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Peak Daily One-Hour Ozone Averages for October 2020

The table below lists the peak daily one-hour ozone concentrations measured in October 2020 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 2020POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 245456544526571735760564860604345394015372Ft. Worth Northwest C13/AH302
Keller C17243436539536968715160574566544244373816342Keller C17
Frisco C31/C680142446942518469652860684467674242404318371Frisco C31/C680
Midlothian OFW C52/A137145416345465954534044564953583842364016331Midlothian OFW C52/A137
Denton Airport South C56/A163/X157142487240577677804456684467654545424316391Denton Airport South C56/A163/X157
Arlington Municipal Airport C61146446544496362594845564858614043394316351Arlington Municipal Airport C61
Dallas North No.2 C63/C679139446540507369663355624462613940394017361Dallas North No.2 C63/C679
Rockwall Heath C69139395436415955492556504251503838363516331Rockwall Heath C69
Grapevine Fairway C70/A301/X182141416438517069684561574462564142383915351Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071139354836345248402231444146533537383827361Kaufman C71/A304/X071
Granbury C73/C681151436043475560574941515056454546373520371Granbury C73/C681
Eagle Mountain Lake C75 145486642576577785159574869604747413916381Eagle Mountain Lake C75
Parker County C76145455941505761644448515060524749383920361Parker County C76
Cleburne Airport C77/C682151436147475659534639515053544340364018381Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 342396041436461573950574553553942374017313Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402150466647456764594259615160624246424116341Dallas Executive Airport C402
Greenville C1006/A198141375138395761472140534450594039333931351Greenville C1006/A198
Pilot Point C1032142427639518074632946734769714542434517401Pilot Point C1032
Italy C1044/A323147406645435961463541575852583842403618361Italy C1044/A323
Corsicana Airport C1051145436044436456363238504552563741444326381Corsicana Airport C1051
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Longview C19/A127/C644243414248427364312334424766574538323834372Longview C19/A127/C644
Tyler Airport Relocated C82144414342476564402231444764645240334336361Tyler Airport Relocated C82
Karnack C85/AFHP303138364333364256272238504143603638333937361Karnack C85/AFHP303
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125256585263526465675445424953445053484343472El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X159152514753536056794940384552404448564039431Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 147514653475353665042403753423942464139431Chamizal C41/AH126
Socorro Hueco C49/F312155475254666359706045454559475050704358621Socorro Hueco C49/F312
Skyline Park C72154634856555965615545424860464551544344471Skyline Park C72
Ivanhoe C414/F514154534852606759815646434554455048604444481Ivanhoe C414/F514
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Waco Mazanec C1037151466855486557433445606161584645434233501Waco Mazanec C1037
Temple Georgia C1045169486061536562513558645860705344414640391Temple Georgia C1045
Killeen Skylark Field C1047167496458496867563250595362545042364638391Killeen Skylark Field C1047
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 258455855624340202429394258644034424142362Beaumont-Downtown C2/A112/C2002
West Orange C9/A141253455353584844222727344851834233403739342West Orange C9/A141
Port Arthur West C28/A128/A2281624650576748462626NANANA31554034423941371Port Arthur West C28/A128/A228
Hamshire C64/C654156445260665049222836346567634032383640331Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541NANANANA4549341816NANANANANANANANANANANA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N584464595346381933NA4847461014839444144381SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643166495258684553252732355166584136424041361SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 159435153614246192729334556573933393841351Nederland High School C1035
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Audubon C38166585956657467602952575471545242364335371Audubon C38
Dripping Springs School C6141 N79625056646678542760585772545351354636371Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N73535660678364573355625663635744424739421CAPCOG Lake Georgetown C690
Lockhart C16041 N75545259596163343552465561414944434432381Lockhart C1604
St. Edwards University C16051 N64525150645562443253435066484840383931331St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N72525658596159403254505658534844444735401CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N65535457586259383253535756455043424333361CAPCOG Elgin C1613
CAPCOG East Austin C16191 N68584956746467463559495672525343434436381CAPCOG East Austin C1619
CAPCOG San Marcos Staples Road C16751 N67535055706269453262505862424944454434391CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N63474758526156443258505753505042414131341CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Houston East C1/G316266426069915347202454375277704022434038402Houston East C1/G316
Houston Aldine C8/AF108/X150 266538066666144232651464460755329424440532Houston Aldine C8/AF108/X150
