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Daily Maximum Eight-Hour Ozone Averages for June 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 2021 in each community where the TCEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2305057513937464233343642805995872Ft. Worth Northwest C13/AH302
Keller C172NV4758493835434032343547724972822Keller C17
Frisco C31/C6801294254484440434438383867554757751Frisco C31/C680
Midlothian OFW C52/A1371325447433536423434343335555361691Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571284168554742435136404055564562771Denton Airport South C56/A163/X157
Arlington Municipal Airport C611305547453835413334333335656076701Arlington Municipal Airport C61
Dallas North No.2 C63/C6791284753454034363533323253594357821Dallas North No.2 C63/C679
Rockwall Heath C691263940373233313025242439504249651Rockwall Heath C69
Grapevine Fairway C70/A301/X1821234556443833353429313152574566811Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071131574540343435342324253145NV49541Kaufman C71/A304/X071
Granbury C73/C6811304145463533444032313232544777571Granbury C73/C681
Eagle Mountain Lake C75 131466454413749462826NANANANV74871Eagle Mountain Lake C75
Parker County C761334550513934464627292833564468581Parker County C76
Cleburne Airport C77/C6821334846434337454037373934555476651Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3295653NV4138403535343352746072873Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021315750423439453839363544705868751Dallas Executive Airport C402
Greenville C1006/A1981274144392735323221222446454049581Greenville C1006/A198
Pilot Point C10321304253NVNANANA5138464447514655721Pilot Point C1032
Italy C1044/A3231334843423932403130252632445253591Italy C1044/A323
Corsicana Airport C105113843NV373837393627282929464651181Corsicana Airport C1051
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Longview C19/A127/C6442333744313030363123192436414760622Longview C19/A127/C644
Tyler Airport Relocated C821384050482930363120181821374957661Tyler Airport Relocated C82
Karnack C85/AFHP3031243136282530303232262541284460401Karnack C85/AFHP303
AreaMonitoring SitePOCJune 2021POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252635754625349453949504663525455572El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591NV5150494947413447474757444348471Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1575346505349433847494757NVNANA451Chamizal C41/AH126
Socorro Hueco C49/F3121586059595953504361585857535558571Socorro Hueco C49/F312
Skyline Park C721606257595457484253525256474950531Skyline Park C72
Ivanhoe C414/F5141NV5653535353464051535351464951491Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG221155505053484640364445435446NANANA1Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Waco Mazanec C10371314537354333383230272636465053581Waco Mazanec C1037
Temple Georgia C10451354422374332402934313133435357621Temple Georgia C1045
Killeen Skylark Field C10471374521NV433840374041384045NV61621Killeen Skylark Field C1047
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2243329202324141414172128324758492Beaumont-Downtown C2/A112/C2002
West Orange C9/A141226282424232713171821233130NV51562West Orange C9/A141
Port Arthur West C28/A128/A2281272731242626161717182427336260611Port Arthur West C28/A128/A228
Hamshire C64/C6541213631252624151716202430325656NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N262329262827151716NVNANANANANV551SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541262421252626161818192122435956551SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N234434282732232323NVNANANANANV471SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431252833222426161616182328355867621SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1263130222627171817192328345265611Nederland High School C1035
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Austin North Hills Drive C3/A3222405133364440352933333137435556582Austin North Hills Drive C3/A322
Audubon C381314724283732241925262330324850571Audubon C38
Dripping Springs School C6141 N394733383937332932302934365658581Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N284323263834292529292837334750481CAPCOG Lake Georgetown C690
Lockhart C16041 N444333333632282125252530405448491Lockhart C1604
St. Edwards University C16051 N354028303031242125232227385046501St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N143127222723191418171821303433361CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N384128303331261925242429384749481CAPCOG Elgin C1613
CAPCOG East Austin C16191 N394530323535282428262530405248481CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N334523273733292732302731334445451CAPCOG Round Rock Brushy Creek W C1620
