Skip to main content

Peak Daily One-Hour Ozone Averages for October 2021

The table below lists the peak daily one-hour ozone concentrations measured in October 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 SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 23146585662676962613854253732444452545544575735326130362Ft. Worth Northwest C13/AH302
Keller C1724144535356757062613855323430414354545548556134356930362Keller C17
Frisco C31/C680146515354556783776941573435384245495658NA547040375440401Frisco C31/C680
Midlothian OFW C52/A13713245595562726769563559403135444849545243575434344528351Midlothian OFW C52/A137
Denton Airport South C56/A163/X15714950525555597867654253343636434757576044526739365832351Denton Airport South C56/A163/X157
Arlington Municipal Airport C6113351585970816761583764383134434750525347595832325130351Arlington Municipal Airport C61
Dallas North No.2 C63/C67913149555354727570613959313535414250535543545833345137371Dallas North No.2 C63/C679
Rockwall Heath C6912939494847746461503855342931364143464741425133314331321Rockwall Heath C69
Grapevine Fairway C70/A301/X18213946515053727062613857293430414850485349525533315927361Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07112738585153696867554560372934404342444943475133354734391Kaufman C71/A304/X071
Granbury C73/C68114043505359545661564151313429404546555037595334334930351Granbury C73/C681
Eagle Mountain Lake C75 14447555356696867614653303534434554585542556534377134381Eagle Mountain Lake C75
Parker County C7614546525459606668644647433934414653565040535837396233381Parker County C76
Cleburne Airport C77/C68213439536074696664593451383331394846575239605335314527351Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 32741534953716360543454283129394147424635555128305430323Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40213342595557776666543663283033444447475349475632345132361Dallas Executive Airport C402
Greenville C1006/A19812742515352647369625552322834394447505547515034364731401Greenville C1006/A198
Pilot Point C103214456525255619177764254373837454859626446497042395037371Pilot Point C1032
Italy C1044/A32313542626160617072553556233033455245525346535131344030361Italy C1044/A323
Corsicana Airport C105113739675859687673594159372936484645455648495335395142421Corsicana Airport C1051
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Tyler-Longview-Marshall
Longview C19/A127/C64422644605450616762583855253828494650505548506034366740452Longview C19/A127/C644
Tyler Airport Relocated C82130435554NA566867654158343832504651485345556939374731451Tyler Airport Relocated C82
Karnack C85/AFHP30312542564844547066634248333529424342556652475833394850401Karnack C85/AFHP303
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
El Paso-Juarez
El Paso UTEP C12/A125/X151/G12525658616655663337345045474759475151364043436739375246432El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X15914955525148553052294840434849444543303242415134344843411Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15656545645623241345139464559454345354141425839384645431Chamizal C41/AH126
Socorro Hueco C49/F31217462595353534150355247456059475250404256505240415144421Socorro Hueco C49/F312
Skyline Park C7215453555453513433355048495161505045384442417042385746431Skyline Park C72
Ivanhoe C414/F5141585554545461385835494244NANANANANANANANANANANANANANANA1Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG22115356605558553632345048464958475049364044426739384244421Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Waco
Waco Mazanec C103713341576557667376543552252730455243605149505233354729371Waco Mazanec C1037
Temple Georgia C104513741576268657579623855303129435250645150525234414429401Temple Georgia C1045
Killeen Skylark Field C104714344566170708890764360283435445552705746525542445534441Killeen Skylark Field C1047
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 22235375445465887504349323230374040564641465431343432332Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123029314840425565514355343428363838515139474032333037342West Orange C9/A141
Port Arthur West C28/A128/A22813032435841507073514241353631354048474640404333355334401Port Arthur West C28/A128/A228
Hamshire C64/C65412733355544466878484041273330384449594842543534343528431Hamshire C64/C654
SETRPC Port Arthur C6281 N333447624553726754494437393536435450494546433538NANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165413534636342555867494938373832324051464839393833343433401SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N273338554548557063454936373446434162544842523537NANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64312631415741476979484145333429323942494439414329315230371SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 12533415642455680NANA46353532324040494744484733354934NA1Nederland High School C1035
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Austin
Austin North Hills Drive C3/A32224945515759756979583853363027424751615142556434364528422Austin North Hills Drive C3/A322
Audubon C3814139455354726872542851312221374451624938495636334325411Audubon C38
Dripping Springs School C6141 N4836485960727381583165252328445261574836525833344328431Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N3540505456807786643449212931374446615239495035384727381CAPCOG Lake Georgetown C690
Lockhart C16041 N3331536871617072532048292128415048585242525732323224451Lockhart C1604
CAPCOG Bastrop CAMS16121 N3333495354586566522440332426364143564642495729282620401CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N3235555764616370533347342826374747614745475332312726441CAPCOG Elgin C1613
CAPCOG East Austin C16191 N4843525761736573573549242625404749595150576133344126421CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N4243515657767385623450253027384647615148515934374229391CAPCOG Round Rock Brushy Creek W C1620
CAPCOG San Marcos Staples Road C16751 N3939566359706979592649222628415053585546646338363531451CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Houston-Galveston-Brazoria
Houston East C1/G3162193638464963821085536117233327443646585041516832365726422Houston East C1/G316