Channelview C15/AH115 364404964705146232453365268653627353942363Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542584610253606256292738374458643631414137672Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239167485686736160272659374873683730454143401Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45174404858535254282059304350552925363338311Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1775463721037463273045364389543829413936491Houston Bayland Park C53/A146
Conroe Relocated C78/A321164437261515750242941474748874637465045451Conroe Relocated C78/A321
Manvel Croix Park C84182566199717776302843324180563127424034391Manvel Croix Park C84
Clinton C403/C304/AH113 3724857729660NA112448334285523928383832413Clinton C403/C304/AH113
Houston North Wayside C405161446460695740212242364258624126383733431Houston North Wayside C405
Houston Monroe C406168435285706151242247304275493024373532371Houston Monroe C406
Lang C408271547775846556282546424173655026404035552Lang C408
Houston Croquet C4092725059709069702824403739109543626413834442Houston Croquet C409
Houston Westhollow C410164495968836659312338293976503124353331431Houston Westhollow C410
Park Place C4161714756879165632624NANA44108604025424035451Park Place C416
Sheldon C5511 N61424861645043192450374751714326373536341Sheldon C551
Baytown Wetlands Center C5521 N6141466855504421NANA285449562726323435271Baytown Wetlands Center C552
Crosby Library C5531 N59385059494440172344424646814326353637351Crosby Library C553
West Houston C5541 N65526869806560292539334172543327363630521West Houston C554
La Porte Sylvan Beach C5561 N75465256545251292475274849603127383640361La Porte Sylvan Beach C556
Mercer Arboretum C5571 N59427054505144232336423449714725374042481Mercer Arboretum C557
Tom Bass C5581 N76475896776771252342303881543125414138441Tom Bass C558
Katy Park C5591 N61515961726766332838333869503031383632471Katy Park C559
Atascocita C5601 N564450564749351720373835NANANANANA3736371Atascocita C560
Meyer Park C5611 N614810863636253272638373859694729383833581Meyer Park C561
Bunker Hill Village C5621 N66506066846551262440313973513723333228471Bunker Hill Village C562
Huffman Wolf Road C5631 N62435265474843212842484443914731384344391Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N62425266845250242452344831664430362930401HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N68455267715249262859385770753633414142371Wallisville Road C617
Texas City 34th St. C620 1 N95485969606374303151324148614140484246401Texas City 34th St. C620
UH Moody Tower C6951 N74525872100695828265238NA96604126424236481UH Moody Tower C695
UH WG Jones Forest C6981 N66457461566555272944435051824935444743511UH WG Jones Forest C698
UH West Liberty C6991 N56384761464341202439474241864528343940331UH West Liberty C699
Lynchburg Ferry C1015/A165 160414961624844232251345459573128363539351Lynchburg Ferry C1015/A165
Lake Jackson C1016 169535566537263302836282948512632433836391Lake Jackson C1016
Baytown Garth C1017166445366695248273064415971783933414445371Baytown Garth C1017
Galveston 99th St. C1034/A320/X183179555363537145272845282347574034454944431Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N7647546054695927299129NANA633834424141361UH Smith Point C1606
Oyster Creek C1607 1 N77636376627761403453353454634840515146451Oyster Creek C1607
UH Launch Trailer C16111 N71495669100665525255038NA88304023414135441UH Launch Trailer C1611
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
San Antonio
San Antonio Northwest C23274705864667176682763514480404848384631362San Antonio Northwest C23
Camp Bullis C58 182836558808583753376625086495554405439421Camp Bullis C58
Calaveras Lake C59168585254686272653358466258374942454228391Calaveras Lake C59
Elm Creek Elementary C5011 N57584956555479642951444860334445353829311Elm Creek Elementary C501
Fair Oaks Ranch C5021 N64685545627160612460524257384644344333361Fair Oaks Ranch C502
Bulverde Elementary C5031 N67635743707066642568554167434644334633371Bulverde Elementary C503
New Braunfels Airport C5041 N59504949585557382757435151364137373731341New Braunfels Airport C504
City of Garden Ridge C5051 N69625256746667662567495167444644354227341City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N67574952645562323151465158384238434031361Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N63534655595269592753415450374539343825361Heritage Middle School C622
CPS Pecan Valley C6781 N61504351595865572449404657324138323323311CPS Pecan Valley C678
Government Canyon C16101 N73715256566670612556474377374445343832331Government Canyon C1610
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4264544555676662463538292735452230443732362Corpus Christi West C4
Corpus Christi Tuloso C21165574656686456473540323643422332493731371Corpus Christi Tuloso C21
Victoria C87160625552566157453350363851472930403828361Victoria C87
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP143154604448606056403047323838333026683325361Mission C43/AP143
Harlingen Teege C1023153634655586255363343363621342729503830381Harlingen Teege C1023
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P244156675144495166564859464137335243384127351Laredo 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.