CAPCOG San Marcos Staples Road C16751 N384228313132281920232024315050491CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Houston East C1/G3162306025214030181820233050495074492Houston East C1/G316
Houston Aldine C8/AF108/X150 240NV37274434212424223560425161482Houston Aldine C8/AF108/X150
Channelview C15/AH115 3325935203528171817193142494866463Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542344134314632222426243133324553482Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391305735253627181919222836566170631Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4512445212025201515NV1621255256NV411Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1436030354531232627233348436378651Houston Bayland Park C53/A146
Conroe Relocated C78/A3211334437273842293638394734344248451Conroe Relocated C78/A321
Manvel Croix Park C841324524293526191920222429426261671Manvel Croix Park C84
Clinton C403/C304/AH113 3255127223727NVNANANV213945NV69523Clinton C403/C304/AH113
Houston North Wayside C405/C10331275728183829NV1919212751444564421Houston North Wayside C405/C1033
Houston Monroe C4061304223243325151716192331425468611Houston Monroe C406
Lang C4082NV28302245291923242336NVNANV70532Lang C408
Houston Croquet C4092375426303826172122202638416276742Houston Croquet C409
Houston Westhollow C410/C30031NANANANV301667NVNV162830NV6881Houston Westhollow C410/C3003
Park Place C416134552227382918201922NV45495878661Park Place C416
Houston Harvard Street C4171416321234231222324273254495979551Houston Harvard Street C417
Baytown Wetlands Center C5521 N255530202718131414151927455353501Baytown Wetlands Center C552
Crosby Library C5531 N325331213026172120243652394453411Crosby Library C553
West Houston C5541 N395634304433192223233139415478651West Houston C554
La Porte Sylvan Beach C5561 NNANV26223020141715172227556059461La Porte Sylvan Beach C556
Mercer Arboretum C5571 N325535244134202626304345334950441Mercer Arboretum C557
Tom Bass C5581 N344925283526181818212432446170691Tom Bass C558
Atascocita C5601 N314930223328162020243250313746371Atascocita C560
Meyer Park C5611 N3549342741312126272733393149NV451Meyer Park C561
Bunker Hill Village C5621 N355427254027192221203044406073541Bunker Hill Village C562
Huffman Wolf Road C5631 N324932263331212526314244343951411Huffman Wolf Road C563
Wallisville Road C617 1 N316142263428202322NVNANANANANV481Wallisville Road C617
Texas City 34th St. C620 1 N304130293123201819NVNANANANANV501Texas City 34th St. C620
UH Moody Tower C6951 N415927274128182019232846475780581UH Moody Tower C695
UH WG Jones Forest C6981 N3750NVNVNV4229343538423638NVNANA1UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 1275822213125171717202937475060501Lynchburg Ferry C1015/A165
Lake Jackson C1016 1282223273023181816181821365756551Lake Jackson C1016
Baytown Garth C10171336545293631232626273448516269561Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831NANV25283020181818212020367756551Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N294233293122181918222026526661461UH Smith Point C1606
Oyster Creek C1607 1 N3429333635302524NVNVNANANANANV551Oyster Creek C1607
UH Launch Trailer C16111 N406025244129182019232847485778571UH Launch Trailer C1611
AreaMonitoring SitePOCJune 2021POCMonitoring Site
San Antonio
San Antonio Northwest C232464633464234342828292734505863592San Antonio Northwest C23
Camp Bullis C58 1NANANV454837373131353341435761611Camp Bullis C58
Calaveras Lake C591433937333929282323222328384555521Calaveras Lake C59
Elm Creek Elementary C5011 N3839NV363728292322222026304869571Elm Creek Elementary C501
Fair Oaks Ranch C5021 N394733373833322927312838324752521Fair Oaks Ranch C502
Bulverde Elementary C5031 N455432344232302727313034324850531Bulverde Elementary C503
New Braunfels Airport C5041 N393526303328261922222026334749471New Braunfels Airport C504
City of Garden Ridge C5051 N474434353930282425232329355146531City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N383627283327261922221924324244461Seguin Outdoor Learning Center C506
Heritage Middle School C6221 NNV4038343830282322212228434857561Heritage Middle School C622
CPS Pecan Valley C6781 N353221283122211617171721353948441CPS Pecan Valley C678
Government Canyon C16101 N374133373427272222221826294749521Government Canyon C1610
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C42332727442723221917162024294360552Corpus Christi West C4
Corpus Christi Tuloso C211362926472823231817162024404361541Corpus Christi Tuloso C21
Victoria C871453530343727191716172025354059401Victoria C87
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP1431252934403931332017243330354246401Mission C43/AP143
Harlingen Teege C1023123NV30333028251816192929182539351Harlingen Teege C1023
AreaMonitoring SitePOCJune 2021POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441403133404540413529283335273648461Laredo Vidaurri C44/AFGP144/P244
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.