Houston Aldine C8/AF108/X150 228484056566591130NANA7327392747NANA2068623974NANA69NA542Houston Aldine C8/AF108/X150
Channelview C15/AH115 323313748435870105523669223025404141534539367229385624453Channelview C15/AH115
Northwest Harris Co. C26/A110/X15422340415251526790583047253124383741787166496933344129422Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23912538475551759977533792303230424252524940607433366729451Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45121344955457310261423362232626343850464433395829303322421Seabrook Friendship Park C45
Houston Bayland Park C53/A146 123374861679011276543382263525414560675852635930336026461Houston Bayland Park C53/A146
Conroe Relocated C78/A321129414855555676100824052394629444445657345385543544741461Conroe Relocated C78/A321
Manvel Croix Park C84123355267689910468553281223223414653585246785330303925491Manvel Croix Park C84
Clinton C403/C304/AH113 322313951527085844730101172722353946544339564628325519333Clinton C403/C304/AH113
Houston North Wayside C405/C1033117363645506073103533051203122343839604943455127415322381Houston North Wayside C405/C1033
Houston Monroe C406120314454487310173463179262923333546444428634927284620331Houston Monroe C406
Lang C40821941414957728987543366233224373744695653486327375825442Lang C408
Houston Croquet C409223334658669110468513284233324394261595448665331305224432Houston Croquet C409
Houston Westhollow C410/C3003120NANA4953658062502768192420353745655251575026275120401Houston Westhollow C410/C3003
Park Place C41612234455657819886543493213025374156585243675030315823421Park Place C416
Houston Harvard Street C417122444959658510395673681243228394347735853586532366127431Houston Harvard Street C417
Sheldon C5511 N22303344435162109513059192821383937564540387124374922411Sheldon C551
Baytown Wetlands Center C5521 N1930334642568655443463272725303845444230375827335221401Baytown Wetlands Center C552
Crosby Library C5531 N2027284341485894573266223122403939614736378328375021311Crosby Library C553
West Houston C5541 N1949425758688481582878223025414452826364606032345825461West Houston C554
La Porte Sylvan Beach C5561 N24314246425797604337682827274024323433202844171810NA401La Porte Sylvan Beach C556
Tom Bass C5581 N25304760619111280523183212823374154555141805128294325441Tom Bass C558
Katy Park C5591 N2043415253606765473155182523373948745464535130274323421Katy Park C559
Atascocita C5601 N23402840434962118583155243021313736645141337427434324381Atascocita C560
Meyer Park C5611 N20383847555572985829632534213339417859564172306814927411Meyer Park C561
Bunker Hill Village C5621 N1639405359799373482970233121384145655251515626315624421Bunker Hill Village C562
Huffman Wolf Road C5631 N2435334644506094643646273424444039584943327732424127401Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N2333405152668810458349123322846414951534560652838NANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N283738524754727756417526363355454758514153743640NANANA1Wallisville Road C617
Texas City 34th St. C620 1 N3436648053931059155475731403640505556524664693837NANANA1Texas City 34th St. C620
UH Moody Tower C6951 N2035455752799083563289223024374052615248625330325924441UH Moody Tower C695
UH WG Jones Forest C6981 N2539475261587599723647324026414242657393406737494836431UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 1282833383946797851359026312743334347NANA10462123NANANA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 12432506975646379523756233130345452555245545331282326451Lake Jackson C1016
Baytown Garth C101713241415448547379594468314235584445575242467638427129471Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831333568774581777656445231383438NANA504642515335352428441Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N31365155446496785143562935333836NANA4743405936NANANANA1UH Smith Point C1606
Oyster Creek C1607 1 N333761776573706956445931363637535256534858593738NANANA1Oyster Creek C1607
UH Launch Trailer C16111 N2137465657809484583487223125404152635148615531346223461UH Launch Trailer C1611
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
San Antonio
San Antonio Northwest C2323655445160736275503750252654384354614851516435314630422San Antonio Northwest C23
Camp Bullis C58 14347506162977691633959312958454856695654466639375634471Camp Bullis C58
Calaveras Lake C5913839576371686576512553252739495249605346586337324129461Calaveras Lake C59
Elm Creek Elementary C5011 N3952586069696072502553222341424552554735546532273527421Elm Creek Elementary C501
Fair Oaks Ranch C5021 N3329344448896678563551252451404149665047416337335432441Fair Oaks Ranch C502
Bulverde Elementary C5031 N3537435453837281573354292845434249575045375835314728401Bulverde Elementary C503
New Braunfels Airport C5041 N2628404747615261461737201923323841464134474726262723361New Braunfels Airport C504
City of Garden Ridge C5051 N3139445353796775502546262223334147524640434627253123371City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N3437516155636270532446262529404746534937535833312826381Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N3439515963585871452542222133414644544840525933284027431Heritage Middle School C622
CPS Pecan Valley C6781 N2533333947524556351537141724303237423531334022192319321CPS Pecan Valley C678
Government Canyon C16101 N3941405060745973503248202243333952574544436530254026381Government Canyon C1610
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Corpus Christi-Victoria
Corpus Christi West C423233395764707057442836162130364152484444434034282422442Corpus Christi West C4
Corpus Christi Tuloso C2113130395563847173452136172031344352494445434433242622441Corpus Christi Tuloso C21
Victoria C8713630416055627366512247172332404545564851474731293821461Victoria C87
AreaMonitoring SitePOCOctober 2021POCMonitoring Site
123456789101112131415161718192021222324252627
Lower Rio Grande Valley
Mission C43/AP14313749274560747162442633242141404453584139413332303126431Mission C43/AP143
Harlingen Teege C102312729205262625448472126222123374450494741333137303225451Harlingen Teege C1023
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.