711 N6334283839413467234467494840564247561Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N8553305256643469363944966044414142801HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N6750315251653175343646725542374346641Wallisville Road C617
Danciger C618 1 N5641254144464442223259484234345159701Danciger C618
Texas City 34th St. C620 1 N7444445150514184444870696350595053711Texas City 34th St. C620
UH Moody Tower C6951 N80543254606946543437511207250444349291UH Moody Tower C695
U of H-Sugarland C6961 N6962343562604451353762715945394961281U of H-Sugarland C696
UH Coastal Center C6971 N6836403942462952294769536142614254211UH Coastal Center C697
UH WG Jones Forest C6981 N6644274243524052564346576563384747321UH WG Jones Forest C698
UH West Liberty C6991 N5543262249542666423446404339304038191UH West Liberty C699
Lynchburg Ferry C1015/A165 1NANANANANANANANANA2941574739313437621Lynchburg Ferry C1015/A165
Lake Jackson C1016 16440384445503746263166475239445376681Lake Jackson C1016
Baytown Garth C101716852335252673280363846735545384244631Baytown Garth C1017
Galveston 99th St. C1034/A320/X18317033404749533693444662616544514452601Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N6841404648503755373574535838525456671Oyster Creek C1607
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
San Antonio
San Antonio Northwest C2326760313749634751453251503741404464672San Antonio Northwest C23
Camp Bullis C58 17565314152744353493448584646414564731Camp Bullis C58
Calaveras Lake C5916957273442546058383649623939405150671Calaveras Lake C59
Elm Creek Elementary C5011 N5953283546504648383453433339394862611Elm Creek Elementary C501
Fair Oaks Ranch C5021 N7063293553733949503143444241404361671Fair Oaks Ranch C502
Bulverde Elementary C5031 N7056283552694154493345624643414652741Bulverde Elementary C503
New Braunfels Airport C5041 N6550233542494458413151533539374749631New Braunfels Airport C504
City of Garden Ridge C5051 N6354233545574465403350563237394652651City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N6850243645434350393247553838344947721Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N5850233037465349323047523432354450601Heritage Middle School C622
CPS Pecan Valley C6781 N615422293553514630274754303630NA53551CPS Pecan Valley C678
Government Canyon C16101 N6658343752544248423252393438384469611Government Canyon C1610
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C425544323436413946272838503837334554612Corpus Christi West C4
Corpus Christi Tuloso C2115546293335393949282736464033354449681Corpus Christi Tuloso C21
Victoria C8716550243845524456303253513838414847651Victoria C87
Inez C6091 N6553244045534161293444494141415250641Inez C609
Holly Road C6601 N53422933343637432220NANANANANANA53621Holly Road C660
Violet C6641 NNANA213841514550303143543436405053781Violet C664
Ingleside C6851 N5140283234363441322638373129333842541Ingleside C685
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14314737272927393941292223442633323846521Mission C43/AP143
Brownsville C80/AGP18014828212930334036262428362226294148471Brownsville C80/AGP180
Harlingen Teege C102314633223033344039332629392329324553451Harlingen Teege C1023
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24414730919NA283930302033422127313953481Laredo 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.